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

A Class I Area is Under the Clean Air Act. a Class I Area is one in which visibility is protected more

A Class I Substance is One of several groups of chemicals with an ozone depletion potential of 0.2 or higher, including CFCS, Halons, Carbon Tetrachloride, and Methyl Chloroform (listed in the Clean Air Act), and HBFCs and Ethyl Bromide (added by EPA regulations).

A Global radiation is Total solar radiant Energy impinging on a surface, equal to the sum of direct and diffuse radiation.

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