Air monitoring
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The trading of emissions began in the United States for SO2 in an effort to decrease the amount of SO2 in the atmosphere in a fair manner. The fair manner refers to the fact that the coal fired plants need to reduce their emissions of S02 but not to “shut down” facilities which cannot comply. The emphasis was on the economic side of emitting gases. The program was directed at the 110 largest producers of Acid Rain in 1995 to reduce S02 compared to the base line 1980 levels. Here is a rough idea of how it works....
IET 36.3 May