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The Database for the Environment gives you a good overview about all important aspects of our environment.

A Critical Effect is the first adverse effect, or its known precursor, that occurs as a Dose Rate increases. Designation is based on evaluation of overall database.

A Construction Ban is If, under the Clean Air Act, EPA disapproves an area's planning requirements for correcting nonattainment, EPA can ban the construction or modification of any major stationary source of the pollutant for which the area is in nonattainment.

The Maximum Holding Time is the longest temporal period a sample may be held after collection and before analysis.

The Repeatability is the degree of agreement between independent test results produced by the same analyst, using the same test method and equipment on random aliquots of the same sample within a short time period.