SmogRank / Japan / Akita / Noshiro
Noshiro, month by month
Noshiro has a measured daily mean on 1,033 days since 28 July 2023. Its worst month was April 2024, at 55 US AQI (11.0 µg/m³), 866th of 2,520 cities on that month's world ranking. Its cleanest was December 2024, at 24 US AQI (4.4 µg/m³). 2025 averaged 42 US AQI (7.5 µg/m³), against 40 US AQI (7.2 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
6 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 11 with no readings from the monitor, 1 with under 18 hours of readings or readings that failed our checks. |
| Sep 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 3 of 31 days measured; a month needs 22. The others: 1 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.
Noshiro's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| April 2024 | 5511.0 µg/m³ | 866thof 2,520 | Japan and South Korea, April 2024 |
| March 2026 | 5410.9 µg/m³ | 1,446thof 2,971 | Japan and South Korea, March 2026 |
| July 2025 | 5310.2 µg/m³ | 1,223rdof 2,889 | – |
| July 2024 | 5310.1 µg/m³ | 712thof 2,566 | Japan, 12 to 14 July 2024 |
| April 2026 | 5310.0 µg/m³ | 950thof 2,941 | – |
| June 2025 | 519.3 µg/m³ | 1,512thof 2,508 | – |
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.
Noshiro's worst days
| Day | US AQI | Episode |
|---|---|---|
| 14 Feb 2026 | 9331.8 µg/m³ | Japan, 14 to 15 February 2026 |
| 18 Apr 2024 | 9030.2 µg/m³ | Japan and South Korea, April 2024 |
| 30 Mar 2026 | 8627.9 µg/m³ | Japan and South Korea, March 2026 |
| 14 Jul 2024 | 8527.5 µg/m³ | Japan, 12 to 14 July 2024 |
| 24 Mar 2026 | 8225.8 µg/m³ | Japan and South Korea, March 2026 |
| 26 Apr 2025 | 8024.5 µg/m³ | – |
| 3 Jul 2025 | 7823.6 µg/m³ | – |
| 29 Mar 2026 | 7823.6 µg/m³ | Japan and South Korea, March 2026 |
| 30 Mar 2024 | 7723.2 µg/m³ | – |
| 15 Feb 2026 | 7723.0 µg/m³ | Japan, 14 to 15 February 2026 |
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, Noshiro, Japan, 28 Jul 2023 – 16 Jul 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/noshiro/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.
Noshiro 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).