Horigomecho, Sano, Tochigi, 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
Horigomecho, Sano, Tochigi, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (29th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 41 of Good air quality, showing improvement over 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 30th Sep - 1st Oct 2025
Horigomecho, Sano, Tochigi, Japan
5 AM30th Sep 2025
5 PM
4 AM1st Oct 2025
AQI
AQI
55AQI
33AQI
In the last 24 hours,
Horigomecho's AQI reached its highest point of 55 at 8 PM during the Night, while the lowest point, undefined, was recorded at 4 AM during the Night between 30th Sep and 1st Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Horigomecho, Sano, Tochigi, Japan
31°C26/37°C
32°C27/39°C
29°C25/36°C
26°C24/30°C
24°C22/24°C
27°C21/33°C
29°C24/34°C
29°C25/35°C
28°C25/34°C
26°C24/29°C
25°C22/28°C
23°C21/26°C
24°C21/27°C
27°C23/33°C
28°C24/32°C
28°C24/34°C
30°C26/36°C
28°C21/36°C
21°C19/23°C
22°C20/24°C
25°C21/31°C
22°C19/26°C
21°C18/26°C
21°C18/26°C
24°C19/29°C
26°C22/32°C
25°C21/30°C
23°C21/26°C
26°C22/34°C
--°C/°C
--°C/°C
36AQI
30AQI
35AQI
35AQI
2025 Days Vs Air Quality
Horigomecho, Sano, Tochigi, Japan
86%
233
14%
39
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 86%
Health Risk Level:
Low
In 2025, 86% of 273 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
Horigomecho, Sano, Tochigi, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
30AQI
30AQI
26AQI
25AQI
33AQI
54AQI
34AQI
36AQI
29AQI
27AQI
24AQI
34AQI
27AQI
36AQI
36AQI
33AQI
32AQI
33AQI
46AQI
45AQI
46AQI
43AQI
44AQI
52AQI
37AQI
35AQI
34AQI
40AQI
31AQI
32AQI
29AQI
34AQI
38AQI
42AQI
33AQI
34AQI
29AQI
31AQI
31AQI
30AQI
30AQI
31AQI
37AQI
35AQI
32AQI
31AQI
41AQI
38AQI
33AQI
31AQI
31AQI
32AQI
33AQI
33AQI
33AQI
35AQI
38AQI
41AQI
50AQI
56AQI
56AQI
41AQI
40AQI
32AQI
34AQI
32AQI
41AQI
38AQI
38AQI
46AQI
52AQI
47AQI
39AQI
44AQI
25AQI
23AQI
26AQI
18AQI
26AQI
39AQI
49AQI
55AQI
56AQI
72AQI
66AQI
73AQI
56AQI
36AQI
37AQI
32AQI
29AQI
22AQI
21AQI
22AQI
29AQI
23AQI
29AQI
41AQI
30AQI
45AQI
40AQI
41AQI
27AQI
25AQI
25AQI
24AQI
44AQI
53AQI
67AQI
60AQI
47AQI
54AQI
31AQI
41AQI
36AQI
46AQI
47AQI
51AQI
37AQI
48AQI
43AQI
29AQI
31AQI
34AQI
34AQI
28AQI
27AQI
33AQI
33AQI
23AQI
23AQI
21AQI
36AQI
41AQI
43AQI
49AQI
29AQI
41AQI
42AQI
56AQI
64AQI
55AQI
51AQI
45AQI
33AQI
34AQI
30AQI
30AQI
35AQI
27AQI
20AQI
24AQI
35AQI
34AQI
29AQI
38AQI
47AQI
53AQI
65AQI
57AQI
38AQI
35AQI
42AQI
42AQI
37AQI
30AQI
39AQI
48AQI
42AQI
46AQI
45AQI
41AQI
38AQI
38AQI
37AQI
32AQI
32AQI
35AQI
37AQI
39AQI
43AQI
44AQI
44AQI
49AQI
49AQI
52AQI
56AQI
73AQI
77AQI
80AQI
64AQI
52AQI
54AQI
54AQI
43AQI
43AQI
44AQI
41AQI
42AQI
39AQI
39AQI
41AQI
43AQI
45AQI
47AQI
49AQI
51AQI
48AQI
47AQI
48AQI
40AQI
41AQI
34AQI
39AQI
43AQI
52AQI
49AQI
47AQI
38AQI
41AQI
39AQI
37AQI
35AQI
33AQI
32AQI
30AQI
33AQI
33AQI
37AQI
40AQI
40AQI
46AQI
46AQI
46AQI
47AQI
53AQI
54AQI
54AQI
48AQI
44AQI
47AQI
51AQI
49AQI
44AQI
38AQI
35AQI
37AQI
30AQI
27AQI
29AQI
33AQI
36AQI
34AQI
28AQI
28AQI
26AQI
32AQI
33AQI
45AQI
44AQI
39AQI
31AQI
27AQI
25AQI
27AQI
27AQI
29AQI
43AQI
56AQI
45AQI
46AQI
41AQI
35AQI
35AQI
43AQI
38AQI
36AQI
40AQI
50AQI
42AQI
35AQI
No. of days
202539AQI
Highest AQI recorded in
July50AQI
Lowest AQI recorded in
February35AQI
202439AQI
Highest AQI recorded in
April51AQI
Lowest AQI recorded in
October33AQI
202345AQI
Highest AQI recorded in
July56AQI
Lowest AQI recorded in
December35AQI
202244AQI
Highest AQI recorded in
August56AQI
Lowest AQI recorded in
October39AQI
202139AQI
Highest AQI recorded in
June47AQI
Lowest AQI recorded in
April32AQI
202041AQI
Highest AQI recorded in
August58AQI
Lowest AQI recorded in
April29AQI
Most & Least Polluted Years Over the Last 6 Years
Horigomecho's annual 2025 AQI (39) shows an average percentage change of -4.9% (improved AQI) compared to previous years: 2020 (41), 2021 (39), 2022 (44), 2023 (45), 2024 (39).