Marubayashi, 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
Marubayashi, Koga, Ibaraki, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (11th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 30 of Good air quality, showing improvement over 2025 on the same day.
Day & Night AQI Trend: 10th Aug - 11th Aug 2026
Marubayashi, Koga, Ibaraki, Japan
4 AM10th Aug 2026
6 PM
3 AM11th Aug 2026
38AQI
21AQI
44AQI
23AQI
In the last 24 hours,
Marubayashi's AQI reached its highest point of 44 at 8 PM during the Night, while the lowest point, 21, was recorded at 1 PM during the Day between 10th Aug and 11th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Marubayashi, Koga, Ibaraki, Japan
27°C24/31°C
30°C24/36°C
31°C26/37°C
30°C26/36°C
27°C25/30°C
27°C24/29°C
28°C24/33°C
32°C26/37°C
32°C27/38°C
32°C27/39°C
31°C26/38°C
27°C25/33°C
28°C24/34°C
27°C25/32°C
25°C22/31°C
25°C23/30°C
28°C23/34°C
30°C25/36°C
29°C26/33°C
30°C25/36°C
29°C23/35°C
23°C22/25°C
24°C20/29°C
26°C21/32°C
28°C25/33°C
30°C25/35°C
30°C26/36°C
28°C24/33°C
26°C23/31°C
22°C20/26°C
36AQI
32AQI
36AQI
33AQI
2026 Days Vs Air Quality
Marubayashi, Koga, Ibaraki, Japan
87%
194
13%
29
Total number of days with different AQI categories in last 223 days in 2026 (142 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2026, 87% of 223 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
Marubayashi, Koga, Ibaraki, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
23AQI (US)
23AQI (US)
24AQI (US)
22AQI (US)
45AQI (US)
24AQI (US)
38AQI (US)
41AQI (US)
30AQI (US)
44AQI (US)
40AQI (US)
18AQI (US)
36AQI (US)
15AQI (US)
35AQI (US)
50AQI (US)
45AQI (US)
26AQI (US)
44AQI (US)
35AQI (US)
12AQI (US)
18AQI (US)
19AQI (US)
39AQI (US)
44AQI (US)
20AQI (US)
27AQI (US)
21AQI (US)
20AQI (US)
36AQI (US)
38AQI (US)
34AQI (US)
41AQI (US)
30AQI (US)
39AQI (US)
50AQI (US)
51AQI (US)
18AQI (US)
12AQI (US)
32AQI (US)
41AQI (US)
58AQI (US)
35AQI (US)
41AQI (US)
54AQI (US)
72AQI (US)
48AQI (US)
14AQI (US)
31AQI (US)
27AQI (US)
33AQI (US)
44AQI (US)
49AQI (US)
42AQI (US)
34AQI (US)
34AQI (US)
10AQI (US)
30AQI (US)
42AQI (US)
36AQI (US)
65AQI (US)
42AQI (US)
58AQI (US)
59AQI (US)
53AQI (US)
46AQI (US)
42AQI (US)
45AQI (US)
59AQI (US)
60AQI (US)
66AQI (US)
40AQI (US)
32AQI (US)
14AQI (US)
31AQI (US)
54AQI (US)
58AQI (US)
43AQI (US)
32AQI (US)
50AQI (US)
51AQI (US)
51AQI (US)
44AQI (US)
67AQI (US)
22AQI (US)
18AQI (US)
47AQI (US)
52AQI (US)
58AQI (US)
28AQI (US)
16AQI (US)
23AQI (US)
47AQI (US)
51AQI (US)
36AQI (US)
20AQI (US)
39AQI (US)
22AQI (US)
33AQI (US)
45AQI (US)
36AQI (US)
29AQI (US)
32AQI (US)
36AQI (US)
35AQI (US)
32AQI (US)
35AQI (US)
32AQI (US)
32AQI (US)
33AQI (US)
38AQI (US)
46AQI (US)
35AQI (US)
31AQI (US)
44AQI (US)
50AQI (US)
48AQI (US)
41AQI (US)
37AQI (US)
39AQI (US)
47AQI (US)
50AQI (US)
47AQI (US)
27AQI (US)
22AQI (US)
29AQI (US)
29AQI (US)
24AQI (US)
24AQI (US)
27AQI (US)
28AQI (US)
34AQI (US)
37AQI (US)
31AQI (US)
33AQI (US)
86AQI (US)
68AQI (US)
53AQI (US)
49AQI (US)
62AQI (US)
59AQI (US)
60AQI (US)
52AQI (US)
58AQI (US)
48AQI (US)
39AQI (US)
23AQI (US)
15AQI (US)
23AQI (US)
23AQI (US)
25AQI (US)
30AQI (US)
29AQI (US)
12AQI (US)
22AQI (US)
21AQI (US)
19AQI (US)
20AQI (US)
20AQI (US)
23AQI (US)
22AQI (US)
24AQI (US)
22AQI (US)
26AQI (US)
49AQI (US)
16AQI (US)
18AQI (US)
24AQI (US)
24AQI (US)
27AQI (US)
22AQI (US)
19AQI (US)
19AQI (US)
21AQI (US)
21AQI (US)
26AQI (US)
29AQI (US)
26AQI (US)
26AQI (US)
25AQI (US)
24AQI (US)
25AQI (US)
19AQI (US)
16AQI (US)
32AQI (US)
22AQI (US)
24AQI (US)
25AQI (US)
19AQI (US)
22AQI (US)
26AQI (US)
24AQI (US)
25AQI (US)
37AQI (US)
44AQI (US)
40AQI (US)
55AQI (US)
44AQI (US)
26AQI (US)
29AQI (US)
30AQI (US)
44AQI (US)
57AQI (US)
45AQI (US)
29AQI (US)
30AQI (US)
28AQI (US)
27AQI (US)
30AQI (US)
31AQI (US)
28AQI (US)
45AQI (US)
42AQI (US)
49AQI (US)
14AQI (US)
23AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
30AQI (US)
33AQI (US)
30AQI (US)
30AQI (US)
31AQI (US)
37AQI (US)
46AQI (US)
36AQI (US)
40AQI (US)
24AQI (US)
32AQI (US)
30AQI (US)
No. of days
202635AQI (US)
Highest AQI (US) recorded in
March46AQI (US)
Lowest AQI (US) recorded in
June24AQI (US)
202540AQI (US)
Highest AQI (US) recorded in
October50AQI (US)
Lowest AQI (US) recorded in
May30AQI (US)
202434AQI (US)
Highest AQI (US) recorded in
July43AQI (US)
Lowest AQI (US) recorded in
August26AQI (US)
202337AQI (US)
Highest AQI (US) recorded in
April43AQI (US)
Lowest AQI (US) recorded in
August29AQI (US)
202236AQI (US)
Highest AQI (US) recorded in
January40AQI (US)
Lowest AQI (US) recorded in
September29AQI (US)
202137AQI (US)
Highest AQI (US) recorded in
December43AQI (US)
Lowest AQI (US) recorded in
March31AQI (US)
202035AQI (US)
Highest AQI (US) recorded in
November45AQI (US)
Lowest AQI (US) recorded in
December25AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Marubayashi's annual 2026 AQI (US) (35) shows an average percentage change of -3.8% (improved AQI (US)) compared to previous years: 2020 (35), 2021 (37), 2022 (36), 2023 (37), 2024 (34), 2025 (40).