Question

Smog is produced due to

• A. smoke and fog
• B. air and metal dust
• C. water and nitrogen oxide
• D. chlorofluorocarbons

Answer 1

The correct option is A smoke and fog

Smog is a contraction of the words smoke and fog to refer to smoky fog due to its opacity and odour. It is a type of intense air pollution. It is categorized as being either summer smog or winter smog. Summer smog is primarily associated with the photochemical formation of ozone. When the temperatures are warmer and there is more sunlight present, photochemical smog is the dominant type of smog formation.

During winter months when the temperatures are colder, there is an increase in coal and other fossil fuel usage to heat homes and buildings. These combustion emissions, together with the lack of pollutant dispenser characterize winter smog formation.