A decrease in the use of coal and an increase in the use of gas for electric power generation due to cheaper natural gas prices has played a significant role in reducing US SO2 and NOx emissions in recent years, according to the US Energy Administration (EIA). Between 1990 and 2012, SO2 emissions from electrical power generation fell from over 15 million short tons to about 3 million short tons, while COx emissions dropped from about 6 million short tons to less than 2 million short tons.
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