SmogRank / France / Corsica / Bastia

Bastia, month by month

Bastia has a measured daily mean on 1,034 days since 1 January 2023. Its worst month was July 2026, at 54 US AQI (10.5 µg/m³), 1,237th of 2,784 cities on that month's world ranking. Its cleanest was September 2025, at 24 US AQI (4.3 µg/m³). 2025 averaged 34 US AQI (6.2 µg/m³), against 41 US AQI (7.4 µg/m³) in 2023.

Every month since 2023

202642 so far247 days measured2,056th of 2,798 in the world
Jan19 daysFeb28#2,604Mar48#1,950Apr36#2,046May33#1,943Jun18 daysJul54#1,237Aug53#807Sep33#1,834Oct29#2,043
202534 for the year271 days measured2,313th of 2,681 in the world
Jan19 daysFeb48#1,437Mar35#2,227Apr34#2,263May18 daysJun14 daysJul33#2,337Aug19 daysSep24#2,864Oct19 daysNov28#2,409Dec28#2,673
2024too few days for a mean (a year needs 257)170 days measured
Jan53#882Feb52#688Mar10 daysApr2 daysMaynoneJun2 daysJul46#1,275Aug15 daysSepnoneOct13 daysNov42#1,518Dec20 days
202341 for the year346 days measured995th of 1,355 in the world
Jan18 daysFeb50#734Mar38#632Apr36#1,145May36#1,238Jun46#1,060Jul53#654Aug39#1,289Sep44#1,121Oct46#703Nov26#2,030Dec37#1,678
Each square is a month's mean PM2.5 in US AQI from Bastia'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 Bastia 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

16 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.
Jan 202619 of 31 days measured; a month needs 22. The others: 12 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.
Aug 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 202514 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
May 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jan 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Dec 202420 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.
Jan 202318 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.

Bastia's worst months

MonthUS AQIDays measuredWorld rank
July 2026 5410.5 µg/m³31 of 311,237thof 2,784
August 2026 5310.4 µg/m³28 of 31807thof 2,896
July 2023 5310.1 µg/m³29 of 31654thof 1,432
January 2024 5310.0 µg/m³29 of 31882ndof 2,385
February 2024 529.8 µg/m³27 of 29688thof 2,486
February 2023 509.0 µg/m³27 of 28734thof 1,129

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.

Bastia's worst days

DayUS AQIEpisode
3 Jan 2024 14051.5 µg/m³–
4 Jan 2024 12243.9 µg/m³–
10 Feb 2024 11741.8 µg/m³–
4 Sept 2026 9331.7 µg/m³–
14 Jun 2025 8527.2 µg/m³Italy, France and 2 more countries, June 2025
11 Jun 2025 8125.1 µg/m³Europe, June 2025
28 Aug 2026 7521.9 µg/m³–
27 Jul 2026 7521.8 µg/m³–
6 Mar 2026 7019.1 µg/m³–
13 Jul 2023 6918.6 µg/m³–

Daily means, the highest since 1 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, Bastia, France, 1 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/bastia/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.

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

Updated 2026-10-13 00:07 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).