The three main anthropogenic sources of gaseous air pollutants in the United States are soil erosion, volcanoes, and forest fire
s soil erosion, volcanoes, and forest fires A soil erosion, volcanoes, and energy production soil erosion, volcanoes, and energy production B industry, construction, and agriculture industry, construction, and agriculture C industry, transportation, and energy production industry, transportation, and energy production D industry, transportation, and agriculture