SmogRank / World / Belgium / Flanders / 2026

Most polluted cities in Flanders, Belgium, 2026

27 cities in Flanders, Belgium ranked by their average PM2.5 so far (278 of 365 days); 27 above the WHO annual guideline (5.0 µg/m³). Worst: Meulebeke at 10.7 µg/m³, #862 of 2,745 cities in the world. Cleanest: Overijse at 7.5. 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.

← Overijse 4% 4%0
Every city in Flanders, Belgium ranked for 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. 1Overijselow-cost sensors
    4%
  2. 2Beersellow-cost sensors
    4%
  3. 3Houthalen
    2%
  4. 4Meulebeke
    2%
  5. 5Mechelen
    1%
  6. 6Willebroek
    1%
  7. 7Ertvelde
    1%
  8. 8Zelzate
    1%
  9. 9Melsele
    1%
  10. 10Gent
    1%
  11. 11Grimbergen
    1%
  12. 12Menen
    1%
  13. 13Beveren
    1%
  14. 14Roeselare
    1%
  15. 15Knokke-Heist
    1%
  16. 16Antwerp
    1%
  17. 17Damme
    1%
  18. 18Gingelom
    1%
  19. 19Kortrijk
    1%
  20. 20Kapellen
    1%
  21. 21Zaventem
    1%
  22. 22Aarschot
    1%
  23. 23Mol
    1%
  24. 24Hasselt
    0%
  25. 25Genk
    0%
  26. 26Stabroek
    0%
  27. 27Veurne
    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, 2026 · All cities in Belgium, 2026 · Flanders now

Use this board

SmogRank, most polluted cities in Flanders, Belgium, PM2.5, 2026 (so far), smogrank.com/be/region/flanders/history/2026 (accessed 6 Oct 2026).

Download top 10 (PNG)

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.