ATMO air quality index in the city of Paris 2011-2021

French ATMO air quality index for the city of Paris from 2011 to 2021, as a percentage of the number of days per level*

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Release date

October 2022



Survey time period

2011 to 2021

Supplementary notes

Figures have been rounded.

* The French index ATMO characterizes the daily air quality.
A new ATMO index was introduced in 2021. It accounts for sulfur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and fine dust (PM10 and PM2.5). Prior to 2021, the ATMO index did not include PM2.5 particles. The index is determined from the maximum daily concentration of SO2, NO2, and O3, and the average daily concentration of PM10 and PM2.5.
The scale of the new ATMO index is: extremely bad, very bad, bad, poor, average, good. The previous scale went from 1 (very good) to 10 (very bad).
While until 2020 the ATMO index gave an indication of the air quality for the whole Parisian agglomeration, the new ATMO index is computed for a municipality.
As of 2021, the ATMO index displayed in this statistic is calculated using the measurements of the air quality monitoring station of the 4th arrondissement of Paris.

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