What are the two types of smog?

The two types of smog are industrial smog and photochemical smog. Industrial smog, often associated with coal burning, consists of a mixture of smoke, sulfur dioxide, and fog, typically prevalent in colder, industrial cities. Photochemical smog, on the other hand, occurs in warm, sunny conditions and results from the reaction of sunlight with pollutants like nitrogen oxides and volatile organic compounds, leading to the formation of ozone and other harmful chemicals.