Which secondary air pollutant is found mainly around cities and is formed from burning coal or oil, which releases a combination of soot, carbon monoxide, and sulfur dioxide?

The answer is Industrial smog.

Explanation:

Industrial smog is a secondary pollutant formed from the burning of coal or oil which releases a combination of carbon monoxide, sulfur dioxide and soot which eventually cause damage to the ozone layer and the environment and it causes acid precipitation or acid rain.