SmogRank / France / Hauts-de-France / Lille

Lille, month by month

Lille has a measured daily mean on 634 days since 1 January 2023. Its worst month was March 2026, at 66 US AQI (17.3 µg/m³), 698th of 2,971 cities on that month's world ranking. Its cleanest was September 2025, at 32 US AQI (5.8 µg/m³).

Every month since 2023

202652 so far254 days measured1,147th of 2,793 in the world
Jan58#879Feb46#1,912Mar66#698Apr52#1,081May51#957Jun18 daysJul43#1,939Aug37#2,249Sep33#1,780Oct48#845
2025too few days for a mean (a year needs 256)110 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAug9 daysSep32#2,193Oct20 daysNov52#1,067Dec58#905
2024too few days for a mean (a year needs 257)8 days measured
Jan8 daysFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
202354 for the year262 days measured393rd of 1,355 in the world
Jan14 daysFeb2 daysMar15 daysApr58#226May58#220Jun61#407Jul21 daysAug38#1,390Sep12 daysOct47#649Nov46#1,055Dec51#894
Each square is a month's mean PM2.5 in US AQI from Lille's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Lille marked; each year, the year's. A dashed square is the running month, so far.
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

Months without a mean, and why

27 months
MonthWhy
Jun 202618 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Oct 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Aug 20259 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2024No day measured. The others: 1 missing from OpenAQ's archive, 28 with under 18 hours of readings or readings that failed our checks.
Jan 20248 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Sep 202312 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jul 202321 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 9 with under 18 hours of readings or readings that failed our checks.
Mar 202315 of 31 days measured; a month needs 22. The others: 15 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks.
Feb 20232 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks.
Jan 202314 of 31 days measured; a month needs 22. The others: 7 missing from OpenAQ's archive, 10 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Lille's worst months

MonthUS AQIDays measuredWorld rankEpisode
March 2026 6617.3 µg/m³30 of 31698thof 2,971Europe, 18 to 25 March 2026
Europe, 1 to 12 March 2026
June 2023 6114.5 µg/m³25 of 30407thof 1,603–
January 2026 5812.9 µg/m³23 of 31879thof 2,617Europe, January and February 2026
Europe, December 2025 to January 2026
May 2023 5812.8 µg/m³31 of 31220thof 1,600–
April 2023 5812.7 µg/m³30 of 30226thof 1,622France, Belgium and Germany, April 2023
Europe, April 2023and 1 more
December 2025 5812.6 µg/m³29 of 31905thof 3,006Europe, December 2025 to January 2026

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Lille's worst days

DayUS AQIEpisode
7 Mar 2026 13950.8 µg/m³Europe, 1 to 12 March 2026
8 Mar 2026 13850.5 µg/m³Europe, 1 to 12 March 2026
26 Jan 2026 12846.6 µg/m³Europe, January and February 2026
14 Feb 2023 12745.9 µg/m³Europe, 6 to 25 February 2023
25 Jan 2023 12445.0 µg/m³France, The Netherlands and United Kingdom, January 2023
23 Mar 2026 11139.5 µg/m³Europe, 18 to 25 March 2026
20 Mar 2026 10637.7 µg/m³Europe, 18 to 25 March 2026
11 Jan 2024 9834.5 µg/m³Europe, 8 to 27 January 2024
9 Mar 2026 9834.5 µg/m³Europe, 1 to 12 March 2026
24 Mar 2026 9532.8 µg/m³Europe, 18 to 25 March 2026

Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Lille, France, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fr/lille/history (accessed 12 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.

Lille now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 21:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).