SmogRank / Sweden / Gotland / Visby
Visby, month by month
Visby has a measured daily mean on 937 days since 1 January 2023. Its worst month was March 2026, at 61 US AQI (14.7 µg/m³), 877th of 2,971 cities on that month's world ranking. Its cleanest was October 2023, at 19 US AQI (3.5 µg/m³). 2025 averaged 41 US AQI (7.4 µg/m³), against 36 US AQI (6.5 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
15 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 2 with no readings from the monitors, 9 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 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 8 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| May 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. |
| Apr 2026 | 2 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 8 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 15 of 30 days measured; a month needs 21. The others: 15 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 | 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 | 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 2023 | 19 of 30 days measured; a month needs 21. The others: 11 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.
Visby's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2026 | 6114.7 µg/m³ | 877thof 2,971 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| February 2025 | 6013.9 µg/m³ | 925thof 2,633 | Europe, 14 February to 1 March 2025 |
| April 2023 | 5812.6 µg/m³ | 233rdof 1,622 | – |
| March 2025 | 5611.8 µg/m³ | 1,266thof 2,862 | Europe, March 2025 Germany, Poland and 25 more countries, March 2025and 1 more |
| January 2023 | 519.1 µg/m³ | 565thof 1,261 | – |
| February 2024 | 478.4 µg/m³ | 991stof 2,486 | Europe, February and March 2024 |
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.
Visby's worst days
| Day | US AQI | Episode |
|---|---|---|
| 23 Feb 2025 | 13348.3 µg/m³ | Europe, 14 February to 1 March 2025 |
| 11 Mar 2026 | 11239.8 µg/m³ | Europe, 1 to 12 March 2026 |
| 20 Jan 2026 | 11039.3 µg/m³ | Europe, January and February 2026 |
| 27 Jan 2023 | 11039.1 µg/m³ | – |
| 22 Feb 2025 | 10737.9 µg/m³ | Europe, 14 February to 1 March 2025 |
| 9 Mar 2026 | 10135.6 µg/m³ | Europe, 1 to 12 March 2026 |
| 23 Mar 2026 | 9834.2 µg/m³ | Europe, 18 to 25 March 2026 |
| 9 Feb 2023 | 9331.9 µg/m³ | – |
| 20 Apr 2023 | 9130.5 µg/m³ | – |
| 25 Mar 2025 | 9029.9 µg/m³ | Europe, March 2025 |
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, Visby, Sweden, 1 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/visby/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.
Visby 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).