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Background Concentration Estimates

National-Scale Air Toxics Assessment
Background Concentration Estimates
PollutantBackground
Concentration (µg/m3)
Benzene0.48
Carbon tetrachloride0.88
Chloroform0.083
Ethylene dibromide0.0077
Ethylene dichloride0.061
Formaldehyde0.25
Hexachlorobenzene.000093
Mercury compounds0.0015
Methylene chloride0.15
Polychlorinated biphenyls0.00038
Perchloroethylene (Tetrachloroethylene)0.14
Trichloroethylene0.081

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