Air quality index
United States
Columns: C_{low} | C_{high} | I_{low} | I_{high} | Category
0 | 12.0 | 0 | 50 | Good | 12.1 | 35.4 | 51 | 100 | Moderate | 35.5 | 55.4 | 101 | 150 | Unhealthy for Sensitive Groups | 55.5 | 150.4 | 151 | 200 | Unhealthy | 150.5 | 250.4 | 201 | 300 | Very Unhealthy | 250.5 | 350.4 | 301 | 400 | Hazardous