SmogRank / Japan / Oita

Air quality in Hiji

Oita, Japan. PM2.5 from 1 reference monitor, updated hourly.

11.0 µg/m³
Moderate

Latest hour (07:00 UTC), 0.7× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#1,235
of 2,333 · 7.0 µg/m³
30 days
#1,227
of 2,331 · 6.1 µg/m³
Year
#1,014
of 2,173 · 8.9 µg/m³

Last 4 days, hour by hour

15302026-09-30 23:00 UTC: 9.0 µg/m³2026-10-01 00:00 UTC: 9.0 µg/m³2026-10-01 01:00 UTC: 10.0 µg/m³2026-10-01 02:00 UTC: 8.0 µg/m³2026-10-01 03:00 UTC: 8.0 µg/m³2026-10-01 04:00 UTC: 10.0 µg/m³2026-10-01 05:00 UTC: 10.0 µg/m³2026-10-01 06:00 UTC: 10.0 µg/m³2026-10-01 07:00 UTC: 11.0 µg/m³Sep 28Sep 29Sep 30Oct 1

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: no data2025-09-30: no data2025-10-01: no data2025-10-02: no data2025-10-03: no data2025-10-04: no data2025-10-05: no data2025-10-06: no data2025-10-07: no data2025-10-08: no data2025-10-09: no data2025-10-10: no data2025-10-11: no data2025-10-12: no data2025-10-13: no data2025-10-14: no data2025-10-15: no data2025-10-16: no data2025-10-17: no data2025-10-18: no data2025-10-19: no data2025-10-20: no data2025-10-21: no data2025-10-22: no data2025-10-23: no data2025-10-24: no data2025-10-25: no data2025-10-26: no data2025-10-27: no data2025-10-28: no data2025-10-29: no data2025-10-30: no data2025-10-31: no data2025-11-01: no data2025-11-02: no data2025-11-03: no data2025-11-04: no data2025-11-05: no data2025-11-06: no data2025-11-07: no data2025-11-08: no data2025-11-09: no data2025-11-10: no data2025-11-11: no data2025-11-12: no data2025-11-13: no data2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: no data2025-11-20: no data2025-11-21: no data2025-11-22: no data2025-11-23: no data2025-11-24: no data2025-11-25: no data2025-11-26: no data2025-11-27: no data2025-11-28: no data2025-11-29: no data2025-11-30: no data2025-12-01: no data2025-12-02: no data2025-12-03: no data2025-12-04: no data2025-12-05: no data2025-12-06: no data2025-12-07: no data2025-12-08: no data2025-12-09: no data2025-12-10: no data2025-12-11: no data2025-12-12: no data2025-12-13: no data2025-12-14: no data2025-12-15: no data2025-12-16: no data2025-12-17: no data2025-12-18: no data2025-12-19: no data2025-12-20: no data2025-12-21: no data2025-12-22: no data2025-12-23: no data2025-12-24: no data2025-12-25: no data2025-12-26: no data2025-12-27: no data2025-12-28: no data2025-12-29: no data2025-12-30: no data2025-12-31: no data2026-01-01: no data2026-01-02: no data2026-01-03: no data2026-01-04: no data2026-01-05: no data2026-01-06: no data2026-01-07: no data2026-01-08: no data2026-01-09: no data2026-01-10: no data2026-01-11: no data2026-01-12: no data2026-01-13: no data2026-01-14: no data2026-01-15: no data2026-01-16: no data2026-01-17: no data2026-01-18: no data2026-01-19: no data2026-01-20: no data2026-01-21: no data2026-01-22: no data2026-01-23: no data2026-01-24: no data2026-01-25: no data2026-01-26: no data2026-01-27: no data2026-01-28: no data2026-01-29: no data2026-01-30: no data2026-01-31: no data2026-02-01: no data2026-02-02: no data2026-02-03: no data2026-02-04: no data2026-02-05: no data2026-02-06: no data2026-02-07: no data2026-02-08: no data2026-02-09: no data2026-02-10: no data2026-02-11: no data2026-02-12: no data2026-02-13: no data2026-02-14: no data2026-02-15: no data2026-02-16: no data2026-02-17: no data2026-02-18: no data2026-02-19: no data2026-02-20: no data2026-02-21: no data2026-02-22: no data2026-02-23: no data2026-02-24: no data2026-02-25: no data2026-02-26: no data2026-02-27: no data2026-02-28: 3.3 µg/m³2026-03-01: 8.0 µg/m³2026-03-02: 10.9 µg/m³2026-03-03: 1.9 µg/m³2026-03-04: 4.0 µg/m³2026-03-05: 5.2 µg/m³2026-03-06: 8.9 µg/m³2026-03-07: 13.1 µg/m³2026-03-08: 10.9 µg/m³2026-03-09: 14.0 µg/m³2026-03-10: 13.2 µg/m³2026-03-11: 10.8 µg/m³2026-03-12: 10.8 µg/m³2026-03-13: 4.4 µg/m³2026-03-14: 3.4 µg/m³2026-03-15: 5.7 µg/m³2026-03-16: 12.0 µg/m³2026-03-17: 11.8 µg/m³2026-03-18: 17.1 µg/m³2026-03-19: 9.6 µg/m³2026-03-20: 16.3 µg/m³2026-03-21: 14.7 µg/m³2026-03-22: 18.7 µg/m³2026-03-23: 9.0 µg/m³2026-03-24: 17.6 µg/m³2026-03-25: 11.5 µg/m³2026-03-26: 7.3 µg/m³2026-03-27: 10.1 µg/m³2026-03-28: 27.8 µg/m³2026-03-29: 33.1 µg/m³2026-03-30: 19.3 µg/m³2026-03-31: 4.1 µg/m³2026-04-01: 4.0 µg/m³2026-04-02: no data2026-04-03: no data2026-04-04: 5.7 µg/m³2026-04-05: 9.8 µg/m³2026-04-06: 16.7 µg/m³2026-04-07: 9.0 µg/m³2026-04-08: 8.6 µg/m³2026-04-09: 11.9 µg/m³2026-04-10: no data2026-04-11: 9.3 µg/m³2026-04-12: 13.4 µg/m³2026-04-13: 12.5 µg/m³2026-04-14: 10.6 µg/m³2026-04-15: 9.3 µg/m³2026-04-16: 8.0 µg/m³2026-04-17: 11.5 µg/m³2026-04-18: 12.3 µg/m³2026-04-19: 11.6 µg/m³2026-04-20: 9.6 µg/m³2026-04-21: 10.5 µg/m³2026-04-22: 13.0 µg/m³2026-04-23: 3.9 µg/m³2026-04-24: 7.8 µg/m³2026-04-25: 11.3 µg/m³2026-04-26: 9.1 µg/m³2026-04-27: 8.1 µg/m³2026-04-28: 17.6 µg/m³2026-04-29: 10.5 µg/m³2026-04-30: 6.6 µg/m³2026-05-01: 8.6 µg/m³2026-05-02: 14.8 µg/m³2026-05-03: 17.8 µg/m³2026-05-04: 7.5 µg/m³2026-05-05: 10.4 µg/m³2026-05-06: 10.4 µg/m³2026-05-07: 11.3 µg/m³2026-05-08: 9.3 µg/m³2026-05-09: 6.1 µg/m³2026-05-10: 8.4 µg/m³2026-05-11: 7.7 µg/m³2026-05-12: 6.3 µg/m³2026-05-13: 6.3 µg/m³2026-05-14: 11.0 µg/m³2026-05-15: 12.5 µg/m³2026-05-16: 14.5 µg/m³2026-05-17: 18.8 µg/m³2026-05-18: 15.2 µg/m³2026-05-19: 10.1 µg/m³2026-05-20: 4.9 µg/m³2026-05-21: 6.4 µg/m³2026-05-22: 5.5 µg/m³2026-05-23: 9.2 µg/m³2026-05-24: 8.6 µg/m³2026-05-25: 5.8 µg/m³2026-05-26: 3.6 µg/m³2026-05-27: 3.1 µg/m³2026-05-28: 8.6 µg/m³2026-05-29: 10.3 µg/m³2026-05-30: 9.6 µg/m³2026-05-31: 14.2 µg/m³2026-06-01: 8.7 µg/m³2026-06-02: 3.1 µg/m³2026-06-03: 4.2 µg/m³2026-06-04: 6.1 µg/m³2026-06-05: 6.2 µg/m³2026-06-06: 4.5 µg/m³2026-06-07: 3.1 µg/m³2026-06-08: 5.7 µg/m³2026-06-09: 7.1 µg/m³2026-06-10: 7.7 µg/m³2026-06-11: 12.4 µg/m³2026-06-12: 10.6 µg/m³2026-06-13: 12.7 µg/m³2026-06-14: 12.0 µg/m³2026-06-15: 8.8 µg/m³2026-06-16: 4.6 µg/m³2026-06-17: 4.4 µg/m³2026-06-18: 9.3 µg/m³2026-06-19: 9.6 µg/m³2026-06-20: 5.0 µg/m³2026-06-21: 4.4 µg/m³2026-06-22: 5.3 µg/m³2026-06-23: 3.3 µg/m³2026-06-24: 2.6 µg/m³2026-06-25: 4.2 µg/m³2026-06-26: 2.8 µg/m³2026-06-27: 5.6 µg/m³2026-06-28: 6.7 µg/m³2026-06-29: 8.3 µg/m³2026-06-30: 17.6 µg/m³2026-07-01: 8.0 µg/m³2026-07-02: 5.4 µg/m³2026-07-03: 12.4 µg/m³2026-07-04: 8.1 µg/m³2026-07-05: 4.7 µg/m³2026-07-06: 4.8 µg/m³2026-07-07: 8.6 µg/m³2026-07-08: 5.5 µg/m³2026-07-09: 4.6 µg/m³2026-07-10: 3.8 µg/m³2026-07-11: 4.5 µg/m³2026-07-12: 8.1 µg/m³2026-07-13: 14.0 µg/m³2026-07-14: 14.4 µg/m³2026-07-15: 7.2 µg/m³2026-07-16: 12.5 µg/m³2026-07-17: 16.7 µg/m³2026-07-18: 21.5 µg/m³2026-07-19: 21.5 µg/m³2026-07-20: 17.4 µg/m³2026-07-21: 24.3 µg/m³2026-07-22: 21.9 µg/m³2026-07-23: 16.2 µg/m³2026-07-24: 11.3 µg/m³2026-07-25: 9.5 µg/m³2026-07-26: 8.6 µg/m³2026-07-27: 13.0 µg/m³2026-07-28: 10.4 µg/m³2026-07-29: 6.3 µg/m³2026-07-30: 7.3 µg/m³2026-07-31: 8.1 µg/m³2026-08-01: 10.4 µg/m³2026-08-02: 14.3 µg/m³2026-08-03: 16.2 µg/m³2026-08-04: 9.9 µg/m³2026-08-05: 8.5 µg/m³2026-08-06: 6.8 µg/m³2026-08-07: 5.1 µg/m³2026-08-08: 4.6 µg/m³2026-08-09: 4.5 µg/m³2026-08-10: 6.7 µg/m³2026-08-11: 6.1 µg/m³2026-08-12: 6.1 µg/m³2026-08-13: 10.5 µg/m³2026-08-14: 12.8 µg/m³2026-08-15: 6.3 µg/m³2026-08-16: 6.4 µg/m³2026-08-17: 4.1 µg/m³2026-08-18: 4.0 µg/m³2026-08-19: 3.5 µg/m³2026-08-20: 3.3 µg/m³2026-08-21: 3.5 µg/m³2026-08-22: 5.7 µg/m³2026-08-23: 5.5 µg/m³2026-08-24: 5.6 µg/m³2026-08-25: 3.5 µg/m³2026-08-26: 3.3 µg/m³2026-08-27: 4.1 µg/m³2026-08-28: 4.9 µg/m³2026-08-29: 11.3 µg/m³2026-08-30: 16.0 µg/m³2026-08-31: 8.6 µg/m³2026-09-01: 2.8 µg/m³2026-09-02: 2.8 µg/m³2026-09-03: 4.0 µg/m³2026-09-04: 2.5 µg/m³2026-09-05: 5.2 µg/m³2026-09-06: 5.8 µg/m³2026-09-07: 4.1 µg/m³2026-09-08: 4.6 µg/m³2026-09-09: 3.9 µg/m³2026-09-10: 6.5 µg/m³2026-09-11: 7.7 µg/m³2026-09-12: 9.8 µg/m³2026-09-13: 7.9 µg/m³2026-09-14: 5.4 µg/m³2026-09-15: 7.1 µg/m³2026-09-16: 5.5 µg/m³2026-09-17: 7.0 µg/m³2026-09-18: 5.8 µg/m³2026-09-19: 8.1 µg/m³2026-09-20: 3.8 µg/m³2026-09-21: 6.0 µg/m³2026-09-22: 9.6 µg/m³2026-09-23: 8.4 µg/m³2026-09-24: 5.6 µg/m³2026-09-25: 10.7 µg/m³2026-09-26: 10.1 µg/m³2026-09-27: 5.2 µg/m³2026-09-28: 7.7 µg/m³2026-09-29: 4.2 µg/m³2026-09-30: 5.8 µg/m³
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

22 of 212 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2275MarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15JanFebMar 2026: 11.8 µg/m³MarApr 2026: 10.1 µg/m³AprMay 2026: 9.6 µg/m³MayJun 2026: 6.9 µg/m³JunJul 2026: 11.0 µg/m³JulAug 2026: 7.2 µg/m³AugSep 2026: 6.1 µg/m³SepOctNovDec

Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

StationOperatorType
速見郡日出町大字大神1396番地43政府標準利用規約（第2.0版） (Government Standard Terms of Use v2.0)Ministry of the Environment Air Pollutant Wide Area Monitoring SystemReference

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Japan

Honmachi 9.6Onomichi 9.5Hita 9.4Ōzu 9.3Kanoya 9.3Kobayashi 9.1Kamisu 9.1Ōyanomachi-noboritate 9.0Minamata 9.0Hitoyoshi 8.9Owariasahi 8.9Hyūga 8.9

30-day averages, µg/m³. All of Japan →

Updated 2026-10-01 09:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.