Syn: photochemical smog. The type of smog produced by oxidation of exhaust gases from internal combustion engines, caused by the interaction of nitrogen oxides and volatile organic compounds (VOCs) with ionized solar radiation, i.e., ultraviolet radiation. This kind of smog is a serious upper respiratory irritant. If exposure is prolonged and/or frequently repeated, it can cause permanent respiratory damage.
Subjects: Public Health and Epidemiology.