SmogRank / Finland / Uusimaa / Hämeenkylä

Hämeenkylä, month by month

Hämeenkylä has a measured daily mean on 1,169 days since 1 January 2023. Its worst month was March 2026, at 46 US AQI (8.2 µg/m³), 2,091st of 2,971 cities on that month's world ranking. Its cleanest was December 2024, at 10 US AQI (1.8 µg/m³). 2025 averaged 24 US AQI (4.4 µg/m³), against 22 US AQI (3.9 µg/m³) in 2024.

Every month since 2023

202626 so far275 days measured2,679th of 2,793 in the world
Jan33#2,149Feb29#2,557Mar46#2,091Apr16#2,887May19#2,743Jun25#2,229Jul24#2,667Aug24#2,811Sep17#2,912Oct21#2,517
202524 for the year324 days measured2,604th of 2,681 in the world
Jan19#2,424Feb38#1,865Mar33#2,302Apr17#2,914May19#2,704Jun20 daysJul44#1,784Aug18#2,866Sep26#2,726Oct19#2,525Nov19#2,630Dec16#2,964
202422 for the year272 days measured2,054th of 2,097 in the world
Jan19#2,299Feb23#2,288Mar15 daysApr18#2,373May33#2,043Jun26#2,282Jul26#2,323Aug15 daysSepnoneOct12 daysNov12#2,609Dec10#2,610
202322 for the year298 days measured1,326th of 1,355 in the world
Jan21 daysFeb3 daysMar11 daysApr21#1,500May24#1,497Jun29#1,406Jul18#1,382Aug24#1,885Sep29#1,938Oct13#2,005Nov21#2,154Dec27#2,033
Each square is a month's mean PM2.5 in US AQI from Hämeenkylä's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Hämeenkylä marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

8 months
MonthWhy
Jun 202520 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 202412 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Mar 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20233 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive.
Jan 202321 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 4 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.

Hämeenkylä's worst months

MonthUS AQIDays measuredWorld rankEpisode
March 2026 468.2 µg/m³31 of 312,091stof 2,971Europe, 1 to 12 March 2026
July 2025 448.0 µg/m³31 of 311,784thof 2,889–
February 2025 386.9 µg/m³22 of 281,865thof 2,633Europe, 14 February to 1 March 2025
May 2024 335.9 µg/m³31 of 312,043rdof 2,684–
March 2025 335.9 µg/m³26 of 312,302ndof 2,862Europe, 14 February to 1 March 2025
January 2026 335.9 µg/m³29 of 312,149thof 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.

Hämeenkylä's worst days

DayUS AQIEpisode
24 Feb 2025 9633.4 µg/m³Europe, 14 February to 1 March 2025
11 Mar 2026 9532.9 µg/m³Europe, 1 to 12 March 2026
25 Mar 2026 8024.6 µg/m³–
12 Mar 2026 8024.4 µg/m³Europe, 1 to 12 March 2026
9 Mar 2026 7421.3 µg/m³Europe, 1 to 12 March 2026
23 Feb 2025 7220.2 µg/m³Europe, 14 February to 1 March 2025
19 Feb 2026 7019.5 µg/m³–
25 Mar 2025 7019.3 µg/m³–
16 Jan 2026 6818.4 µg/m³–
30 Mar 2025 6717.8 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, Hämeenkylä, 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/haemeenkylae/history (accessed 13 Oct 2026).

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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.

Hämeenkylä now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 23:07 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).