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

By Joel M. Schwartz, Steven F. Hayward

ISBN-10: 0844771872

ISBN-13: 9780844771878

This publication files how a lot U.S. air caliber has enhanced in contemporary many years and provides through some distance the main exact photo on hand of constant pollution difficulties and the way to deal with them.

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

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3 As the graph shows, many metropolitan areas would currently be coming into attainment based on the current standard. 080 ppm, 43 percent of the nation’s metro areas would be out of attainment. 070 ppm, which is a likely level for EPA to choose. In other words, EPA is planning a vast expansion of the reach of the Clean Air Act, one that would turn nearly the entire nation into a “nonattainment” area. 070 ppm would likely be unattainable in much of the nation, even with a virtual elimination of all motor-vehicle and industrial emissions (see next section of this chapter for more on this).

And Less Air Pollution Air pollution continued to decline apace after passage of the CAA, with virtually the entire country attaining federal standards for nitrogen dioxide, sulfur dioxide, and lead by the mid-1980s, and for carbon monoxide by the mid-1990s. Today only a few percent of monitoring locations still violate federal standards for particulate matter under ten microns in diameter (PM10). Even for ozone, the most intransigent of the pollutants regulated under the CAA, the percentage of monitors failing EPA’s original “1-hour” ozone standard went from 80 percent in the late 1970s to about 6 percent at the end of 2005, while the national-average number of days per year exceeding the standard declined more than 95 percent.

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.

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Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks by Joel M. Schwartz, Steven F. Hayward

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