SmogRank / World / Europe / France / Hauts-de-France

Most polluted cities in Hauts-de-France, France

13 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Roubaix at 8.8 µg/m³, #821 in the world.

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.

Île-de-France: 6 measured citiesCentre-Val de Loire: 10 measured citiesNormandy: 10 measured citiesHauts-de-France: 13 measured citiesGrand Est: 10 measured citiesPays de la Loire#13 Arras: 5.3 µg/m³#12 Amiens: 5.8 µg/m³#11 Creil: 6.1 µg/m³#8 Douai: 6.4 µg/m³#9 Boulogne-sur-Mer: 6.4 µg/m³#10 Béthune: 6.4 µg/m³#7 Saint-Quentin: 6.7 µg/m³#6 Denain: 6.8 µg/m³#4 Lille: 7.0 µg/m³#5 Calais: 7.0 µg/m³#3 Dunkirk: 7.9 µg/m³#2 Valenciennes: 8.7 µg/m³#1 Roubaix: 8.8 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Roubaix 0% 0.75%0
Every measured city in Hauts-de-France, France, 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. 1Roubaix 0%
  2. 2Valenciennes 0%
  3. 3Dunkirk 0%
  4. 4Lille 0%
  5. 4Calais 0%
  6. 6Denain 0%
  7. 7Saint-Quentin 0%
  8. 8Douai 0%
  9. 8Boulogne-sur-Mer 0%
  10. 8Béthune 0%
  11. 11Creil 0%
  12. 12Amiens 0%
  13. 13Arras 0%
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

Estimated: cities without a monitor

Hauts-de-France cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Tourcoing≈ 10 µg/m³Moderate
Villeneuve-d'Ascq≈ 10 µg/m³Moderate
Compiègne≈ 7 µg/m³Good
Wattrelos≈ 10 µg/m³Moderate
Marcq-en-Barœul≈ 10 µg/m³Moderate
Lens≈ 9 µg/m³Good
Cambrai≈ 7 µg/m³Good
Liévin≈ 9 µg/m³Good
Maubeuge≈ 7 µg/m³Good
Soissons≈ 6 µg/m³Good
Lomme≈ 9 µg/m³Good
Laon≈ 6 µg/m³Good
Lambersart≈ 9 µg/m³Moderate
Armentières≈ 9 µg/m³Good
Abbeville≈ 7 µg/m³Good
Hénin-Beaumont≈ 9 µg/m³Good
Coudekerque-Branche≈ 8 µg/m³Good
Bruay-la-Buissière≈ 8 µg/m³Good
Saint-Pol-sur-Mer≈ 8 µg/m³Good
La Madeleine≈ 9 µg/m³Moderate
Hazebrouck≈ 8 µg/m³Good
Grande-Synthe≈ 8 µg/m³Good
Mons-en-Barœul≈ 10 µg/m³Moderate
Loos≈ 9 µg/m³Moderate
Croix≈ 10 µg/m³Moderate
Halluin≈ 10 µg/m³Moderate
Hem≈ 10 µg/m³Moderate
Nogent-sur-Oise≈ 7 µg/m³Good
Wasquehal≈ 10 µg/m³Moderate
Senlis≈ 7 µg/m³Good
Carvin≈ 9 µg/m³Good
Avion≈ 9 µg/m³Good
Ronchin≈ 8 µg/m³Good
Saint-Omer≈ 8 µg/m³Good
Saint-Amand-les-Eaux≈ 8 µg/m³Good
Sin-le-Noble≈ 9 µg/m³Good
Faches-Thumesnil≈ 8 µg/m³Good
Château-Thierry≈ 6 µg/m³Good
Haubourdin≈ 9 µg/m³Good
Crépy-en-Valois≈ 7 µg/m³Good

Bad-air episodes in Hauts-de-France

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

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SmogRank, most polluted cities in Hauts-de-France, France, PM2.5, last 30 days to 7 Oct 2026, 01:00 UTC, smogrank.com/fr/region/hauts-de-france?w=30d.

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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.

Updated 2026-10-07 01:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.