Question

ozone forms when hydrocarbons and nitrogen oxides combine in the presence of sunlight. which of these is a secondary pollutant

Answer 1

Ozone is considered a secondary pollutant. It is not directly emitted into the atmosphere, but rather forms as a result of chemical reactions involving primary pollutants. In this case, hydrocarbons and nitrogen oxides are the primary pollutants that combine in the presence of sunlight to form ozone. Therefore, ozone is a secondary pollutant in this context.