Saint Louis County air quality
Updated 10/21 00:01
The data may not be up to date.
Current AQI
US EPA scale · observed at 00:00
58
ModerateUnusually sensitive people should limit prolonged outdoor exertion.
Pollutants
Current concentrations, µg/m³
| Pollutant | Concentration | Description |
|---|---|---|
| PM2.5 | 21,3 µg/m³ | Fine particles ≤ 2.5 µm |
| PM10 | 21,4 µg/m³ | Particles ≤ 10 µm |
| O₃ | 11 µg/m³ | Ozone |
| NO₂ | 70,5 µg/m³ | Nitrogen dioxide |
| SO₂ | 3,9 µg/m³ | Sulphur dioxide |
| CO | 322 µg/m³ | Carbon monoxide |
AQI, next 8 hours
Show data table
| Time | AQI | Level |
|---|---|---|
| 16:00 | 65 | Moderate |
| 17:00 | 65 | Moderate |
| 18:00 | 65 | Moderate |
| 19:00 | 65 | Moderate |
| 20:00 | 66 | Moderate |
| 21:00 | 68 | Moderate |
| 22:00 | 69 | Moderate |
| 23:00 | 72 | Moderate |