SmogRank / Sweden / Stockholm / Stockholm
Stockholm, month by month
Stockholm has a measured daily mean on 949 days since 11 January 2023. Its worst month was March 2026, at 49 US AQI (8.8 µg/m³), 1,927th of 2,971 cities on that month's world ranking. Its cleanest was October 2023, at 17 US AQI (3.1 µg/m³). 2025 averaged 31 US AQI (5.5 µg/m³), against 29 US AQI (5.2 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
17 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 12 with readings for part of the day (a day needs 18 hours). |
| Sep 2026 | No day measured. The others: 30 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Jun 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. |
| 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. |
| Jan 2026 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Dec 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. |
| Jun 2025 | 13 of 30 days measured; a month needs 21. The others: 17 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. |
| Oct 2024 | 11 of 31 days measured; a month needs 22. The others: 20 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 | 13 of 31 days measured; a month needs 22. The others: 18 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. |
| Apr 2023 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 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. |
| Jan 2023 | 7 of 31 days measured; a month needs 22. The others: 14 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.
Stockholm's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2026 | 498.8 µg/m³ | 1,927thof 2,971 | – |
| February 2025 | 468.2 µg/m³ | 1,526thof 2,633 | Europe, 14 February to 1 March 2025 |
| July 2025 | 427.5 µg/m³ | 1,887thof 2,889 | – |
| May 2023 | 397.1 µg/m³ | 1,122ndof 1,600 | – |
| May 2024 | 397.0 µg/m³ | 1,692ndof 2,684 | – |
| September 2023 | 386.8 µg/m³ | 1,574thof 2,176 | – |
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.
Stockholm's worst days
| Day | US AQI | Episode |
|---|---|---|
| 22 Feb 2025 | 8125.1 µg/m³ | Europe, 14 February to 1 March 2025 |
| 11 Mar 2026 | 7823.5 µg/m³ | – |
| 21 Feb 2025 | 7421.6 µg/m³ | Europe, 14 February to 1 March 2025 |
| 23 Feb 2025 | 7320.9 µg/m³ | Europe, 14 February to 1 March 2025 |
| 18 May 2026 | 7119.8 µg/m³ | – |
| 10 Mar 2026 | 7119.7 µg/m³ | – |
| 9 Mar 2026 | 6919.0 µg/m³ | – |
| 20 Jan 2026 | 6717.6 µg/m³ | – |
| 19 Mar 2026 | 6717.5 µg/m³ | – |
| 19 Jan 2026 | 6516.8 µg/m³ | – |
Daily means, the highest since 11 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, Stockholm, Sweden, 11 Jan 2023 – 2 Jul 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/se/stockholm/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.
Stockholm 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).