Hiji, Oita, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
March Air Quality Analysis
Hiji, Oita, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (7th March):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 36 of Good air quality, showing improvement over 2024, 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 6th Mar - 7th Mar 2026
Hiji, Oita, Japan
6 AM6th Mar 2026
6 PM
5 AM7th Mar 2026
19AQI
8AQI
33AQI
8AQI
In the last 24 hours,
Hiji's AQI reached its highest point of 33 at 3 AM during the Night, while the lowest point, 8, was recorded at 7 PM during the Night between 6th Mar and 7th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Hiji, Oita, Japan
9°C5/15°C
6°C1/11°C
-2°C-5/0°C
0°C-6/9°C
4°C-2/11°C
7°C2/11°C
6°C1/14°C
6°C0/15°C
8°C2/16°C
12°C8/18°C
9°C5/15°C
7°C2/12°C
5°C1/12°C
5°C1/11°C
7°C3/14°C
8°C2/16°C
13°C5/22°C
10°C5/16°C
10°C4/17°C
11°C10/11°C
11°C7/15°C
12°C11/14°C
9°C4/13°C
8°C2/14°C
8°C6/11°C
10°C8/12°C
7°C3/12°C
6°C1/12°C
8°C4/14°C
5°C0/10°C
52AQI
32AQI
48AQI
35AQI
2026 Days Vs Air Quality
Hiji, Oita, Japan
86%
57
14%
9
Total number of days with different AQI categories in last 67 days in 2026 (298 days remaining)
Under WHO’s Safe Air Quality Limits: 86%
Health Risk Level:
Low
In 2026, 86% of 67 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Hiji, Oita, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI (US)
32AQI (US)
31AQI (US)
34AQI (US)
38AQI (US)
33AQI (US)
29AQI (US)
38AQI (US)
29AQI (US)
35AQI (US)
33AQI (US)
32AQI (US)
36AQI (US)
26AQI (US)
39AQI (US)
56AQI (US)
48AQI (US)
56AQI (US)
74AQI (US)
39AQI (US)
20AQI (US)
33AQI (US)
34AQI (US)
36AQI (US)
41AQI (US)
22AQI (US)
32AQI (US)
17AQI (US)
30AQI (US)
26AQI (US)
18AQI (US)
32AQI (US)
33AQI (US)
27AQI (US)
24AQI (US)
37AQI (US)
45AQI (US)
34AQI (US)
20AQI (US)
34AQI (US)
34AQI (US)
40AQI (US)
35AQI (US)
52AQI (US)
67AQI (US)
61AQI (US)
67AQI (US)
25AQI (US)
25AQI (US)
56AQI (US)
44AQI (US)
46AQI (US)
47AQI (US)
37AQI (US)
28AQI (US)
19AQI (US)
26AQI (US)
49AQI (US)
38AQI (US)
34AQI (US)
58AQI (US)
38AQI (US)
43AQI (US)
34AQI (US)
16AQI (US)
36AQI (US)
34AQI (US)
39AQI (US)
37AQI (US)
No. of days
202637AQI (US)
Highest AQI (US) recorded in
February39AQI (US)
Lowest AQI (US) recorded in
January34AQI (US)
202543AQI (US)
Highest AQI (US) recorded in
October50AQI (US)
Lowest AQI (US) recorded in
September31AQI (US)
202436AQI (US)
Highest AQI (US) recorded in
April44AQI (US)
Lowest AQI (US) recorded in
December32AQI (US)
202340AQI (US)
Highest AQI (US) recorded in
April47AQI (US)
Lowest AQI (US) recorded in
August29AQI (US)
202238AQI (US)
Highest AQI (US) recorded in
May48AQI (US)
Lowest AQI (US) recorded in
December33AQI (US)
202134AQI (US)
Highest AQI (US) recorded in
June41AQI (US)
Lowest AQI (US) recorded in
August28AQI (US)
202034AQI (US)
Highest AQI (US) recorded in
August52AQI (US)
Lowest AQI (US) recorded in
September25AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Hiji's annual 2026 AQI (US) (37) shows an average percentage change of -2.4% (improved AQI (US)) compared to previous years: 2020 (34), 2021 (34), 2022 (38), 2023 (40), 2024 (36), 2025 (43).