gaseous, aerosol or particulate pollutants other than the six criteria pollutants (see criteria pollutants) which are present in the air in low concentrations with characteristics such as toxicity or persistence so as to be a hazard to human, plant or animal life.

Any air pollutant for which a National Ambient Air Quality Standard (NAAQS) does not exist that may reasonably be anticipated to cause serious or irreversible chronic or acute health effects in humans [..]

chemicals released into the air that are known or suspected to cause cancer or other serious health problems

Any air pollutant for which a national ambient air quality standard (NAAQS) does not exist (i.e. excluding ozone, carbon monoxide, PM-10, sulfur dioxide, nitrogen oxide) that may reasonably be anticip [..]

Any air pollutant for which a national ambient air quality standard (NAAQS) does not exist (i.e. excluding ozone, carbon monoxide, PM-10, sulfur dioxide, nitrogen oxide) that may reasonably be anti [..]

A group of air pollutants that are known or suspected to cause serious health problems such as cancer, birth defects, and lung damage. Examples of air toxics include asbestos, lead, and mercury.

Generally defined as air pollutants known or suspected to cause cancer or other serious health problems. They also may disrupt reproductive processes, cause birth defects and can cause serious environmental and ecological problems.

A generic term referring to a harmful chemical or group of chemicals in the air. Substances that are especially harmful to health, such as those considered under U.S. EPA's hazardous air pollutan [..]

Also known as toxic air pollutants or hazardous air pollutants, these are chemicals that cause or may cause serious effects in humans, and may be emitted into the air in quantities that are large enou [..]

A generic term referring to a harmful chemical or group of chemicals in the air. Typically, substances that are especially harmful to health, such as those considered under the EPA's hazardous air pollutant program or California's AB 1807 toxic air contaminant program, are considered to be air toxics. Technically, any compound that [..]

Any air pollutant for which an NAAQS does not exist (i.e. excluding ozone, carbon monoxide, PM-10, sulfur dioxide, nitrogen dioxide) that may reasonably be anticipated to cause cancer, developmental effects, reproductive dysfunctions, neurological disorders, heritable gene mutations or other serious or irreversible chronic or acute health effects i [..]