San Mateo air quality
Updated 10/18 09:01
The data may not be up to date.
Current AQI
US EPA scale · observed at 09:00
51
ModerateUnusually sensitive people should limit prolonged outdoor exertion.
Pollutants
Current concentrations, µg/m³
| Pollutant | Concentration | Description |
|---|---|---|
| PM2.5 | 5,7 µg/m³ | Fine particles ≤ 2.5 µm |
| PM10 | 7,3 µg/m³ | Particles ≤ 10 µm |
| O₃ | 51 µg/m³ | Ozone |
| NO₂ | 4,1 µg/m³ | Nitrogen dioxide |
| SO₂ | 4,9 µg/m³ | Sulphur dioxide |
| CO | 304 µg/m³ | Carbon monoxide |
AQI, next 19 hours
Show data table
| Time | AQI | Level |
|---|---|---|
| 14:00 | 50 | Good |
| 15:00 | 50 | Good |
| 16:00 | 50 | Good |
| 17:00 | 50 | Good |
| 18:00 | 50 | Good |
| 19:00 | 50 | Good |
| 20:00 | 50 | Good |
| 21:00 | 50 | Good |
| 22:00 | 49 | Good |
| 23:00 | 48 | Good |
| 00:00 | 47 | Good |
| 01:00 | 45 | Good |
| 02:00 | 44 | Good |
| 03:00 | 42 | Good |
| 04:00 | 40 | Good |
| 05:00 | 38 | Good |
| 06:00 | 37 | Good |
| 07:00 | 35 | Good |
| 08:00 | 33 | Good |