Significant Hazardous Air Contaminants

Acetaldehyde | Acrolein | AcrylonitrileArsenic | Benzene |1,3 Butadiene |Carbon Tetrachloride | Chloroform | Ethylene Dichloride | Formaldehyde | Tetrachloroethylene


Acetaldehyde

Primary sources:  Automobile Exhaust  

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Acrolein

Primary source: Motor Vehicle Exhaust  

 * Data for 2010-2013 invalidated by AQCD

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Acrylonitrile

Primary source:  

  * Data for 2010-2013 invalidated by AQCD

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Arsenic

Primary source: 

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Benzene

Primary source:  Automobile Exhaust 

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1, 3 Butadiene

Primary Source:  Motor Vehicle Exhaust Wood Burning 

1,3 Butadiene 2010 Underhill 0.004 Burlington 0.09 Rutland 0.12 2011 Underhill 0.007 Burlington 0.1 Rutland 0.09 2012 Underhill 0.018 Burlington 0.08 Rutland 0.13 2013 Underhill 0.007 Burlington 0.07 Rutland 0.11 2014 Underhill 0.012 Burlington 0.08 Rutland 0.14 2015 Underhill 0.006 Burlington 0.093 Rutland 0.15 Standard 0.03 micrograms per cubic meter

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Carbon Tetrachloride

Primary source:  Note due to it's long history of use and extended half-life in the atmosphere, carbon tetrachloride is present world-wide at a concentration of 0.5 ug.m3 (2014)

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Chloroform

Primary source:  

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Ethylene Dichloride

Primary source:  

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Formaldehyde

Primary sourc e:  

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Tetrachloroethylene

Primary source: 

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