present participle of smog

plural of smog

simple past tense and past participle of smog

Third-person singular simple present indicative form of smog

(informal) To get a smog check; to check a vehicle or have it checked for emissions.

A noxious mixture of particulates and gases that is the result of urban air pollution.

(US, California) A test for emissions produced by a vehicle, required for vehicle registration.

plural of photochemical smog

air pollution caused by photochemical reactions involving hydrocarbons, nitrogen oxides and other pollutants, especially in still air over cities.

plural of smog check