Nishio, Aichi, 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
Nishio, Aichi, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (20th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 38 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Sep - 21st Sep 2025
Nishio, Aichi, Japan
5 AM20th Sep 2025
6 PM
4 AM21st Sep 2025
42AQI
20AQI
42AQI
29AQI
In the last 24 hours,
Nishio's AQI reached its highest point of 42 at 7 AM during the Day, while the lowest point, 20, was recorded at 1 PM during the Day between 20th Sep and 21st Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Nishio, Aichi, Japan
30°C28/33°C
29°C27/31°C
29°C27/32°C
29°C27/31°C
28°C26/31°C
29°C26/32°C
29°C26/33°C
29°C26/32°C
31°C28/35°C
30°C28/34°C
29°C27/32°C
29°C27/32°C
29°C26/33°C
26°C24/27°C
26°C24/28°C
27°C24/31°C
28°C25/31°C
30°C27/33°C
29°C27/32°C
28°C26/30°C
26°C24/29°C
26°C25/29°C
27°C25/29°C
28°C26/30°C
29°C26/33°C
28°C26/31°C
29°C26/32°C
28°C26/32°C
25°C23/26°C
23°C22/24°C
--°C/°C
43AQI
41AQI
41AQI
39AQI
2025 Days Vs Air Quality
Nishio, Aichi, Japan
91%
239
9%
24
Total number of days with different AQI categories in last 264 days in 2025 (101 days remaining)
Under WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2025, 91% of 264 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
Nishio, Aichi, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
36AQI
41AQI
33AQI
28AQI
26AQI
26AQI
27AQI
25AQI
27AQI
22AQI
24AQI
24AQI
28AQI
31AQI
30AQI
25AQI
27AQI
24AQI
28AQI
27AQI
31AQI
30AQI
39AQI
36AQI
36AQI
31AQI
25AQI
30AQI
28AQI
29AQI
34AQI
37AQI
27AQI
31AQI
29AQI
30AQI
30AQI
31AQI
29AQI
29AQI
28AQI
30AQI
26AQI
32AQI
28AQI
31AQI
30AQI
32AQI
29AQI
30AQI
28AQI
29AQI
30AQI
30AQI
31AQI
32AQI
36AQI
38AQI
39AQI
41AQI
39AQI
31AQI
27AQI
23AQI
30AQI
30AQI
31AQI
35AQI
33AQI
28AQI
27AQI
35AQI
22AQI
21AQI
18AQI
15AQI
16AQI
14AQI
20AQI
30AQI
27AQI
34AQI
33AQI
49AQI
77AQI
64AQI
42AQI
34AQI
37AQI
35AQI
26AQI
27AQI
19AQI
19AQI
19AQI
15AQI
20AQI
19AQI
19AQI
24AQI
25AQI
24AQI
19AQI
23AQI
18AQI
21AQI
23AQI
28AQI
30AQI
26AQI
22AQI
20AQI
15AQI
14AQI
21AQI
21AQI
22AQI
20AQI
21AQI
23AQI
22AQI
18AQI
21AQI
19AQI
19AQI
17AQI
16AQI
17AQI
17AQI
14AQI
15AQI
20AQI
24AQI
25AQI
26AQI
23AQI
20AQI
26AQI
28AQI
35AQI
33AQI
25AQI
24AQI
24AQI
16AQI
18AQI
18AQI
17AQI
19AQI
17AQI
16AQI
16AQI
22AQI
16AQI
21AQI
21AQI
23AQI
26AQI
31AQI
23AQI
21AQI
21AQI
24AQI
25AQI
20AQI
19AQI
22AQI
23AQI
25AQI
27AQI
28AQI
23AQI
16AQI
15AQI
15AQI
16AQI
16AQI
21AQI
19AQI
21AQI
41AQI
50AQI
58AQI
57AQI
57AQI
78AQI
63AQI
72AQI
79AQI
82AQI
56AQI
51AQI
50AQI
50AQI
40AQI
48AQI
49AQI
46AQI
38AQI
34AQI
32AQI
29AQI
30AQI
28AQI
28AQI
23AQI
23AQI
22AQI
27AQI
35AQI
35AQI
35AQI
45AQI
46AQI
47AQI
65AQI
53AQI
54AQI
47AQI
43AQI
50AQI
41AQI
36AQI
37AQI
39AQI
39AQI
40AQI
40AQI
41AQI
45AQI
48AQI
47AQI
50AQI
49AQI
50AQI
55AQI
56AQI
54AQI
54AQI
52AQI
55AQI
56AQI
54AQI
43AQI
35AQI
39AQI
28AQI
27AQI
28AQI
32AQI
38AQI
39AQI
35AQI
30AQI
30AQI
28AQI
35AQI
37AQI
47AQI
51AQI
42AQI
35AQI
38AQI
29AQI
31AQI
32AQI
21AQI
21AQI
22AQI
45AQI
48AQI
36AQI
No. of days
202532AQI
Highest AQI recorded in
August48AQI
Lowest AQI recorded in
May21AQI
202429AQI
Highest AQI recorded in
April34AQI
Lowest AQI recorded in
September24AQI
202326AQI
Highest AQI recorded in
April34AQI
Lowest AQI recorded in
August18AQI
202229AQI
Highest AQI recorded in
May44AQI
Lowest AQI recorded in
November22AQI
202125AQI
Highest AQI recorded in
June35AQI
Lowest AQI recorded in
January12AQI
202014AQI
Highest AQI recorded in
August18AQI
Lowest AQI recorded in
May10AQI
Most & Least Polluted Years Over the Last 6 Years
Nishio's annual 2025 AQI (32) shows an average percentage change of 38.7% (worsened AQI) compared to previous years: 2020 (14), 2021 (25), 2022 (29), 2023 (26), 2024 (29).