St. Louis air quality
Updated 05/10, 00:17
The data may not be up to date.
Current AQI
US EPA scale · observed at 00:00
52
ModerateUnusually sensitive people should limit prolonged outdoor exertion.
Pollutants
Current concentrations, µg/m³
| Pollutant | Concentration | Description |
|---|---|---|
| PM2.5 | 4,1 µg/m³ | Fine particles ≤ 2.5 µm |
| PM10 | 4,1 µg/m³ | Particles ≤ 10 µm |
| O₃ | 46 µg/m³ | Ozone |
| NO₂ | 10,9 µg/m³ | Nitrogen dioxide |
| SO₂ | 0,9 µg/m³ | Sulphur dioxide |
| CO | 162 µg/m³ | Carbon monoxide |