SmogRank / Finland / Uusimaa / Laaksolahti
Laaksolahti, month by month
Laaksolahti has a measured daily mean on 1,174 days since 1 January 2023. Its worst month was March 2025, at 56 US AQI (12.0 µg/m³), 1,242nd of 2,862 cities on that month's world ranking. Its cleanest was December 2024, at 15 US AQI (2.7 µg/m³). 2025 averaged 36 US AQI (6.4 µg/m³), against 31 US AQI (5.6 µg/m³) in 2024.
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
7 months
| Month | Why |
|---|---|
| Jun 2025 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Oct 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. |
| 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. |
| 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. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 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.
Laaksolahti's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2025 | 5612.0 µg/m³ | 1,242ndof 2,862 | Europe, 14 February to 1 March 2025 |
| March 2026 | 5611.9 µg/m³ | 1,234thof 2,971 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| July 2025 | 529.6 µg/m³ | 1,361stof 2,889 | – |
| January 2026 | 519.2 µg/m³ | 1,203rdof 2,617 | – |
| February 2025 | 498.9 µg/m³ | 1,367thof 2,633 | Europe, 14 February to 1 March 2025 |
| April 2023 | 498.8 µg/m³ | 653rdof 1,622 | – |
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.
Laaksolahti's worst days
| Day | US AQI | Episode |
|---|---|---|
| 24 Feb 2025 | 10537.1 µg/m³ | Europe, 14 February to 1 March 2025 |
| 11 Mar 2026 | 9834.3 µg/m³ | Europe, 1 to 12 March 2026 |
| 25 Mar 2026 | 8527.2 µg/m³ | Europe, 18 to 25 March 2026 |
| 7 Jan 2024 | 8426.6 µg/m³ | – |
| 31 Mar 2025 | 8426.6 µg/m³ | – |
| 12 Mar 2026 | 8125.4 µg/m³ | Europe, 1 to 12 March 2026 |
| 1 Jan 2026 | 8024.8 µg/m³ | – |
| 9 Mar 2026 | 7823.6 µg/m³ | Europe, 1 to 12 March 2026 |
| 25 Mar 2025 | 7823.4 µg/m³ | – |
| 30 Mar 2025 | 7521.8 µg/m³ | – |
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, Laaksolahti, Finland, 1 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fi/laaksolahti/history (accessed 13 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.
Laaksolahti now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 02:07 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).