In order to implement and enforce federal Clean Air Act requirements, states must:

States must develop state implementation plans (SIPs) to fulfill the requirements set forth by the federal Clean Air Act. SIPs are comprehensive frameworks that outline how each state will achieve and maintain the National Ambient Air Quality Standards (NAAQS) established by the Environmental Protection Agency (EPA). This involves identifying the sources of air pollution within the state, determining the emission reductions needed to meet air quality standards, and describing the strategies and measures that will be employed to achieve these reductions.

The necessity for SIPs stems from the Clean Air Act's design, which allows states to tailor their specific plans for air quality management, while ensuring that federal standards are met. These plans must be submitted to the EPA for approval, and states are held accountable for adhering to their plans and making necessary adjustments to meet the evolving standards.

While developing motor vehicle testing programs, establishing state environmental protection agencies, and securing federal permits for stationary sources of pollution are all components of broader air quality management efforts, they are not the primary obligation for states under the Clean Air Act. The SIP is the cornerstone document that ensures compliance with federal air quality standards at the state level.