SmogRank / Sweden / Dalarna / Hedemora

Hedemora, month by month

Hedemora has a measured daily mean on 740 days since 29 January 2024. Its worst month was March 2025, at 52 US AQI (9.7 µg/m³), 1,646th of 2,862 cities on that month's world ranking. Its cleanest was August 2025, at 18 US AQI (3.2 µg/m³).

Every month since 2024

202627 so far230 days measured2,651st of 2,793 in the world

Jan14 daysFeb36#2,340 Mar47#2,003 Apr27#2,525 May19#2,743 Jun21#2,354 Jul24#2,667 Aug23#2,825Sep20 daysOct20#2,565

202527 for the year274 days measured2,543rd of 2,681 in the world

Jan19#2,416 Feb34#2,067 Mar52#1,646 Apr32#2,337 May18#2,711Jun20 daysJul38#2,023 Aug18#2,866 Sep23#2,920Oct20 daysNov20 daysDec8 days

2024too few days for a mean (a year needs 257)236 days measured

Jan3 daysFeb24#2,258Mar15 daysApr36#1,556 May38#1,737 Jun24#2,326 Jul19#2,491Aug14 daysSepnoneOct14 daysNov18#2,541 Dec24#2,407

Each square is a month's mean PM2.5 in US AQI from Hedemora'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 Hedemora 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

11 months

Month	Why
Sep 2026	20 of 30 days measured; a month needs 21. The others: 1 with no readings from the monitors, 9 with readings for part of the day (a day needs 18 hours).
Jan 2026	14 of 31 days measured; a month needs 22. The others: 14 with no readings from the monitors, 3 with readings for part of the day (a day needs 18 hours).
Dec 2025	8 of 31 days measured; a month needs 22. The others: 19 with no readings from the monitors, 4 with readings for part of the day (a day needs 18 hours).
Nov 2025	20 of 30 days measured; a month needs 21. The others: 10 with readings for part of the day (a day needs 18 hours).
Oct 2025	20 of 31 days measured; a month needs 22. The others: 11 with readings for part of the day (a day needs 18 hours).
Jun 2025	20 of 30 days measured; a month needs 21. The others: 10 with readings for part of the day (a day needs 18 hours).
Oct 2024	14 of 31 days measured; a month needs 22. The others: 17 with readings for part of the day (a day needs 18 hours).
Sep 2024	No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Aug 2024	14 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitors, 14 with readings for part of the day (a day needs 18 hours).
Mar 2024	15 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitors, 6 with readings for part of the day (a day needs 18 hours).
Jan 2024	3 of 31 days measured; a month needs 22.

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

Hedemora's worst months

Month	US AQI	Days measured	World rank	Episode
March 2025	529.7 µg/m³	25 of 31	1,646thof 2,862	–
March 2026	478.5 µg/m³	29 of 31	2,003rdof 2,971	Europe, 1 to 12 March 2026
May 2024	386.9 µg/m³	28 of 31	1,737thof 2,684	–
July 2025	386.9 µg/m³	29 of 31	2,023rdof 2,889	–
April 2024	366.5 µg/m³	26 of 30	1,556thof 2,520	–
February 2026	366.5 µg/m³	25 of 28	2,340thof 2,866	–

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.

Hedemora's worst days

Day	US AQI	Episode
28 Mar 2024	8125.3 µg/m³	–
10 Mar 2026	8125.3 µg/m³	Europe, 1 to 12 March 2026
7 Mar 2024	7823.7 µg/m³	–
18 Feb 2026	7723.1 µg/m³	–
5 Mar 2026	7521.8 µg/m³	Europe, 1 to 12 March 2026
14 Feb 2026	7119.9 µg/m³	–
2 Apr 2024	7119.6 µg/m³	–
19 Oct 2024	6617.0 µg/m³	–
8 Mar 2024	6516.6 µg/m³	–
25 May 2024	6416.0 µg/m³	–

Daily means, the highest since 29 Jan 2024; 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, Hedemora, Sweden, 29 Jan 2024 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/se/hedemora/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.

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

Updated 2026-10-12 22:07 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).