Hanamigawa, Yachiyo, 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
Hanamigawa, Yachiyo, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (5th October ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 58 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 5th Oct - 6th Oct 2025
Hanamigawa, Yachiyo, Chiba, Japan
5 AM5th Oct 2025
5 PM
4 AM6th Oct 2025
AQI
AQI
71AQI
50AQI
In the last 24 hours,
Hanamigawa's AQI reached its highest point of 71 at 7 PM during the Night, while the lowest point, 50, was recorded at 4 AM during the Night between 5th Oct and 6th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Hanamigawa, Yachiyo, Chiba, Japan
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
23°C21/26°C
23°C22/26°C
--°C/°C
--°C/°C
41AQI
38AQI
38AQI
37AQI
2025 Days Vs Air Quality
Hanamigawa, Yachiyo, Chiba, Japan
88%
245
12%
33
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 278 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
Hanamigawa, Yachiyo, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
36AQI
33AQI
29AQI
30AQI
38AQI
54AQI
31AQI
35AQI
30AQI
30AQI
31AQI
35AQI
30AQI
42AQI
37AQI
34AQI
30AQI
36AQI
56AQI
41AQI
45AQI
41AQI
54AQI
46AQI
40AQI
37AQI
37AQI
39AQI
33AQI
34AQI
29AQI
41AQI
34AQI
41AQI
32AQI
34AQI
29AQI
30AQI
30AQI
30AQI
30AQI
32AQI
33AQI
43AQI
30AQI
45AQI
38AQI
40AQI
32AQI
31AQI
30AQI
31AQI
31AQI
32AQI
35AQI
35AQI
37AQI
41AQI
55AQI
48AQI
62AQI
40AQI
40AQI
26AQI
33AQI
32AQI
34AQI
33AQI
36AQI
41AQI
45AQI
40AQI
41AQI
34AQI
26AQI
20AQI
24AQI
18AQI
24AQI
43AQI
48AQI
55AQI
51AQI
65AQI
80AQI
70AQI
48AQI
38AQI
42AQI
34AQI
29AQI
22AQI
21AQI
22AQI
23AQI
23AQI
29AQI
35AQI
25AQI
45AQI
40AQI
37AQI
28AQI
39AQI
30AQI
31AQI
46AQI
51AQI
61AQI
49AQI
43AQI
43AQI
28AQI
37AQI
36AQI
44AQI
46AQI
41AQI
33AQI
43AQI
37AQI
26AQI
30AQI
36AQI
32AQI
26AQI
23AQI
25AQI
27AQI
22AQI
28AQI
25AQI
33AQI
31AQI
36AQI
40AQI
27AQI
44AQI
38AQI
60AQI
42AQI
43AQI
37AQI
37AQI
29AQI
26AQI
24AQI
22AQI
26AQI
23AQI
16AQI
20AQI
26AQI
28AQI
31AQI
37AQI
44AQI
46AQI
52AQI
41AQI
36AQI
27AQI
36AQI
32AQI
31AQI
39AQI
37AQI
46AQI
40AQI
38AQI
33AQI
31AQI
22AQI
24AQI
22AQI
20AQI
22AQI
31AQI
29AQI
34AQI
38AQI
38AQI
44AQI
41AQI
44AQI
52AQI
68AQI
76AQI
77AQI
73AQI
56AQI
49AQI
51AQI
48AQI
41AQI
40AQI
39AQI
41AQI
39AQI
33AQI
32AQI
34AQI
34AQI
37AQI
37AQI
33AQI
32AQI
30AQI
36AQI
32AQI
31AQI
30AQI
33AQI
41AQI
45AQI
62AQI
50AQI
51AQI
49AQI
47AQI
47AQI
38AQI
39AQI
36AQI
33AQI
34AQI
35AQI
36AQI
39AQI
43AQI
44AQI
47AQI
49AQI
49AQI
48AQI
55AQI
55AQI
53AQI
50AQI
46AQI
51AQI
55AQI
53AQI
42AQI
37AQI
37AQI
32AQI
29AQI
29AQI
29AQI
38AQI
41AQI
36AQI
31AQI
31AQI
28AQI
36AQI
36AQI
35AQI
48AQI
46AQI
34AQI
34AQI
29AQI
28AQI
27AQI
27AQI
32AQI
47AQI
32AQI
30AQI
48AQI
39AQI
46AQI
53AQI
57AQI
61AQI
58AQI
37AQI
35AQI
41AQI
36AQI
31AQI
33AQI
43AQI
46AQI
35AQI
55AQI
No. of days
202538AQI
Highest AQI recorded in
October55AQI
Lowest AQI recorded in
May31AQI
202438AQI
Highest AQI recorded in
July48AQI
Lowest AQI recorded in
August31AQI
202337AQI
Highest AQI recorded in
December38AQI
Lowest AQI recorded in
November25AQI
202241AQI
Highest AQI recorded in
January41AQI
Lowest AQI recorded in
January41AQI
202140AQI
Highest AQI recorded in
December49AQI
Lowest AQI recorded in
April32AQI
202040AQI
Highest AQI recorded in
August48AQI
Lowest AQI recorded in
September33AQI
Most & Least Polluted Years Over the Last 6 Years
Hanamigawa's annual 2025 AQI (38) shows an average percentage change of -2.7% (improved AQI) compared to previous years: 2020 (40), 2021 (40), 2022 (41), 2023 (37), 2024 (38).