smog
Photochemical
smog is produced when sunlight reacts with nitrogen oxides and at least one volatile organic compound (VOC) in the atmosphere. Nitrogen oxides come from
car exhaust, coal power plants, and factory emissions.
What Causes Smog?
Question: What Causes Smog?
Answer: Smog is produced by a set of complex photochemical reactions involving
volatile organic compounds (VOCs),
nitrogen oxides and sunlight, which form ground-level
ozone.
Smog-forming pollutants come from many sources such as
automobile exhaust, power plants, factories and many consumer products, including paint, hairspray, charcoal starter fluid, chemical solvents, and even plastic popcorn packaging.
Smog - Wikipedia, the free encyclopedia
Smog is a type of air
pollutant. The word "smog" was coined in the early 20th century as a
portmanteau of the words
smoke and
fog to refer to smoky fog.
[1] The word was then intended to refer to what was sometimes known as
green soup fog, a familiar and serious problem in
Mexico from the 19th century to the mid 20th century. This kind of visible air pollution is composed of nitrogen oxides, sulfur oxides, ozone, smoke or particulates among others (less visible pollutants include carbon monoxide, CFCs and radioactive sources). Man-made smog is derived from
coal emissions, vehicular emissions, industrial emissions, forest and agricultural fires and photochemical reactions of these emissions.
