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The outermost layer of the Earth's atmosphere extending from about 60 miles to several hundred miles. The temperature of this layer varies from many hundreds to thousands of degrees Celsius.
Industry:Pollution control
The middle value in a population distribution, above and below which lie an equal number of individual values; midpoint.
Industry:Pollution control
The lowest concentration of a substance that can reliably measured.
Industry:Pollution control
The gaseous phase of liquids or solids at atmospheric temperature and pressure.
Industry:Pollution control
The cost of an emission control measure assessed in terms of dollars-per-pound, or dollars-per-ton, of air emissions reduced.
Industry:Pollution control
The evaporative properties of gasoline. Gasoline vapor is a volatile organic compound. (See also Reid Vapor Pressure. )
Industry:Pollution control
The extent to which the available information supports the hypothesis that a substance causes an effect in humans. For example, factors which determine the weight-of-evidence that a chemical poses a hazard to humans include the number of tissue sites affected by the agent; the number of animal species, strains, sexes, relationship, statistical significance in the occurrence of the adverse effect in treated subjects compared to untreated controls; and the timing of the occurrence of adverse effect.
Industry:Pollution control
The chemical reaction of a substance with oxygen or a reaction in which the atoms in an element lose electrons and its valence is correspondingly increased.
Industry:Pollution control
The configuration of a surface, especially the Earth's surface, including its relief and the position of its natural and man-made features.
Industry:Pollution control
The amount of light obscured by particle pollution in the atmosphere. Opacity is used as an indicator of changes in performance of particulate control systems.
Industry:Pollution control
