Saint Helena, St. Helena
Half Tree Hollow · Air quality
Wednesday, Oct 28 · Atlantic/St Helena
Half Tree Hollow 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
- 2 µg/m³
- PM2.5
- 11 µg/m³
- PM10
- 19 µg/m³
- Ozone
- 43 µg/m³
- Nitrogen dioxide
- 0 µg/m³
- Sulfur dioxide
- 0 µg/m³
- Carbon monoxide
- 68 µg/m³
- European AQI (separate scale)
- 2