| 单词 | air quality standards |
| 释义 | Air quality standardsAir quality standardsair quality standardsair quality standardsA general term for the standards of air quality (concentration of pollutants for an average length of time) set by the Environmental Protection Agency or equivalent body in a particular country. In the US, the standards are based on the concentration of 5 ambient air pollutants (SO2, particulate matter, carbon monoxide, ozone, and NO2). |
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