Sayama, Osaka, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Sayama, Osaka, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (24th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 33 of Good air quality, showing improvement over 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 25th Sep - 26th Sep 2025
Sayama, Osaka, Japan
5 AM25th Sep 2025
6 PM
4 AM26th Sep 2025
AQI
AQI
42AQI
23AQI
In the last 24 hours,
Sayama's AQI reached its highest point of 42 at 3 PM during the Night, while the lowest point, 23, was recorded at 4 AM during the Night between 25th Sep and 26th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Sayama, Osaka, Japan
29°C26/33°C
29°C25/33°C
29°C27/33°C
30°C27/34°C
31°C27/35°C
30°C27/35°C
30°C27/34°C
30°C27/34°C
26°C24/27°C
26°C25/29°C
28°C24/32°C
28°C25/32°C
29°C26/32°C
29°C27/33°C
29°C26/34°C
27°C24/30°C
27°C24/31°C
28°C25/32°C
28°C26/32°C
29°C26/33°C
29°C26/33°C
29°C26/33°C
27°C24/31°C
26°C23/30°C
27°C24/30°C
25°C22/29°C
24°C20/28°C
23°C21/25°C
25°C23/29°C
--°C/°C
--°C/°C
39AQI
35AQI
39AQI
37AQI
2025 Days Vs Air Quality
Sayama, Osaka, Japan
73%
194
27%
73
Total number of days with different AQI categories in last 268 days in 2025 (97 days remaining)
Under WHO’s Safe Air Quality Limits: 73%
Health Risk Level:
Low
In 2025, 73% of 268 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
Sayama, Osaka, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
29AQI
36AQI
31AQI
32AQI
34AQI
40AQI
33AQI
33AQI
31AQI
27AQI
28AQI
36AQI
39AQI
49AQI
44AQI
39AQI
34AQI
35AQI
37AQI
45AQI
42AQI
54AQI
69AQI
65AQI
45AQI
40AQI
46AQI
37AQI
37AQI
40AQI
68AQI
66AQI
46AQI
49AQI
40AQI
41AQI
33AQI
36AQI
31AQI
30AQI
32AQI
30AQI
48AQI
31AQI
47AQI
29AQI
54AQI
38AQI
39AQI
31AQI
31AQI
30AQI
36AQI
35AQI
33AQI
38AQI
38AQI
62AQI
66AQI
77AQI
98AQI
52AQI
47AQI
36AQI
40AQI
35AQI
40AQI
37AQI
44AQI
34AQI
44AQI
51AQI
46AQI
39AQI
26AQI
39AQI
31AQI
29AQI
42AQI
55AQI
60AQI
66AQI
70AQI
71AQI
75AQI
53AQI
43AQI
40AQI
35AQI
37AQI
34AQI
43AQI
25AQI
30AQI
39AQI
40AQI
46AQI
45AQI
51AQI
52AQI
51AQI
52AQI
33AQI
47AQI
26AQI
42AQI
47AQI
54AQI
57AQI
44AQI
42AQI
48AQI
36AQI
34AQI
57AQI
53AQI
56AQI
45AQI
50AQI
60AQI
55AQI
41AQI
47AQI
38AQI
43AQI
26AQI
32AQI
30AQI
34AQI
30AQI
32AQI
48AQI
52AQI
56AQI
53AQI
51AQI
43AQI
52AQI
53AQI
60AQI
42AQI
37AQI
50AQI
33AQI
27AQI
30AQI
30AQI
30AQI
39AQI
32AQI
37AQI
42AQI
47AQI
28AQI
44AQI
43AQI
45AQI
51AQI
60AQI
43AQI
33AQI
33AQI
46AQI
51AQI
36AQI
31AQI
38AQI
37AQI
48AQI
51AQI
56AQI
53AQI
48AQI
43AQI
41AQI
40AQI
39AQI
51AQI
51AQI
53AQI
56AQI
58AQI
71AQI
79AQI
92AQI
83AQI
73AQI
70AQI
73AQI
79AQI
65AQI
58AQI
57AQI
54AQI
46AQI
51AQI
55AQI
42AQI
43AQI
38AQI
36AQI
33AQI
37AQI
38AQI
35AQI
32AQI
31AQI
28AQI
33AQI
40AQI
43AQI
43AQI
45AQI
44AQI
48AQI
61AQI
50AQI
53AQI
47AQI
48AQI
50AQI
46AQI
38AQI
36AQI
39AQI
45AQI
46AQI
44AQI
43AQI
45AQI
44AQI
45AQI
43AQI
40AQI
48AQI
54AQI
55AQI
56AQI
54AQI
53AQI
55AQI
56AQI
55AQI
40AQI
34AQI
38AQI
27AQI
23AQI
27AQI
33AQI
35AQI
37AQI
35AQI
29AQI
30AQI
28AQI
38AQI
33AQI
44AQI
51AQI
36AQI
36AQI
43AQI
30AQI
33AQI
36AQI
33AQI
40AQI
40AQI
48AQI
45AQI
41AQI
45AQI
52AQI
48AQI
35AQI
No. of days
202544AQI
Highest AQI recorded in
July52AQI
Lowest AQI recorded in
September35AQI
202438AQI
Highest AQI recorded in
April49AQI
Lowest AQI recorded in
December32AQI
202342AQI
Highest AQI recorded in
April50AQI
Lowest AQI recorded in
August31AQI
202241AQI
Highest AQI recorded in
May49AQI
Lowest AQI recorded in
August20AQI
202140AQI
Highest AQI recorded in
June48AQI
Lowest AQI recorded in
August34AQI
202040AQI
Highest AQI recorded in
August60AQI
Lowest AQI recorded in
July31AQI
Most & Least Polluted Years Over the Last 6 Years
Sayama's annual 2025 AQI (44) shows an average percentage change of 10.1% (worsened AQI) compared to previous years: 2020 (40), 2021 (40), 2022 (41), 2023 (42), 2024 (38).