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

Most unhealthy days in Hauts-de-France, France, January 2026

12 cities in Hauts-de-France, France ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Béthune, France, 1 of 22 measured days. 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.

← Béthune 5% 4%0
Every city in Hauts-de-France, France 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. 1Béthune
    1 of 22
  2. 2Calais
    1 of 22
  3. 3Roubaix
    1 of 23
  4. 4Dunkirk
    1 of 23
  5. 5Lille
    1 of 23
  6. 6Valenciennes
    1 of 23
  7. 7Denain
    1 of 23
  8. 8Boulogne-sur-Mer
    1 of 23
  9. 9Creil
    0 of 22
  10. 9Beauvais
    0 of 22
  11. 11Saint-Quentin
    0 of 22
  12. 12Amiens
    0 of 22
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, by unhealthy days, PM2.5, January 2026, smogrank.com/fr/region/hauts-de-france/history/2026-01?by=days (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.