Title 1 Air Quality and Emissions Limits

The NAAQS set allowable limits for the presence of criteria pollutants in the ambient air. Criteria pollutants, so called because health-based criteria are used to set the standards, include ground level ozone, NOx, VOC, CO, PM-10, and lead. The standards are developed in two phases: primary standards are set to protect human health and secondary standards are set to protect environmental health.

The CAAA requires that each state designate its air quality control regions as being either in attainment or nonat-tainment with the NAAQS, using the guidelines in Title I of the CAAA. Those states with areas designated as nonattain-ment must develop attainment plans that include the following:

• Certain mandatory limits affecting existing sources.

• Comprehensive inventories of actual emissions, and assessment of the impact of planned controls.

• Rules for permits for new and modified major stationary sources.

• Enforceable emissions limits and control measures (e.g., fees, marketable permits) and timetables for attainment of the NAAQS.

• Contingency measures if areas fail to make "reasonable further progress"

(RFP) or attain the NAAQS on time.

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