نمایش نتیجه 1 تا 2 از 2 نتیجه یافت شده برای National Ambient Air Quality Standards:
abbr: National Ambient Air Quality Standards.
n pi: (NAAQS) standards listed under the CAA for six major, or criteria, pollutants: ozone, carbon monoxide, sulphur dioxide, lead, nitrogen dioxide, and particulate matter. Areas that exceed the recommended levels for these pollutants are nonattainment areas, or areas with poor air quality;areas that meet or fall below the NAAQS levels are attainment areas, or areas with good air quality.
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