SmogRank / Italy / Lombardy / Milan
Milan, month by month
Milan has a measured daily mean on 470 days since 29 January 2024. Its worst month was February 2024, at 109 US AQI (38.9 µg/m³), 64th of 2,486 cities on that month's world ranking. Its cleanest was May 2024, at 44 US AQI (7.9 µg/m³).
Every month since 2024
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
22 months
| Month | Why |
|---|---|
| Oct 2026 | 5 of 11 days measured; a month needs 8. The others: 6 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 20 of 30 days measured; a month needs 21. The others: 10 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 | 4 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 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 2025 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Dec 2024 | No day measured. The others: 31 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 | 8 of 31 days measured; a month needs 22. The others: 23 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 | 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 2024 | 15 of 30 days measured; a month needs 21. The others: 15 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. |
| Jan 2024 | 3 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.
Milan's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2024 | 10938.9 µg/m³ | 64thof 2,486 | Italy, Switzerland and France, February 2024 |
| September 2026 | 6013.8 µg/m³ | 419thof 2,981 | – |
| April 2025 | 5812.8 µg/m³ | 677thof 2,951 | – |
| September 2025 | 5712.3 µg/m³ | 447thof 3,104 | – |
| August 2025 | 5612.0 µg/m³ | 768thof 2,901 | – |
| July 2024 | 5611.7 µg/m³ | 454thof 2,566 | – |
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.
Milan's worst days
| Day | US AQI | Episode |
|---|---|---|
| 19 Feb 2024 | 17083.2 µg/m³ | Italy, Switzerland and France, February 2024 |
| 20 Feb 2024 | 17083.2 µg/m³ | Italy, Switzerland and France, February 2024 |
| 17 Feb 2024 | 16880.1 µg/m³ | Italy, Switzerland and France, February 2024 |
| 18 Feb 2024 | 16777.9 µg/m³ | Italy, Switzerland and France, February 2024 |
| 6 Feb 2024 | 16170.4 µg/m³ | – |
| 16 Feb 2024 | 15865.9 µg/m³ | Italy, Switzerland and France, February 2024 |
| 2 Feb 2024 | 15662.0 µg/m³ | – |
| 22 Jan 2026 | 15357.8 µg/m³ | – |
| 15 Feb 2024 | 15156.1 µg/m³ | Italy, Switzerland and France, February 2024 |
| 30 Jan 2024 | 15055.2 µg/m³ | – |
Daily means, the highest since 29 Jan 2024; 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, Milan, Italy, 29 Jan 2024 – 7 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/it/milan/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.
Milan now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).