SmogRank / Japan / Kagoshima / Kanoya
Kanoya, month by month
Kanoya has a measured daily mean on 1,107 days since 28 July 2023. Its worst month was March 2025, at 57 US AQI (12.3 µg/m³), 1,193rd of 2,862 cities on that month's world ranking. Its cleanest was September 2023, at 26 US AQI (4.6 µg/m³). 2025 averaged 53 US AQI (10.0 µg/m³), against 52 US AQI (9.4 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
3 months
| Month | Why |
|---|---|
| Jul 2025 | 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 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 4 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.
Kanoya's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2025 | 5712.3 µg/m³ | 1,193rdof 2,862 | – |
| April 2025 | 5712.3 µg/m³ | 728thof 2,951 | – |
| November 2025 | 5712.3 µg/m³ | 738thof 2,715 | – |
| January 2025 | 5712.2 µg/m³ | 710thof 2,474 | Japan and South Korea, 17 to 24 January 2025 |
| March 2024 | 5611.8 µg/m³ | 262ndof 1,698 | – |
| August 2024 | 5611.6 µg/m³ | 379thof 2,010 | – |
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.
Kanoya's worst days
| Day | US AQI | Episode |
|---|---|---|
| 29 Mar 2026 | 9331.8 µg/m³ | Japan and South Korea, March 2026 |
| 23 Feb 2026 | 8829.2 µg/m³ | Japan, 23 February 2026 |
| 19 Apr 2024 | 8628.1 µg/m³ | Japan and South Korea, April 2024 |
| 24 Jan 2025 | 8226.0 µg/m³ | Japan and South Korea, 17 to 24 January 2025 |
| 28 Mar 2026 | 8024.6 µg/m³ | Japan and South Korea, March 2026 |
| 4 Aug 2024 | 7723.2 µg/m³ | – |
| 4 Sept 2024 | 7723.0 µg/m³ | – |
| 18 Apr 2024 | 7521.9 µg/m³ | Japan and South Korea, April 2024 |
| 8 May 2024 | 7421.7 µg/m³ | – |
| 16 Oct 2025 | 7421.3 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, Kanoya, 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/kanoya/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.
Kanoya 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).