SmogRank / Spain / Castille and León / Salamanca
Salamanca, month by month
Salamanca, Castille and León has a measured daily mean on 935 days since 1 January 2023. Its worst month was August 2025, at 62 US AQI (15.0 µg/m³), 355th of 2,901 cities on that month's world ranking. Its cleanest was April 2025, at 13 US AQI (2.3 µg/m³). 2025 averaged 37 US AQI (6.7 µg/m³), against 31 US AQI (5.5 µg/m³) in 2023.
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 | 6 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). |
| Sep 2026 | 14 of 30 days measured; a month needs 21. The others: 16 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 9 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Mar 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 8 of 28 days measured; a month needs 20. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 17 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Dec 2024 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 14 of 31 days measured; a month needs 22. The others: 17 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 | 6 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | 12 of 31 days measured; a month needs 22. The others: 19 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. |
| Oct 2023 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Aug 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. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Salamanca's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2025 | 6215.0 µg/m³ | 355thof 2,901 | Spain, Portugal and Andorra, August 2025 |
| January 2024 | 5712.4 µg/m³ | 660thof 2,385 | – |
| February 2023 | 5310.1 µg/m³ | 662ndof 1,129 | – |
| December 2025 | 5310.0 µg/m³ | 1,326thof 3,006 | – |
| November 2025 | 478.5 µg/m³ | 1,389thof 2,715 | – |
| January 2026 | 468.2 µg/m³ | 1,433rdof 2,617 | – |
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.
Salamanca's worst days
| Day | US AQI |
|---|---|
| 31 Dec 2025 | 18096.5 µg/m³ |
| 22 Jan 2024 | 17691.0 µg/m³ |
| 25 Jan 2024 | 17488.7 µg/m³ |
| 28 Nov 2024 | 16372.7 µg/m³ |
| 26 Dec 2024 | 15357.8 µg/m³ |
| 2 Feb 2026 | 14653.9 µg/m³ |
| 6 Sept 2023 | 14252.3 µg/m³ |
| 8 Jan 2024 | 13951.1 µg/m³ |
| 10 Nov 2025 | 13549.4 µg/m³ |
| 25 Jan 2026 | 13449.0 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, Salamanca, Castille and León, Spain, 1 Jan 2023 – 8 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/salamanca/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.
Salamanca 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).