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Contaminated House Dust Linked to Parking Lots With Coal Tar Sealant

February 17, 2010

Coal-tar-based sealcoat — the black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds — has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons (PAHs) in house dust. Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs than apartments next to other types of parking lots, according to new research published online in Environmental Science and Technology (ES&T).

The study was conducted in Austin, Texas, by scientists at the U.S. Geological Survey (USGS).

Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight. Coal-tar-based pavement sealants therefore have very high levels of PAHs compared to other PAH sources (e.g., soot, vehicle emissions, used motor oil). PAHs are an environmental health issue because several are probable human carcinogens and they are toxic to fish and other aquatic life.

Small particles of sealcoat, which contains extremely high concentrations of PAHs, likely are tracked indoors by residents after they walk across the parking lot. The study found that apartments adjacent to coal-tar-sealcoated parking lots contained concentrations of PAHs in house dust with that were 25 times higher than in house dust from apartments with concrete, asphalt, or asphalt-based sealcoat parking lot surfaces. The study also found that dust directly on the coal-tar-sealcoated parking lots had PAH concentrations that were 530 times higher than in dust on the parking lots without coal-tar sealcoat.

“These findings represent a breakthrough in our understanding of one of the important sources of these contaminants in house dust and how these contaminants can move from outdoors to indoors. The study provides evidence that will be potentially useful for policy makers,” said Bob Joseph, Director of the USGS Texas Water Science Center.

In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming. Researchers have had little success, however, demonstrating a relation between any of those factors and PAH concentrations.

Sealcoat products are widely used in the U.S., both commercially and by homeowners on their driveways. The products are commonly applied to parking lots of commercial businesses (including strip malls and shopping centers); apartment and condominium complexes; churches, schools, and business parks; residential driveways; and playgrounds. The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city. The sealcoat wears off of the surface relatively rapidly, especially in areas of high traffic, and manufacturers recommend resealing every three to five years.

Two kinds of sealcoat products are widely used: coal-tar-emulsion based products and asphalt-emulsion based products. National use numbers are not available; however, previous research suggests that asphalt-based sealcoat is more commonly used on the West Coast, and coal-tar based sealcoat is more commonly used in the Midwest, the South, and on the East Coast.

Previous research by the same group of USGS scientists, published earlier in 2009, demonstrated that dust from sealcoated parking lots in cities east of the Continental Divide had concentrations of PAHs that were about 1,000 times higher than in dust from sealcoated parking lots in cities west of the Continental Divide.

Comments

75 Responses to “Contaminated House Dust Linked to Parking Lots With Coal Tar Sealant”

  1. TARRELL CLEMONS 1ST PERIOD 2-17-10 on February 17th, 2010 8:56 pm

    1) Coal-tar-based sealcoat — the black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds — has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons (PAHs) in house dust.

    2) Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs than apartments next to other types of parking lots, according to new research published online in Environmental Science and Technology (ES&T).

    3) Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.

    4) Coal-tar-based pavement sealants therefore have very high levels of PAHs compared to other PAH sources (e.g., soot, vehicle emissions, used motor oil).

    5) “These findings represent a breakthrough in our understanding of one of the important sources of these contaminants in house dust and how these contaminants can move from outdoors to indoors.In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming.

  2. gabrielle covey 5 period on February 17th, 2010 10:12 pm

    1. This article is about contaminated house dust linked to parking lots with coal tar sealant.
    2. Coal-tar is a black shinny substance.
    3. Coal tar is a byproduct of the coking of coal.
    4. CArcinogens are toxic to fish and othe rwater animals.
    5. Small particles of sealcoat contain extremely high concentrations of PAHs.

  3. Joey Kavanagh on February 19th, 2010 8:10 pm

    1. Black shiny substance painted over most parking lots is seal coat.
    2. Seal coat has been linked to high consentration of PAHs.
    3. PAHs have been found in common house dust.
    4. Coal tar is the byproduct of cooking of coal.
    5. These findings have a break through our research.

  4. andrew rice on February 20th, 2010 12:30 pm

    Andrew Rice
    1, coal based tar has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons (PAHs) in house dust.
    2.

  5. Celia Farrell 1st Period on February 22nd, 2010 10:36 am

    1. Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.

    2. Small particles of sealcoat are likely tracked indoors by residents after they walk across the parking lot.

    3. In the past, several factors have been thought to affect PAH concentrations in house dust including tobacco smoking and frequency of vacuming.

    4. Sealcoat products are widely used in the U.S.

    5. The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  6. Lamonte' Turner on February 22nd, 2010 6:49 pm

    1. Coal-tar-based sealcoat the black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons(PAHs) in house dust.
    2) Apartments with adjacent parking lots treated with the coal-tar based sealcoat c.ntained house dust with much higher concentrations of PAHs than apartments next to other types of parking lots, according to new research published online in Environmental Science and Technology (ES&T).
    3.Coal tar is a byproduct of the cooking of coal, and can contain 50 percent or more PAHs by weight.
    4. Coal-tar-based pavement sealants therefore have very high levels of PAHs compared to other PAH sources (e.g., soot, vehicle emissions, used motor oil).
    5. “These findings represent a breakthrough in our understanding of one of the important sources of these contaminants in house dust and how these contaminants can move from outdoors to indoors.In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming

  7. alex 4th period on February 22nd, 2010 7:39 pm

    1 Tar has been linked to contaminants.

    2 This includes the water that we drink.

    3 The study was done in Austin, Texas.

    4 Tar is a product of the coking of coal, and contains about 50 percent or more PAHs by weight.

    5 It is toxic to fish and other wildlife.

  8. natalie seavers 6th on February 22nd, 2010 8:09 pm

    The study was conducted in Austin, Texas, by scientists at the U.S. Geological Survey

    Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight

    In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming

    Sealcoat products are widely used in the U.S., both commercially and by homeowners on their driveways

    Two kinds of sealcoat products are widely used: coal-tar-emulsion based products and asphalt-emulsion based products. National use numbers are not available

  9. Dylan Clark 4th period on February 22nd, 2010 10:28 pm

    1) Coal-tar-based sealcoat — the black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds — has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons (PAHs) in house dust
    2) Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs than apartments next to other types of parking lots, according to new research published online in Environmental Science and Technology
    3 The study was conducted in Austin, Texas, by scientists at the U.S. Geological Survey
    4) Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.

    5)Coal-tar-based pavement sealants therefore have very high levels of PAHs compared to other PAH sources

  10. Savannah Watson 1st on February 22nd, 2010 10:45 pm

    1. Coal tar seal has been linked to concentrations of the contaminants polycyclic aromatic hydrocarbons dust.

    2. coal tar is the byproduct of the coking oil.

    3. 2 kinds of sealcoat products are mostley used: coal-tar-emulsion and asphalt-emulsion.

    4. smal sealcoat particals are tracked in by the residents of the apartment building.

    5. 660,000 gallons of sealcoat were estimaded to be used last year in Austin Texas

  11. Julia Harrelson 5th Period on February 28th, 2010 2:00 pm

    1. Contominated house dust is linked to parking lots with coal for sealant.
    2. Coal-tar-based sealcoat is the black paint that is sprayed in parkng lots,driveways & even playgrounds.
    3. This study was in Austin, Texas.
    4. The scientist that performed this interesting study are from the U.S. Geological Survey (USGS).
    5. PAHS are environmental health issue becuase several are probable human carcinogens.

  12. Ruhi- 2nd period on February 28th, 2010 9:07 pm

    Article summary
    1. Coal tar based sealcoat is the black, shiny substance sprayed or painted on parking lots, driveways, and playgrounds.
    2. It contaminants PAHs in house dust.
    3.Small particles of sealcoat are mostly tracked indoors by people after they walk across the parking lot.
    4. Sealcoat products are used a lot in the U.S.
    5.In Texas, before the ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  13. elijah Hurskin 4th period on February 28th, 2010 10:06 pm

    1)Coal-tar-based sealcoat — the black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds — has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons (PAHs) in house dust.
    2)Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs than apartments next to other types of parking lots
    3)this research has been done by the Environmental Science and Technology (ES&T).
    4)Coal tar is a byproduct of the coking of coal
    5) PAHs are an environmental health issue

  14. Ebone' Yarbrough--5th period on March 1st, 2010 9:55 am

    Black shiny substance painted over most parking lots is seal coat. Seal coat has been linked to high consentration of PAHs. 660,000 gallons of sealcoat were estimaded to be used last year in Austin Texas. Two kinds of sealcoat products are widely used: coal-tar-emulsion based products and asphalt-emulsion based products. Coal tar is the byproduct of the coking oil.

  15. Drake Horner 1st on March 1st, 2010 2:22 pm

    1)This article is about contaminated house dust linked to parking lots with coal tar sealant.
    2)2 kinds of sealcoat products are mostley used coal-tar emulsion and asphalt-emulsion.
    3)Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    4)The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.
    5)Small particles of sealcoat contain extremely high concentrations of PAHs.

  16. Rachel whorton 2nd on March 1st, 2010 5:38 pm

    1) Shiny black substances painted on parking lots, playgrounds, and drive ways is seal coat.
    2) small particles of seal coat have PAH
    3)PAH as been found in commom house dust
    4)Coal tar is the byproduct of cooking oil
    5)Caciogens are poisionis to fish

  17. Noah Milchuck - 5th period on March 1st, 2010 5:46 pm

    1. Tar has been linked to contaminants.

    2. Coal tar is a byproduct of the coking of coal.

    3. Black shiny substance painted over most parking lots is seal coat.

    4. PAHs have been found in common house dust.

    5. The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  18. Caroline Whorton 6th on March 1st, 2010 5:48 pm

    1. Coal-tar is the paint sprayed on many driveways or playgrounds.
    2. Coal tar can hold 50 percent PAHs weight.
    3. Sealcoat products are used in the U.S. a lot.
    4. Sealcoat products are used on parking lots.
    5. PAH concentrations affect house dust.

  19. Kris L. 2nd period on March 1st, 2010 5:58 pm

    1. Coal-tar-based sealcoat has been linked to elevated concentrations of PAHs.
    2. Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs.
    3. The study was conducted in Austin, Texas, by scientists at the U.S. Geological Survey.
    4.Coal tar is a byproduct of the coking of coal.
    5.In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming.

  20. Brandon Archer 5th period on March 1st, 2010 6:12 pm

    Coal-tar-based seal-coat has been linked to highly elevated contaminant polycyclic aromatic hydrocarbons.

    More dust particles are tracked in by house residents from the parking lot or driveway outside.

    This was studied by scientists at (USGS).

    Coal tar is another version product of the coking of coal.

    These findings represent a breakthrough in were all sorts of dust comes from.

  21. Takara Alexander 5th pd on March 1st, 2010 6:31 pm

    1.coal tar is the byproduct of the coking oil.
    2.The study was conducted in Austin,texas.
    3.PAHS are toxic to fish and other aquatic life.
    4.Two kinds of sealcoat products:coal-tar-emulsion based products and asphalt-emulsion
    5.about 660,000 gallons of sealcoat was applied every year in the city.

  22. Lamonte' Turner on March 1st, 2010 7:04 pm

    1. This article is about contaminated house dust linked to parking lots with coal tar sealant.
    2. Coal-tar is a black shinny substance.
    3. Coal tar is a byproduct of the coking of coal.
    4. CArcinogens are toxic to fish and othe rwater animals.
    5. Small particles of sealcoat contain extremely high concentrations of PAHs.

  23. Sam Neighbors 2nd on March 1st, 2010 7:18 pm

    1)Coal tar is a bi Product of cooking cool.

    2)Coal tar leads to more house dust.

    3) PAHs are an environmental are a health issue.

    4)PAH are toxic to fish and other aquatic life.

    5)Sealcoat products are widely used in the U.S.

  24. John Parvin McBride 2nd Period on March 1st, 2010 9:08 pm

    1.) Coal-tar-based sealcoat has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons.
    2.)Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs
    3.) Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weigh.
    4.) Coal-tar-based pavement sealants therefore have very high levels of PAHs compared to other PAH sources.
    5.) PAHs are an environmental health issus because several are probable human carcinogens and they are toxic to fish and other aquatic life.

  25. Devin Platts 1st on March 1st, 2010 10:05 pm

    1.Tar has been linked to contaminants.

    2.Seal coat has been linked to high consentration of PAHs.

    3. Coal tar is a byproduct of the coking of coal.

    4. The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city

    5. Black shiny substance painted over most parking lots is seal coat.

  26. Robert Mcclintock-2nd on March 1st, 2010 10:32 pm

    1. The black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds has been linked to elevated concentrations of the contaminants.
    2. The coal tar is a byproduct of the coking of coal.
    3. It also can contain 50 percent or more PAHs by weight.
    4. Sealcoat products are widely used in the U.S., espeacially and by homeowners for their driveways.
    5. There are two kinds of sealcoat products usually used is coal-tar-emulsion and asphalt-emulsion.

  27. Madeline Holifield 4th on March 4th, 2010 9:45 pm

    1.Coal-tar-based sealcoat has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons (PAHs) in house dust.
    2.Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    3.In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming.
    4.Two kinds of sealcoat products are widely used: coal-tar-emulsion based products and asphalt-emulsion based products.
    5.The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  28. Kathryn Wilson 4th on March 7th, 2010 7:00 pm

    1. Coal-tar is a black shinny substance.
    2. Coal tar is a byproduct of the coking of coal.
    3. Coal tar can contain 50 percent or more PAHs by weight.
    4. Coal-tar-emulsion based products and asphalt-emulsion based products are two kinds of sealcoat products.
    5. The City of Austin, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  29. Ta'Naisha 5th on March 8th, 2010 9:05 am

    1.) Black shiny substance painted over most parking lots is seal coat.
    2.)The study was conducted in Austin,texas.
    3.)Sealcoat products are widely used in the U.S.
    4.)PAHs have been found in common house dust.
    5.) Small particles of sealcoat contain extremely high concentrations of PAHs.

  30. Jenna Marshall 1st period on March 8th, 2010 9:37 am

    1) Coal-tar-based sealcoat, has been linked to contaminants in house dust.

    2) Apartments with parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations than apartments next to other types of parking lots..

    3) Coal tar is a byproduct of the cooking of coal.

    4) Coal-tar-based pavement sealants therefore have very high levels of PAHs.

    5)The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  31. keenan drake 2nd on March 8th, 2010 12:40 pm

    1.USGS conduct this project.
    2.the study was in austin texas
    3.tar is a byproduct of the coking of coal
    4.pah’s have been found in common house dust
    5.parking lots have tons of pah’s

  32. logan knox 2nd on March 8th, 2010 2:42 pm

    the black shiny substance sprayed or painted on many parking lots, driveways, and playgrounds has been linked to house dust.

    Coal tar is a byproduct of the coking of coal.

    Sealcoat products are used in the U.S. a lot.

    smal sealcoat particals are tracked in by the residents of the apartment building.

    The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  33. John Baudendistel - 4th on March 8th, 2010 3:49 pm

    1. Coal tar seal has been linked to concentrations of the contaminants polycyclic aromatic hydrocarbons dust.

    2. coal tar is the byproduct of the coking oil.

    3. 2 kinds of sealcoat products are mostley used: coal-tar-emulsion and asphalt-emulsion.

    4. smal sealcoat particals are tracked in by the residents of the apartment building.

    5. 660,000 gallons of sealcoat were estimaded to be used last year in Austin Texas

  34. Connor Ferguson 1 period on March 8th, 2010 5:50 pm

    1.coal-tar-based sealent has been linked to contanimants in house dust.
    2.Coal tar is a byproduct from the coking of coal.
    3.Coal tar has a very high level of PAHs.
    4.The sealcoat product is mainly applied to parking lots of businesses.
    5.It usually wears off quickly espicially in high areas of traffic and has to be resealed every 3 to 5 years.

  35. Lena Carter 1st period on March 8th, 2010 7:39 pm

    1. Contominated house dust is linked to parking lots with coal for sealant.
    2. Coal-tar-based sealcoat is the black paint that is sprayed in parkng lots.
    3. The scientist that performed this interesting study are from the U.S. Geological Survey .
    4. The study was in Austin, Texas.
    5. PAHS are environmental health issues.

  36. Courtney Terry-4th on March 8th, 2010 8:32 pm

    1. Coal-tar is a black shinny substance.
    2. Tar has been linked to contaminants.
    3. PAH concentration affects house dust.
    4. Conciogens are poisions to fish.
    5. it is toxic to fish and other wild life.

  37. Logan Storey 6th period on March 8th, 2010 8:47 pm

    Coal-tar-based sealcoat — the black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds.
    Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    PAHs are an environmental health issue because several are probable human carcinogens and they are toxic to fish and other aquatic life.
    In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming.
    Two kinds of sealcoat products are widely used: coal-tar-emulsion based products and asphalt-emulsion based products.

  38. Kaylee Thom 4th on March 8th, 2010 10:31 pm

    1. Contaminated house dust linked to parking lots with coal tar sealant.
    2. Coal-tar is a black shinny substance.
    3. Coal tar is a byproduct of the coking of coal.
    4. Carcinogens are toxic to fish and othe rwater animals.
    5. Small particles of sealcoat contain extremely high concentrations of PAHs.

  39. Devin Platts 1st on March 8th, 2010 10:42 pm

    1.Coal tar is a byproduct of the coking of coal.

    2.Black shiny substance painted over most parking lots is seal coat.

    3.It is toxic to fish and other wildlife

    4.PAH are toxic to fish and other aquatic life.

    5.Coal tar can hold 50 percent PAHs weight.

  40. joshua sanchez-6 on March 9th, 2010 8:11 am

    1. Tar has been linked to conserations.
    2. Coal-tar sealcoat is in house dust.
    3. The study was conducted at Texas
    4. Coal has very high PAHs.
    5. it is toxic to aquatic life.

  41. James Russell 6th on March 9th, 2010 8:39 am

    1 Tar has been connected to contaminants.

    2 Tar is in the water that we drink.

    3 The study was done in Austin, Texas.

    4 Tar is a product of the coking coal.

    5Tar is toxic to fish and other wildlife.

  42. Brett Baird 4th on March 9th, 2010 5:03 pm

    -coal tar is a byproduct of the coking of coal
    -coal tar can contain 50% or more PAHs by weight
    -apartments with parking lots treated with the coaltar based sealcout contained house dust with higher consentrations of PAHs
    -Two kinds of seal coat products are wildley used
    - these are coal tar emulision based products and asphalt emulsion based products

  43. Maysie Spears 4th period on March 11th, 2010 11:00 pm

    1. Coal-tar-based seal coat has been linked to elevated concentrations of the contaminates polycyclic aromatic hydrocarbons in house dust.
    2. Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    3. Small particles of sealcoat are tracked indoors by residents after they walk across the parking lot.
    4. Studies found that apartments adjacent to coal-tar-sealcoated parking lots contained concentrations of PAHs in house dust with that were 25 times higher than in house dust from apartments with concrete, asphalt, or asphalt-based sealcoat parking lot surfaces.
    5. Sealcoat products are often used in the U.S.

  44. Lena Carter 1st period on March 15th, 2010 7:00 pm

    1. Coal-tar is the black shinny substance that is sparayed on parking lots..
    2. Contominated house dust is linked to parking lots with coal for sealant.
    3. The scientist in Austin, Texas, that performed this interesting study are from the U.S. Geological Survey .,
    4. Conciogens are poisions to fish.
    5. It is poisonous to fish and wild life.

  45. Raine Aslan - 4th period on March 15th, 2010 7:43 pm

    1. Coal-tar-based sealcoat has been linked to contaminants in house dust.
    2. Apartments with parking lots treated with the sealcoat contained house dust with much higher concentrations of PAHs than apartments with other types of parking lots.
    3. Small sealcoat particles are tracked in by the residents of the apartment building.
    4. Two kinds of sealcoat products are widely used: coal-tar-emulsion based products and asphalt-emulsion based products.
    5. Sealcoat products are widely used in the U.S.

  46. Elizabeth Sanders 1st period on March 22nd, 2010 3:58 pm

    1.) Two kinds of seal coat products are wildley used.
    2.) Tar has been linked to contaminants.
    3.) It is toxic to fish and other wildlife.
    4.) This study was in Austin, Texas.
    5.) This was studied by scientists at (USGS).

  47. Logan Storey 6th period on March 22nd, 2010 5:36 pm

    Coal-tar-based sealcoat — the black, shiny substance sprayed or painted on many parking lots, driveways, and playgrounds.
    Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    PAHs are an environmental health issue because several are probable human carcinogens and they are toxic to fish and other aquatic life.
    In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming.
    Small particles of sealcoat likely are tracked indoors by residents after they walk across the parking lot.

  48. Chase Lovell 5th on March 23rd, 2010 7:02 pm

    1.Tar has been linked to contaminants
    2.Tar is in the water that we drink.
    3.Tar is toxic to fish and other wildlife
    4.The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.
    5.There are two kinds of sealed coats,coal-tar-emulsion based products and asphalt-emulsion based products.

  49. Austinh5th per on March 23rd, 2010 9:57 pm

    Two kinds of Seal coats products are widly used

    Coal tar based sealcoat is the black, shiny substance sprayed or painted on parking lots driveways and playgrounds

    The students that preformed this study are from Austin Texas

    Apartments with parking lots treated with the sealcoat contained house dust with much higher concentrations of PAHs than apartments with other types of parking lots

  50. Tara Harville 1st per. on March 26th, 2010 4:26 pm

    House dust has elevated concentrations of contiminants polycyclicaromatic hydrocarbons.

    Sealcoat contains extremely high measures of polycyclicaromatic hydrocarbons.

    Sealcoat products are widely used in the U.S., both commercially and by homeowners on their driveways.

    Sealcoat is commonly used to fill in parking lots.

    Two kinds of sealcoat products are widely used: coal-tar-emulsion based products and asphalt-emulsion based products
    The two types of sealcoats are coal-tar-emulsoin and asfalt products.

  51. austin 6per hoffman on March 28th, 2010 6:16 pm

    1 Two kinds of Seal coats products are widly used.

    2 Coal tar based sealcoat is the black, shiny substance sprayed or painted on parking lots driveways and playgrounds.

    3 The students that preformed this study are from Austin Texas.

    4 Apartments with parking lots treated with the sealcoat contained house dust with much higher concentrations of PAHs than apartments with other types of parking lots.

  52. John Baudendistel - 4th Period on March 29th, 2010 11:41 am

    1. Tar is used on roads, and parking lots.
    2. Coal tar is a biproduct of coking coal.
    3. The scientists that performed this experiment are from austin texas.
    4. Tar is toxic to fish.
    5. I learned a lot.

  53. John Baudendistel - 4th on March 29th, 2010 3:20 pm

    Small particles of sealcoat, which contains extremely high concentrations of PAHs, likely are tracked indoors by residents after they walk across the parking lot.

    Apartments with parking lots treated with the sealcoat contained house dust with much higher concentrations of PAHs than apartments with other types of parking lots.

    The students that preformed this study are from Austin Texas

    There are two kinds of sealed coats,coal-tar-emulsion based products and asphalt-emulsion based products.

  54. Allison Dreisewerd ~ 4th on March 29th, 2010 3:39 pm

    1. Coal-tar is a black shinny substance.
    2. The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.
    3. Coal tar is a byproduct of the coking of coal.
    4.Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    5. Coal tar it is toxic to fish and other wild life.

  55. Cassidy McCarter-4th on March 29th, 2010 3:56 pm

    1.) Coal-tar-based sealcoatis the black, shiny subs.tance sprayed or painted on many parking lots, driveways, and playgrounds.

    2.) Coal tar seal has been linked to concentrations of the contaminants polycyclic aromatic hydrocarbons dust.

    3.)Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs than apartments next to other types of parking lots.

    4.)Coal tar is a byproduct of the coking of coal

    5.)Coal tar can contain 50 percent or more PAHs by weight

  56. deondre surles 6th period on March 29th, 2010 4:02 pm

    Apartments with parking lots treated with the sealcoat.

    It contained house dust with much higher concentrations of PAH’s.

    There was students from Austin Texas that performed.

    Tar has been linked to contaminants.

    Coal tar is a byproduct of the coking of coal.

  57. madison extine 5th piriod on March 29th, 2010 4:44 pm

    . Black shiny substance painted over most parking lots is seal coat.

    .Tar is in the water that we drink.

    .Tar is toxic to fish and other wildlife

    There are two kinds of sealed coats,coal-tar-emulsion based products and asphalt-emulsion based products.

    The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

  58. KELSEY SCHRONCE 5th PERIOD on March 29th, 2010 4:48 pm

    1Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    2Two kinds of seal coat products are wildley used.
    3The scientist in Austin, Texas, that performed this interesting study are from the U.S. Geological Survey .,
    . Tar is in the water that we drink
    5. It is poisonous to fish and wild life.

  59. Courtney Franklin,2nd period on March 29th, 2010 7:04 pm

    1.) Coal-tar is the black shinny substance that is sparayed on parking lots.
    2.) Tar is in the water that we drink.
    3.) Tar is toxic to fish and other wildlife.
    4.) Carcinogens are toxic to fish and other water animals.
    5.)It usually wears off quickly espicially in high areas of traffic and has to be resealed every 3 to 5 years.

  60. Logan Knox 2nd on March 29th, 2010 7:34 pm

    1)Black shiny substance painted over most parking lots is seal coat.
    2)Coal tar is a byproduct of the coking of coal.
    3)Small particles of sealcoat are tracked indoors by residents after they walk across the parking lot.
    4)Sealcoat products are used in the U.S. a lot.
    5)Two kinds of sealcoat products are widely used.

  61. mauhaun taheri 1 on March 29th, 2010 8:09 pm

    1. Tar is in the water that we drink.
    2. Tar has been linked to contaminants.
    3.Tar is a toxic to fish and other wildlife.
    4.The study was in Austin, Texas.
    5.Sealcoat products are often used in the U.S

  62. Owen Clarke 4th on March 29th, 2010 8:39 pm

    1.Contaminated house dust is linked to parking lots with coal tar sealant.
    2. Coal tar is the byproduct of coking of coal.
    3. It is a shiny black substance that is sprayed on p lots, driveways, and playgrounds.
    4. The continental divide has something to do with the PAH in coal tar sealant.
    5. Seal coat particles are often tracked indoors by residents after they walk on the lot.

  63. Marilynlarry 6th on March 29th, 2010 9:26 pm

    1.Coal-Tar is very health hazardous
    2.It’s very dangerous to fish and humans
    3.Coal-Tar is used very commonly in U.S.
    4.2 coal-tar products are used world-wide
    5.The study was conducted in Austin Texas

  64. Reagan Locke 4th on April 4th, 2010 1:53 pm

    Contominated house dust is linked to parking lots with coal for sealant. Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight. The scientist in Austin, Texas, that performed this interesting study are from the U.S. Geological Survey. Conciogens are poisions to fish. Sealcoat products are widely used in the U.S.

  65. Courtney Terry 4th per on April 5th, 2010 6:57 pm

    1. Austin Texas is where the students that preformed the study.
    2. Tar is in the water that we drink.
    3. Tar is toxic to fish and other wildlife.
    4. Coal-tar is a black shinny substance.
    5. PAH concentration affects house dust.

  66. Lena Carter 1st period on April 19th, 2010 7:40 am

    1. Conntaminated house dust is linked to parking lots with coal for sealent.
    2. Coal-tar-based sealcoat is the black paint that is sprayed in parking lots.
    3.The scientists that performed this interesting study are from the U.S Georgraphy Survey.
    4. Conciogens are poisions to fish and other wildlife.
    5. The study that discovered the contaminated house dust was in Austin,Texas.

  67. terrell king 2ND on April 19th, 2010 2:36 pm

    1. it had dust
    2. it was dangerous
    3. people could have gotten sick
    4. its deadly
    5. watch out

  68. Taylor Brown on April 19th, 2010 5:33 pm

    1.)Black shiny substance painted over most parking lots is seal coat
    2.. Tar has been linked to contaminants
    3.)Caciogens are poisionis to fish
    4.“These findings represent a breakthrough in our understanding of one of the important sources of these contaminants in house dust and how these contaminants can move from outdoors to indoors.In the past, several factors have been thought to affect PAH concentrations in house dust, including tobacco smoking and frequency of vacuuming
    5.. Small particles of sealcoat contain extremely high concentrations of PAHs.

  69. claire lorino on April 26th, 2010 7:18 pm

    1. This article is about contaminated house dust linked to parking lots with coal tar sealant.
    2. Coal-tar-based sealcoat is the black paint that is sprayed in parking lots.
    3.Coal-Tar is used very commonly in U.S.
    4. Coal-tar is a black shinny substance.
    5. PAH concentration affects house dust.

  70. alex 4th period on May 3rd, 2010 4:33 pm

    1 Tar has been linked to contaminants and it includes the water that we drink.

    2 This study was done in Austin, Texas.

    3 Tar is the product of coking coal, and contains about 50 percent or more PAHs by weight.
    4 The scientists that did this study are from the group called the U.S Georgraphy Survey.

    5 It is toxic to fish and other wildlife.

  71. Taylor Brown on May 3rd, 2010 5:22 pm

    1.The City of Austin, Texas, estimates that before a ban on use of coal-tar-based sealcoat in 2006, about 660,000 gallons of sealcoat was applied every year in the city.

    2.These findings represent a breakthrough in our understanding of one of the important sources of these contaminants in house dust and how these contaminants can move from outdoors to indoors

    3. Coal tar is a byproduct of the coking of coal.

  72. Kaila Poleon 4th Period on May 3rd, 2010 7:34 pm

    1.Coal-tar-based sealcoat has been linked to elevated concentrations of the contaminants polycyclic aromatic hydrocarbons.

    2.This study was conducted in Austin, Texas, by scientists at the USGS.

    3.Coal tar is a byproduct of the coking of coal.

    4.Small particles of sealcoa are most likely tracked indoors by people after they walk across the parking lot.

    5.The sealcoat wears off of the surface of roads quickly, especially in areas of high traffic.

  73. Crystal Whitehouse --- 6th Period on May 3rd, 2010 8:00 pm

    ~ Coal-tar-based sealcoat has been linked to elevated concentrations of the contaminants PAHs in house dust
    ~ Apartments with adjacent parking lots treated with the coal-tar based sealcoat contained house dust with much higher concentrations of PAHs than apartments next to other types of parking lots
    ~ Coal tar is a byproduct of the coking of coal, and can contain 50 percent or more PAHs by weight.
    ~ PAHs are an environmental health issue because several are probable human carcinogens and they are toxic to fish and other aquatic life.
    ~ Small particles of sealcoat likely are tracked indoors by residents after they walk across the parking lot.

  74. ethan abston 5th period on May 3rd, 2010 9:25 pm

    1 Tar has been linked to contaminants.
    2 This includes the water that we drink.
    3 The study was done in Austin, Texas.
    4 Tar is a product of the coking of coal, and contains about 50 percent or more PAHs by weight.
    5 It is toxic to fish and other wildlife.

  75. Lena Carter on May 10th, 2010 7:32 pm

    1. Coal-tar is thesubstance that is sparayed on parking lots.
    2. Contominated house dust is linked to parking lots.
    3. The scientist that performed this interesting study are from the U.S. Geological Survey and is in Austin,Texas.
    4. Conciogens are poisions to fish.
    5. Sealcoat products are widely used in the U.S.

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