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 (4th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 46 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Aug - 5th Aug 2025
Marubayashi, Koga, Ibaraki, Japan
4 AM4th Aug 2025
6 PM
3 AM5th Aug 2025
86AQI
41AQI
72AQI
40AQI
In the last 24 hours,
Marubayashi's AQI reached its highest point of 86 at 5 PM during the Day, while the lowest point, 40, was recorded at 3 AM during the Night between 4th Aug and 5th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Marubayashi, Koga, Ibaraki, Japan
31°C26/36°C
31°C28/36°C
32°C28/37°C
32°C28/37°C
29°C23/37°C
23°C22/25°C
24°C21/28°C
27°C23/32°C
25°C24/28°C
27°C26/31°C
28°C25/31°C
29°C27/33°C
29°C26/34°C
29°C25/34°C
30°C26/36°C
32°C27/38°C
32°C27/38°C
32°C27/38°C
32°C27/38°C
32°C28/38°C
32°C27/38°C
32°C27/38°C
32°C27/39°C
32°C28/39°C
30°C26/37°C
29°C25/35°C
28°C25/32°C
32°C27/38°C
32°C28/38°C
33°C28/38°C
--°C/°C
48AQI
41AQI
47AQI
43AQI
2025 Days Vs Air Quality
Marubayashi, Koga, Ibaraki, Japan
94%
202
6%
14
Total number of days with different AQI categories in last 217 days in 2025 (148 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 217 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Marubayashi, Koga, Ibaraki, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
31AQI
29AQI
24AQI
26AQI
32AQI
50AQI
35AQI
37AQI
31AQI
29AQI
27AQI
39AQI
29AQI
37AQI
35AQI
33AQI
31AQI
36AQI
53AQI
38AQI
42AQI
38AQI
42AQI
43AQI
35AQI
33AQI
36AQI
40AQI
32AQI
32AQI
29AQI
39AQI
30AQI
35AQI
30AQI
32AQI
29AQI
30AQI
30AQI
30AQI
30AQI
30AQI
41AQI
35AQI
33AQI
31AQI
37AQI
35AQI
32AQI
31AQI
31AQI
31AQI
31AQI
34AQI
33AQI
34AQI
37AQI
40AQI
49AQI
47AQI
55AQI
40AQI
37AQI
28AQI
31AQI
31AQI
38AQI
34AQI
37AQI
38AQI
41AQI
40AQI
31AQI
35AQI
21AQI
21AQI
22AQI
18AQI
23AQI
37AQI
46AQI
49AQI
48AQI
63AQI
62AQI
66AQI
49AQI
36AQI
33AQI
30AQI
25AQI
21AQI
20AQI
21AQI
24AQI
22AQI
25AQI
32AQI
25AQI
40AQI
35AQI
34AQI
24AQI
28AQI
23AQI
23AQI
39AQI
48AQI
57AQI
50AQI
38AQI
45AQI
27AQI
35AQI
31AQI
38AQI
40AQI
42AQI
29AQI
39AQI
34AQI
24AQI
27AQI
30AQI
29AQI
26AQI
22AQI
27AQI
28AQI
19AQI
20AQI
20AQI
32AQI
37AQI
37AQI
43AQI
24AQI
38AQI
34AQI
52AQI
49AQI
44AQI
42AQI
37AQI
29AQI
27AQI
23AQI
23AQI
28AQI
20AQI
17AQI
19AQI
29AQI
28AQI
25AQI
32AQI
41AQI
46AQI
55AQI
48AQI
33AQI
29AQI
38AQI
37AQI
32AQI
29AQI
37AQI
43AQI
38AQI
41AQI
39AQI
33AQI
27AQI
28AQI
31AQI
25AQI
29AQI
32AQI
32AQI
40AQI
45AQI
44AQI
48AQI
49AQI
47AQI
51AQI
59AQI
73AQI
74AQI
75AQI
58AQI
45AQI
47AQI
49AQI
39AQI
36AQI
37AQI
37AQI
34AQI
34AQI
33AQI
38AQI
41AQI
43AQI
44AQI
43AQI
45AQI
39AQI
40AQI
39AQI
33AQI
33AQI
34AQI
40AQI
43AQI
46AQI
35AQI
34AQI
38AQI
33AQI
30AQI
35AQI
45AQI
41AQI
No. of days
202536AQI
Highest AQI recorded in
July45AQI
Lowest AQI recorded in
May30AQI
202434AQI
Highest AQI recorded in
July43AQI
Lowest AQI recorded in
August26AQI
202337AQI
Highest AQI recorded in
April43AQI
Lowest AQI recorded in
August29AQI
202236AQI
Highest AQI recorded in
January40AQI
Lowest AQI recorded in
September29AQI
202137AQI
Highest AQI recorded in
December43AQI
Lowest AQI recorded in
March31AQI
202035AQI
Highest AQI recorded in
November45AQI
Lowest AQI recorded in
December25AQI
Most & Least Polluted Years Over the Last 6 Years
Marubayashi's annual 2025 AQI (36) shows an average percentage change of 0.5% (worsened AQI) compared to previous years: 2020 (35), 2021 (37), 2022 (36), 2023 (37), 2024 (34).