Public Health Nursing Practice Exam

What is the greatest single source of air pollution in the United States?

1. Waste incineration

2. Power plants

3. Motor vehicles

4. Molds

The correct answer is: Motor vehicles

Motor vehicles are the greatest single source of air pollution in the United States due to the significant emissions produced by cars, trucks, and other forms of transportation. These vehicles release a variety of pollutants, including nitrogen oxides, volatile organic compounds, carbon monoxide, and particulate matter. The widespread use of personal and commercial motor vehicles leads to high levels of traffic-related air pollution, especially in urban areas where congestion is common. The impact of vehicle emissions is especially pronounced because they not only contribute to poor air quality but also are linked to respiratory and cardiovascular diseases. Efforts to reduce these emissions through strategies like stricter fuel standards, promoting electric vehicles, and encouraging public transportation are essential for improving public health and reducing overall air pollution levels. While other sources of pollution, such as power plants and waste incineration, do contribute to air quality issues, the extensive reliance on motor vehicles remains the most significant contributor to air pollution across the nation.