There are two recognized types of smog, which are sulfurous smog and photochemical smog. Sulfurous smog is a high concentration of sulfur oxides in the air. Photochemical smog is nitrogen oxides and hydrocarbon vapors em... More »

Industrial smog is comprised of toxic emissions and is caused by burning fossil fuels, such as coal. The emissions rise into the air and collect as thick clouds of dust and other particles. More »

A combination of atmospheric chemicals, typically pollutants, interacting with sunlight causes smog. Smog, most common in sunny cities, forms ground-level ozone, which can cause respiratory problems. More »

Photochemical smog is formed when emissions containing nitrogen oxide, such as car exhaust, interact with volatile organic compounds in the presence of sunlight. The oxygen in the compounds and the heat from the sunlight... More »

A combination of atmospheric chemicals, typically pollutants, interacting with sunlight causes smog. Smog, most common in sunny cities, forms ground-level ozone, which can cause respiratory problems. More »

Industrial smog is comprised of toxic emissions and is caused by burning fossil fuels, such as coal. The emissions rise into the air and collect as thick clouds of dust and other particles. More »

STAR smog check stations inspect vehicles for compliance with emissions standards in the state of California. Drivers may be selected randomly for inspection; certain types of vehicles may be required to have an inspecti... More »

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