The nation is making progress in initiatives to improve air quality – with certain qualifications. The Environmental Protection Agency’s “Latest Findings on National Air Quality: 2000 Status and Trends,” summarized by the Arizona Transportation Research Center, says "Aggregate emissions of pollutants tracked nationally have been cut 29%, but NOx (oxides of nitrogen) emissions have increased almost 20%, attributed mostly to growth in emissions from non-road sources.” The EPA is said to be ...

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