By Joel M. Schwartz, Steven F. Hayward
This e-book files how a lot U.S. air caliber has more suitable in fresh a long time and provides by means of a long way the main exact photo 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
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. The slow progress of the ’90s occurred despite continued steady reductions in nitrogen oxides (NOx) and volatile organic compounds (VOC)—the two pollutants that help form ozone (see chapter 4 for detailed information on emissions trends).
NOTES: PM is measured here as dustfall—the amount of particulate matter falling on a given area over a given amount of time, measured in tons per square mile per month. 1960s (see figure 1-4 on page 18). These are the earliest sulfur dioxide data we were able to find. Declines were likely occurring even before this. The smokiness of eastern and midwestern American cities during the early to mid-1900s was associated with the burning of coal, which is also the source of the vast majority of sulfur dioxide emissions.
The violation rate remained low in 2006 as low ozone levels continued for a fourth consecutive year. We now turn to current ozone levels across the United States. The results we present below are based on analysis of data from 1,035 monitoring sites with valid data for 2004–6. Figure 2-3 on page 32 gives the range of exceedance days per year in each state for the 8-hour and 1-hour standards. The diamond marks the average level for all monitors in a given state, while the vertical lines mark the range from worst to best monitoring site.
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