Flagstaff · Air quality

1. Good0–50Current category
2. Moderate51–100
3. E no good for sensitive people101–150
4. E no good for health151–200
5. E bad well well for health201–300
6. Dangerous301–500+

A higher US AQI indicates more air pollution and greater health concern. Categories and pollutant concentration units are different measures.

All pollutants

PM1

0 µg/m³

PM2.5

0.8 µg/m³

PM10

0 µg/m³

Ozone

34.9 µg/m³

Nitrogen dioxide

1.7 µg/m³

Sulfur dioxide

0 µg/m³

Carbon monoxide

100.3 µg/m³

European AQI (separate scale)

1