Shimoono, Koga, Ibaraki, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Shimoono, Koga, Ibaraki, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (13th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 29 of Good air quality, showing improvement over 2025 and 2024 on the same day.
Day & Night AQI Trend: 12th Aug - 13th Aug 2026
Shimoono, Koga, Ibaraki, Japan
4 AM12th Aug 2026
6 PM
3 AM13th Aug 2026
31AQI
21AQI
34AQI
23AQI
In the last 24 hours,
Shimoono's AQI reached its highest point of 34 at 3 AM during the Night, while the lowest point, 21, was recorded at 1 PM during the Day between 12th Aug and 13th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Shimoono, Koga, Ibaraki, Japan
31°C27/37°C
31°C27/36°C
28°C25/30°C
27°C25/30°C
29°C25/33°C
32°C27/38°C
33°C29/39°C
33°C28/39°C
32°C27/39°C
28°C26/34°C
28°C24/35°C
28°C25/33°C
26°C22/31°C
26°C23/31°C
29°C23/35°C
31°C26/37°C
30°C27/35°C
31°C26/37°C
29°C24/35°C
24°C23/25°C
25°C21/30°C
26°C22/32°C
29°C26/33°C
30°C26/36°C
31°C26/36°C
28°C25/33°C
27°C24/32°C
23°C21/27°C
22°C21/24°C
25°C22/30°C
34AQI
31AQI
34AQI
31AQI
2026 Days Vs Air Quality
Shimoono, Koga, Ibaraki, Japan
87%
196
13%
29
Total number of days with different AQI categories in last 225 days in 2026 (140 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2026, 87% of 225 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
Shimoono, Koga, Ibaraki, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
20AQI (US)
22AQI (US)
23AQI (US)
20AQI (US)
46AQI (US)
23AQI (US)
40AQI (US)
40AQI (US)
26AQI (US)
39AQI (US)
35AQI (US)
17AQI (US)
39AQI (US)
14AQI (US)
33AQI (US)
43AQI (US)
43AQI (US)
25AQI (US)
40AQI (US)
31AQI (US)
10AQI (US)
22AQI (US)
35AQI (US)
40AQI (US)
44AQI (US)
24AQI (US)
40AQI (US)
21AQI (US)
20AQI (US)
35AQI (US)
37AQI (US)
34AQI (US)
42AQI (US)
30AQI (US)
41AQI (US)
52AQI (US)
47AQI (US)
17AQI (US)
12AQI (US)
32AQI (US)
41AQI (US)
58AQI (US)
34AQI (US)
41AQI (US)
54AQI (US)
72AQI (US)
47AQI (US)
16AQI (US)
30AQI (US)
27AQI (US)
33AQI (US)
44AQI (US)
43AQI (US)
43AQI (US)
40AQI (US)
34AQI (US)
10AQI (US)
31AQI (US)
43AQI (US)
36AQI (US)
66AQI (US)
42AQI (US)
58AQI (US)
60AQI (US)
53AQI (US)
46AQI (US)
43AQI (US)
45AQI (US)
59AQI (US)
60AQI (US)
66AQI (US)
40AQI (US)
33AQI (US)
14AQI (US)
30AQI (US)
54AQI (US)
56AQI (US)
42AQI (US)
31AQI (US)
50AQI (US)
51AQI (US)
51AQI (US)
43AQI (US)
67AQI (US)
28AQI (US)
19AQI (US)
49AQI (US)
52AQI (US)
56AQI (US)
27AQI (US)
18AQI (US)
23AQI (US)
46AQI (US)
52AQI (US)
31AQI (US)
19AQI (US)
41AQI (US)
23AQI (US)
35AQI (US)
44AQI (US)
37AQI (US)
30AQI (US)
33AQI (US)
38AQI (US)
37AQI (US)
32AQI (US)
34AQI (US)
32AQI (US)
32AQI (US)
34AQI (US)
38AQI (US)
45AQI (US)
35AQI (US)
31AQI (US)
45AQI (US)
50AQI (US)
48AQI (US)
42AQI (US)
38AQI (US)
38AQI (US)
47AQI (US)
50AQI (US)
47AQI (US)
27AQI (US)
22AQI (US)
30AQI (US)
30AQI (US)
24AQI (US)
25AQI (US)
27AQI (US)
27AQI (US)
34AQI (US)
37AQI (US)
33AQI (US)
34AQI (US)
86AQI (US)
69AQI (US)
53AQI (US)
49AQI (US)
61AQI (US)
59AQI (US)
61AQI (US)
52AQI (US)
59AQI (US)
47AQI (US)
40AQI (US)
25AQI (US)
25AQI (US)
24AQI (US)
24AQI (US)
25AQI (US)
28AQI (US)
28AQI (US)
20AQI (US)
21AQI (US)
21AQI (US)
19AQI (US)
20AQI (US)
20AQI (US)
22AQI (US)
22AQI (US)
25AQI (US)
23AQI (US)
26AQI (US)
48AQI (US)
16AQI (US)
19AQI (US)
24AQI (US)
25AQI (US)
27AQI (US)
22AQI (US)
19AQI (US)
19AQI (US)
21AQI (US)
22AQI (US)
26AQI (US)
29AQI (US)
26AQI (US)
27AQI (US)
25AQI (US)
24AQI (US)
26AQI (US)
18AQI (US)
17AQI (US)
32AQI (US)
24AQI (US)
24AQI (US)
26AQI (US)
20AQI (US)
22AQI (US)
26AQI (US)
24AQI (US)
26AQI (US)
30AQI (US)
31AQI (US)
33AQI (US)
51AQI (US)
44AQI (US)
26AQI (US)
28AQI (US)
30AQI (US)
45AQI (US)
58AQI (US)
45AQI (US)
29AQI (US)
28AQI (US)
27AQI (US)
26AQI (US)
30AQI (US)
32AQI (US)
28AQI (US)
46AQI (US)
42AQI (US)
45AQI (US)
12AQI (US)
24AQI (US)
27AQI (US)
25AQI (US)
25AQI (US)
27AQI (US)
31AQI (US)
30AQI (US)
31AQI (US)
26AQI (US)
29AQI (US)
31AQI (US)
37AQI (US)
46AQI (US)
36AQI (US)
40AQI (US)
24AQI (US)
31AQI (US)
29AQI (US)
No. of days
202635AQI (US)
Highest AQI (US) recorded in
March46AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202539AQI (US)
Highest AQI (US) recorded in
October47AQI (US)
Lowest AQI (US) recorded in
May31AQI (US)
202435AQI (US)
Highest AQI (US) recorded in
July43AQI (US)
Lowest AQI (US) recorded in
August26AQI (US)
202336AQI (US)
Highest AQI (US) recorded in
July41AQI (US)
Lowest AQI (US) recorded in
August27AQI (US)
202235AQI (US)
Highest AQI (US) recorded in
March40AQI (US)
Lowest AQI (US) recorded in
September29AQI (US)
202137AQI (US)
Highest AQI (US) recorded in
December42AQI (US)
Lowest AQI (US) recorded in
September33AQI (US)
202037AQI (US)
Highest AQI (US) recorded in
December61AQI (US)
Lowest AQI (US) recorded in
September26AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Shimoono's annual 2026 AQI (US) (35) shows an average percentage change of -3.9% (improved AQI (US)) compared to previous years: 2020 (37), 2021 (37), 2022 (35), 2023 (36), 2024 (35), 2025 (39).