(a) In Table 1.1 we see that 57 wt % of the listed pollutants are CO....
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(a) In Table 1.1 we see that 57 wt % of the listed pollutants are CO. Does it follow from that table that 57 percent of the air pollution problem in the United States is a CO problem? (b) The same table shows that 57 wt % of all the listed pollutants come from transportation (mostly automobiles). Does it follow that 57 percent of our national air pollution problem is an automotive problem? (c) If the answer to these questions is no, explain your answer. AIR POLLUTION CONTROL ENCINEERINO TABLE 1.1 National emissions estimates for 1997 (Values in millions of short tons/yr) Source category PM10 CO NO voc Pb 0.7 1.4 67.0 11.6 7.7 0.00052 Transportation Fuel combustion Industrial processes Miscellaneous 4.8 10.7 0.00050 0.0029 1.1 17.3 0.9 1.3 1.7 6.1 0.9 9.8 9.6 0.3 23.5 116% 0.0 0.8 Total 3.1 20.4 87.5 19.2 0.0039 Percentage of 1970 total 65% 78% 70% 1.7% PMe particulate matier, 10 or smaller, see Chupter 8. SO, =all sulfur oxides, mostly SO; see Chapter 11. CO carbon monoxide, see Chapter 15. NO, all nitrogen oxides, mastly NO and NO,. The imass ahown is based on all NO being convened to NO: this is referrod to as "NO, expeessed as N0,", see Chapter 12. VOC= volatile organic compounds; soe Chapter 10. Pb lead; see Chapter 15. No value is showa for PMg emissiont as a fraction of 1970 emissions because ao reliable estimate is available for PMa emissions in 1970. Forest fires are the most important of the "Miscellaneous" sources, for most pollutants. This table contains ao entry for O, which is a major pollutant, but which is almost entircly a sccondary pollutuat for which there are no major pritoary eamission sources. VOC are listed not because they are directly harmful to human health, but because they are a major primary precursor of secondary O. Source: Ref. 2. (a) In Table 1.1 we see that 57 wt % of the listed pollutants are CO. Does it follow from that table that 57 percent of the air pollution problem in the United States is a CO problem? (b) The same table shows that 57 wt % of all the listed pollutants come from transportation (mostly automobiles). Does it follow that 57 percent of our national air pollution problem is an automotive problem? (c) If the answer to these questions is no, explain your answer. AIR POLLUTION CONTROL ENCINEERINO TABLE 1.1 National emissions estimates for 1997 (Values in millions of short tons/yr) Source category PM10 CO NO voc Pb 0.7 1.4 67.0 11.6 7.7 0.00052 Transportation Fuel combustion Industrial processes Miscellaneous 4.8 10.7 0.00050 0.0029 1.1 17.3 0.9 1.3 1.7 6.1 0.9 9.8 9.6 0.3 23.5 116% 0.0 0.8 Total 3.1 20.4 87.5 19.2 0.0039 Percentage of 1970 total 65% 78% 70% 1.7% PMe particulate matier, 10 or smaller, see Chupter 8. SO, =all sulfur oxides, mostly SO; see Chapter 11. CO carbon monoxide, see Chapter 15. NO, all nitrogen oxides, mastly NO and NO,. The imass ahown is based on all NO being convened to NO: this is referrod to as "NO, expeessed as N0,", see Chapter 12. VOC= volatile organic compounds; soe Chapter 10. Pb lead; see Chapter 15. No value is showa for PMg emissiont as a fraction of 1970 emissions because ao reliable estimate is available for PMa emissions in 1970. Forest fires are the most important of the "Miscellaneous" sources, for most pollutants. This table contains ao entry for O, which is a major pollutant, but which is almost entircly a sccondary pollutuat for which there are no major pritoary eamission sources. VOC are listed not because they are directly harmful to human health, but because they are a major primary precursor of secondary O. Source: Ref. 2.
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