secondary pollutants

Secondary pollutants are substances in the air that form through chemical reactions between primary pollutants released from sources like vehicles and factories and other components in the atmosphere. Unlike primary pollutants, which are directly emitted, secondary pollutants develop after these initial emissions interact with sunlight, moisture, and other chemicals. Examples include ozone and certain types of smog, which can cause health problems and environmental harm. Understanding secondary pollutants is important because they often form in the atmosphere away from the original source, affecting air quality over larger areas and longer periods.