SmogRank / World / France / Hauts-de-France / January 2026
Most people breathing unhealthy air in Hauts-de-France, France, January 2026
3 cities in Hauts-de-France, France measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 31 days. The most people breathing unhealthy air: Roubaix, France, about 4.33K on an average day. A city needs measurements on 70% of the days to be ranked.
About 8.08K people in these 3 cities breathed unhealthy air on an average day of January 2026.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
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 people breathing unhealthy air, PM2.5, January 2026, smogrank.com/fr/region/hauts-de-france/history/2026-01?by=people (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.