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Source: Council on Environmental Quality, 1993, Environmental quality, 23rd Annual Report (Washington, D.C.: U.S. Government Printing Office [January]).

Notes: PMSA = Primary Metropolitan Statistical Area. PSI = Pollutant Standards Index. na = not applicable. The PSI index integrates information from many pollutants across an entire monitoring network into a single number which represents the worst daily air quality experienced in the urban area. Only carbon monoxide and ozone monitoring sites with adequate historical data are included in the PSI trend analysis above, except for Pittsburgh, where sulfur dioxide contributes a significant number of days in the PSI high range. PSI index ranges and health effect descriptor words are as follows: 0 to 50 (good); 51 to 100 (moderate); 101 to 199 (unhealth-ful); 200 to 299 (very unhealthful); and 300 and above (hazardous). The table shows the number of days when the PSI was greater than 100 (= unhealthy or worse days).

Source: Council on Environmental Quality, 1993, Environmental quality, 23rd Annual Report (Washington, D.C.: U.S. Government Printing Office [January]).

Notes: PMSA = Primary Metropolitan Statistical Area. PSI = Pollutant Standards Index. na = not applicable. The PSI index integrates information from many pollutants across an entire monitoring network into a single number which represents the worst daily air quality experienced in the urban area. Only carbon monoxide and ozone monitoring sites with adequate historical data are included in the PSI trend analysis above, except for Pittsburgh, where sulfur dioxide contributes a significant number of days in the PSI high range. PSI index ranges and health effect descriptor words are as follows: 0 to 50 (good); 51 to 100 (moderate); 101 to 199 (unhealth-ful); 200 to 299 (very unhealthful); and 300 and above (hazardous). The table shows the number of days when the PSI was greater than 100 (= unhealthy or worse days).

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