- Coal-fired power plants: Burning coal releases sulfur dioxide, nitrogen oxides, and particulate matter into the air, which can all contribute to respiratory problems and other health issues.
- Industrial activities: Many industrial processes release pollutants into the air, including volatile organic compounds (VOCs) and hazardous air pollutants (HAPs).
- Motor vehicles: Emissions from cars, trucks, and other motor vehicles contribute to air pollution, especially in urban areas.
- Agricultural activities: Certain agricultural practices, such as the application of pesticides and fertilizers, can release pollutants into the air.
- Residential heating: Burning fuel for home heating can release pollutants into the air, especially in areas where coal or wood is the primary fuel source.