Smoke and fog combined.
http://www.wisegeek.com/what-is-photochemical-smog.htm Best I could do for you but .
Smog is a major form of air pollution that describes a smoky fog. Smog is formed when vehicle and industrial emissions interact with sunlight. This interaction also creates secondary pollutants.
Smog is created by the combination of pollutants from vehicle emissions, industrial activities, and other sources reacting with sunlight. It can have harmful effects on the environment by contributing to air pollution, acid rain, and climate change. Smog can also impact human health by causing respiratory issues, cardiovascular problems, and other health complications.
pollutants
Smog abatement means reducing the amount or intensity of smog.
pumps smog
Smog abatement means reducing the amount or intensity of smog.
Yes, there are two main types of smog: "photochemical smog" and "sulfurous smog." Photochemical smog forms in areas with a high concentration of automobile emissions, sunlight, and warm temperatures, while sulfurous smog is caused by the burning of coal and oil, emitting sulfur dioxide into the atmosphere.
Photochemical smog is a type of smog made when hydrocarbons and nitrogen oxides mix with sunlight.
London-type smog is caused mainly by air pollution due to combustion of coal and emission of sulphur dioxide and dust. Photochemical smog is a type of air pollution produced when sunlight acts upon motor vehicle exhaust gases to form harmful substances.
You see L.A. when the smog goes away. The smog is becoming unbearable.
cities are affected by smog