SmogRank / Finland / South Karelia / Lappeenranta
Lappeenranta, month by month
Lappeenranta has a measured daily mean on 1,215 days since 1 January 2023. Its worst month was July 2025, at 51 US AQI (9.1 µg/m³), 1,493rd of 2,889 cities on that month's world ranking. Its cleanest was September 2026, at 22 US AQI (3.9 µg/m³). 2025 averaged 33 US AQI (5.9 µg/m³), against 27 US AQI (4.8 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
5 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 | 13 of 31 days measured; a month needs 22. The others: 18 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. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Lappeenranta's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2025 | 519.1 µg/m³ | 1,493rdof 2,889 | – |
| March 2026 | 468.3 µg/m³ | 2,060thof 2,971 | Europe, 1 to 12 March 2026 |
| February 2025 | 447.9 µg/m³ | 1,613thof 2,633 | – |
| February 2026 | 447.9 µg/m³ | 1,997thof 2,866 | – |
| March 2025 | 427.5 µg/m³ | 2,011thof 2,862 | – |
| January 2026 | 386.9 µg/m³ | 1,846thof 2,617 | – |
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.
Lappeenranta's worst days
| Day | US AQI | Episode |
|---|---|---|
| 12 Mar 2026 | 8427.0 µg/m³ | Europe, 1 to 12 March 2026 |
| 11 Mar 2026 | 8024.8 µg/m³ | Europe, 1 to 12 March 2026 |
| 24 Feb 2025 | 8024.7 µg/m³ | – |
| 31 May 2024 | 7421.2 µg/m³ | – |
| 16 Jan 2026 | 7220.3 µg/m³ | – |
| 5 Dec 2023 | 7019.2 µg/m³ | – |
| 22 Feb 2023 | 6918.5 µg/m³ | – |
| 3 Jan 2025 | 6717.8 µg/m³ | – |
| 24 Jul 2025 | 6717.5 µg/m³ | – |
| 25 Mar 2026 | 6717.5 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, Lappeenranta, Finland, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fi/lappeenranta/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.
Lappeenranta 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).