SmogRank / Spain / Basque Country / Zumarraga
Zumarraga, month by month
Zumarraga has a measured daily mean on 544 days since 29 January 2024. Its worst month was July 2025, at 57 US AQI (12.1 µg/m³), 811th of 2,889 cities on that month's world ranking. Its cleanest was March 2025, at 43 US AQI (7.8 µg/m³).
Every month since 2024
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
21 months
| Month | Why |
|---|---|
| Oct 2026 | 2 of 12 days measured; a month needs 9. The others: 3 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks. |
| Sep 2026 | 18 of 30 days measured; a month needs 21. The others: 12 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 16 of 31 days measured; a month needs 22. The others: 15 with readings for part of the day (a day needs 18 hours). |
| Jul 2026 | 14 of 31 days measured; a month needs 22. The others: 17 with readings for part of the day (a day needs 18 hours). |
| Jun 2026 | 4 of 30 days measured; a month needs 21. The others: 26 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: 10 with no readings from the monitor, 20 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: 19 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours). |
| Jan 2026 | 15 of 31 days measured; a month needs 22. The others: 16 with readings for part of the day (a day needs 18 hours). |
| Nov 2025 | 20 of 30 days measured; a month needs 21. The others: 10 with readings for part of the day (a day needs 18 hours). |
| Oct 2025 | 19 of 31 days measured; a month needs 22. The others: 12 with readings for part of the day (a day needs 18 hours). |
| Aug 2025 | 21 of 31 days measured; a month needs 22. The others: 2 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours). |
| Jun 2025 | 18 of 30 days measured; a month needs 21. The others: 12 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: 3 with no readings from the monitor, 27 with readings for part of the day (a day needs 18 hours). |
| Aug 2024 | 6 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 24 with readings for part of the day (a day needs 18 hours). |
| Jul 2024 | 12 of 31 days measured; a month needs 22. The others: 19 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). |
| Jan 2024 | 3 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Zumarraga's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2025 | 5712.1 µg/m³ | 811thof 2,889 |
| May 2025 | 5511.3 µg/m³ | 658thof 2,826 |
| November 2024 | 5511.1 µg/m³ | 683rdof 2,624 |
| February 2025 | 5410.9 µg/m³ | 1,103rdof 2,633 |
| December 2025 | 5410.5 µg/m³ | 1,232ndof 3,006 |
| September 2025 | 5310.0 µg/m³ | 690thof 3,104 |
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.
Zumarraga's worst days
| Day | US AQI | Episode |
|---|---|---|
| 13 Aug 2025 | 8728.4 µg/m³ | Spain, Portugal and Andorra, August 2025 |
| 21 Jun 2025 | 8125.0 µg/m³ | – |
| 10 Jun 2025 | 7823.5 µg/m³ | – |
| 7 Aug 2025 | 7723.1 µg/m³ | – |
| 9 Apr 2025 | 7421.6 µg/m³ | – |
| 7 Feb 2024 | 7421.5 µg/m³ | – |
| 31 Jan 2024 | 7321.0 µg/m³ | – |
| 16 Jul 2025 | 7321.0 µg/m³ | – |
| 29 Nov 2024 | 7320.8 µg/m³ | – |
| 24 Jun 2026 | 7220.4 µg/m³ | – |
Daily means, the highest since 29 Jan 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, Zumarraga, Spain, 29 Jan 2024 – 9 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/zumarraga/history (accessed 13 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.
Zumarraga now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 04:07 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).