By Joel M. Schwartz, Steven F. Hayward

This ebook records how a lot U.S. air caliber has enhanced in contemporary a long time and provides through some distance the main actual photograph to be had of constant pollution difficulties and the way to handle 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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Despite the large number of sites operating at any given time, few have operated continuously for long periods. Thus, we have broken up the trends into two periods: 1988–96 (62 sites; 30 states) and 1993–2004 (156 sites; 33 states). All regions of the country are represented, and the period of overlap suggests that both groups of sites are representative of trends in PM10 levels across the country. Figure 3-5 also shows more recent trends and a wider array of locations by including data for 441 sites that operated from 1999 to 2004.

On the other hand, a small number of areas of the country that had persistently high PM10 levels tended to add monitoring sites to provide more detailed information on PM10 levels within the region. html (accessed January 15, 2006). of sites in high-PM areas and their removal in low-PM areas creates a false appearance that PM10 was not declining. Figure 3-6 displays the trend in the percentage of monitoring sites that violate either the annual or 24-hour PM10 standard. Because violation of a standard is based on three years of data, the trend begins in the third year of a given period (for example, 1990 for the 1988–96 trend).

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. 5 readings for 2003–5 at each site and then calculating the average and range of these values for each state. the 2003–5 period. Note that virtually the entire nation attains the current 24-hour standard of 65 µg/m3, in most cases with plenty of room to spare.

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