Smog

Smog is also a kind of air pollution which is a portmanteau of smoke and fog. From vehicular emission from internal combustion engines and industrial fumes, modern smog which is a type of air pollution is derived that react in the atmosphere with sunlight to form secondary pollutants that also combine with the primary emission to form photochemical smog. Smog is also caused by large amount of coal burning in a place caused by a mixture of sulfur dioxide and smoke.

A new type of smoke known as photochemical smog was first described in the 1950s. When sunlight hits various pollutants in the air this type of smog forms by a mix of inimical chemicals that can be very dangerous.

A photochemical smog is the chemical reaction of nitrogen oxides, sunlight and volatile organic compounds in this atmosphere which leaves airborne particles and ground-level ozone.

In the atmosphere Nitrogen oxides are released by nitrogen and oxygen reacting together under temperature such as in the exhaust fossil-fuel-burning engines in cars, coal power plants, trucks and industrial manufacturing factories.

From man-made sources VOCs are released, such as gasoline or pertrol, paints, solvents, pesticides, and biogenic sources, such as pine and citrus tree emission.

Following matters are produces from noxious mixture

Aldehydes

Nitrogen oxides, such as nitrogen dioxide

Peroxyacyl nitrates

Tropospheric ozone

Volatile organic compounds