SmogRank / World / Belgium / Flanders / January 2026

Most polluted cities in Flanders, Belgium, January 2026

25 cities in Flanders, Belgium ranked by their average PM2.5 over the 31 days. Worst: Houthalen at 15.6 µg/m³, #729 of 2,593 cities in the world. Cleanest: Veurne at 10.7. 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.

← Houthalen 9% 9%0
Every city in Flanders, Belgium ranked for January 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. 1Houthalen
    9%
  2. 2Mol
    7%
  3. 3Hasselt
    5%
  4. 4Mechelen
    5%
  5. 5Meulebeke
    4%
  6. 6Melsele
    4%
  7. 7Willebroek
    4%
  8. 8Aarschot
    4%
  9. 9Zelzate
    4%
  10. 10Grimbergen
    4%
  11. 11Ertvelde
    4%
  12. 12Genk
    4%
  13. 12Antwerp
    4%
  14. 14Beveren
    4%
  15. 15Kapellen
    4%
  16. 15Damme
    4%
  17. 17Roeselare
    4%
  18. 17Gent
    4%
  19. 19Menen
    4%
  20. 20Knokke-Heist
    4%
  21. 21Zaventem
    4%
  22. 22Stabroek
    4%
  23. 22Kortrijk
    4%
  24. 24Gingelom
    4%
  25. 25Veurne
    4%
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 Flanders, Belgium, PM2.5, January 2026, smogrank.com/be/region/flanders/history/2026-01 (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.