explain the difference between industrial, gray and photochemical smog
Industrial smog occurs when the smoke and sulfur dioxide produced from burning coal merges with fog and creates a yellowish-brown-colored haze close to ground level. Photochemical smog forms as the result of increased usage of all fossil fuels, including gasoline and the burning of trees and organic waste.
Best Answer: There are two main types of smog: gray and brown. Gray smog is associated with old cities like London or New York and is produced through large-scale burning of coal and fuel. Brown smog is more characteristic of a city like L.A. and is produced by automobile exhaust.