Air pollutants are substances in the air that can have harmful effects on human health, the environment, and wildlife. Common air pollutants include nitrogen dioxide, sulfur dioxide, carbon monoxide, particulate matter, and volatile organic compounds. These pollutants can come from a variety of sources such as vehicles, industrial processes, and natural sources like wildfires and volcanic eruptions. Researchers in the field of air pollutants study the sources, distribution, and effects of these pollutants on air quality and public health. They also work to develop strategies for reducing air pollution through regulations, emission control technologies, and sustainable practices. Understanding air pollutants is important for protecting human health, ecosystems, and the overall quality of the air we breathe.