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WHO Air quality guidelines (AQG) in Europe

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:
 www.who.int/phe/health_topics/outdoorair_aqg/en/
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.  
 Air Quality Guidelines for Europe, Second Edition

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