Nawamachi, Obu, Aichi, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Nawamachi, Obu, Aichi, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (4th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 63 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Oct - 5th Oct 2025
Nawamachi, Obu, Aichi, Japan
5 AM4th Oct 2025
5 PM
4 AM5th Oct 2025
66AQI
53AQI
55AQI
46AQI
In the last 24 hours,
Nawamachi's AQI reached its highest point of 66 at 7 AM during the Day, while the lowest point, 46, was recorded at 10 PM during the Night between 4th Oct and 5th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Nawamachi, Obu, Aichi, Japan
25°C23/28°C
27°C24/32°C
28°C25/32°C
30°C26/34°C
30°C27/34°C
28°C26/32°C
26°C24/29°C
26°C24/30°C
27°C24/30°C
28°C25/31°C
29°C26/34°C
29°C26/33°C
29°C26/34°C
28°C25/33°C
25°C23/28°C
24°C23/25°C
26°C23/30°C
23°C20/27°C
23°C21/26°C
24°C21/27°C
26°C23/29°C
27°C23/32°C
25°C22/30°C
25°C23/28°C
25°C22/28°C
24°C20/27°C
23°C21/26°C
23°C19/27°C
24°C22/27°C
22°C21/24°C
--°C/°C
36AQI
36AQI
34AQI
33AQI
2025 Days Vs Air Quality
Nawamachi, Obu, Aichi, Japan
90%
249
10%
28
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 278 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
Nawamachi, Obu, Aichi, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
27AQI
28AQI
29AQI
27AQI
25AQI
23AQI
25AQI
25AQI
25AQI
21AQI
24AQI
24AQI
26AQI
30AQI
29AQI
24AQI
27AQI
25AQI
27AQI
29AQI
31AQI
31AQI
40AQI
36AQI
38AQI
33AQI
28AQI
29AQI
30AQI
28AQI
34AQI
37AQI
27AQI
30AQI
29AQI
29AQI
29AQI
28AQI
27AQI
28AQI
28AQI
30AQI
24AQI
31AQI
27AQI
29AQI
29AQI
32AQI
29AQI
29AQI
28AQI
28AQI
29AQI
30AQI
31AQI
30AQI
35AQI
38AQI
37AQI
39AQI
38AQI
33AQI
27AQI
23AQI
30AQI
30AQI
30AQI
34AQI
34AQI
28AQI
26AQI
34AQI
22AQI
22AQI
17AQI
16AQI
17AQI
15AQI
21AQI
32AQI
33AQI
40AQI
41AQI
55AQI
81AQI
68AQI
44AQI
35AQI
32AQI
34AQI
26AQI
25AQI
18AQI
18AQI
21AQI
17AQI
21AQI
23AQI
20AQI
32AQI
28AQI
27AQI
20AQI
25AQI
19AQI
22AQI
28AQI
36AQI
35AQI
34AQI
24AQI
24AQI
16AQI
15AQI
28AQI
26AQI
29AQI
26AQI
27AQI
31AQI
25AQI
22AQI
21AQI
20AQI
19AQI
16AQI
15AQI
17AQI
16AQI
15AQI
16AQI
20AQI
22AQI
26AQI
25AQI
23AQI
20AQI
25AQI
27AQI
34AQI
32AQI
25AQI
25AQI
22AQI
18AQI
18AQI
18AQI
16AQI
20AQI
17AQI
17AQI
16AQI
21AQI
16AQI
20AQI
20AQI
21AQI
26AQI
31AQI
22AQI
20AQI
19AQI
22AQI
22AQI
19AQI
18AQI
21AQI
23AQI
25AQI
28AQI
31AQI
26AQI
19AQI
17AQI
17AQI
18AQI
17AQI
19AQI
18AQI
21AQI
38AQI
49AQI
70AQI
76AQI
70AQI
77AQI
65AQI
68AQI
76AQI
83AQI
66AQI
56AQI
55AQI
54AQI
46AQI
50AQI
48AQI
43AQI
40AQI
34AQI
33AQI
32AQI
33AQI
33AQI
34AQI
26AQI
25AQI
25AQI
31AQI
37AQI
39AQI
37AQI
44AQI
45AQI
47AQI
65AQI
52AQI
53AQI
46AQI
41AQI
48AQI
39AQI
36AQI
36AQI
36AQI
37AQI
39AQI
39AQI
41AQI
44AQI
48AQI
47AQI
49AQI
47AQI
50AQI
55AQI
56AQI
54AQI
53AQI
50AQI
55AQI
54AQI
53AQI
42AQI
35AQI
37AQI
30AQI
26AQI
27AQI
32AQI
36AQI
38AQI
34AQI
28AQI
29AQI
27AQI
34AQI
33AQI
45AQI
51AQI
40AQI
33AQI
38AQI
27AQI
30AQI
33AQI
32AQI
39AQI
34AQI
31AQI
32AQI
24AQI
18AQI
32AQI
40AQI
55AQI
63AQI
28AQI
30AQI
33AQI
25AQI
21AQI
22AQI
49AQI
47AQI
33AQI
48AQI
No. of days
202532AQI
Highest AQI recorded in
July49AQI
Lowest AQI recorded in
May21AQI
202434AQI
Highest AQI recorded in
April49AQI
Lowest AQI recorded in
December25AQI
202338AQI
Highest AQI recorded in
April48AQI
Lowest AQI recorded in
August26AQI
202233AQI
Highest AQI recorded in
March48AQI
Lowest AQI recorded in
August18AQI
202125AQI
Highest AQI recorded in
June38AQI
Lowest AQI recorded in
January17AQI
202017AQI
Highest AQI recorded in
August22AQI
Lowest AQI recorded in
May14AQI
Most & Least Polluted Years Over the Last 6 Years
Nawamachi's annual 2025 AQI (32) shows an average percentage change of 20.05% (worsened AQI) compared to previous years: 2020 (17), 2021 (25), 2022 (33), 2023 (38), 2024 (34).