Miyanogicho, Yotsukaido, Chiba, 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
Miyanogicho, Yotsukaido, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 61 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 3rd Oct - 4th Oct 2025
Miyanogicho, Yotsukaido, Chiba, Japan
5 AM3rd Oct 2025
5 PM
4 AM4th Oct 2025
AQI
AQI
70AQI
51AQI
In the last 24 hours,
Miyanogicho's AQI reached its highest point of 70 at 12 AM during the Night, while the lowest point, 51, was recorded at 8 PM during the Night between 3rd Oct and 4th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Miyanogicho, Yotsukaido, Chiba, Japan
26°C25/28°C
25°C23/27°C
26°C23/31°C
27°C24/30°C
29°C25/33°C
29°C26/33°C
28°C27/31°C
27°C24/30°C
25°C23/28°C
27°C24/30°C
28°C27/30°C
28°C25/31°C
28°C26/31°C
29°C26/32°C
28°C23/33°C
22°C21/23°C
25°C22/27°C
26°C22/30°C
23°C21/25°C
23°C20/26°C
23°C20/26°C
24°C21/27°C
26°C23/31°C
24°C22/27°C
25°C23/27°C
26°C23/30°C
24°C22/27°C
21°C19/21°C
22°C19/27°C
--°C/°C
--°C/°C
37AQI
35AQI
37AQI
37AQI
2025 Days Vs Air Quality
Miyanogicho, Yotsukaido, Chiba, Japan
89%
247
11%
29
Total number of days with different AQI categories in last 276 days in 2025 (89 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 276 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
Miyanogicho, Yotsukaido, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
36AQI
32AQI
31AQI
33AQI
38AQI
48AQI
33AQI
35AQI
29AQI
34AQI
31AQI
36AQI
28AQI
39AQI
37AQI
31AQI
33AQI
34AQI
56AQI
37AQI
48AQI
41AQI
53AQI
48AQI
42AQI
42AQI
38AQI
40AQI
38AQI
38AQI
34AQI
42AQI
32AQI
41AQI
32AQI
36AQI
32AQI
29AQI
30AQI
33AQI
31AQI
34AQI
32AQI
34AQI
31AQI
32AQI
38AQI
34AQI
33AQI
31AQI
32AQI
31AQI
32AQI
32AQI
37AQI
35AQI
36AQI
42AQI
51AQI
48AQI
59AQI
42AQI
43AQI
28AQI
37AQI
34AQI
35AQI
32AQI
38AQI
40AQI
46AQI
39AQI
39AQI
37AQI
28AQI
22AQI
29AQI
25AQI
27AQI
44AQI
46AQI
58AQI
49AQI
64AQI
79AQI
66AQI
48AQI
40AQI
45AQI
38AQI
33AQI
26AQI
26AQI
23AQI
22AQI
26AQI
27AQI
33AQI
25AQI
42AQI
35AQI
36AQI
27AQI
37AQI
31AQI
30AQI
43AQI
49AQI
55AQI
47AQI
43AQI
41AQI
27AQI
32AQI
34AQI
38AQI
43AQI
37AQI
32AQI
41AQI
35AQI
29AQI
29AQI
36AQI
30AQI
26AQI
24AQI
26AQI
26AQI
21AQI
29AQI
27AQI
35AQI
30AQI
36AQI
40AQI
30AQI
40AQI
40AQI
57AQI
42AQI
41AQI
34AQI
36AQI
29AQI
26AQI
23AQI
22AQI
24AQI
21AQI
16AQI
20AQI
25AQI
28AQI
30AQI
35AQI
41AQI
43AQI
53AQI
38AQI
34AQI
25AQI
35AQI
31AQI
33AQI
38AQI
39AQI
45AQI
35AQI
36AQI
32AQI
35AQI
31AQI
26AQI
25AQI
24AQI
26AQI
33AQI
29AQI
36AQI
34AQI
36AQI
42AQI
43AQI
42AQI
50AQI
69AQI
74AQI
81AQI
73AQI
55AQI
49AQI
51AQI
48AQI
41AQI
38AQI
36AQI
42AQI
37AQI
35AQI
34AQI
35AQI
34AQI
36AQI
38AQI
33AQI
32AQI
30AQI
38AQI
31AQI
31AQI
30AQI
32AQI
41AQI
45AQI
61AQI
51AQI
51AQI
47AQI
47AQI
48AQI
39AQI
38AQI
35AQI
32AQI
36AQI
35AQI
37AQI
39AQI
43AQI
45AQI
48AQI
50AQI
50AQI
48AQI
56AQI
55AQI
53AQI
50AQI
45AQI
51AQI
55AQI
53AQI
42AQI
37AQI
37AQI
35AQI
31AQI
29AQI
30AQI
39AQI
42AQI
37AQI
32AQI
32AQI
28AQI
36AQI
36AQI
36AQI
48AQI
51AQI
35AQI
35AQI
30AQI
28AQI
26AQI
27AQI
32AQI
42AQI
34AQI
30AQI
34AQI
35AQI
46AQI
54AQI
61AQI
38AQI
34AQI
42AQI
35AQI
31AQI
33AQI
43AQI
46AQI
35AQI
54AQI
No. of days
202538AQI
Highest AQI recorded in
October54AQI
Lowest AQI recorded in
May31AQI
202442AQI
Highest AQI recorded in
July77AQI
Lowest AQI recorded in
August33AQI
202342AQI
Highest AQI recorded in
April47AQI
Lowest AQI recorded in
September36AQI
202240AQI
Highest AQI recorded in
April46AQI
Lowest AQI recorded in
January37AQI
202137AQI
Highest AQI recorded in
December43AQI
Lowest AQI recorded in
April29AQI
202036AQI
Highest AQI recorded in
August42AQI
Lowest AQI recorded in
September29AQI
Most & Least Polluted Years Over the Last 6 Years
Miyanogicho's annual 2025 AQI (38) shows an average percentage change of -4.3% (improved AQI) compared to previous years: 2020 (36), 2021 (37), 2022 (40), 2023 (42), 2024 (42).