SmogRank / Spain / Basque Country / Oria
Oria, month by month
Oria has a measured daily mean on 891 days since 11 January 2023. Its worst month was February 2023, at 67 US AQI (17.9 µg/m³), 198th of 1,129 cities on that month's world ranking. Its cleanest was May 2024, at 33 US AQI (5.9 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
18 months
| Month | Why |
|---|---|
| Oct 2024 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | 12 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Jan 2024 | 3 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 7 of 31 days measured; a month needs 22. The others: 14 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.
Oria's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2023 | 6717.9 µg/m³ | 198thof 1,129 | Spain, France and Portugal, February 2023 |
| June 2025 | 5812.7 µg/m³ | 779thof 3,112 | Basque Country and Castille and León, Spain, June 2025 |
| May 2025 | 5712.1 µg/m³ | 585thof 3,125 | – |
| March 2025 | 5611.7 µg/m³ | 1,435thof 3,102 | – |
| August 2025 | 5611.6 µg/m³ | 886thof 3,095 | – |
| February 2025 | 5511.0 µg/m³ | 1,265thof 2,852 | – |
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.
Oria's worst days
| Day | US AQI | Episode |
|---|---|---|
| 18 Feb 2023 | 9633.0 µg/m³ | Spain, France and Portugal, February 2023 |
| 5 Mar 2023 | 9331.7 µg/m³ | Europe, 4 to 7 March 2023 |
| 4 Mar 2023 | 9231.0 µg/m³ | Europe, 4 to 7 March 2023 |
| 4 Mar 2025 | 8527.3 µg/m³ | – |
| 22 Feb 2023 | 8426.9 µg/m³ | Spain, France and Portugal, February 2023 |
| 19 Feb 2023 | 8326.4 µg/m³ | Spain, France and Portugal, February 2023 |
| 20 Feb 2023 | 8326.3 µg/m³ | Spain, France and Portugal, February 2023 |
| 19 Dec 2024 | 8225.5 µg/m³ | – |
| 16 Aug 2025 | 8125.4 µg/m³ | – |
| 17 Feb 2023 | 7924.3 µg/m³ | Spain, France and Portugal, February 2023 |
Daily means, the highest since 11 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, Oria, Spain, 11 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/oria/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.
Oria now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 20:07 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).