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FIGURE 1-2 Gross trends in drivers and aggregate emissions since 1980 in the United States. Source: EPA 2012a.

TABLE 1-1 Change in Conventional Air Pollutant Emissions Over the Last 3 Decades

Change, %
1980–2010 1990–2010 2000–2010
Carbon monoxide (CO) -71 -60 -44
Lead (Pb) -97 -60 -33
Nitrogen oxides (NOx) -52 -48 -41
Volatile organic compounds (VOCs) -63 -52 -35
Direct particulate matter less than 10 μm in diameter (PM10) -83a -67 -50
Direct particulate matter less than 2.5 μm in diameter (PM2.5) ---b -55 -55
Sulfur dioxide (SO2) -69 -65 -50

a Direct PM10 emissions for 1980 are based on data since 1985.

b --- Trend data not available.

Source: EPA2012a.



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