Razgrad, Bulgaria
Tsar Kaloyan · Air quality
Sunday, Nov 15 · Europe/Sofia
Tsar Kaloyan air quality
US air quality index
37Good
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
- 26 µg/m³
- PM2.5
- 28 µg/m³
- PM10
- 29 µg/m³
- Ozone
- 26 µg/m³
- Nitrogen dioxide
- 7.3 µg/m³
- Sulfur dioxide
- 1 µg/m³
- Carbon monoxide
- 270.7 µg/m³
- European AQI (separate scale)
- 1