SmogRank / Japan / Gifu / Kani
Kani, month by month
Kani has a measured daily mean on 868 days since 28 July 2023. Its worst month was April 2024, at 62 US AQI (15.1 µg/m³), 399th of 2,520 cities on that month's world ranking. Its cleanest was October 2025, at 39 US AQI (7.0 µg/m³).
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
13 months
| Month | Why |
|---|---|
| May 2025 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Feb 2024 | 14 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 14 with under 18 hours of readings or readings that failed our checks. |
| Jan 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 5 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 8 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 8 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 1 of 31 days measured; a month needs 22. The others: 3 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.
Kani's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| April 2024 | 6215.1 µg/m³ | 399thof 2,520 | Japan and South Korea, April 2024 |
| July 2025 | 5813.0 µg/m³ | 639thof 2,889 | Japan and South Korea, June and July 2025 |
| August 2025 | 5812.9 µg/m³ | 587thof 2,901 | Japan, 4 to 5 August 2025 |
| June 2025 | 5712.1 µg/m³ | 792ndof 2,508 | Japan and South Korea, June and July 2025 |
| July 2026 | 5611.6 µg/m³ | 974thof 2,784 | – |
| February 2026 | 5410.9 µg/m³ | 1,208thof 2,866 | – |
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.
Kani's worst days
| Day | US AQI | Episode |
|---|---|---|
| 19 Apr 2024 | 11039.1 µg/m³ | Japan and South Korea, April 2024 |
| 9 Jul 2025 | 9733.8 µg/m³ | Japan and South Korea, June and July 2025 |
| 18 Apr 2024 | 9130.7 µg/m³ | Japan and South Korea, April 2024 |
| 4 Jul 2024 | 8929.6 µg/m³ | – |
| 3 Jul 2025 | 8728.5 µg/m³ | Japan and South Korea, June and July 2025 |
| 20 Apr 2024 | 8426.8 µg/m³ | Japan and South Korea, April 2024 |
| 2 Jul 2025 | 8225.9 µg/m³ | Japan and South Korea, June and July 2025 |
| 5 Jul 2025 | 8225.5 µg/m³ | Japan and South Korea, June and July 2025 |
| 17 Apr 2024 | 8125.2 µg/m³ | Japan and South Korea, April 2024 |
| 4 Aug 2025 | 8125.0 µg/m³ | Japan, 4 to 5 August 2025 |
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, Kani, 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/kani/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.
Kani now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).