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Air Quality Planning and SIPs

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Transportation conformity ensures that Federal funding and approval goes to those transportation activities that are consistent with air quality goals and can have a significant impact on the transportation planning process. Transportation officials must be involved in the air quality planning process to ensure that emissions inventories, emissions budgets, and transportation control measures (TCMs) are appropriate and consistent with the transportation vision of a region.

Each State air quality agency is tasked with determining how best to achieve the Clean Air Act's (CAA's) goals and with developing state implementation plans (SIPs) for achieving health-based air quality standards. In some states, local air quality agencies also play a major role in air quality planning. SIPs are collections of regulations and measures used by a State to reduce emissions from stationary, area, and mobile sources and demonstrate attainment and maintenance of air quality standards. Decisions made in the air quality planning process and during SIP development can have a direct effect on transportation plans and projectcs. Transportation agencies need to participate fully in the air quality planning process to ensure that the decisions made reflect community priorities, including mobility.

Policy & Guidance



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Updated: 12/15/2015
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