第2-1表 EPAの大気基準
出典：EPA
KEY: ppm=parts per million; ug/m=microgams per cubic meter. SOURCE; U.S. Environmental Protection Agency, Office of Air Quality Planning and Standerds. National Air Quality and Emissions Trends Report 1992 (Reserch Triangle Park, NC: 1993).
KEY: ppm=parts per million; ug/m=microgams per cubic meter.
SOURCE; U.S. Environmental Protection Agency, Office of Air Quality Planning and Standerds. National Air Quality and Emissions Trends Report 1992 (Reserch Triangle Park, NC: 1993).
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