NOx budget trading program: compliance and environmental results

Source: US EPA
"More than 102 million Americans are breathing cleaner air due to decreases in smog-forming emissions of nitrogen oxides (NOx) according to the NOx Budget Trading Program annual report. The 2007 summertime NOx emissions from power plants and industrial sources were down by 60 percent compared to 2000 levels and 74 percent below 1990 levels in 20 eastern states and the District of Columbia. The program helped improve air quality in 95 percent of nonattainment areas in the east, with 64 percent of these areas now below the ozone standard."