SmogRank / Sweden / Stockholm / Sollentuna

Sollentuna, month by month

Sollentuna has a measured daily mean on 993 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 October 2023, at 13 US AQI (2.3 µg/m³). 2025 averaged 24 US AQI (4.4 µg/m³), against 25 US AQI (4.5 µg/m³) in 2024.

Every month since 2023

2026too few days for a mean (a year needs 200)103 days measured
Jan16 daysFeb26#2,634Mar46#2,091Apr6 daysMay10 daysJun15 daysJul2 daysAugnoneSepnoneOctnone
202524 for the year289 days measured2,604th of 2,681 in the world
Jan19#2,416Feb38#1,889Mar41#2,035Apr24#2,696May17#2,761Jun18 daysJul29#2,571Aug16#2,887Sep23#2,920Oct21#2,448Nov20#2,610Dec9 days
202425 for the year262 days measured2,005th of 2,097 in the world
Jan21#2,268Feb29#2,055Mar15 daysApr23#2,189May34#1,978Jun23#2,355Jul19#2,491Aug15 daysSepnoneOct13 daysNov17#2,562Dec18#2,534
202326 for the year339 days measured1,287th of 1,355 in the world
Jan23#1,161Feb26#1,073Mar27#809Apr37#1,096May31#1,363Jun33#1,322Jul19#1,374Aug23#1,903Sep31#1,903Oct13#2,005Nov21#2,154Dec24#2,095
Each square is a month's mean PM2.5 in US AQI from Sollentuna'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 Sollentuna 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

14 months
MonthWhy
Oct 2026No day measured. The others: 1 with no readings from the monitors, 11 with readings for part of the day (a day needs 18 hours).
Sep 2026No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 20262 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Jun 202615 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks.
May 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Apr 20266 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jan 202616 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Dec 20259 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Jun 202518 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Oct 202413 of 31 days measured; a month needs 22. The others: 18 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.

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

Sollentuna's worst months

MonthUS AQIDays measuredWorld rank
March 2026 468.2 µg/m³28 of 312,091stof 2,971
March 2025 417.4 µg/m³23 of 312,035thof 2,862
February 2025 386.8 µg/m³25 of 281,889thof 2,633
April 2023 376.7 µg/m³27 of 301,096thof 1,622
May 2024 346.1 µg/m³29 of 311,978thof 2,684
June 2023 336.0 µg/m³30 of 301,322ndof 1,603

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.

Sollentuna's worst days

DayUS AQI
22 Feb 2025 7522.2 µg/m³
11 Mar 2026 7522.0 µg/m³
23 Feb 2025 7321.1 µg/m³
21 Feb 2025 6818.0 µg/m³
18 Mar 2023 6516.7 µg/m³
14 Jun 2023 6415.9 µg/m³
17 Jan 2026 6315.7 µg/m³
19 Mar 2026 6315.4 µg/m³
25 Mar 2025 6215.1 µg/m³
8 Mar 2026 6215.1 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, Sollentuna, 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/sollentuna/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.

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

Updated 2026-10-13 00:07 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).