By Joel M. Schwartz, Steven F. Hayward
This ebook records how a lot U.S. air caliber has better in fresh many years and offers through a ways the main actual photo to be had of continuous pollution difficulties and the way to deal with 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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Extra resources for Air Quality in America: A Dose of Reality on Air Pollution Levels, Trends, and Health Risks
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). Recent data nevertheless show that daily levels also continue to decline. The national average of ninety-eighth percentile readings declined 17 percent from 1999 to 2006. 5 levels. 5 levels declined an average of 45 percent between the early 1980s and 2006. EPA has also collected data specifically on sulfate PM. Sulfate PM is formed in the atmosphere from gaseous SO2 emissions, which come from burning coal for electricity.
The diamond marks the average level for all monitors in a given state, and the vertical line marks the range from worst to best monitoring site. html (accessed September 29, 2006). NOTES: The horizontal line marks the 15 µg/m3 federal standard. 5 readings for 2003–5 at each site and then calculating the average and range of these values for each state. 5 standard. The average location complies with the standard in nearly all states, and most violating sites are relatively close to the standard.
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 same processes that reduced smoke from coal-burning during the early 1900s to the 1960s likely also reduced sulfur dioxide. Why Did Air Quality Improve Before the Clean Air Act? 1 PPM IN LOS ANGELES, 1956–78 Clean Air Act Passed 350 300 Days per Year 250 200 150 Area-Wide 100 Azusa Burbank 50 Downtown LA 0 1954 1958 1962 1966 1970 1974 1978 Year SOURCES: “Area-wide” data are from H.