Download Air Quality in America: A Dose of Reality on Air Pollution by Joel M. Schwartz, Steven F. Hayward PDF

By Joel M. Schwartz, Steven F. Hayward

This booklet files how a lot U.S. air caliber has greater in contemporary a long time and provides by way of a long way the main actual photograph to be had of constant pollution difficulties and the way to deal with them.

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Additional resources for Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks

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Trends are based on the second-highest 8-hour-average CO level measured each year at each monitoring location. 28 Benzo(a)pyrene is one of a family of organic compounds known as polycyclic aromatic hydrocarbons (PAH), which are components of soot. S. htm (accessed March 21, 2006). NOTES: For each pollutant, chart is based on the standard with the highest violation rate (for example, the 8-hour CO standard, rather than the 1-hour CO standard). fossil-fuel combustion sources, and forest fires. Benzo(a)pyrene levels have been dropping an average of 8 percent per year.

In several cases, even though the worst area of the county might have ten or more exceedance days per year, the best area has only a few or even zero exceedances. Both of these observations will come into play later in this book, when we discuss why public perception of air pollution is so different from reality. html (accessed September 29, 2006). The Chemistry of Slower Progress on 8-Hour Ozone Levels If there is a pessimistic note in all the good news on air quality trends, it is that 8-hour ozone levels have improved more slowly than those of other pollutants, declining only slightly during the 1990s before hitting the record lows of the last few years.

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.

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