SmogRank / Spain / Basque Country / Azpeitia
Azpeitia, month by month
Azpeitia has a measured daily mean on 865 days since 14 February 2023. Its worst month was January 2024, at 54 US AQI (10.9 µg/m³), 798th of 2,385 cities on that month's world ranking. Its cleanest was November 2025, at 31 US AQI (5.5 µg/m³).
Every month since 2023
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
19 months
| Month | Why |
|---|---|
| Oct 2026 | 5 of 12 days measured; a month needs 9. The others: 4 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Sep 2026 | 18 of 30 days measured; a month needs 21. The others: 4 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 14 of 31 days measured; a month needs 22. The others: 5 with no readings from the monitor, 12 with readings for part of the day (a day needs 18 hours). |
| Jul 2026 | 12 of 31 days measured; a month needs 22. The others: 4 with no readings from the monitor, 15 with readings for part of the day (a day needs 18 hours). |
| Jun 2026 | 5 of 30 days measured; a month needs 21. The others: 5 with no readings from the monitor, 20 with readings for part of the day (a day needs 18 hours). |
| May 2026 | 1 of 31 days measured; a month needs 22. The others: 14 with no readings from the monitor, 16 with readings for part of the day (a day needs 18 hours). |
| Apr 2026 | No day measured. The others: 25 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours). |
| Mar 2026 | No day measured. The others: 31 with no readings from the monitor. |
| Feb 2026 | 5 of 28 days measured; a month needs 20. The others: 22 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| Jan 2026 | 20 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 10 with readings for part of the day (a day needs 18 hours). |
| Oct 2024 | 11 of 31 days measured; a month needs 22. The others: 20 with readings for part of the day (a day needs 18 hours). |
| Sep 2024 | No day measured. The others: 30 with readings for part of the day (a day needs 18 hours). |
| Aug 2024 | 7 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 23 with readings for part of the day (a day needs 18 hours). |
| Jul 2024 | 13 of 31 days measured; a month needs 22. The others: 18 with readings for part of the day (a day needs 18 hours). |
| Jun 2024 | 14 of 30 days measured; a month needs 21. The others: 16 with readings for part of the day (a day needs 18 hours). |
| Mar 2024 | 15 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours). |
| Aug 2023 | 20 of 31 days measured; a month needs 22. The others: 2 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours). |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 13 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Azpeitia's worst months
| Month | US AQI | World rank |
|---|---|---|
| January 2024 | 5410.9 µg/m³ | 798thof 2,385 |
| June 2025 | 529.8 µg/m³ | 1,357thof 2,508 |
| December 2025 | 529.8 µg/m³ | 1,380thof 3,006 |
| February 2025 | 529.7 µg/m³ | 1,234thof 2,633 |
| December 2024 | 529.5 µg/m³ | 967thof 2,616 |
| August 2025 | 529.4 µg/m³ | 1,374thof 2,901 |
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.
Azpeitia's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Sept 2023 | 11842.4 µg/m³ | North-eastern Spain and France, September 2023 |
| 26 Oct 2023 | 8125.1 µg/m³ | – |
| 18 Dec 2024 | 7722.9 µg/m³ | – |
| 10 Jun 2025 | 7622.6 µg/m³ | – |
| 26 Jan 2024 | 7421.3 µg/m³ | – |
| 24 Jun 2023 | 7220.3 µg/m³ | – |
| 30 Dec 2025 | 7220.3 µg/m³ | – |
| 31 Mar 2023 | 7120.0 µg/m³ | – |
| 13 Dec 2025 | 7120.0 µg/m³ | – |
| 12 Aug 2025 | 7119.7 µg/m³ | – |
Daily means, the highest since 14 Feb 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, Azpeitia, Spain, 14 Feb 2023 – 9 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/azpeitia/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.
Azpeitia now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 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).