England, United Kingdom
Knowl Hill · Air quality
Friday, Oct 30 · Europe/London
Knowl Hill air quality
US air quality index
56Moderate
US EPA scale
- Good0–50
- Moderate51–100Current category
- 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
- 10 µg/m³
- PM2.5
- 12 µg/m³
- PM10
- 14 µg/m³
- Ozone
- 14.3 µg/m³
- Nitrogen dioxide
- 25 µg/m³
- Sulfur dioxide
- 4.3 µg/m³
- Carbon monoxide
- 218.3 µg/m³
- European AQI (separate scale)
- 2