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 those from natural sources like fires and dust storms as well as man-made sources like fossil fuel combustion. The Air Quality Index ranges from 0 to 500, indicating the level of health concerns from air pollution. Higher levels mean pollution may negatively impact one's health, especially for sensitive groups. Common air pollutants are also summarized, along with their sources and health effects.