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Forest Fire Smoke Categories and Breakpoints - Oregon.gov
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Forest Fire Smoke Categories and Breakpoints - Oregon.gov
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State of Oregon Department of Environmental Quality. Forest Fire Smoke Categories and Breakpoints. Air Quality. Rating.
State of Oregon Department of Environmental Quality
Forest Fire Smoke Categories and Breakpoints
PM2.5 8-hour Average Concentration (µg/m3)*
PM2.5 1-hour Average Concentration (µg/m3)*
5-3-1 Visibility Index (miles)
Air Quality Rating
AQI
PM2.5 24-hour Average Concentration (µg/m3)*
GOOD
0-50
0-12
0 – 22
0-38
15+
MODERATE
51-100
12-35
23-50
39-88
5-15
UNHEALTHY for Sensitive Groups (UFSG)
101-150
35-55
51-79
89-138
3-5
UNHEALTHY
151-200
55-150
80-200
139-351
2-3
VERY UNHEALTHY
201-300
150-250
201-300
352-526
1-2
HAZARDOUS
>300
>250
>300
>526
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