SmogRank / United Kingdom / England / Luton
Luton, month by month
Luton has a measured daily mean on 316 days since 30 March 2025. Its worst month was March 2026, at 56 US AQI (11.9 µg/m³), 1,234th of 2,971 cities on that month's world ranking. Its cleanest was September 2025, at 30 US AQI (5.4 µg/m³).
Every month since 2025
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
10 months
| Month | Why |
|---|---|
| Sep 2026 | 1 of 30 days measured; a month needs 21. The others: 29 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. |
| Nov 2025 | 12 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Oct 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. |
| 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 | 2 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.
Luton's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2026 | 5611.9 µg/m³ | 1,234thof 2,971 | Europe, 1 to 12 March 2026 |
| April 2025 | 5611.7 µg/m³ | 808thof 2,951 | France and United Kingdom, April 2025 United Kingdom and France, April 2025 |
| January 2026 | 498.8 µg/m³ | 1,289thof 2,617 | Europe, January and February 2026 |
| May 2025 | 478.4 µg/m³ | 1,227thof 2,826 | – |
| February 2026 | 448.0 µg/m³ | 1,977thof 2,866 | Europe, January and February 2026 |
| December 2025 | 447.9 µg/m³ | 1,872ndof 3,006 | – |
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.
Luton's worst days
| Day | US AQI | Episode |
|---|---|---|
| 9 Mar 2026 | 10537.0 µg/m³ | Europe, 1 to 12 March 2026 |
| 5 Mar 2026 | 9130.8 µg/m³ | Europe, 1 to 12 March 2026 |
| 26 Jan 2026 | 8527.5 µg/m³ | Europe, January and February 2026 |
| 27 Apr 2025 | 8225.9 µg/m³ | France and United Kingdom, April 2025 |
| 4 Apr 2025 | 8125.4 µg/m³ | United Kingdom and France, April 2025 |
| 20 Mar 2026 | 7722.8 µg/m³ | – |
| 24 Mar 2026 | 7622.5 µg/m³ | – |
| 6 Mar 2026 | 7622.4 µg/m³ | Europe, 1 to 12 March 2026 |
| 12 Apr 2025 | 7522.2 µg/m³ | – |
| 27 Jan 2026 | 7521.8 µg/m³ | Europe, January and February 2026 |
Daily means, the highest since 30 Mar 2025; 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, Luton, United Kingdom, 30 Mar 2025 – 11 Oct 2026. Monitor data from UK-AIR (Defra), read from the publisher; sources listed at smogrank.com/sources. smogrank.com/gb/luton/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.
Luton now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).