NAAQS Six Criteria Pollutants (EPA, 1970)

Vocabulary flashcards covering the six EPA NAAQS criteria pollutants identified in 1970.

Sulfur dioxide (SO2)

One of the six criteria pollutants identified by the EPA under the Clean Air Act; a gaseous pollutant emitted from burning sulfur-containing fuels.

Particulate matter (PM)

A mixture of solid or liquid particles suspended in the air; one of the six criteria pollutants.

Lead (Pb)

A heavy metal pollutant; one of the six criteria pollutants identified for health protection.

Ozone (O3)

A reactive gas formed in the lower atmosphere from other pollutants; ground-level ozone and one of the six criteria pollutants.

Nitrogen dioxide (NO2)

A nitrogen oxide pollutant; a gaseous pollutant and one of the six criteria pollutants.

Carbon monoxide (CO)

A colorless, odorless gas from incomplete combustion; one of the six criteria pollutants.