SmogRank / World / France / Hauts-de-France / March 2026

Most polluted cities in Hauts-de-France, France, March 2026

13 cities in Hauts-de-France, France ranked by their average PM2.5 over the 31 days. Worst: Calais at 20.1 µg/m³, #600 of 2,947 cities in the world. Cleanest: Saint-Quentin at 15.6. 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.

← Boulogne-sur-Mer 20% 15%0
Every city in Hauts-de-France, France 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. 1Boulogne-sur-Mer
    20%
  2. 2Roubaix
    17%
  3. 3Calais
    16%
  4. 4Denain
    16%
  5. 5Béthune
    14%
  6. 6Amiens
    13%
  7. 7Valenciennes
    13%
  8. 8Lille
    13%
  9. 9Douai
    13%
  10. 10Creil
    12%
  11. 11Dunkirk
    10%
  12. 12Beauvais
    10%
  13. 13Saint-Quentin
    7%
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 Hauts-de-France, France, PM2.5, March 2026, smogrank.com/fr/region/hauts-de-france/history/2026-03 (accessed 7 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.