SmogRank / France / Normandy / Harfleur
Harfleur, month by month
Harfleur has a measured daily mean on 350 days since 16 September 2025. Its worst month was March 2026, at 64 US AQI (16.1 µg/m³), 757th of 2,971 cities on that month's world ranking. Its cleanest was September 2026, at 29 US AQI (5.2 µg/m³).
Every month since 2025
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
3 months
| Month | Why |
|---|---|
| Jun 2026 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Sep 2025 | 15 of 30 days measured; a month needs 21. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Harfleur's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2026 | 6416.1 µg/m³ | 757thof 2,971 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| December 2025 | 529.9 µg/m³ | 1,348thof 3,006 | – |
| May 2026 | 468.3 µg/m³ | 1,217thof 2,874 | – |
| April 2026 | 437.8 µg/m³ | 1,656thof 2,941 | – |
| July 2026 | 417.3 µg/m³ | 2,069thof 2,784 | – |
| January 2026 | 366.4 µg/m³ | 1,995thof 2,617 | – |
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.
Harfleur's worst days
| Day | US AQI | Episode |
|---|---|---|
| 8 Mar 2026 | 14954.9 µg/m³ | Europe, 1 to 12 March 2026 |
| 20 Mar 2026 | 11541.1 µg/m³ | Europe, 18 to 25 March 2026 |
| 23 Mar 2026 | 10938.7 µg/m³ | Europe, 18 to 25 March 2026 |
| 7 Mar 2026 | 9532.7 µg/m³ | Europe, 1 to 12 March 2026 |
| 24 Mar 2026 | 8527.4 µg/m³ | Europe, 18 to 25 March 2026 |
| 22 Mar 2026 | 8427.0 µg/m³ | Europe, 18 to 25 March 2026 |
| 6 Mar 2026 | 8326.3 µg/m³ | Europe, 1 to 12 March 2026 |
| 9 Mar 2026 | 8225.7 µg/m³ | Europe, 1 to 12 March 2026 |
| 27 Dec 2025 | 8024.4 µg/m³ | – |
| 26 Dec 2025 | 7924.1 µg/m³ | – |
Daily means, the highest since 16 Sept 2025; 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, Harfleur, France, 16 Sep 2025 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fr/harfleur/history (accessed 12 Oct 2026).
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.
Harfleur now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).