SmogRank / Iceland / Capital Region / Reykjavík

Reykjavík, month by month

Reykjavík has a measured daily mean on 1,286 days since 3 January 2023. Its worst month was March 2023, at 52 US AQI (9.5 µg/m³), 296th of 911 cities on that month's world ranking. Its cleanest was August 2026, at 12 US AQI (2.1 µg/m³). 2025 averaged 22 US AQI (3.9 µg/m³), against 22 US AQI (4.0 µg/m³) in 2024.

Every month since 2023

202619 so far285 days measured2,780th of 2,798 in the world
Jan21#2,519Feb21#2,752Mar19#2,879Apr26#2,570May21#2,713Jun20#2,363Jul21#2,717Aug12#2,892Sep12#2,981Oct15#2,745
202522 for the year365 days measured2,638th of 2,681 in the world
Jan22#2,382Feb28#2,353Mar35#2,227Apr23#2,759May23#2,545Jun19#2,458Jul36#2,135Aug16#2,887Sep12#3,093Oct13#2,603Nov17#2,657Dec19#2,907
202422 for the year350 days measured2,048th of 2,097 in the world
Jan37#1,623Feb20#2,369Mar19#1,560Apr22#2,229May17#2,567Jun24#2,326Jul21#2,473Aug18#1,995Sep22#1,934Oct16#1,998Nov27#2,336Dec24#2,407
202327 for the year286 days measured1,270th of 1,355 in the world
Jan23#1,166Feb34#1,005Mar52#296Apr17#1,562May19 daysJun18 daysJul16 daysAug18#1,962Sep18#2,138Oct18 daysNov33#1,749Dec24#2,095
Each square is a month's mean PM2.5 in US AQI from Reykjavík'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 Reykjavík 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

4 months
MonthWhy
Oct 202318 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jul 202316 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jun 202318 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
May 202319 of 31 days measured; a month needs 22. The others: 12 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.

Reykjavík's worst months

MonthUS AQIDays measuredWorld rank
March 2023 529.5 µg/m³28 of 31296thof 911
January 2024 376.7 µg/m³25 of 311,623rdof 2,385
July 2025 366.5 µg/m³31 of 312,135thof 2,889
March 2025 356.3 µg/m³31 of 312,227thof 2,862
February 2023 346.1 µg/m³28 of 281,005thof 1,129
November 2023 335.9 µg/m³30 of 301,749thof 2,243

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.

Reykjavík's worst days

DayUS AQI
1 Jan 2024 16880.1 µg/m³
24 Mar 2023 16372.7 µg/m³
21 Mar 2023 15560.5 µg/m³
8 Nov 2023 12143.5 µg/m³
20 Jul 2025 10938.7 µg/m³
1 Jan 2026 9029.9 µg/m³
21 Jul 2025 8426.8 µg/m³
1 Jan 2025 7723.1 µg/m³
19 Jul 2025 7723.1 µg/m³
22 Mar 2023 7622.5 µg/m³

Daily means, the highest since 3 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, Reykjavík, Iceland, 3 Jan 2023 – 12 Oct 2026. Monitor data from EEA and Umhverfisstofnun, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/is/reykjavik/history (accessed 13 Oct 2026). Contains readings from Umhverfisstofnun (Environment Agency of Iceland), no reuse terms published.

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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.

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

Updated 2026-10-13 02:07 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).