SmogRank / Japan / Gifu / Motosu

Motosu, month by month

Motosu has a measured daily mean on 480 days since 28 July 2023. Its worst month was April 2024, at 57 US AQI (12.2 µg/m³), 689th of 2,520 cities on that month's world ranking. Its cleanest was January 2024, at 19 US AQI (3.4 µg/m³).

Every month since 2023

202643 so far234 days measured1,913th of 2,798 in the world
JannoneFeb15 daysMar46#2,060Apr48#1,321May42#1,449Jun40#1,374Jul50#1,604Aug37#2,249Sep33#1,791Oct46#974
2025too few days for a mean (a year needs 256)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)189 days measured
Jan19#2,314Feb16 daysMar42#859Apr57#689May38#1,763Jun38#1,772Jul29#2,190AugnoneSepnoneOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)57 days measured
JanFebMarAprMayJunJul4 daysAug15 daysSepnoneOctnoneNov9 daysDec32#1,858
Each square is a month's mean PM2.5 in US AQI from Motosu'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 Motosu marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Unhealthy for 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

25 months
MonthWhy
Feb 202615 of 28 days measured; a month needs 20. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jan 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured.
Nov 2025No day measured.
Oct 2025No day measured.
Sep 2025No day measured.
Aug 2025No day measured.
Jul 2025No day measured.
Jun 2025No day measured.
May 2025No day measured.
Apr 2025No day measured.
Mar 2025No day measured.
Feb 2025No day measured.
Jan 2025No day measured.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 202416 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 12 with under 18 hours of readings or readings that failed our checks.
Nov 20239 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
Oct 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 202315 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Jul 20234 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.

Motosu's worst months

MonthUS AQIDays measuredWorld rankEpisode
April 2024 5712.2 µg/m³30 of 30689thof 2,520Japan and South Korea, April 2024
July 2026 509.0 µg/m³29 of 311,604thof 2,784–
April 2026 488.7 µg/m³30 of 301,321stof 2,941–
March 2026 468.3 µg/m³30 of 312,060thof 2,971–
March 2024 427.6 µg/m³29 of 31859thof 1,698–
May 2026 427.6 µg/m³31 of 311,449thof 2,874–

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.

Motosu's worst days

DayUS AQIEpisode
19 Apr 2024 10838.3 µg/m³Japan and South Korea, April 2024
18 Apr 2024 9935.0 µg/m³Japan and South Korea, April 2024
17 Apr 2024 8427.0 µg/m³Japan and South Korea, April 2024
29 Mar 2026 8024.8 µg/m³–
20 Apr 2024 7622.4 µg/m³Japan and South Korea, April 2024
22 Jul 2026 7119.6 µg/m³–
8 Dec 2023 7019.3 µg/m³–
31 Mar 2024 6818.3 µg/m³–
23 Feb 2026 6818.2 µg/m³–
30 Jun 2026 6818.1 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, Motosu, 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/motosu/history (accessed 13 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.

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

Updated 2026-10-13 04:07 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).