By Joel M. Schwartz, Steven F. Hayward
This ebook files how a lot U.S. air caliber has more desirable in contemporary many years and provides through a ways the main actual photo to be had of constant 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
Under this “VOC-limited” or “VOC-sensitive” condition, reducing VOCs reduces ozone, but reducing NOx increases ozone. 13 38 AIR QUALITY IN AMERICA During the late 1990s, EPA embarked on a policy of seeking large NOx reductions in metropolitan areas. The resulting automobile, heavy-duty diesel truck, and nonroad diesel equipment standards will eliminate more than 80 percent of metropolitan NOx emissions from motor vehicles during the next two decades or so. These upcoming NOx reductions run a serious risk of slowing or even reversing progress on ozone.
These data show that the IPN locations do a good job of representing national trends. 7 Once again, areas with the highest levels achieved the greatest improvements. The appendix to this chapter on page 209 provides data on state-by-state trends for this period. 5 levels between 1999 and 2006, with declines occurring at 93 percent of the monitoring sites with continuous data. 5 levels between 1999 and 2006. 5 during the 1980s and ’90s also demonstrate ongoing improvements. 5 standard (all but one monitoring location as of the end of 2006).
The average location complies with the standard in nearly all states, and most violating sites are relatively close to the standard. 5 were in a class by themselves until the last couple of years. 5 levels. 5 levels. html (accessed September 29, 2006). NOTES: The upper horizontal line marks the current federal standard of 65 µg/m3. The lower horizontal line marks the proposed new standard of 35 µg/m3. 5 are based on the ninety-eighth percentile of 24-hour values for each year (roughly the seventh-highest daily reading each year), which is how compliance with the federal standard is determined.
Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks by Joel M. Schwartz, Steven F. Hayward