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O3 (ppb) PM2.5 (µg/m3) AQI AQI
Clow - Chigh (avg) Clow- Chigh (avg) Ilow - Ihigh Category
0-54 (8-hr) 0.0-12.0 (24-hr) 0-50 Good
55-70 (8-hr) 12.1-35.4 (24-hr) 51-100 Moderate
71-85 (8-hr) 35.5-55.4 (24-hr) 101-150 Unhealthy for Sensitive Groups
86-105 (8-hr) 55.5-150.4 (24-hr) 151-200 Unhealthy
106-200 (8-hr) 150.5-250.4 (24-hr) 201-300 Very Unhealthy
- 250.5-350.4 (24-hr) 301-400 Hazardous
*Source for table - wikipedia.org