SmogRank / France / Corsica / Ajaccio

Ajaccio, month by month

Ajaccio has a measured daily mean on 97 days since 26 June 2026. Its worst month was July 2026, at 57 US AQI (12.2 µg/m³), 865th of 2,784 cities on that month's world ranking. Its cleanest was September 2026, at 28 US AQI (5.0 µg/m³).

Every month since 2026

2026too few days for a mean (a year needs 200)97 days measured
JanFebMarAprMayJun5 daysJul57#865Aug54#736Sep28#2,339Oct6 days
Each square is a month's mean PM2.5 in US AQI from Ajaccio'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 Ajaccio 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

2 months
MonthWhy
Oct 20266 of 12 days measured; a month needs 9. The others: 4 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Jun 20265 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.

Ajaccio's worst months

MonthUS AQIDays measuredWorld rank
July 2026 5712.2 µg/m³31 of 31865thof 2,784
August 2026 5410.8 µg/m³30 of 31736thof 2,896
September 2026 285.0 µg/m³25 of 302,339thof 2,981

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.

Ajaccio's worst days

DayUS AQI
28 Aug 2026 9734.0 µg/m³
27 Aug 2026 9029.9 µg/m³
27 Jul 2026 7723.2 µg/m³
17 Jul 2026 6617.2 µg/m³
26 Jul 2026 6617.0 µg/m³
18 Jul 2026 6516.7 µg/m³
29 Jul 2026 6416.3 µg/m³
16 Jul 2026 6415.9 µg/m³
30 Jul 2026 6315.6 µg/m³
22 Jul 2026 6315.4 µg/m³

Daily means, the highest since 26 Jun 2026; 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, Ajaccio, France, 26 Jun 2026 – 6 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fr/ajaccio/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.

Ajaccio 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).