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WHO Air Quality Guidelines for Europe aim to protect public health.
In general, the guidelines address single pollutants, whereas in real-life, exposure to mixtures of chemicals occur, with additive, synergistic or antagonistic effects. The guidelines are only tentative, although emissions should be reduced to the lowest achievable level.
| Compound | Guideline value | Averaging time |
The WHO published a global update of these guidelines in 2005:  |
||
| Ozone | 120 micrograms/ cubic meter (0.06 ppm) |
8 hours |
| Nitrogen dioxide | 200 micrograms/ cubic meter (0.11 ppm) |
1 hour |
| 40 to 50 micrograms/ cubic meter (0.021 to 0.026 ppm) |
annual | |
| Particulate matter | No guideline values were set for particulate matter because there is no evident threshold for effects on morbidity and mortality |
|
Source:
WHO Update and revision of the air quality guidelines for europe.
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