| Pollutant | Permissible range |
| Ozone (O3) | 0.110 ppm (a maximum at one hour) |
| Sulfur dioxide (SO2) | 0.130 ppm (a maximum at 24 hours) |
| Nitrogen dioxide (NO2) | 0.210 ppm (a maximum at one hour) |
| Carbon monoxide (CO) | 11 ppm (average daily maximum 8 hours) |
| Particles PM 10 μm | 150 μg/m3 (maximum at 24 hours) |
| Particles PM 2.5 μm | 65 μg/m3 (maximum at 24 hours) |
| Particles PST | 260 μg/m3 (maximum at 24 hours) |