Which regulations must airports adhere to concerning air quality?

Airports must adhere to State Implementation Plans (SIP) as they are essential for ensuring compliance with national air quality standards set by the Environmental Protection Agency (EPA). SIPs are developed by individual states to demonstrate how they will achieve and maintain the National Ambient Air Quality Standards (NAAQS) established under the Clean Air Act. This is critical because airports can be significant sources of air pollution, including emissions from aircraft, vehicles, and ground support equipment.

By following the SIPs, airports align their operations with the state’s plans to reduce air quality issues, which helps in mitigating health risks associated with poor air quality, protecting the environment, and maintaining compliance with federal regulations. This is fundamental to the infrastructure planning of airports, as they must maintain air quality to ensure safety and meet regulatory standards necessary for operational continuity.

The other options, while related to air quality and environmental policies, do not specifically define the regulations airports must directly adhere to in their operations as closely as SIPs do.