SmogRank / Japan / Yamanashi / Fuefuki

Fuefuki, month by month

Fuefuki has a measured daily mean on 260 days since 20 January 2026. Its worst month was July 2026, at 58 US AQI (13.0 µg/m³), 730th of 2,784 cities on that month's world ranking. Its cleanest was September 2026, at 28 US AQI (5.0 µg/m³).

Every month since 2026

202649 so far260 days measured1,483rd of 2,791 in the world
Jan9 daysFeb54#1,290Mar49#1,903Apr49#1,282May49#1,021Jun41#1,331Jul58#730Aug46#1,533Sep28#2,339Oct52#679
Each square is a month's mean PM2.5 in US AQI from Fuefuki's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Fuefuki marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

1 month
MonthWhy
Jan 20269 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.

Fuefuki's worst months

MonthUS AQIDays measuredWorld rankEpisode
July 2026 5813.0 µg/m³29 of 31730thof 2,784Japan and South Korea, July 2026
February 2026 5410.5 µg/m³28 of 281,290thof 2,866–
March 2026 498.9 µg/m³30 of 311,903rdof 2,971–
May 2026 498.9 µg/m³31 of 311,021stof 2,874–
April 2026 498.8 µg/m³30 of 301,282ndof 2,941–
August 2026 468.2 µg/m³31 of 311,533rdof 2,896–

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.

Fuefuki's worst days

DayUS AQIEpisode
23 Jul 2026 8225.9 µg/m³Japan and South Korea, July 2026
24 Jul 2026 8024.7 µg/m³Japan and South Korea, July 2026
16 Jul 2026 7924.2 µg/m³Japan and South Korea, July 2026
15 Jul 2026 7723.2 µg/m³–
17 Jul 2026 7220.6 µg/m³Japan and South Korea, July 2026
22 Jul 2026 7220.2 µg/m³Japan and South Korea, July 2026
1 Jul 2026 6918.9 µg/m³–
19 May 2026 6818.4 µg/m³–
1 Aug 2026 6818.0 µg/m³–
18 May 2026 6717.7 µg/m³–

Daily means, the highest since 20 Jan 2026; 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, Fuefuki, Japan, 20 Jan 2026 – 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/fuefuki/history (accessed 12 Oct 2026).

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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.

Fuefuki now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 19:07 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).