Table 2 Global updated WHO Air Quality Guidelines
From: Air pollution and population health: a global challenge
Pollutants | Averaging time | AQG values (μg/m3) |
|---|---|---|
Particulate matter | ||
PM2.5 | 1 year | 10 |
24 h (99th percentile) | 25 | |
PM10 | 1 year | 20 |
24 h (99th percentile) | 50 | |
Ozone O3 | 8 h daily maximum | 100 |
Nitrogen dioxide NO2 | 1 year | 40 |
1 h | 100 | |
Sulfur dioxide SO2 | 24 h | 20 |
10 min | 500 | |