AQI value of index

Level of health concern

PM_2.5 (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