- 行业: Government
- Number of terms: 3992
- Number of blossaries: 2
- Company Profile:
The reduction in the stratospheric ozone layer. Stratospheric ozone shields the Earth from ultraviolet radiation. The breakdown of certain chlorine and / or bromine-containing compounds that catalytically destroy ozone molecules in the stratosphere can cause a reduction in the ozone layer. For more information, please go to U. S. EPA's website on this subject.
Industry:Pollution control
The pollutant concentration used by air quality managers for designating attainment status of an air district with respect to the state and federal ambient air quality standards. Generally, the designation value is the highest concentration that remains after excluding certain qualifying values. For a specific pollutant, the designation value for the state and federal standards may not be the same.
Industry:Pollution control
规定的水平的一种不应超出了特定的时间期间，为保护公众健康的外部空气中的污染物。由联邦和州政府设立。（见还环境空气质量标准）。有关详细信息请参阅我们的环境空气质量标准网页。
Industry:Pollution control
The number of potential excess cancer cases from a lifetime exposure to one microgram per cubic meter (µ/m<sup>3</sup>) of a given substance. For example, a unit risk value of 5. 5x10<sup>-6</sup> would indicate an estimated 5. 5 cancer cases per million people exposed to an average concentration of 1 µ/m<sup>3</sup> of a specific carcinogen for 70 years.
Industry:Pollution control
