Higashikoshigaya, Koshigaya, Saitama, 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
Higashikoshigaya, Koshigaya, Saitama, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (8th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 44 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 9th Aug - 10th Aug 2025
Higashikoshigaya, Koshigaya, Saitama, Japan
4 AM9th Aug 2025
6 PM
3 AM10th Aug 2025
AQI
AQI
52AQI
29AQI
In the last 24 hours,
Higashikoshigaya's AQI reached its highest point of 52 at 5 PM during the Night, while the lowest point, undefined, was recorded at 3 AM during the Night between 9th Aug and 10th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Higashikoshigaya, Koshigaya, Saitama, Japan
24°C22/27°C
24°C22/29°C
27°C24/32°C
26°C25/29°C
27°C26/30°C
28°C26/30°C
29°C27/32°C
29°C26/33°C
29°C26/33°C
30°C27/34°C
31°C28/36°C
31°C28/36°C
31°C28/36°C
31°C28/37°C
32°C29/36°C
32°C28/36°C
31°C29/36°C
32°C28/37°C
32°C28/38°C
30°C27/36°C
29°C26/34°C
28°C26/32°C
31°C27/37°C
32°C28/37°C
33°C29/37°C
34°C30/39°C
33°C29/38°C
31°C28/34°C
29°C25/36°C
--°C/°C
--°C/°C
45AQI
36AQI
45AQI
39AQI
2025 Days Vs Air Quality
Higashikoshigaya, Koshigaya, Saitama, Japan
85%
187
15%
33
Total number of days with different AQI categories in last 221 days in 2025 (144 days remaining)
Under WHO’s Safe Air Quality Limits: 85%
Health Risk Level:
Low
In 2025, 85% of 221 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
Higashikoshigaya, Koshigaya, Saitama, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
33AQI
36AQI
26AQI
30AQI
38AQI
57AQI
33AQI
36AQI
34AQI
30AQI
30AQI
46AQI
32AQI
46AQI
41AQI
36AQI
35AQI
37AQI
55AQI
43AQI
50AQI
44AQI
54AQI
51AQI
45AQI
36AQI
42AQI
47AQI
34AQI
36AQI
30AQI
46AQI
37AQI
44AQI
33AQI
34AQI
28AQI
29AQI
29AQI
29AQI
29AQI
30AQI
45AQI
37AQI
35AQI
33AQI
42AQI
39AQI
34AQI
31AQI
29AQI
30AQI
30AQI
31AQI
32AQI
32AQI
40AQI
43AQI
54AQI
52AQI
64AQI
40AQI
42AQI
30AQI
35AQI
32AQI
38AQI
37AQI
36AQI
43AQI
49AQI
47AQI
44AQI
42AQI
29AQI
22AQI
27AQI
19AQI
26AQI
44AQI
54AQI
58AQI
55AQI
72AQI
76AQI
73AQI
51AQI
39AQI
39AQI
34AQI
30AQI
22AQI
22AQI
22AQI
28AQI
26AQI
33AQI
42AQI
29AQI
49AQI
42AQI
42AQI
32AQI
39AQI
32AQI
31AQI
47AQI
53AQI
65AQI
53AQI
48AQI
48AQI
34AQI
45AQI
48AQI
50AQI
56AQI
49AQI
37AQI
49AQI
41AQI
32AQI
34AQI
39AQI
37AQI
32AQI
27AQI
32AQI
33AQI
24AQI
25AQI
25AQI
36AQI
37AQI
40AQI
47AQI
28AQI
46AQI
44AQI
64AQI
56AQI
45AQI
45AQI
45AQI
32AQI
31AQI
27AQI
28AQI
31AQI
28AQI
18AQI
25AQI
33AQI
38AQI
30AQI
44AQI
47AQI
51AQI
59AQI
52AQI
38AQI
35AQI
41AQI
43AQI
38AQI
33AQI
36AQI
46AQI
42AQI
42AQI
41AQI
36AQI
27AQI
27AQI
25AQI
21AQI
22AQI
28AQI
29AQI
35AQI
39AQI
40AQI
43AQI
46AQI
46AQI
48AQI
58AQI
73AQI
74AQI
82AQI
65AQI
54AQI
55AQI
54AQI
46AQI
45AQI
44AQI
43AQI
39AQI
37AQI
35AQI
37AQI
38AQI
38AQI
39AQI
36AQI
38AQI
36AQI
42AQI
36AQI
31AQI
30AQI
34AQI
41AQI
44AQI
59AQI
49AQI
51AQI
46AQI
44AQI
39AQI
35AQI
44AQI
40AQI
36AQI
37AQI
46AQI
46AQI
No. of days
202540AQI
Highest AQI recorded in
July46AQI
Lowest AQI recorded in
February35AQI
202438AQI
Highest AQI recorded in
April48AQI
Lowest AQI recorded in
August30AQI
202341AQI
Highest AQI recorded in
April48AQI
Lowest AQI recorded in
August25AQI
202240AQI
Highest AQI recorded in
March46AQI
Lowest AQI recorded in
August22AQI
202139AQI
Highest AQI recorded in
December45AQI
Lowest AQI recorded in
February30AQI
202036AQI
Highest AQI recorded in
March44AQI
Lowest AQI recorded in
September24AQI
Most & Least Polluted Years Over the Last 6 Years
Higashikoshigaya's annual 2025 AQI (40) shows an average percentage change of 2.5% (worsened AQI) compared to previous years: 2020 (36), 2021 (39), 2022 (40), 2023 (41), 2024 (38).