SmogRank / Japan / Oita

Air quality in Ōita

Oita, Japan. PM2.5 from 4 reference monitors, updated hourly.

16.0 µg/m³
Moderate

Latest hour (13:00 UTC), 1.1× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#1,107
of 2,330 · 7.3 µg/m³
30 days
#822
of 2,324 · 7.1 µg/m³
Year
#859
of 2,173 · 9.3 µg/m³

Last 4 days, hour by hour

15302026-09-30 23:00 UTC: 8.0 µg/m³2026-10-01 01:00 UTC: 12.0 µg/m³2026-10-01 02:00 UTC: 8.0 µg/m³2026-10-01 03:00 UTC: 7.0 µg/m³2026-10-01 04:00 UTC: 9.0 µg/m³2026-10-01 05:00 UTC: 10.0 µg/m³2026-10-01 06:00 UTC: 11.0 µg/m³2026-10-01 07:00 UTC: 11.0 µg/m³2026-10-01 08:00 UTC: 14.0 µg/m³2026-10-01 09:00 UTC: 17.0 µg/m³2026-10-01 10:00 UTC: 15.0 µg/m³2026-10-01 11:00 UTC: 18.0 µg/m³2026-10-01 12:00 UTC: 16.0 µg/m³2026-10-01 13:00 UTC: 16.0 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: 6.1 µg/m³2025-09-30: 7.6 µg/m³2025-10-01: 12.1 µg/m³2025-10-02: 12.0 µg/m³2025-10-03: 11.8 µg/m³2025-10-04: 8.8 µg/m³2025-10-05: 7.5 µg/m³2025-10-06: 5.7 µg/m³2025-10-07: 10.7 µg/m³2025-10-08: 11.0 µg/m³2025-10-09: 5.8 µg/m³2025-10-10: 8.2 µg/m³2025-10-11: 13.1 µg/m³2025-10-12: 14.5 µg/m³2025-10-13: 8.6 µg/m³2025-10-14: 11.3 µg/m³2025-10-15: 7.7 µg/m³2025-10-16: 15.6 µg/m³2025-10-17: 7.1 µg/m³2025-10-18: 9.5 µg/m³2025-10-19: 4.1 µg/m³2025-10-20: 4.7 µg/m³2025-10-21: 4.1 µg/m³2025-10-22: 5.6 µg/m³2025-10-23: 5.7 µg/m³2025-10-24: 6.0 µg/m³2025-10-25: 7.8 µg/m³2025-10-26: 6.0 µg/m³2025-10-27: 10.1 µg/m³2025-10-28: 5.3 µg/m³2025-10-29: 6.2 µg/m³2025-10-30: 10.1 µg/m³2025-10-31: 6.5 µg/m³2025-11-01: 5.6 µg/m³2025-11-02: 8.5 µg/m³2025-11-03: 6.4 µg/m³2025-11-04: 9.1 µg/m³2025-11-05: 9.3 µg/m³2025-11-06: 8.6 µg/m³2025-11-07: 7.0 µg/m³2025-11-08: 12.8 µg/m³2025-11-09: 7.0 µg/m³2025-11-10: 9.9 µg/m³2025-11-11: 6.7 µg/m³2025-11-12: 9.6 µg/m³2025-11-13: 10.1 µg/m³2025-11-14: 9.8 µg/m³2025-11-15: 10.7 µg/m³2025-11-16: 12.5 µg/m³2025-11-17: 13.0 µg/m³2025-11-18: 7.9 µg/m³2025-11-19: 7.2 µg/m³2025-11-20: 6.4 µg/m³2025-11-21: 9.7 µg/m³2025-11-22: 6.0 µg/m³2025-11-23: 12.6 µg/m³2025-11-24: 11.1 µg/m³2025-11-25: 12.3 µg/m³2025-11-26: 15.0 µg/m³2025-11-27: 12.6 µg/m³2025-11-28: 10.2 µg/m³2025-11-29: 7.7 µg/m³2025-11-30: 11.2 µg/m³2025-12-01: 8.1 µg/m³2025-12-02: 10.5 µg/m³2025-12-03: 8.0 µg/m³2025-12-04: 4.2 µg/m³2025-12-05: 5.2 µg/m³2025-12-06: 8.1 µg/m³2025-12-07: 7.8 µg/m³2025-12-08: 11.9 µg/m³2025-12-09: 7.2 µg/m³2025-12-10: 7.1 µg/m³2025-12-11: 12.5 µg/m³2025-12-12: 5.4 µg/m³2025-12-13: 7.2 µg/m³2025-12-14: 5.4 µg/m³2025-12-15: 6.0 µg/m³2025-12-16: 7.1 µg/m³2025-12-17: 10.2 µg/m³2025-12-18: 12.2 µg/m³2025-12-19: 9.4 µg/m³2025-12-20: no data2025-12-21: 7.4 µg/m³2025-12-22: 2.9 µg/m³2025-12-23: 5.4 µg/m³2025-12-24: 8.3 µg/m³2025-12-25: 5.7 µg/m³2025-12-26: 3.9 µg/m³2025-12-27: 4.0 µg/m³2025-12-28: 9.1 µg/m³2025-12-29: 8.9 µg/m³2025-12-30: 10.5 µg/m³2025-12-31: 6.6 µg/m³2026-01-01: 4.0 µg/m³2026-01-02: 3.7 µg/m³2026-01-03: 4.6 µg/m³2026-01-04: 7.6 µg/m³2026-01-05: 8.6 µg/m³2026-01-06: 7.0 µg/m³2026-01-07: 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: 5.8 µg/m³2026-01-15: 12.7 µg/m³2026-01-16: 17.9 µg/m³2026-01-17: 15.6 µg/m³2026-01-18: 19.9 µg/m³2026-01-19: no data2026-01-20: 8.0 µg/m³2026-01-21: 2.7 µg/m³2026-01-22: 2.9 µg/m³2026-01-23: 6.0 µg/m³2026-01-24: no data2026-01-25: no data2026-01-26: 5.1 µg/m³2026-01-27: 10.1 µg/m³2026-01-28: 7.7 µg/m³2026-01-29: no data2026-01-30: 8.4 µg/m³2026-01-31: 5.9 µg/m³2026-02-01: 10.3 µg/m³2026-02-02: 9.3 µg/m³2026-02-03: 11.3 µg/m³2026-02-04: 8.8 µg/m³2026-02-05: 7.8 µg/m³2026-02-06: 14.3 µg/m³2026-02-07: 9.9 µg/m³2026-02-08: 4.8 µg/m³2026-02-09: 5.9 µg/m³2026-02-10: 8.1 µg/m³2026-02-11: 7.0 µg/m³2026-02-12: 11.7 µg/m³2026-02-13: 15.1 µg/m³2026-02-14: 15.7 µg/m³2026-02-15: 14.0 µg/m³2026-02-16: 15.9 µg/m³2026-02-17: 6.6 µg/m³2026-02-18: 8.0 µg/m³2026-02-19: 19.8 µg/m³2026-02-20: 11.8 µg/m³2026-02-21: 15.0 µg/m³2026-02-22: 10.2 µg/m³2026-02-23: 14.6 µg/m³2026-02-24: 10.7 µg/m³2026-02-25: 4.6 µg/m³2026-02-26: 4.9 µg/m³2026-02-27: 6.9 µg/m³2026-02-28: 2.8 µg/m³2026-03-01: 8.4 µg/m³2026-03-02: 10.3 µg/m³2026-03-03: 1.9 µg/m³2026-03-04: 3.8 µg/m³2026-03-05: 6.2 µg/m³2026-03-06: 7.2 µg/m³2026-03-07: 10.9 µg/m³2026-03-08: 9.5 µg/m³2026-03-09: 11.3 µg/m³2026-03-10: 11.2 µg/m³2026-03-11: 10.3 µg/m³2026-03-12: 8.9 µg/m³2026-03-13: 4.2 µg/m³2026-03-14: 3.5 µg/m³2026-03-15: 6.1 µg/m³2026-03-16: 12.0 µg/m³2026-03-17: 11.1 µg/m³2026-03-18: 15.2 µg/m³2026-03-19: 9.8 µg/m³2026-03-20: 14.9 µg/m³2026-03-21: 12.9 µg/m³2026-03-22: 15.2 µg/m³2026-03-23: 9.1 µg/m³2026-03-24: 15.2 µg/m³2026-03-25: 13.3 µg/m³2026-03-26: 6.0 µg/m³2026-03-27: 13.2 µg/m³2026-03-28: 24.5 µg/m³2026-03-29: 27.2 µg/m³2026-03-30: 13.7 µg/m³2026-03-31: 4.1 µg/m³2026-04-01: 3.3 µg/m³2026-04-02: 8.6 µg/m³2026-04-03: 9.9 µg/m³2026-04-04: 5.4 µg/m³2026-04-05: 9.7 µg/m³2026-04-06: 13.6 µg/m³2026-04-07: 9.1 µg/m³2026-04-08: 10.0 µg/m³2026-04-09: 9.4 µg/m³2026-04-10: 5.7 µg/m³2026-04-11: 9.4 µg/m³2026-04-12: 12.7 µg/m³2026-04-13: 11.0 µg/m³2026-04-14: 8.5 µg/m³2026-04-15: 9.5 µg/m³2026-04-16: 7.3 µg/m³2026-04-17: 9.2 µg/m³2026-04-18: 12.0 µg/m³2026-04-19: 8.0 µg/m³2026-04-20: 7.6 µg/m³2026-04-21: 9.2 µg/m³2026-04-22: 11.0 µg/m³2026-04-23: 4.9 µg/m³2026-04-24: 6.9 µg/m³2026-04-25: 11.1 µg/m³2026-04-26: 8.9 µg/m³2026-04-27: 9.1 µg/m³2026-04-28: 15.9 µg/m³2026-04-29: 12.1 µg/m³2026-04-30: 5.0 µg/m³2026-05-01: 8.7 µg/m³2026-05-02: 15.6 µg/m³2026-05-03: 16.5 µg/m³2026-05-04: 6.5 µg/m³2026-05-05: 10.6 µg/m³2026-05-06: 9.9 µg/m³2026-05-07: 10.0 µg/m³2026-05-08: 9.6 µg/m³2026-05-09: 6.2 µg/m³2026-05-10: 7.9 µg/m³2026-05-11: 8.6 µg/m³2026-05-12: 6.7 µg/m³2026-05-13: 7.7 µg/m³2026-05-14: 12.0 µg/m³2026-05-15: 12.8 µg/m³2026-05-16: 13.5 µg/m³2026-05-17: 18.1 µg/m³2026-05-18: 15.2 µg/m³2026-05-19: 9.4 µg/m³2026-05-20: 5.5 µg/m³2026-05-21: 6.3 µg/m³2026-05-22: 6.3 µg/m³2026-05-23: 10.3 µg/m³2026-05-24: 6.3 µg/m³2026-05-25: 4.9 µg/m³2026-05-26: 3.3 µg/m³2026-05-27: 3.6 µg/m³2026-05-28: 12.9 µg/m³2026-05-29: 11.5 µg/m³2026-05-30: 13.1 µg/m³2026-05-31: 14.6 µg/m³2026-06-01: 9.7 µg/m³2026-06-02: 5.2 µg/m³2026-06-03: 3.4 µg/m³2026-06-04: 6.8 µg/m³2026-06-05: 8.0 µg/m³2026-06-06: 4.9 µg/m³2026-06-07: 3.4 µg/m³2026-06-08: 7.2 µg/m³2026-06-09: 6.0 µg/m³2026-06-10: 7.1 µg/m³2026-06-11: 11.8 µg/m³2026-06-12: 11.5 µg/m³2026-06-13: 14.5 µg/m³2026-06-14: 12.8 µg/m³2026-06-15: 9.6 µg/m³2026-06-16: 4.5 µg/m³2026-06-17: 4.6 µg/m³2026-06-18: 7.9 µg/m³2026-06-19: 10.2 µg/m³2026-06-20: 4.7 µg/m³2026-06-21: 5.6 µg/m³2026-06-22: 5.8 µg/m³2026-06-23: 3.6 µg/m³2026-06-24: 2.8 µg/m³2026-06-25: 5.2 µg/m³2026-06-26: 4.2 µg/m³2026-06-27: 5.3 µg/m³2026-06-28: 8.0 µg/m³2026-06-29: 11.1 µg/m³2026-06-30: 19.8 µg/m³2026-07-01: 7.3 µg/m³2026-07-02: 5.3 µg/m³2026-07-03: 12.4 µg/m³2026-07-04: 8.6 µg/m³2026-07-05: 5.8 µg/m³2026-07-06: 5.4 µg/m³2026-07-07: 8.4 µg/m³2026-07-08: 5.1 µg/m³2026-07-09: 3.7 µg/m³2026-07-10: 3.5 µg/m³2026-07-11: 3.6 µg/m³2026-07-12: 7.4 µg/m³2026-07-13: 16.4 µg/m³2026-07-14: 19.0 µg/m³2026-07-15: 7.5 µg/m³2026-07-16: 13.2 µg/m³2026-07-17: 17.8 µg/m³2026-07-18: 24.5 µg/m³2026-07-19: 24.8 µg/m³2026-07-20: 25.6 µg/m³2026-07-21: 34.5 µg/m³2026-07-22: 24.5 µg/m³2026-07-23: 17.7 µg/m³2026-07-24: 16.6 µg/m³2026-07-25: 13.7 µg/m³2026-07-26: 8.6 µg/m³2026-07-27: 14.6 µg/m³2026-07-28: 15.5 µg/m³2026-07-29: 8.1 µg/m³2026-07-30: 8.7 µg/m³2026-07-31: 9.1 µg/m³2026-08-01: 11.7 µg/m³2026-08-02: 14.6 µg/m³2026-08-03: 16.5 µg/m³2026-08-04: 9.9 µg/m³2026-08-05: 7.1 µg/m³2026-08-06: 8.0 µg/m³2026-08-07: 6.0 µg/m³2026-08-08: 4.8 µg/m³2026-08-09: 4.6 µg/m³2026-08-10: 8.0 µg/m³2026-08-11: 9.2 µg/m³2026-08-12: 6.4 µg/m³2026-08-13: 12.1 µg/m³2026-08-14: 11.8 µg/m³2026-08-15: 7.9 µg/m³2026-08-16: 7.0 µg/m³2026-08-17: 4.6 µg/m³2026-08-18: 3.0 µg/m³2026-08-19: 3.8 µg/m³2026-08-20: 3.0 µg/m³2026-08-21: 3.3 µg/m³2026-08-22: 5.6 µg/m³2026-08-23: 5.6 µg/m³2026-08-24: 4.5 µg/m³2026-08-25: 3.5 µg/m³2026-08-26: 2.8 µg/m³2026-08-27: 4.3 µg/m³2026-08-28: 5.9 µg/m³2026-08-29: 12.1 µg/m³2026-08-30: 18.2 µg/m³2026-08-31: 13.1 µg/m³2026-09-01: 3.7 µg/m³2026-09-02: 3.1 µg/m³2026-09-03: 3.6 µg/m³2026-09-04: 3.1 µg/m³2026-09-05: 5.0 µg/m³2026-09-06: 7.0 µg/m³2026-09-07: 4.6 µg/m³2026-09-08: 5.3 µg/m³2026-09-09: 3.8 µg/m³2026-09-10: 6.6 µg/m³2026-09-11: 8.2 µg/m³2026-09-12: 12.0 µg/m³2026-09-13: 9.2 µg/m³2026-09-14: 6.3 µg/m³2026-09-15: 8.3 µg/m³2026-09-16: 6.7 µg/m³2026-09-17: 7.8 µg/m³2026-09-18: 8.6 µg/m³2026-09-19: 9.1 µg/m³2026-09-20: 4.5 µg/m³2026-09-21: 5.8 µg/m³2026-09-22: 9.5 µg/m³2026-09-23: 11.0 µg/m³2026-09-24: 11.6 µg/m³2026-09-25: 12.3 µg/m³2026-09-26: 11.8 µg/m³2026-09-27: 2.8 µg/m³2026-09-28: 5.6 µg/m³2026-09-29: 4.6 µg/m³2026-09-30: 6.8 µg/m³2026-10-01: no data
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

32 of 352 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2340NovDecJanFebMarAprMayJunJulAugSep

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

2026 against 2025, month by month

15Jan 2025: 10.5 µg/m³Jan 2026: 8.2 µg/m³JanFeb 2025: 8.7 µg/m³Feb 2026: 10.2 µg/m³FebMar 2025: 12.5 µg/m³Mar 2026: 10.7 µg/m³MarApr 2025: 11.6 µg/m³Apr 2026: 9.1 µg/m³AprMay 2025: 11.3 µg/m³May 2026: 9.8 µg/m³MayJun 2025: 12.8 µg/m³Jun 2026: 7.5 µg/m³JunJul 2025: 13.3 µg/m³Jul 2026: 12.8 µg/m³JulAug 2025: 12.9 µg/m³Aug 2026: 7.7 µg/m³AugSep 2025: 7.7 µg/m³Sep 2026: 6.9 µg/m³SepOct 2025: 8.5 µg/m³OctNov 2025: 9.5 µg/m³NovDec 2025: 7.5 µg/m³Dec

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

This week against past years

This weekThis week: 7.3 µg/m³7.320252025: 7.7 µg/m³7.720242024: 11.1 µg/m³11.120232023: 11.4 µg/m³11.4

Mean PM2.5 for 25 Sept to 1 Oct in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
大分市中戸次本町政府標準利用規約（第2.0版） (Government Standard Terms of Use v2.0)Ministry of the Environment Air Pollutant Wide Area Monitoring SystemReference
大分市南春日町６番１号政府標準利用規約（第2.0版） (Government Standard Terms of Use v2.0)Ministry of the Environment Air Pollutant Wide Area Monitoring SystemReference
大分市大字横瀬４１６番地政府標準利用規約（第2.0版） (Government Standard Terms of Use v2.0)Ministry of the Environment Air Pollutant Wide Area Monitoring SystemReference
大分市金池町２丁目の１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 9.7Kanoya 9.6Ōzu 9.4Onomichi 9.4Hita 9.4Kobayashi 9.3Minamata 9.2Hitoyoshi 9.1Takanabe 9.0Ōyanomachi-noboritate 9.0Kamisu 9.0Hyūga 9.0

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

Updated 2026-10-01 16:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.