Fossil fuels such as coal, oil, and natural gas create the most air pollution when burned. These fuels release large amounts of carbon dioxide, sulfur dioxide, nitrogen oxides, and other harmful pollutants into the atmosphere, contributing to smog, acid rain, and climate change. Burning fossil fuels also releases particulate matter, which can worsen respiratory problems and other health issues. Renewable fuel sources, such as wind, solar, and hydropower, produce much less air pollution when used for energy generation.
