SmogRank / France / Pays de la Loire / Nantes

Nantes, month by month

Nantes has a measured daily mean on 481 days since 11 January 2023. Its worst month was February 2023, at 66 US AQI (17.1 µg/m³), 233rd of 1,129 cities on that month's world ranking. Its cleanest was July 2023, at 29 US AQI (5.2 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)44 days measured
Jan4 daysFebnoneMarnoneAprnoneMay4 daysJun3 daysJul10 daysAug5 daysSep10 daysOct8 days
2025too few days for a mean (a year needs 256)4 days measured
Jan4 daysFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)128 days measured
Jan60#528Feb43#1,168Mar15 daysApr36#1,583May32#2,105JunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDec1 day
202351 for the year305 days measured647th of 1,355 in the world
Jan8 daysFeb66#233Mar54#207Apr46#777May44#958Jun49#979Jul29#1,204Aug15 daysSep20 daysOct37#1,264Nov53#600Dec53#644
Each square is a month's mean PM2.5 in US AQI from Nantes'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 Nantes marked; each year, the year's.
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

33 months
MonthWhy
Oct 20268 of 12 days measured; a month needs 9. The others: 4 with readings for part of the day (a day needs 18 hours).
Sep 202610 of 30 days measured; a month needs 21. The others: 20 with readings for part of the day (a day needs 18 hours).
Aug 20265 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jul 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Jun 20263 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
May 20264 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Apr 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 20264 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2025No day measured. The others: 31 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 20254 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Dec 20241 of 31 days measured; a month needs 22. The others: 30 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.
Mar 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Sep 202320 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Aug 202315 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Jan 20238 of 31 days measured; a month needs 22. The others: 13 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.

Nantes's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2023 6617.1 µg/m³28 of 28233rdof 1,129Europe, 28 February to 4 March 2023
Europe, 6 to 25 February 2023
January 2024 6014.1 µg/m³29 of 31528thof 2,385Europe, 8 to 27 January 2024
Western Europe, January 2024
March 2023 5410.8 µg/m³31 of 31207thof 911Europe, 28 February to 4 March 2023
December 2023 5310.3 µg/m³31 of 31644thof 2,247France, Spain and Germany, December 2023
France, Belgium and 2 more countries, November and December 2023
November 2023 5310.1 µg/m³30 of 30600thof 2,243France, Belgium and 2 more countries, November and December 2023
France, November 2023
June 2023 498.8 µg/m³30 of 30979thof 1,603–

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.

Nantes's worst days

DayUS AQIEpisode
9 Feb 2023 12946.8 µg/m³Europe, 6 to 25 February 2023
10 Feb 2023 12344.6 µg/m³Europe, 6 to 25 February 2023
14 Jan 2024 11440.6 µg/m³Europe, 8 to 27 January 2024
Western Europe, January 2024
3 Mar 2023 11340.3 µg/m³Europe, 28 February to 4 March 2023
11 Feb 2023 10235.9 µg/m³Europe, 6 to 25 February 2023
26 Nov 2023 9834.4 µg/m³France, November 2023
14 Feb 2023 9633.3 µg/m³Europe, 6 to 25 February 2023
16 Dec 2023 9231.1 µg/m³France, Spain and Germany, December 2023
13 Feb 2023 8929.7 µg/m³Europe, 6 to 25 February 2023
22 Jan 2023 8929.5 µg/m³France, The Netherlands and United Kingdom, January 2023

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, Nantes, France, 11 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fr/nantes/history (accessed 13 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.

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

Updated 2026-10-13 01:07 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).