SmogRank / World / Belgium / Flanders / September 2026

Most polluted cities in Flanders, Belgium, September 2026

26 cities in Flanders, Belgium ranked by their average PM2.5 over the 30 days. Worst: Meulebeke at 9.5 µg/m³, #704 of 2,949 cities in the world. Cleanest: Beersel at 4.3. 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.

← Meulebeke 0% 0.75%0
Every city in Flanders, Belgium ranked for September 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. 1Meulebeke
    0%
  2. 2Zelzate
    0%
  3. 3Genk
    0%
  4. 4Houthalen
    0%
  5. 5Stabroek
    0%
  6. 5Roeselare
    0%
  7. 5Melsele
    0%
  8. 5Knokke-Heist
    0%
  9. 5Antwerp
    0%
  10. 10Gent
    0%
  11. 11Kortrijk
    0%
  12. 11Kapellen
    0%
  13. 11Damme
    0%
  14. 14Veurne
    0%
  15. 14Menen
    0%
  16. 14Mechelen
    0%
  17. 14Grimbergen
    0%
  18. 14Beveren
    0%
  19. 19Willebroek
    0%
  20. 20Hasselt
    0%
  21. 21Ertvelde
    0%
  22. 22Mol
    0%
  23. 23Zaventem
    0%
  24. 24Gingelom
    0%
  25. 25Aarschot
    0%
  26. 26Beersellow-cost sensors
    0%

Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.

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

All cities in the world, September 2026 · All cities in Belgium, September 2026 · Flanders now

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SmogRank, most polluted cities in Flanders, Belgium, PM2.5, September 2026, smogrank.com/be/region/flanders/history/2026-09 (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.