By Joel M. Schwartz, Steven F. Hayward
This booklet files how a lot U.S. air caliber has more advantageous in fresh many years and provides through a long way the main exact photo to be had of continuous pollution difficulties and the way to handle them.
Read or Download Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks PDF
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Additional resources for Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks
5 value of 48 µg/m3 for 2003–5. 5 in future years. 5 data were becoming available as this book was going to press, and Logan’s ninety-eighth percentile level for 2006 was only 29 µg/m3. Trends in PM10 PM10 has been monitored since the late 1980s, although few sites have long-term data. Figure 3-5 on the following page displays the national trend in average annual PM10 levels. The heavy dotted line gives these levels for all sites that happened to be operating in a given year—a few hundred sites in the late 1980s, rising to about 1,500 in the mid-1990s, then dropping to about 1,000 today.
Steubenville, Ohio, went from 32 µg/m3 in the early 1980s down to 14 µg/m3 today—a reduction of 56 percent, or 18 µg/m3. 5 has continued to decline more recently as well. S. Environmental Protection Agency, Inhalable Particulate Network Report: Operation and Data Summary (Mass Concentrations Only), Volume I, April 1979–December 1982, by D. O. Hinton, J. M. Sune, J. C. Suggs, and W. F. S. Environmental Protection Agency, Inhalable Particulate Network Report: Data Summary (Mass Concentrations Only), Volume III, January 1983–December 1984, by D.
When the VOCto-NOx ratio is low, VOC reductions reduce ozone, but NOx reductions can actually increase it, or at least mute the effect of the VOC reductions (see the sidebar in this chapter for more on how this works). This appears to be happening in many cities around the country and suggests that regulators may need to rethink their strategies for achieving the additional reductions necessary to attain the 8-hour standard. ” NOx emissions decline by as much as 60 percent on weekends relative to weekdays, mainly due to much lower use of diesel vehicles on weekends.
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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