Nonattainment area classifications

TABLE 25-7 Ozone Nonattainment Area Classifications and Associated Requirements... 

Nonattainment area classification One-hour ozone concentration design value, ppm Attainment date Major source threshold level, tons VOGs/yr Offset ratio for new/modified sources... 

For ozone specifically, the amendments established nonattainment area classifications ranked according to the severity of the area s air pollution problem ... 

Title I allows the EPA to define the boundaries of "nonattainment" areas for ozone, CO, and PMjg. Emission standards for these areas will be based on a new set of "nonattainment categories." EPA has established a classification system for ozone design values (goals) and attainment deadlines. Table 24-2 lists these parameters. 

If a nonattainment area is classified as serious, based on ambient ozone measurements, then the state must modify its SIP to bring the area into compliance in 9 years. The CAAA90 also specify the size and, therefore, the number of sources subject to regulatory control as a function of nonattainment classification. Table 24-3 illustrates these requirements for ozone nonattainment classifications of extreme and severe the state must include... 

Classification and Attainment Dates for Ozone Nonattainment Areas... 

As mentioned, nonattainment areas will have to implement different control measures, depending on their classification. Marginal areas, for example, are the closest to meeting the standard. They will be required to conduct an inventory of their ozone-causing emissions and institute a permit program. Nonattainment areas with more serious air quality problems must implement various control measures. The worse the air quality, the more controls areas will have to implement. 

Choose a specific metropolitan area and determine its classification as an ozone nonattainment area. Find the alternative deadline and allowable emissions of NO and VOC com-... 

Ozone Classifications. The CAA sets a new classification structure for ozone nonattainment areas based on the severity of the nonattainment problem. For each area classified under this section, the attainment date is as expeditious as practicable but no later than the date in the following table. The classification scheme is as follows ... 

The NSR and RACT requirements apply to major stationary sources. The CAA s definition of major stationary source varies with the classification of the ozone nonattainment area. For marginal and moderate nonattainment areas a major stationary source for NOx is any stationary source that emits or has the potential to emit 100 tons per year or more of NOx. In the case of serious, severe, or extreme ozone nonattainment areas within the transport region, lower threshold definitions of major stationary source apply to NOx sources (50, 25 and 10 tons per year, respectively). 

NO, NSR Requirements. The CAA NO, provisions for NSR apply to all ozone nonattainment areas with a classification of marginal or higher. Previously these NO, NSR requirements applied only in areas designated nonattainment for the nitrogen dioxide NAAQS (i.e., only in the Los Angeles, CA area). 

Nonattainment. Title I of the act established a new classification of nonattainment areas for each pollutant and included deadlines and mandated degrees of emission reductions required to achieve attainment, based on the severity of present pollution levels. 

These classifications and attainment dates apply to areas previously designated nonattainment under the 1-h ozone NAAQS. 

One of the first steps regarding potential pollutant sonrces is to determine the applicable regnlations. For this, an emissions estimate must be made, and the in-attainment or nonattainment classification of the area in which the source is to be located must be determined. The EPA has classified all areas throughout the United States, including all U.S. possessions and territories.The area is classified as either in-attainment (air quality is better than federal standards) or nonattainment (air quality is worse than federal standards). 

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