SmogRank / Spain / Canary Islands / San Isidro
San Isidro, month by month
San Isidro has a measured daily mean on 758 days since 1 January 2023. Its worst month was April 2023, at 68 US AQI (18.1 µg/m³), 133rd of 1,622 cities on that month's world ranking. Its cleanest was September 2023, at 24 US AQI (4.4 µg/m³). 2025 averaged 52 US AQI (9.5 µg/m³), against 54 US AQI (10.6 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
23 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 11 with no readings from the monitor. |
| Sep 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | No day measured. The others: 31 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 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 3 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Jul 2025 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Nov 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | No day measured. The others: 31 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 | 4 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Jul 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. |
| Mar 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. |
| Aug 2023 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 14 of 31 days measured; a month needs 22. The others: 17 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.
San Isidro's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| April 2023 | 6818.1 µg/m³ | 133rdof 1,622 | Canary Islands, Spain, April 2023 |
| February 2024 | 6617.1 µg/m³ | 279thof 2,486 | Canary Islands, Spain, 18 to 19 February 2024 Canary Islands, Spain, 14 February 2024and 2 more |
| December 2024 | 6617.1 µg/m³ | 380thof 2,616 | Canary Islands, Spain, December 2024 |
| February 2023 | 6617.0 µg/m³ | 240thof 1,129 | Canary Islands, Spain, 20 to 22 February 2023 Canary Islands, Spain, 12 to 15 February 2023 |
| January 2024 | 6315.6 µg/m³ | 428thof 2,385 | Canary Islands, Spain, 25 to 30 January 2024 Canary Islands, Spain, 23 January 2024 |
| December 2023 | 6013.7 µg/m³ | 331stof 2,247 | Canary Islands, Spain, 16 to 17 December 2023 Canary Islands, Spain, 11 to 13 December 2023 |
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.
San Isidro's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Dec 2024 | 17284.9 µg/m³ | Canary Islands, Spain, December 2024 |
| 14 Feb 2023 | 16575.7 µg/m³ | Canary Islands, Spain, 12 to 15 February 2023 |
| 13 Feb 2023 | 16271.4 µg/m³ | Canary Islands, Spain, 12 to 15 February 2023 |
| 13 Dec 2023 | 15662.4 µg/m³ | Canary Islands, Spain, 11 to 13 December 2023 |
| 24 Nov 2025 | 14352.6 µg/m³ | Canary Islands, Spain, November 2025 |
| 8 Feb 2024 | 13549.4 µg/m³ | Canary Islands, Spain, 8 to 9 February 2024 |
| 18 Dec 2024 | 13448.7 µg/m³ | Canary Islands, Spain, December 2024 |
| 29 Jan 2024 | 13247.9 µg/m³ | Canary Islands, Spain, 25 to 30 January 2024 |
| 14 Feb 2024 | 12545.3 µg/m³ | Canary Islands, Spain, 14 February 2024 |
| 10 Apr 2023 | 12043.2 µg/m³ | Canary Islands, Spain, April 2023 |
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, San Isidro, Spain, 1 Jan 2023 – 3 Jan 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/san-isidro/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.
San Isidro now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 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).