SmogRank / Japan / Miyazaki / Shintomi
Shintomi, month by month
Shintomi has a measured daily mean on 1,090 days since 28 July 2023. Its worst month was July 2026, at 57 US AQI (12.3 µg/m³), 843rd of 2,784 cities on that month's world ranking. Its cleanest was June 2026, at 33 US AQI (5.9 µg/m³). 2025 averaged 50 US AQI (9.0 µg/m³), against 45 US AQI (8.1 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
4 months
| Month | Why |
|---|---|
| Nov 2025 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 9 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 2 of 31 days measured; a month needs 22. The others: 2 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.
Shintomi's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 5712.3 µg/m³ | 843rdof 2,784 | – |
| August 2024 | 5511.2 µg/m³ | 422ndof 2,010 | Miyazaki, Oita and Kumamoto, Japan, August 2024 |
| March 2025 | 5410.9 µg/m³ | 1,430thof 2,862 | – |
| July 2025 | 5410.6 µg/m³ | 1,136thof 2,889 | Japan and South Korea, June and July 2025 |
| January 2025 | 5310.3 µg/m³ | 940thof 2,474 | – |
| March 2026 | 5310.3 µg/m³ | 1,593rdof 2,971 | Japan and South Korea, March 2026 |
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.
Shintomi's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Jul 2025 | 13750.1 µg/m³ | Japan and South Korea, June and July 2025 |
| 18 Jan 2026 | 10035.3 µg/m³ | South Korea and Japan, January 2026 |
| 4 Jul 2025 | 9432.4 µg/m³ | Japan and South Korea, June and July 2025 |
| 11 Feb 2024 | 9130.8 µg/m³ | Japan, 11 to 12 February 2024 |
| 29 Mar 2026 | 8929.4 µg/m³ | Japan and South Korea, March 2026 |
| 4 Aug 2024 | 8225.8 µg/m³ | Miyazaki, Oita and Kumamoto, Japan, August 2024 |
| 4 Sept 2024 | 8125.2 µg/m³ | Japan and South Korea, September 2024 |
| 22 Jul 2026 | 8024.8 µg/m³ | – |
| 25 Jul 2026 | 8024.8 µg/m³ | – |
| 19 Jan 2025 | 7823.5 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, Shintomi, 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/shintomi/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.
Shintomi now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 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).