Primary pollutants are pollutants that are directly emitted into the atmosphere from a specific source, such as vehicles, factories, or power plants. These pollutants can have harmful effects on human health and the environment. Examples of primary pollutants include carbon monoxide, sulfur dioxide, nitrogen oxides, volatile organic compounds, particulate matter, and lead. These pollutants can contribute to a variety of issues, such as smog, acid rain, and respiratory problems.
