SmogRank / Spain / Madrid / Coslada
Coslada, month by month
Coslada has a measured daily mean on 922 days since 1 January 2023. Its worst month was September 2023, at 70 US AQI (19.2 µg/m³), 109th of 2,176 cities on that month's world ranking. Its cleanest was January 2026, at 32 US AQI (5.7 µg/m³). 2025 averaged 52 US AQI (9.9 µg/m³), against 55 US AQI (11.5 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
16 months
| Month | Why |
|---|---|
| Oct 2026 | 7 of 12 days measured; a month needs 9. The others: 2 with no readings from the monitors, 3 with readings for part of the day (a day needs 18 hours). |
| Aug 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. |
| Jul 2026 | 6 of 31 days measured; a month needs 22. The others: 25 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 | 8 of 28 days measured; a month needs 20. The others: 20 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 | 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. |
| May 2024 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 10 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Mar 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. |
| Jul 2023 | 19 of 31 days measured; a month needs 22. The others: 12 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.
Coslada's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2023 | 7019.2 µg/m³ | 109thof 2,176 | North-eastern Spain and France, September 2023 |
| June 2025 | 6617.2 µg/m³ | 306thof 2,508 | – |
| August 2025 | 6416.1 µg/m³ | 304thof 2,901 | Spain, Portugal and Andorra, August 2025 |
| December 2023 | 6215.0 µg/m³ | 283rdof 2,247 | Spain, France and 2 more countries, December 2023 to January 2024 |
| February 2025 | 5712.5 µg/m³ | 987thof 2,633 | – |
| February 2023 | 5712.4 µg/m³ | 517thof 1,129 | Spain, France and Portugal, February 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.
Coslada's worst days
| Day | US AQI | Episode |
|---|---|---|
| 4 Sept 2023 | 187107.0 µg/m³ | North-eastern Spain and France, September 2023 |
| 11 Sept 2023 | 184102.0 µg/m³ | – |
| 5 Mar 2025 | 16676.5 µg/m³ | – |
| 14 Feb 2025 | 15966.8 µg/m³ | – |
| 23 Oct 2023 | 15663.1 µg/m³ | – |
| 19 Aug 2025 | 12244.2 µg/m³ | Spain, Portugal and Andorra, August 2025 |
| 31 Oct 2024 | 12143.7 µg/m³ | Northern Spain, October 2024 |
| 3 Sept 2023 | 11842.4 µg/m³ | – |
| 2 Sept 2023 | 11741.9 µg/m³ | – |
| 22 Feb 2023 | 9130.6 µg/m³ | Spain, France and Portugal, February 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, Coslada, Spain, 1 Jan 2023 – 9 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/coslada/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.
Coslada 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).