SmogRank / Sweden / Västerbotten / Umeå

Umeå, month by month

Umeå has a measured daily mean on 609 days since 1 January 2023. Its worst month was May 2024, at 46 US AQI (8.2 µg/m³), 1,238th of 2,684 cities on that month's world ranking. Its cleanest was November 2023, at 14 US AQI (2.6 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)77 days measured
JannoneFebnoneMarnoneApr17 daysMay22#2,649Jun22#2,300JulnoneAugnoneSep4 daysOct4 days
2025too few days for a mean (a year needs 256)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)192 days measured
Jan18#2,336Feb18#2,410Mar15 daysApr20 daysMay46#1,238Jun33#2,051Jul31#2,097Aug15 daysSepnoneOctnoneNovnoneDecnone
202326 for the year340 days measured1,287th of 1,355 in the world
Jan17#1,230Feb19#1,107Mar26#823Apr33#1,221May40#1,103Jun36#1,279Jul23#1,322Aug27#1,838Sep31#1,881Oct25#1,858Nov14#2,224Dec21#2,150
Each square is a month's mean PM2.5 in US AQI from Umeå'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 Umeå marked; each year, the year's.
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

27 months
MonthWhy
Oct 20264 of 11 days measured; a month needs 8. The others: 1 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours).
Sep 20264 of 30 days measured; a month needs 21. The others: 12 with readings for part of the day (a day needs 18 hours), 14 with under 18 hours of readings or readings that failed our checks.
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 202617 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured.
Nov 2025No day measured.
Oct 2025No day measured.
Sep 2025No day measured.
Aug 2025No day measured.
Jul 2025No day measured.
Jun 2025No day measured.
May 2025No day measured.
Apr 2025No day measured.
Mar 2025No day measured.
Feb 2025No day measured.
Jan 2025No day measured.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 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.
Apr 202420 of 30 days measured; a month needs 21. The others: 10 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.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Umeå's worst months

MonthUS AQIDays measuredWorld rank
May 2024 468.2 µg/m³26 of 311,238thof 2,684
May 2023 407.2 µg/m³30 of 311,103rdof 1,600
June 2023 366.4 µg/m³30 of 301,279thof 1,603
April 2023 335.9 µg/m³27 of 301,221stof 1,622
June 2024 335.9 µg/m³30 of 302,051stof 2,563
September 2023 315.6 µg/m³27 of 301,881stof 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.

Umeå's worst days

DayUS AQI
20 Sept 2023 7220.5 µg/m³
2 May 2023 7119.6 µg/m³
18 Oct 2023 6918.9 µg/m³
29 May 2024 6918.9 µg/m³
16 May 2023 6717.5 µg/m³
23 Oct 2023 6617.4 µg/m³
31 May 2024 6516.7 µg/m³
1 Jun 2024 6516.4 µg/m³
28 May 2024 6315.8 µg/m³
30 May 2024 6315.5 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, Umeå, Sweden, 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/se/umea/history (accessed 12 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.

Umeå 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).