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NO2: exceedance of air pollution thresholds in Île-de-France 2012-2021

Number of days when the concentration of nitrogen dioxide (NO2) in the air exceeded the information threshold or the alert threshold in Île-de-France from 2012 to 2021

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Release date

February 2021



Survey time period

2012 to 2016 ; 2020 to 2021

Supplementary notes

For nitrogen dioxide, the information threshold is set at 200 micrograms per cubic meter (µg / m3) of air, and the alert threshold at 400 µg / m3.

The information and alert procedure in the Île-de-France region in case of air pollution episode concerns and applies to four pollutants:
Sulfur dioxide (SO2)
Ozone (O3)
Nitrogen dioxide (NO2)
Particles (PM10)

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