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TABLE 46
Twenty-four Hour 98  Percentile PM  Concentrations, 1999-2001
2.5
3
(annual mean, rounded to nearest 0.1 µg/m )
3
USEPA 24-hour PM  standard - 65 µg/m
2.5
Station Name
1999
2000
2001
Mean
Port Huron
44.5
33.1
40.5
39
(at same site)
No data
35.9
Need more data
3
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NOTE: To be in attainment of  the NAAQS of  65 µg/m , the 3-year average of  the 98  percentile
24-hour concentration must be less than or equal to the standard, which appears to be the case.
Lead
The Port Huron air quality monitoring station does not
monitor for this pollutant.
53