Deidre Jones discusses air pollution and the Air Quality Index. She defines air pollution as particles or gases not normally found in the air, including natural sources like forest fires and unnatural sources from burning fossil fuels. The Air Quality Index ranges from 0 to 500, indicating the level of health concerns from air pollution. Higher numbers mean greater health risks, especially for sensitive groups. Common air pollutants are described along with their sources and health effects. Smog is discussed as a combination of gases and particulate matter that reduces visibility and causes respiratory problems. Ways to reduce pollution and stay informed are provided.