- 行业: Government
- Number of terms: 3992
- Number of blossaries: 2
- Company Profile:
A comprehensive term for the various ways acidic compounds precipitate from the atmosphere and deposit onto surfaces. It can include: 1) wet deposition by means of acid rain, fog, and snow; and 2) dry deposition of acidic particles (aerosols).
Industry:Pollution control
A numerical index used for reporting severity of air pollution levels to the public. It replaces the formerly used Pollutant Standards Index (PSI). Like the PSI, the AQI incorporates five criteria pollutants -- ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide -- into a single index. The new index also incorporates the 8-hour ozone standard and the 24-hour PM2.5 standard into the index calculation. AQI levels range from 0 (Good air quality) to 500 (Hazardous air quality). The higher the index, the higher the level of pollutants and the greater the likelihood of health effects. The AQI incorporates an additional index category -- unhealthy for sensitive groups -- that ranges from 101 to 150. In addition, the AQI comes with more detailed cautions. For more information, see our air quality index top page.
Industry:Pollution control
Written authorization from a government agency (e. G. , an air quality management district) that allows for the construction and / or operation of an emissions generating facility or its equipment within certain specified limits. For more information, please go to our permitting activities portal page.
Industry:Pollution control
Very fine carbon particles that have a black appearance when emitted into the air.
Industry:Pollution control
The use of materials, processes, or practices to reduce, minimize, or eliminate the creation of pollutants or wastes. It includes practices that reduce the use of toxic or hazardous materials, energy, water, and/or other resources. For more information, please go to our pollution prevention program website.
Industry:Pollution control
The vapor density is expressed in grams per liter (g / L) and is comparedto the density of air (air=1).
Industry:Pollution control
The weight of a pollutant emitted per unit of time (e. G. , tons / year).
Industry:Pollution control
The solubility of a substance in water provides information on the fate and transport in the environment. The higher the water solubility, the greater the tendency to remain dissolved and the less likely to volatilize from the water. Low water soluble substances will volatilize more readily in water and will partition to soil or bioconcentrate in aquatic organisms.
Industry:Pollution control
The quantity of health risk remaining after application of emission control.
Industry:Pollution control
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
