What percentage of all US airports are presently located in nonattainment areas?

The correct answer indicates that approximately 25% of all US airports are located in nonattainment areas. Nonattainment areas are regions that fall short of the national ambient air quality standards set by the Environmental Protection Agency (EPA), often due to high levels of air pollution.

This statistic is significant for several reasons. It highlights the relationship between airport operations and environmental standards, emphasizing the importance of maintaining air quality for the health of surrounding communities. Additionally, this percentage informs stakeholders—including policymakers, airport managers, and environmental agencies—about the specific challenges and considerations that need to be addressed in airports located in these areas.

By recognizing that a quarter of airports are affected by these regulations, it underscores the necessity for strategic planning and compliance measures to help mitigate the environmental impact of aviation while striving to improve air quality in those regions. This knowledge is essential for professionals involved in airport planning and management, as they must navigate both operational and regulatory landscapes in nonattainment areas.