tiny solid or liquid particules, generally soot and aerosols. The size of the particles (2.5 microns or smaller, about 0.0001 inches or less) allows them to easily enter the air sacs deep in the lungs [..]

a term for the conversion of sulfur oxide and nitrogen oxide emissions into acidic compounds which precipitate in rain, snow, fog, or dry particles

occurring over a short period of time; used to describe brief exposures and effects which appear promptly after exposure

health effects from exposure to air contaminants that may range from relatively mild temporary conditions, such as minor eye or throat irritation, shortness of breath, or headaches, to permanent and s [..]

particle of solid or liquid matter that can remain suspended in the air because of its small size (generally under one micron)

an air pollution abatement device that removes undesirable organic gases through incineration

so–called "pure" air is a mixture of gases containing about 78 percent nitrogen; 21 percent oxygen; less than 1 percent of carbon dioxide, argon, and other inert gases; and varying a [..]

areas defined by geographical or administrative boundaries; used for air pollution control programs

sampling for and measuring of pollutants present in the atmosphere

the presence of polluting gases and suspended particles in the atmosphere in excess of air quality standards