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For people affected by smoke from the fires, please follow the following recommendations: 

https://www.wallonie.be/fr/actualites/incendie-dans-les-fagnes-ce-14-aout 

Area: Wallonia
Pollutant: PM10 (Particulate matter), PM2.5 (Particulate matter), O3 (Ozone), NO2 (Nitrogen dioxide), SO2 (Sulphur dioxide), CO (Carbon monoxide), BC (Black carbon)
Year: 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
Subject: Annual review

Below, the  annual activity report of the Air Quality monitoring networks in Wallonia in PDF version (only available in French):