What term refers to pollutants that are formed by the combination of primary pollutants in the atmosphere?

The correct term for pollutants that are formed by the interaction of primary pollutants in the atmosphere is secondary pollutants. Primary pollutants are those that are emitted directly into the atmosphere, such as carbon monoxide or sulfur dioxide. When these pollutants react with each other or with other atmospheric components, they can create secondary pollutants, which include substances like ozone or fine particulate matter. This process often occurs through various chemical reactions in the atmosphere and typically involves sunlight as a catalyst.

Understanding secondary pollutants is crucial in the context of air quality and public health, as they can have significant impacts on environment and human health, especially in urban areas. Monitoring and addressing secondary pollutants is a vital part of community and public health initiatives aimed at reducing air pollution and its associated health risks.