Washington, United States
Castle Rock · Air quality
Tuesday, Oct 27 · America/Los Angeles
Castle Rock air quality
US air quality index
13Good
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
- 2 µg/m³
- PM2.5
- 3.4 µg/m³
- PM10
- 3 µg/m³
- Ozone
- 19.7 µg/m³
- Nitrogen dioxide
- 4.3 µg/m³
- Sulfur dioxide
- 0 µg/m³
- Carbon monoxide
- 142.3 µg/m³
- European AQI (separate scale)
- 1