Annual U.S. electric power industry emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) have declined by 88% and 76%, respectively, between their peaks in 1997 and 2017. During this period, coal-fired generation was responsible for 90% of SO2 emissions and 76% of NOx emissions from the U.S. electric power industry. Among other factors, declining coal-fired generation and implementation of environmental regulations under the Clean Air Act Amendments (CAAA) of 1990 have both contributed to the decrease in electric power industry SO2 and NOx emissions. Source: Today in Energy – Changes in coal sector led to less SO2 and NOx emissions from electric power industry
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Source: CTRM Center