Ogawa, Nasukarasuyama, Tochigi, 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
Ogawa, Nasukarasuyama, Tochigi, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (15th October ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 1st highest AQI at 47 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 15th Oct - 16th Oct 2025
Ogawa, Nasukarasuyama, Tochigi, Japan
5 AM15th Oct 2025
5 PM
4 AM16th Oct 2025
55AQI
40AQI
57AQI
49AQI
In the last 24 hours,
Ogawa's AQI reached its highest point of 57 at 1 AM during the Night, while the lowest point, 40, was recorded at 11 AM during the Day between 15th Oct and 16th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Ogawa, Nasukarasuyama, Tochigi, Japan
25°C20/31°C
26°C22/32°C
23°C17/31°C
19°C16/24°C
19°C16/21°C
21°C17/26°C
18°C13/24°C
17°C13/23°C
18°C13/23°C
20°C16/26°C
22°C18/29°C
21°C16/27°C
19°C15/24°C
22°C17/29°C
19°C15/25°C
18°C16/19°C
18°C13/25°C
18°C13/24°C
19°C14/22°C
21°C17/26°C
22°C17/27°C
17°C15/18°C
20°C15/26°C
17°C12/18°C
16°C11/21°C
14°C14/15°C
18°C13/24°C
18°C14/21°C
14°C12/16°C
16°C11/22°C
--°C/°C
42AQI
42AQI
42AQI
42AQI
2025 Days Vs Air Quality
Ogawa, Nasukarasuyama, Tochigi, Japan
87%
251
13%
37
Total number of days with different AQI categories in last 289 days in 2025 (76 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 289 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
Ogawa, Nasukarasuyama, Tochigi, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
28AQI
28AQI
25AQI
26AQI
26AQI
43AQI
26AQI
29AQI
25AQI
26AQI
24AQI
27AQI
31AQI
28AQI
29AQI
26AQI
26AQI
25AQI
42AQI
38AQI
37AQI
34AQI
37AQI
36AQI
32AQI
30AQI
28AQI
34AQI
28AQI
28AQI
29AQI
28AQI
32AQI
30AQI
31AQI
31AQI
29AQI
29AQI
30AQI
28AQI
29AQI
31AQI
33AQI
32AQI
30AQI
31AQI
37AQI
36AQI
32AQI
31AQI
31AQI
31AQI
31AQI
32AQI
33AQI
34AQI
36AQI
37AQI
46AQI
48AQI
53AQI
37AQI
37AQI
28AQI
31AQI
33AQI
34AQI
34AQI
37AQI
41AQI
42AQI
44AQI
33AQI
35AQI
23AQI
21AQI
23AQI
19AQI
25AQI
37AQI
47AQI
51AQI
50AQI
67AQI
62AQI
67AQI
50AQI
37AQI
34AQI
30AQI
26AQI
21AQI
20AQI
19AQI
26AQI
25AQI
28AQI
38AQI
27AQI
43AQI
40AQI
38AQI
26AQI
25AQI
26AQI
22AQI
41AQI
51AQI
62AQI
59AQI
43AQI
51AQI
29AQI
34AQI
33AQI
46AQI
46AQI
51AQI
33AQI
40AQI
40AQI
27AQI
33AQI
32AQI
34AQI
29AQI
25AQI
29AQI
34AQI
20AQI
22AQI
22AQI
35AQI
38AQI
45AQI
50AQI
32AQI
41AQI
42AQI
56AQI
63AQI
51AQI
47AQI
41AQI
30AQI
29AQI
29AQI
27AQI
33AQI
28AQI
20AQI
23AQI
35AQI
36AQI
32AQI
37AQI
49AQI
53AQI
62AQI
55AQI
49AQI
40AQI
42AQI
41AQI
38AQI
29AQI
33AQI
37AQI
38AQI
41AQI
40AQI
40AQI
44AQI
42AQI
41AQI
37AQI
34AQI
39AQI
38AQI
41AQI
47AQI
49AQI
50AQI
54AQI
52AQI
55AQI
57AQI
67AQI
70AQI
72AQI
57AQI
47AQI
48AQI
51AQI
40AQI
39AQI
42AQI
39AQI
38AQI
37AQI
40AQI
42AQI
44AQI
45AQI
49AQI
51AQI
50AQI
48AQI
46AQI
46AQI
40AQI
41AQI
36AQI
38AQI
42AQI
51AQI
49AQI
44AQI
36AQI
36AQI
36AQI
36AQI
33AQI
31AQI
31AQI
31AQI
34AQI
38AQI
38AQI
42AQI
41AQI
46AQI
46AQI
46AQI
48AQI
52AQI
51AQI
54AQI
48AQI
45AQI
46AQI
50AQI
48AQI
46AQI
38AQI
35AQI
32AQI
27AQI
29AQI
29AQI
34AQI
36AQI
36AQI
31AQI
31AQI
31AQI
37AQI
36AQI
40AQI
41AQI
37AQI
30AQI
28AQI
25AQI
25AQI
24AQI
24AQI
38AQI
45AQI
32AQI
36AQI
35AQI
29AQI
39AQI
44AQI
50AQI
57AQI
50AQI
56AQI
50AQI
57AQI
55AQI
54AQI
51AQI
40AQI
52AQI
48AQI
47AQI
30AQI
32AQI
39AQI
36AQI
35AQI
40AQI
49AQI
42AQI
33AQI
50AQI
No. of days
202538AQI
Highest AQI recorded in
October50AQI
Lowest AQI recorded in
January30AQI
202433AQI
Highest AQI recorded in
July46AQI
Lowest AQI recorded in
March17AQI
202323AQI
Highest AQI recorded in
December24AQI
Lowest AQI recorded in
November15AQI
202050AQI
Highest AQI recorded in
September50AQI
Lowest AQI recorded in
September50AQI
Most & Least Polluted Years Over the Last 4 Years
Ogawa's annual 2025 AQI (38) shows an average percentage change of 18.7% (worsened AQI) compared to previous years: 2020 (50), 2023 (23), 2024 (33).