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Real-Time Smoke
Particulate Sampling
Fire Storm 2000

Regional Air Quality (continued)

Pie chart showing the air quality levels for Missoula.
Figure 7—Air quality levels in Missoula, MT, from August 14 to 30, 2000.
The hazard categories are based on the U.S. Environmental
Protection Agency air quality index for particulate
matter smaller than 2.5 µg/m³.

Daily 24-h PM2.5 averages were calculated for Missoula and Hamilton (figure 8). The proposed 24-h EPA PM2.5 standard of 65 µg/m³ is shown in the graph. Hamilton exceeded this level 10 times from August 14 to 30, while Missoula exceeded the level 6 times from August 11 to September 1.

Bar graph showing the daily averages for Missoula and Hamilton.
Figure 8—The estimated 24-h (midnight to midnight) PM2.5
concentrations for Missoula and Hamilton, MT, from August 11 to
September 1, 2000. Results are from the corrected MIE
DataRam real-time particulate monitor.

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