Air Quality Conformity applies to long-range transportation plans, shorter-term transportation improvement programs (TIPs) and transportation projects funded or approved by the Federal Highway Administration (FHWA) or the Federal Transit Administration (FTA). Conformity requirements apply in areas that either do not meet or previously have not met certain air quality standards.
Conformity determinations must be made at least every three years, or when transportation plans or TIPs are updated. Also, conformity determinations must be made within 18 months of certain actions on the state's air quality plan. In addition, conformity determinations must be made within 12-months of an area being designated by Environmental Protection Agency (EPA) as nonattainment for ozone (O3), carbon monoxide (CO), particulate matter (PM-10 and PM-2.5), or nitrogen dioxide (NO2), the pollutants for which conformity is required.
In nonattainment and maintenance areas, projects must come from a currently conforming transportation plan and TIP that have undergone a conformity determination which has been approved by FHWA and FTA. In carbon monoxide and particulate matter nonattainment and maintenance areas, additional analysis may be necessary for Federally funded or approved projects, to determine if a project has localized or micro-scale air quality impacts as part of project-level conformity.
Fredericksburg, Virginia 8-Hour Ozone Maintenance Area Transportation Conformity Analysis Report
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