Islands, Hong Kong
Ma Wan · Air quality
Saturday, Oct 31 · Asia/Hong Kong
Ma Wan air quality
US air quality index
128Unhealthy for sensitive groups
US EPA scale
- Good0–50
- Moderate51–100
- Unhealthy for sensitive groups101–150Current category
- 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
- 37 µg/m³
- PM2.5
- 44 µg/m³
- PM10
- 49 µg/m³
- Ozone
- 23 µg/m³
- Nitrogen dioxide
- 79 µg/m³
- Sulfur dioxide
- 48 µg/m³
- Carbon monoxide
- 446 µg/m³
- European AQI (separate scale)
- 4