SmogRank / Japan / Miyagi / Sakamoto
Sakamoto, month by month
Sakamoto has a measured daily mean on 835 days since 15 June 2024. Its worst month was July 2025, at 58 US AQI (12.8 µg/m³), 682nd of 2,889 cities on that month's world ranking. Its cleanest was January 2026, at 20 US AQI (3.6 µg/m³).
Every month since 2024
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
| Month | Why |
|---|---|
| Jun 2024 | 16 of 30 days measured; a month needs 21. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Sakamoto's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2025 | 5812.8 µg/m³ | 682ndof 2,889 | Japan and South Korea, June and July 2025 |
| March 2025 | 5310.3 µg/m³ | 1,545thof 2,862 | – |
| June 2025 | 5310.2 µg/m³ | 1,243rdof 2,508 | Japan and South Korea, June and July 2025 |
| May 2026 | 5310.1 µg/m³ | 753rdof 2,874 | – |
| March 2026 | 529.9 µg/m³ | 1,692ndof 2,971 | – |
| July 2026 | 529.9 µg/m³ | 1,385thof 2,784 | – |
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.
Sakamoto's worst days
| Day | US AQI | Episode |
|---|---|---|
| 9 Jul 2025 | 8627.8 µg/m³ | Japan and South Korea, June and July 2025 |
| 8 Jul 2025 | 8326.1 µg/m³ | Japan and South Korea, June and July 2025 |
| 26 Mar 2025 | 7924.3 µg/m³ | – |
| 19 Apr 2025 | 7421.6 µg/m³ | – |
| 16 Jul 2026 | 7220.2 µg/m³ | – |
| 24 Mar 2026 | 7019.5 µg/m³ | – |
| 22 Jul 2026 | 7019.3 µg/m³ | – |
| 25 Mar 2025 | 6919.0 µg/m³ | – |
| 7 Jun 2025 | 6919.0 µg/m³ | – |
| 14 Feb 2026 | 6919.0 µg/m³ | – |
Daily means, the highest since 15 Jun 2024; 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, Sakamoto, Japan, 15 Jun 2024 – 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/sakamoto/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.
Sakamoto now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).