SmogRank / France / Brittany / Quimper

Quimper, month by month

Quimper has a measured daily mean on 593 days since 1 February 2024. Its worst month was March 2026, at 56 US AQI (11.8 µg/m³), 1,252nd of 2,971 cities on that month's world ranking. Its cleanest was August 2026, at 23 US AQI (4.2 µg/m³).

Every month since 2024

202639 so far235 days measured2,188th of 2,791 in the world
Jan54#1,035Feb40#2,189Mar56#1,252Apr41#1,785May41#1,507Jun8 daysJul37#2,269Aug23#2,825Sep24#2,633Oct25#2,322
202543 for the year287 days measured1,828th of 2,681 in the world
Jan21 daysFeb56#1,046Mar53#1,578Apr41#1,943May21 daysJun16 daysJul33#2,337Aug21 daysSep28#2,600Oct20 daysNov40#1,780Dec54#1,149
2024too few days for a mean (a year needs 257)71 days measured
JanFeb1 dayMarnoneAprnoneMaynoneJunnoneJulnoneAug9 daysSepnoneOct12 daysNov52#946Dec48#1,188
Each square is a month's mean PM2.5 in US AQI from Quimper'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 Quimper 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

15 months
MonthWhy
Jun 20268 of 30 days measured; a month needs 21. The others: 22 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 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jun 202516 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
May 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jan 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 202412 of 31 days measured; a month needs 22. The others: 19 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 20249 of 31 days measured; a month needs 22. The others: 22 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 20241 of 29 days measured; a month needs 21. The others: 28 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.

Quimper's worst months

MonthUS AQIDays measuredWorld rankEpisode
March 2026 5611.8 µg/m³31 of 311,252ndof 2,971Europe, 18 to 25 March 2026
February 2025 5611.6 µg/m³23 of 281,046thof 2,633–
December 2025 5410.9 µg/m³29 of 311,149thof 3,006–
January 2026 5410.5 µg/m³22 of 311,035thof 2,617France, January 2026
March 2025 5310.1 µg/m³26 of 311,578thof 2,862–
November 2024 529.5 µg/m³27 of 30946thof 2,624–

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.

Quimper's worst days

DayUS AQIEpisode
21 Mar 2026 11039.2 µg/m³Europe, 18 to 25 March 2026
20 Mar 2026 8226.0 µg/m³Europe, 18 to 25 March 2026
4 Jan 2026 8125.4 µg/m³France, January 2026
23 Mar 2026 8125.4 µg/m³Europe, 18 to 25 March 2026
17 Feb 2025 8024.4 µg/m³–
29 Dec 2025 8024.4 µg/m³–
24 Mar 2025 7924.0 µg/m³–
27 Dec 2025 7722.8 µg/m³–
5 Mar 2025 7421.6 µg/m³–
26 Dec 2025 7321.1 µg/m³–

Daily means, the highest since 1 Feb 2024; 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, Quimper, France, 1 Feb 2024 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fr/quimper/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.

Quimper 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).