SmogRank / Iceland / Capital Region / Hafnarfjörður
Hafnarfjörður, month by month
Hafnarfjörður has a measured daily mean on 1,024 days since 1 January 2023. Its worst month was July 2025, at 56 US AQI (11.7 µg/m³), 894th of 2,889 cities on that month's world ranking. Its cleanest was February 2024, at 18 US AQI (3.2 µg/m³). 2025 averaged 46 US AQI (8.2 µg/m³), against 36 US AQI (6.4 µg/m³) in 2024.
Every month since 2023
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
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 7 with no readings from the monitors, 5 with readings left out by our checks. |
| Sep 2026 | No day measured. The others: 30 with readings left out by our checks. |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 1 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Mar 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 19 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.
Hafnarfjörður's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2025 | 5611.7 µg/m³ | 894thof 2,889 |
| December 2025 | 5410.8 µg/m³ | 1,172ndof 3,006 |
| November 2025 | 529.7 µg/m³ | 1,094thof 2,715 |
| January 2026 | 529.7 µg/m³ | 1,139thof 2,617 |
| April 2025 | 509.0 µg/m³ | 1,481stof 2,951 |
| May 2025 | 478.4 µg/m³ | 1,227thof 2,826 |
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.
Hafnarfjörður's worst days
| Day | US AQI |
|---|---|
| 20 Jul 2025 | 14452.9 µg/m³ |
| 21 Jul 2025 | 11943.0 µg/m³ |
| 1 Jan 2024 | 10135.7 µg/m³ |
| 1 Jan 2025 | 9331.7 µg/m³ |
| 22 Jul 2025 | 8226.0 µg/m³ |
| 13 Feb 2023 | 7823.4 µg/m³ |
| 1 Aug 2025 | 7722.8 µg/m³ |
| 27 Aug 2024 | 7321.0 µg/m³ |
| 24 Apr 2025 | 7220.6 µg/m³ |
| 1 Jan 2023 | 7220.5 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, Hafnarfjörður, Iceland, 1 Jan 2023 – 9 Apr 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/is/hafnarfjoerdur/history (accessed 13 Oct 2026).
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.
Hafnarfjörður 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).