By Joel M. Schwartz, Steven F. Hayward
This booklet records how a lot U.S. air caliber has more suitable in contemporary a long time and provides via a ways the main actual photo to be had 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
W. Ellsaesser, “Trends in Air Pollution in the United States,” in The State of Humanity, ed. J. L. 7 NOTES: TSP stands for “total suspended particulates,” which was how PM was measured until regulators shifted their focus to PM10 in the mid-1980s. TSP is roughly equivalent to PM30. Dustfall is the amount of particulate matter settling out of the air over a given period of time, and was measured by putting collection boxes on the roofs of buildings. ” is the average of all sites operating during the given time period.
McMullen, “Trends in Urban Air Quality,” EOS 51 (1970): 468–75. 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.
Railroads switched from coal-fired steam locomotives to diesel. The adoption of alternating current and improvements in transformer technology allowed power plants to be located near coal mines rather than in cities, because electricity could now be efficiently transported via long-distance power lines. The market forces that caused these transformations were not driven by air quality concerns, but they nevertheless caused large declines in air pollution levels. Improvements in air quality are not unique.