pollution - undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities

acid precipitation, acid rain - rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water

industrial air pollution - pollution resulting from an industrial plant discharging pollutants into the atmosphere

miasma - unhealthy vapors rising from the ground or other sources; "the miasma of the marshes"; "a miasma of cigar smoke"

small-particle pollution - air pollution caused by fine particles of soot (as from power plants or diesel engines)

smog, smogginess - air pollution by a mixture of smoke and fog