SmogRank / Japan / Aomori / Aomori
Aomori, month by month
Aomori has a measured daily mean on 1,124 days since 28 July 2023. Its worst month was April 2024, at 59 US AQI (13.2 µg/m³), 567th of 2,520 cities on that month's world ranking. Its cleanest was January 2026, at 23 US AQI (4.2 µg/m³). 2025 averaged 40 US AQI (7.2 µg/m³), against 51 US AQI (9.1 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
2 months
| Month | Why |
|---|---|
| Aug 2023 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 2 of 31 days measured; a month needs 22. The others: 2 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.
Aomori's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| April 2024 | 5913.2 µg/m³ | 567thof 2,520 | – |
| March 2026 | 5712.5 µg/m³ | 1,124thof 2,971 | Japan and South Korea, March 2026 |
| May 2024 | 5611.7 µg/m³ | 510thof 2,684 | – |
| July 2024 | 5611.7 µg/m³ | 454thof 2,566 | Japan, 12 to 14 July 2024 |
| March 2024 | 5310.4 µg/m³ | 353rdof 1,698 | – |
| February 2024 | 5310.3 µg/m³ | 618thof 2,486 | Hokkaido and Aomori, Japan, February 2024 |
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.
Aomori's worst days
| Day | US AQI | Episode |
|---|---|---|
| 15 Sept 2026 | 12946.8 µg/m³ | – |
| 30 Mar 2026 | 11039.2 µg/m³ | Japan and South Korea, March 2026 |
| 29 Mar 2026 | 9432.3 µg/m³ | Japan and South Korea, March 2026 |
| 14 Jul 2024 | 9331.4 µg/m³ | Japan, 12 to 14 July 2024 |
| 14 Feb 2024 | 8929.7 µg/m³ | Hokkaido and Aomori, Japan, February 2024 |
| 14 Feb 2026 | 8829.0 µg/m³ | Japan, 14 to 15 February 2026 |
| 13 Jul 2024 | 8628.0 µg/m³ | Japan, 12 to 14 July 2024 |
| 24 Mar 2026 | 8326.5 µg/m³ | Japan and South Korea, March 2026 |
| 31 Mar 2026 | 8024.4 µg/m³ | Japan and South Korea, March 2026 |
| 27 Apr 2024 | 7924.3 µg/m³ | – |
Daily means, the highest since 28 Jul 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, Aomori, Japan, 28 Jul 2023 – 12 Oct 2026. Monitor data from Ministry of the Environment Air Pollutant Wide Area Monitoring System via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/jp/aomori/history (accessed 12 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.
Aomori now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).