Narashino, Chiba, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Narashino, Chiba, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (15th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 35 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 16th Aug - 17th Aug 2025
Narashino, Chiba, Japan
4 AM16th Aug 2025
6 PM
3 AM17th Aug 2025
AQI
AQI
48AQI
30AQI
In the last 24 hours,
Narashino's AQI reached its highest point of 48 at 1 PM during the Night, while the lowest point, 30, was recorded at 9 AM during the Night between 16th Aug and 17th Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Narashino, Chiba, Japan
27°C25/29°C
27°C25/30°C
28°C26/30°C
28°C26/32°C
28°C26/32°C
28°C26/32°C
29°C26/33°C
29°C26/32°C
29°C27/32°C
28°C27/31°C
29°C26/34°C
30°C25/36°C
29°C25/34°C
28°C24/32°C
28°C25/31°C
29°C26/33°C
30°C27/35°C
29°C28/33°C
30°C28/34°C
31°C28/35°C
30°C28/33°C
29°C24/33°C
28°C25/32°C
27°C25/28°C
27°C27/29°C
28°C26/30°C
27°C25/31°C
27°C24/32°C
28°C26/31°C
--°C/°C
--°C/°C
40AQI
35AQI
39AQI
35AQI
2025 Days Vs Air Quality
Narashino, Chiba, Japan
89%
203
11%
24
Total number of days with different AQI categories in last 228 days in 2025 (137 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 228 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
Narashino, Chiba, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
32AQI
31AQI
25AQI
29AQI
36AQI
51AQI
31AQI
34AQI
29AQI
29AQI
29AQI
33AQI
30AQI
44AQI
42AQI
38AQI
34AQI
34AQI
55AQI
40AQI
42AQI
39AQI
54AQI
46AQI
41AQI
37AQI
36AQI
40AQI
31AQI
32AQI
29AQI
35AQI
32AQI
38AQI
32AQI
32AQI
29AQI
30AQI
30AQI
29AQI
28AQI
31AQI
32AQI
37AQI
29AQI
34AQI
38AQI
36AQI
32AQI
31AQI
30AQI
30AQI
31AQI
32AQI
33AQI
34AQI
36AQI
39AQI
55AQI
49AQI
62AQI
41AQI
40AQI
26AQI
33AQI
31AQI
32AQI
33AQI
34AQI
41AQI
44AQI
42AQI
40AQI
34AQI
25AQI
21AQI
23AQI
18AQI
22AQI
43AQI
49AQI
57AQI
53AQI
66AQI
79AQI
71AQI
49AQI
39AQI
40AQI
32AQI
28AQI
22AQI
20AQI
20AQI
22AQI
26AQI
29AQI
38AQI
26AQI
46AQI
40AQI
38AQI
28AQI
38AQI
30AQI
32AQI
46AQI
52AQI
61AQI
51AQI
43AQI
44AQI
30AQI
38AQI
36AQI
44AQI
48AQI
42AQI
36AQI
44AQI
39AQI
28AQI
31AQI
37AQI
36AQI
28AQI
25AQI
26AQI
29AQI
24AQI
29AQI
27AQI
36AQI
36AQI
39AQI
42AQI
30AQI
46AQI
42AQI
62AQI
43AQI
40AQI
39AQI
36AQI
30AQI
27AQI
24AQI
23AQI
25AQI
24AQI
16AQI
21AQI
28AQI
30AQI
30AQI
39AQI
45AQI
49AQI
55AQI
42AQI
32AQI
26AQI
34AQI
33AQI
32AQI
39AQI
42AQI
49AQI
45AQI
42AQI
36AQI
32AQI
22AQI
24AQI
23AQI
20AQI
22AQI
29AQI
28AQI
33AQI
36AQI
37AQI
39AQI
39AQI
41AQI
49AQI
63AQI
72AQI
75AQI
70AQI
55AQI
50AQI
52AQI
50AQI
43AQI
42AQI
41AQI
43AQI
39AQI
33AQI
33AQI
34AQI
32AQI
34AQI
34AQI
30AQI
31AQI
28AQI
34AQI
31AQI
30AQI
29AQI
32AQI
41AQI
44AQI
61AQI
51AQI
51AQI
50AQI
47AQI
50AQI
40AQI
40AQI
35AQI
33AQI
37AQI
35AQI
37AQI
33AQI
41AQI
37AQI
33AQI
34AQI
42AQI
43AQI
No. of days
202537AQI
Highest AQI recorded in
August43AQI
Lowest AQI recorded in
May33AQI
202438AQI
Highest AQI recorded in
July53AQI
Lowest AQI recorded in
September30AQI
202341AQI
Highest AQI recorded in
April47AQI
Lowest AQI recorded in
August34AQI
202241AQI
Highest AQI recorded in
April45AQI
Lowest AQI recorded in
August32AQI
202136AQI
Highest AQI recorded in
December43AQI
Lowest AQI recorded in
March32AQI
202035AQI
Highest AQI recorded in
August44AQI
Lowest AQI recorded in
September26AQI
Most & Least Polluted Years Over the Last 6 Years
Narashino's annual 2025 AQI (37) shows an average percentage change of -2.5% (improved AQI) compared to previous years: 2020 (35), 2021 (36), 2022 (41), 2023 (41), 2024 (38).