By Joel M. Schwartz, Steven F. Hayward
This e-book files how a lot U.S. air caliber has superior in fresh many years and provides via a long way the main actual photo on hand of continuous pollution difficulties and the way to deal with them.
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Extra resources for Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks
Benzo(a)pyrene levels have been dropping an average of 8 percent per year. The California Department of Transportation estimates that diesel fuel use has been increasing about 2 percent per year during the last few years. 29 Hexavalent chromium is emitted mainly by metal-plating facilities. Hexavalent chromium levels have been dropping by 9 percent per year. htm (accessed March 21, 2007). NOTES: Benzene and 1,3-butadiene are in parts per billion. Chromium VI and benzo(a)pyrene are in nanograms per cubic meter.
But this isn’t the full story, because ambient data don’t necessarily show when environmental cleanup began. For example, total pollution emissions might continue to grow due to a growing economy and a growing population, even if emissions per capita or per unit of economic activity are in decline. S. : Government Printing Office, 1977). Chart is adapted from I. M. : Cato, 1999). and services consumers need or want. This appears to be exactly what happened in America during the twentieth century.
Note that the shape of the continuous-sites trend is similar to that of the all-sites trend, demonstrating that the ozone declines are real. In fact, the continuous-sites trend is even steeper than the all-sites trend. Although the continuous sites, on average, now have ozone levels similar to all sites, note that in the past they had significantly more ozone exceedance days. This is to be expected, as areas with the worst air pollution have naturally tended to have the most intensive pollution monitoring.
Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks by Joel M. Schwartz, Steven F. Hayward