Miemachi Ichiba, Usuki, Oita, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Miemachi Ichiba, Usuki, Oita, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (17th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 77 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Oct - 18th Oct 2025
Miemachi Ichiba, Usuki, Oita, Japan
6 AM17th Oct 2025
5 PM
5 AM18th Oct 2025
AQI
AQI
86AQI
34AQI
In the last 24 hours,
Miemachi Ichiba's AQI reached its highest point of 86 at 8 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 17th Oct and 18th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Miemachi Ichiba, Usuki, Oita, Japan
23°C18/29°C
22°C17/29°C
22°C17/27°C
22°C18/28°C
19°C13/25°C
22°C17/27°C
22°C18/26°C
22°C18/27°C
23°C17/29°C
20°C16/25°C
22°C17/27°C
21°C17/26°C
17°C12/24°C
18°C13/26°C
19°C12/27°C
16°C14/18°C
21°C16/28°C
21°C18/28°C
22°C15/29°C
22°C15/30°C
22°C16/28°C
20°C15/27°C
20°C11/29°C
21°C14/30°C
20°C16/25°C
19°C15/25°C
18°C14/24°C
21°C16/27°C
21°C16/27°C
--°C/°C
--°C/°C
45AQI
41AQI
42AQI
42AQI
2025 Days Vs Air Quality
Miemachi Ichiba, Usuki, Oita, Japan
77%
224
22%
65
0.3%
1
Total number of days with different AQI categories in last 290 days in 2025 (75 days remaining)
Under WHO’s Safe Air Quality Limits: 77%
Health Risk Level:
Low
In 2025, 77% of 290 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
Miemachi Ichiba, Usuki, Oita, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
30AQI
36AQI
34AQI
34AQI
31AQI
35AQI
33AQI
35AQI
30AQI
30AQI
27AQI
33AQI
42AQI
41AQI
39AQI
37AQI
40AQI
37AQI
42AQI
38AQI
57AQI
55AQI
61AQI
63AQI
45AQI
40AQI
34AQI
35AQI
32AQI
36AQI
41AQI
41AQI
33AQI
40AQI
32AQI
37AQI
31AQI
33AQI
31AQI
30AQI
34AQI
37AQI
38AQI
32AQI
38AQI
32AQI
45AQI
42AQI
37AQI
36AQI
33AQI
34AQI
39AQI
40AQI
36AQI
37AQI
38AQI
57AQI
55AQI
69AQI
63AQI
47AQI
35AQI
34AQI
35AQI
33AQI
40AQI
40AQI
43AQI
44AQI
47AQI
57AQI
39AQI
38AQI
27AQI
49AQI
37AQI
42AQI
46AQI
56AQI
59AQI
64AQI
53AQI
71AQI
68AQI
55AQI
59AQI
51AQI
41AQI
40AQI
42AQI
34AQI
32AQI
35AQI
41AQI
46AQI
41AQI
34AQI
55AQI
48AQI
57AQI
55AQI
44AQI
51AQI
29AQI
50AQI
45AQI
52AQI
51AQI
38AQI
45AQI
32AQI
30AQI
35AQI
52AQI
44AQI
50AQI
49AQI
50AQI
50AQI
45AQI
39AQI
49AQI
38AQI
40AQI
38AQI
36AQI
42AQI
29AQI
40AQI
36AQI
51AQI
55AQI
59AQI
56AQI
53AQI
39AQI
49AQI
58AQI
59AQI
39AQI
42AQI
47AQI
30AQI
32AQI
33AQI
41AQI
40AQI
36AQI
40AQI
40AQI
48AQI
48AQI
31AQI
42AQI
44AQI
55AQI
63AQI
56AQI
33AQI
31AQI
42AQI
44AQI
46AQI
34AQI
29AQI
28AQI
33AQI
37AQI
45AQI
54AQI
54AQI
52AQI
36AQI
41AQI
43AQI
35AQI
44AQI
45AQI
50AQI
52AQI
66AQI
92AQI
97AQI
106AQI
94AQI
69AQI
66AQI
70AQI
78AQI
61AQI
45AQI
43AQI
39AQI
38AQI
48AQI
54AQI
41AQI
32AQI
30AQI
28AQI
26AQI
27AQI
26AQI
24AQI
22AQI
21AQI
21AQI
22AQI
21AQI
23AQI
34AQI
42AQI
47AQI
50AQI
49AQI
47AQI
46AQI
39AQI
39AQI
34AQI
35AQI
30AQI
36AQI
39AQI
45AQI
49AQI
45AQI
44AQI
47AQI
50AQI
39AQI
38AQI
43AQI
44AQI
45AQI
47AQI
43AQI
40AQI
46AQI
50AQI
51AQI
47AQI
38AQI
38AQI
36AQI
27AQI
25AQI
30AQI
36AQI
29AQI
29AQI
27AQI
31AQI
30AQI
31AQI
31AQI
35AQI
45AQI
36AQI
27AQI
30AQI
33AQI
26AQI
28AQI
27AQI
22AQI
21AQI
28AQI
26AQI
25AQI
24AQI
22AQI
37AQI
54AQI
52AQI
57AQI
53AQI
51AQI
56AQI
59AQI
51AQI
55AQI
57AQI
67AQI
48AQI
56AQI
55AQI
69AQI
77AQI
39AQI
37AQI
48AQI
44AQI
43AQI
43AQI
47AQI
43AQI
30AQI
56AQI
No. of days
202543AQI
Highest AQI recorded in
October56AQI
Lowest AQI recorded in
September30AQI
202434AQI
Highest AQI recorded in
May40AQI
Lowest AQI recorded in
July29AQI
202335AQI
Highest AQI recorded in
April42AQI
Lowest AQI recorded in
August27AQI
202236AQI
Highest AQI recorded in
May44AQI
Lowest AQI recorded in
December31AQI
202133AQI
Highest AQI recorded in
May41AQI
Lowest AQI recorded in
January29AQI
202035AQI
Highest AQI recorded in
August49AQI
Lowest AQI recorded in
December29AQI
Most & Least Polluted Years Over the Last 6 Years
Miemachi Ichiba's annual 2025 AQI (43) shows an average percentage change of 22.6% (worsened AQI) compared to previous years: 2020 (35), 2021 (33), 2022 (36), 2023 (35), 2024 (34).