AQI value of index | Level of health concern | PM2.5 (µg/m3) | PM10 (µg/m3) | Daily AQI colour | Pollution level |
0 to 50 | Good | 0 to 12 | 0 to 54 | GREEN | Level 1 |
51 to 100 | Moderate | 12.1 to 35.4 | 55 to 154 | YELLOW | Level 2 |
101 to 150 | Unhealthy for sensitive groups | 35.5 to 55.4 | 155 to 254 | ORANGE | Level 3 |
151 to 200 | Unhealthy | 55.5 to 150.4 | 255 to 354 | RED | Level 4 |
201 to 300 | Very unhealthy | 150.5 to 250.4 | 355 to 424 | PURPLE | Level 5 |
>300 | Hazardous | >250.4 | >424 | MAROON | Level 6 |