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A climate that, in general, fosters the dispersal of air pollutants
Most of the time, Paris, which is on a plain, benefits from a windswept, wet, oceanic climate that sweeps and cleans the atmosphere, thus encouraging the dispersal of air pollution.
However, certain meteorological conditions (anticyclones and a lack of wind) can mean that the pollutants remain blocked in the atmosphere around the city, resulting, for the same levels of emissions, in significantly higher levels of pollution.
Thus, for equivalent pollutant emissions in terms of location and intensity, the levels of pollutants recorded in the atmosphere can vary by a factor of 20 according to meteorological conditions.
Mapping pollution
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Annual averages nitrogen dioxide (NO2)
in Ile-de-France of 2003 to 2008
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A number of days of going beyond of the qualitative aim of the air relating
to the protection of human health (120 µg/m3 on average over 8 hours)
out of ozone Comparison with the charts of 1999 to 2008
- background pollution -
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Annual averages sulfure dioxyde (SO2)
in Ile-de-France of 1999 to 2008
- background pollution -
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Annual averages benzene (C6H6)
in Ile-de-France of 2003 to 2008
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