Nakano, Aizawa, Kanagawa, 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
Nakano, Aizawa, Kanagawa, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (27th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 51 of Moderate air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 28th Sep - 29th Sep 2025
Nakano, Aizawa, Kanagawa, Japan
5 AM28th Sep 2025
5 PM
4 AM29th Sep 2025
AQI
AQI
48AQI
26AQI
In the last 24 hours,
Nakano's AQI reached its highest point of 48 at 10 AM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 28th Sep and 29th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Nakano, Aizawa, Kanagawa, Japan
31°C26/36°C
31°C28/35°C
30°C26/36°C
31°C26/36°C
29°C26/35°C
25°C25/25°C
23°C22/24°C
25°C22/30°C
27°C23/32°C
29°C25/34°C
28°C26/32°C
28°C25/31°C
26°C23/29°C
24°C23/25°C
26°C23/29°C
28°C25/32°C
27°C25/31°C
28°C25/31°C
29°C25/34°C
29°C23/36°C
21°C20/22°C
22°C21/23°C
25°C21/30°C
22°C20/25°C
22°C19/25°C
22°C19/26°C
23°C19/28°C
26°C23/31°C
23°C22/26°C
--°C/°C
--°C/°C
39AQI
36AQI
39AQI
36AQI
2025 Days Vs Air Quality
Nakano, Aizawa, Kanagawa, Japan
91%
246
9%
24
Total number of days with different AQI categories in last 271 days in 2025 (94 days remaining)
Under WHO’s Safe Air Quality Limits: 91%
Health Risk Level:
Very Low
In 2025, 91% of 271 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
Nakano, Aizawa, Kanagawa, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
26AQI
27AQI
23AQI
24AQI
22AQI
34AQI
24AQI
30AQI
27AQI
25AQI
25AQI
24AQI
27AQI
23AQI
28AQI
22AQI
24AQI
24AQI
25AQI
25AQI
28AQI
30AQI
34AQI
34AQI
32AQI
31AQI
26AQI
27AQI
29AQI
27AQI
25AQI
25AQI
23AQI
23AQI
26AQI
28AQI
28AQI
29AQI
29AQI
29AQI
27AQI
29AQI
26AQI
29AQI
26AQI
28AQI
30AQI
33AQI
30AQI
29AQI
29AQI
30AQI
28AQI
32AQI
30AQI
33AQI
33AQI
36AQI
38AQI
49AQI
42AQI
39AQI
29AQI
24AQI
26AQI
30AQI
28AQI
32AQI
31AQI
30AQI
27AQI
32AQI
22AQI
19AQI
17AQI
16AQI
16AQI
15AQI
17AQI
23AQI
25AQI
28AQI
32AQI
47AQI
62AQI
56AQI
38AQI
31AQI
31AQI
27AQI
21AQI
20AQI
18AQI
18AQI
19AQI
16AQI
17AQI
19AQI
19AQI
23AQI
22AQI
23AQI
20AQI
22AQI
20AQI
20AQI
26AQI
31AQI
33AQI
32AQI
26AQI
24AQI
18AQI
16AQI
20AQI
22AQI
21AQI
20AQI
16AQI
20AQI
21AQI
18AQI
18AQI
21AQI
20AQI
18AQI
18AQI
17AQI
18AQI
15AQI
17AQI
17AQI
19AQI
19AQI
21AQI
22AQI
19AQI
22AQI
23AQI
54AQI
38AQI
34AQI
30AQI
27AQI
20AQI
22AQI
25AQI
18AQI
20AQI
18AQI
15AQI
15AQI
17AQI
17AQI
18AQI
20AQI
21AQI
38AQI
28AQI
30AQI
26AQI
25AQI
27AQI
27AQI
25AQI
24AQI
25AQI
31AQI
32AQI
31AQI
28AQI
22AQI
12AQI
14AQI
17AQI
18AQI
16AQI
22AQI
20AQI
28AQI
44AQI
46AQI
49AQI
52AQI
48AQI
55AQI
62AQI
76AQI
74AQI
76AQI
58AQI
47AQI
53AQI
51AQI
40AQI
37AQI
40AQI
38AQI
34AQI
30AQI
31AQI
36AQI
37AQI
43AQI
46AQI
43AQI
42AQI
40AQI
37AQI
47AQI
37AQI
39AQI
36AQI
43AQI
47AQI
62AQI
52AQI
51AQI
47AQI
41AQI
46AQI
37AQI
36AQI
36AQI
35AQI
38AQI
43AQI
43AQI
41AQI
43AQI
46AQI
48AQI
49AQI
49AQI
48AQI
55AQI
57AQI
56AQI
51AQI
49AQI
52AQI
56AQI
54AQI
44AQI
39AQI
38AQI
34AQI
25AQI
29AQI
31AQI
39AQI
41AQI
37AQI
31AQI
33AQI
33AQI
42AQI
36AQI
43AQI
51AQI
47AQI
35AQI
31AQI
29AQI
29AQI
29AQI
30AQI
31AQI
50AQI
51AQI
27AQI
29AQI
30AQI
21AQI
22AQI
24AQI
47AQI
47AQI
37AQI
No. of days
202532AQI
Highest AQI recorded in
August47AQI
Lowest AQI recorded in
April21AQI
202433AQI
Highest AQI recorded in
April47AQI
Lowest AQI recorded in
December24AQI
202337AQI
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
January26AQI
202230AQI
Highest AQI recorded in
March36AQI
Lowest AQI recorded in
October23AQI
202125AQI
Highest AQI recorded in
August36AQI
Lowest AQI recorded in
February10AQI
202026AQI
Highest AQI recorded in
August54AQI
Lowest AQI recorded in
December8AQI
Most & Least Polluted Years Over the Last 6 Years
Nakano's annual 2025 AQI (32) shows an average percentage change of 6.8% (worsened AQI) compared to previous years: 2020 (26), 2021 (25), 2022 (30), 2023 (37), 2024 (33).