SmogRank / World / Belgium / Wallonia / March 2026

Most polluted cities in Wallonia, Belgium, March 2026

17 cities in Wallonia, Belgium ranked by their average PM2.5 over the 31 days. Worst: Mons at 14.7 µg/m³, #881 of 2,947 cities in the world. Cleanest: Vielsalm at 6.2. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Mons 10% 9%0
Every city in Wallonia, Belgium ranked for March 2026, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Mons
    10%
  2. 2Charleroi
    6%
  3. 3Rixensart
    3%
  4. 4Tournai
    3%
  5. 5Liège
    0%
  6. 6Flémalle-Haute
    0%
  7. 7Champion
    0%
  8. 8Jumet
    0%
  9. 9Namur
    0%
  10. 10Ans
    0%
  11. 11Couvin
    0%
  12. 12Hamois
    0%
  13. 12Bertrix
    0%
  14. 14Eupen
    0%
  15. 15Bastogne
    0%
  16. 16Habay-la-Vieille
    0%
  17. 17Vielsalm
    0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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SmogRank, most polluted cities in Wallonia, Belgium, PM2.5, March 2026, smogrank.com/be/region/wallonia/history/2026-03 (accessed 6 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.