Question

The greatest single source of air pollution in the United States is from:

a.waste incineration.
b.power plants.
c.motor vehicles.
d.molds.

Answer 1

c. motor vehicles

Step-by-step explanation:

Motor vehicles are a significant source of air pollution in the United States due to the combustion of fossil fuels, primarily gasoline and diesel, in internal combustion engines. This process releases pollutants such as nitrogen oxides, carbon monoxide, particulate matter, and volatile organic compounds into the atmosphere. Emissions from vehicles contribute to smog formation, respiratory problems, and other air quality issues. While other sources, like power plants and industrial activities, also contribute to air pollution, motor vehicles are a major and widespread contributor, especially in urban areas with high traffic density.

Answer 2

The greatest single source of air pollution in the United States is motor vehicles, specifically the burning of fossil fuels in cars, trucks, and other vehicles.

Step-by-step explanation:

The greatest single source of air pollution in the United States is motor vehicles, specifically the burning of fossil fuels in cars, trucks, and other vehicles. Vehicle emissions, which include carbon monoxide, nitrogen oxides, and particulate matter, contribute significantly to air pollution and the formation of smog. According to a study by MIT, vehicle emissions are responsible for tens of thousands of premature deaths in the United States each year.