Downs · 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

1 µg/m³

PM2.5

5.2 µg/m³

PM10

2 µg/m³

Ozone

37.5 µg/m³

Nitrogen dioxide

1 µg/m³

Sulfur dioxide

0 µg/m³

Carbon monoxide

115 µg/m³

European AQI (separate scale)

1