According to the EPA, what percentage of U.S. air pollution is caused by cars and trucks?

The correct response indicates that automobiles and trucks are responsible for approximately 20% of air pollution in the United States, according to the Environmental Protection Agency (EPA). This statistic highlights the significant role that transportation emissions play in overall air quality.

Vehicles contribute to air pollution through the release of various harmful substances, including nitrogen oxides (NOx), volatile organic compounds (VOCs), carbon monoxide (CO), and particulate matter. These pollutants can lead to health issues, environmental degradation, and contribute to climate change. The 20% figure underscores the importance of monitoring and regulating vehicle emissions as part of broader efforts to improve air quality and public health.

By understanding this percentage, one can appreciate the impact that transportation has on the environment and the need for advancements in vehicle technology, public transportation, and alternative fuel sources to reduce emissions from this sector effectively.