Final answer:
The statement is false; automobile emissions contribute to 28.2 percent of fossil fuel-related emissions, not more than half. The United States has made progress in reducing emissions through policies and increased fuel efficiency.
Step-by-step explanation:
The statement that 'More than half the air pollution in the United States is produced by automobiles' is false. In the United States in 2018, transportation systems were responsible for 28.2 percent of emissions from fossil fuel consumption according to the U.S. Environmental Protection Agency (EPA). Although a major portion of this percentage comes from passenger cars, light-duty trucks, sport utility vehicles, and minivans, it does not surpass the 50% mark. Moreover, due to the implementation of anti-pollution policies and improvements in fuel efficiency, emissions of certain key pollutants have declined substantially, and progress has been made in reducing overall carbon dioxide emissions.
Human activity does lead to a significant portion of air pollution, and everyday choices like driving less and using cleaner fuel can contribute to reducing one's carbon footprint and thereby the overall air pollution. Awareness and actions at both individual and policy levels are essential to continue this progress in reducing air pollution.