SIP: Glossary and Abbreviations

 (Ozone) Air Quality Classifications-For the ozone National Ambient Air Quality Standard (NAAQS), an area's attainment status is defined by a classification:
  • Extreme: The area has a design value of 0.187 ppm or above and has 20 years to attain.
  • Severe 17: The area has a design value of 0.127.0.187 ppm and has 17 years to attain.
  • Severe 15: The area has a design value of 0.120.0.127 ppm and has 15 years to attain.
  • Serious: The area has a design value of 0.107.0.120 ppm and has nine years to attain.
  • Moderate: The area has a design value of 0.092.0.107 ppm and has six years to attain.
  • Marginal: The area has a design value of 0.085 up to 0.092 ppm and has three years to attain.
attainment demonstration-A plan to demonstrate how the nonattainment area expects to meet the National NAAQS by the deadline.
control strategy-Measures to deal with air pollution. Examples of control strategies include an emissions trading program or vehicle inspection and maintenance.
eight-hour ozone standard-The new indicator of air quality acceptability as it pertains to ground-level ozone. The current threshold value for this standard is 0.08 ppm, measured as maximum daily eight-hour average concentrations. To attain the ozone NAAQS, the three-year average of the annual fourth-highest daily maximum eight-hour ozone concentration must not exceed 0.08 ppm.
nonattainment area-A geographic area that fails to meet a NAAQS. An area must be officially designated by the Environmental Protection Agency (EPA), under procedures set forth by the Federal Clean Air Act (CAA), in order to be classified in nonattainment.
one-hour ozone standard-The former indicator of air quality acceptability as it pertains to ground-level ozone. This indicator involves taking an average one-hour concentration of pollutants of a threshold of 0.12 parts per million (ppm). An area meets the ozone NAAQS if the monitored ozone level does not exceed the standard more than three times over a consecutive three-year period.  The one-hour ozone standard was revoked effective June 15, 2005.
 

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