Figure 25.3: A major source of air pollution is the burning of fossil fuels from factories,
power plants, and motor vehicles. Photo was taken prior to installation of emission controls
equipment for removal of sulfur dioxide and particulate matter. ( 13 )
Figure 25.4: The majority of air pollutants can be found in the burning of fossil fuels for
heat, electricity, industry, waste disposal, and transportation, the latter seen here on a busy
highway. ( 33 )