Massachusetts, United States
Ten Hills · Air quality
Saturday, Nov 7 · America/New York
Ten Hills air quality
US air quality index
21Good
US EPA scale
- Good0–50Current category
- Moderate51–100
- Unhealthy for sensitive groups101–150
- Unhealthy151–200
- Very unhealthy201–300
- Hazardous301–500+
A higher US AQI indicates more air pollution and greater health concern. Categories and pollutant concentration units are different measures.
Understand the EPA scaleAll pollutants
- PM1
- 14 µg/m³
- PM2.5
- 2.9 µg/m³
- PM10
- 14 µg/m³
- Ozone
- 22.2 µg/m³
- Nitrogen dioxide
- 39 µg/m³
- Sulfur dioxide
- 2 µg/m³
- Carbon monoxide
- 277 µg/m³
- European AQI (separate scale)
- 1