SmogRank / Japan / Miyazaki / Hyūga
Hyūga, month by month
Hyūga has a measured daily mean on 1,081 days since 28 July 2023. Its worst month was July 2026, at 63 US AQI (15.4 µg/m³), 496th of 2,784 cities on that month's world ranking. Its cleanest was August 2023, at 41 US AQI (7.3 µg/m³). 2025 averaged 55 US AQI (11.0 µg/m³), against 52 US AQI (9.7 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 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | 5 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 3 of 31 days measured; a month needs 22. The others: 1 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.
Hyūga's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 6315.4 µg/m³ | 496thof 2,784 | Japan and South Korea, July 2026 |
| March 2025 | 6014.1 µg/m³ | 1,024thof 2,862 | Japan and South Korea, March 2025 Japan and South Korea, February and March 2025 |
| April 2025 | 5813.1 µg/m³ | 649thof 2,951 | – |
| March 2026 | 5712.5 µg/m³ | 1,124thof 2,971 | Japan and South Korea, March 2026 |
| July 2025 | 5712.4 µg/m³ | 753rdof 2,889 | Japan and South Korea, June and July 2025 |
| February 2026 | 5611.9 µg/m³ | 1,036thof 2,866 | South Korea and Japan, 19 to 21 February 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.
Hyūga's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Jul 2025 | 13248.0 µg/m³ | Japan and South Korea, June and July 2025 |
| 4 Jul 2025 | 11541.0 µg/m³ | Japan and South Korea, June and July 2025 |
| 3 Jul 2025 | 9331.9 µg/m³ | Japan and South Korea, June and July 2025 |
| 29 Mar 2026 | 8829.1 µg/m³ | Japan and South Korea, March 2026 |
| 22 Jul 2026 | 8728.2 µg/m³ | Japan and South Korea, July 2026 |
| 25 Jul 2026 | 8627.8 µg/m³ | Japan and South Korea, July 2026 |
| 2 Mar 2025 | 8527.2 µg/m³ | Japan and South Korea, February and March 2025 |
| 26 Mar 2025 | 8527.1 µg/m³ | Japan and South Korea, March 2025 |
| 21 Jul 2026 | 8326.5 µg/m³ | Japan and South Korea, July 2026 |
| 6 Jul 2025 | 8326.3 µg/m³ | Japan and South Korea, June and July 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, Hyūga, 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/hyuga/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.
Hyūga 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).