Air quality

Carbon dioxide (CO₂) in ppm

TVOC (mg/m³)

HCHO (mg/m³)

Fine particles (PM_2.5) in µg/m³

Particulate matter (PM₁₀) in µg/m³

AQI

Good

400 - 600

0 - 0.3

0 - 0.1

0 - 50

0 - 54

0 - 50

Moderate

651 - 1500

0.3 - 1.0

>0.1 mg/m³

16 - 40

55 - 154

51 - 100

Unhealty for sensitive group

1501 - 2000

1.0 - 3.0

41 - 65

155 - 254

101 - 150

Unhealty

2001 - 2500

3.0 - 10.0

66 - 150

255 - 354

151 - 200

Very unhealty

2501 - 5000

>10.0

151 - 250

355 - 424

201 - 300

Hazardous

5001 - 15,000

251 - 500

425 - 604

301 - 500