From 'smoky fog', smog is a form of pollution often associated with cities.
From 'smoky fog', smog is a form of pollution often associated with cities. It is caused by the reaction of pollutants in the atmosphere with sunlight, to form a range of highly reactive secondary pollutants. These can be very harmful to human health and the environment.
It is caused by the reaction of pollutants in the atmosphere with sunlight, to form a range of highly reactive secondary pollutants. These can be very harmful to human health and the environment.