SmogRank / France / Hauts-de-France / Denain

Denain, month by month

Denain has a measured daily mean on 941 days since 11 January 2023. Its worst month was February 2025, at 73 US AQI (21.0 µg/m³), 488th of 2,633 cities on that month's world ranking. Its cleanest was September 2025, at 32 US AQI (5.7 µg/m³).

Every month since 2023

202652 so far245 days measured1,177th of 2,791 in the world
Jan56#928Feb18 daysMar69#653Apr52#1,081May52#842Jun18 daysJul47#1,768Aug37#2,212Sep32#1,884Oct45#965
202554 for the year298 days measured765th of 2,681 in the world
Jan60#559Feb73#488Mar66#758Apr58#659May20 daysJun18 daysJul38#2,041Aug43#1,882Sep32#2,242Oct19 daysNov48#1,364Dec56#974
2024too few days for a mean (a year needs 257)175 days measured
Jan61#520Feb42#1,305Mar10 daysApr2 daysMaynoneJun2 daysJul36#1,845Aug15 daysSepnoneOct13 daysNov56#588Dec57#635
2023too few days for a mean (a year needs 256)223 days measured
Jan5 daysFeb17 daysMar10 daysApr3 daysMay19 daysJun56#566Jul14 daysAug20 daysSep40#1,431Oct39#1,109Nov41#1,320Dec52#850
Each square is a month's mean PM2.5 in US AQI from Denain'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 Denain 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

19 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.
Feb 202618 of 28 days measured; a month needs 20. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jun 202518 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
May 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Oct 202413 of 31 days measured; a month needs 22. The others: 18 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 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Jun 20242 of 30 days measured; a month needs 21. The others: 28 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 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Mar 202410 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Aug 202320 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jul 202314 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 16 with under 18 hours of readings or readings that failed our checks.
May 202319 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Apr 20233 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Mar 202310 of 31 days measured; a month needs 22. The others: 10 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks.
Feb 202317 of 28 days measured; a month needs 20. The others: 8 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks.
Jan 20235 of 31 days measured; a month needs 22. The others: 2 missing from OpenAQ's archive, 14 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.

Denain's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2025 7321.0 µg/m³23 of 28488thof 2,633Europe, 14 February to 1 March 2025
Europe, 1 to 14 February 2025
March 2026 6918.5 µg/m³25 of 31653rdof 2,971Europe, 18 to 25 March 2026
Europe, 1 to 12 March 2026
March 2025 6617.2 µg/m³26 of 31758thof 2,862Europe, March 2025
Germany, Poland and 25 more countries, March 2025and 1 more
January 2024 6114.2 µg/m³29 of 31520thof 2,385Europe, 8 to 27 January 2024
January 2025 6013.9 µg/m³27 of 31559thof 2,474Germany, France and 19 more countries, January 2025
Europe, January 2025and 1 more
April 2025 5813.0 µg/m³28 of 30659thof 2,951–

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.

Denain's worst days

DayUS AQIEpisode
7 Mar 2026 15459.9 µg/m³Europe, 1 to 12 March 2026
25 Mar 2025 13449.0 µg/m³Europe, March 2025
23 Mar 2026 12746.1 µg/m³Europe, 18 to 25 March 2026
26 Jan 2026 12745.9 µg/m³Europe, January and February 2026
11 Mar 2025 12043.1 µg/m³Germany, Poland and 25 more countries, March 2025
10 Feb 2025 11641.4 µg/m³Europe, 1 to 14 February 2025
8 Mar 2026 11440.7 µg/m³Europe, 1 to 12 March 2026
15 Jan 2025 11139.5 µg/m³Germany, France and 19 more countries, January 2025
Europe, January 2025
20 Mar 2026 10938.6 µg/m³Europe, 18 to 25 March 2026
20 Jun 2023 10637.5 µg/m³–

Daily means, the highest since 11 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, Denain, France, 11 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/denain/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.

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

Updated 2026-10-12 19:07 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).