Asan, Chungnam, South Korea 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
Asan, Chungnam, South Korea
AQI Trends: Highest and Lowest
Same Day Analysis (24th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 30 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 25th Sep - 26th Sep 2025
Asan, Chungnam, South Korea
6 AM25th Sep 2025
6 PM
5 AM26th Sep 2025
30AQI
20AQI
44AQI
23AQI
In the last 24 hours,
Asan's AQI reached its highest point of 44 at 4 AM during the Night, while the lowest point, 20, was recorded at 9 AM during the Day between 25th Sep and 26th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Asan, Chungnam, South Korea
25°C20/31°C
25°C20/31°C
26°C23/31°C
27°C23/32°C
27°C23/33°C
25°C22/30°C
24°C21/30°C
24°C19/32°C
22°C22/24°C
25°C21/32°C
26°C23/31°C
24°C19/29°C
22°C18/28°C
21°C17/23°C
22°C18/28°C
23°C18/29°C
22°C20/24°C
24°C20/27°C
23°C19/28°C
24°C20/30°C
25°C21/29°C
22°C19/25°C
20°C17/26°C
18°C15/20°C
18°C15/22°C
19°C15/25°C
20°C17/25°C
20°C17/24°C
21°C16/25°C
21°C20/22°C
--°C/°C
44AQI
38AQI
44AQI
37AQI
2025 Days Vs Air Quality
Asan, Chungnam, South Korea
38%
101
58%
156
4%
10
Total number of days with different AQI categories in last 269 days in 2025 (96 days remaining)
Under WHO’s Safe Air Quality Limits: 38%
Health Risk Level:
High
In 2025, 38% of 269 days were within WHO’s safe air quality limits. The risk of health issues is High, with respiratory problems, heart disease, skin issues, and stress being more common, particularly among children and the elderly.
Annual Air Quality Insights
Asan, Chungnam, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
71AQI
61AQI
58AQI
57AQI
69AQI
77AQI
56AQI
64AQI
41AQI
60AQI
62AQI
76AQI
88AQI
88AQI
58AQI
68AQI
78AQI
77AQI
83AQI
110AQI
132AQI
134AQI
110AQI
109AQI
79AQI
58AQI
67AQI
51AQI
57AQI
61AQI
77AQI
90AQI
95AQI
60AQI
52AQI
48AQI
53AQI
48AQI
44AQI
52AQI
58AQI
73AQI
69AQI
51AQI
77AQI
56AQI
106AQI
52AQI
62AQI
47AQI
54AQI
51AQI
58AQI
52AQI
52AQI
54AQI
71AQI
61AQI
69AQI
93AQI
68AQI
55AQI
45AQI
41AQI
67AQI
78AQI
77AQI
95AQI
90AQI
95AQI
91AQI
81AQI
82AQI
49AQI
69AQI
61AQI
78AQI
80AQI
95AQI
97AQI
108AQI
112AQI
109AQI
129AQI
88AQI
88AQI
62AQI
52AQI
51AQI
62AQI
72AQI
79AQI
80AQI
80AQI
70AQI
66AQI
69AQI
74AQI
66AQI
73AQI
79AQI
62AQI
61AQI
45AQI
56AQI
62AQI
64AQI
78AQI
50AQI
64AQI
50AQI
46AQI
42AQI
58AQI
58AQI
48AQI
41AQI
53AQI
62AQI
59AQI
54AQI
50AQI
49AQI
47AQI
48AQI
47AQI
50AQI
62AQI
45AQI
53AQI
66AQI
69AQI
72AQI
72AQI
51AQI
47AQI
45AQI
58AQI
57AQI
39AQI
45AQI
49AQI
57AQI
49AQI
47AQI
60AQI
69AQI
71AQI
75AQI
75AQI
80AQI
82AQI
91AQI
74AQI
60AQI
56AQI
60AQI
66AQI
60AQI
61AQI
57AQI
53AQI
57AQI
65AQI
46AQI
55AQI
61AQI
62AQI
63AQI
62AQI
47AQI
43AQI
37AQI
48AQI
49AQI
40AQI
49AQI
58AQI
57AQI
46AQI
45AQI
44AQI
44AQI
52AQI
50AQI
49AQI
50AQI
57AQI
64AQI
53AQI
51AQI
53AQI
51AQI
60AQI
56AQI
45AQI
53AQI
42AQI
46AQI
36AQI
44AQI
40AQI
36AQI
45AQI
53AQI
56AQI
49AQI
43AQI
55AQI
59AQI
55AQI
53AQI
57AQI
61AQI
61AQI
51AQI
50AQI
47AQI
49AQI
52AQI
54AQI
50AQI
55AQI
46AQI
40AQI
40AQI
39AQI
38AQI
40AQI
50AQI
43AQI
45AQI
44AQI
45AQI
47AQI
50AQI
47AQI
43AQI
48AQI
52AQI
47AQI
45AQI
50AQI
42AQI
47AQI
50AQI
45AQI
41AQI
41AQI
40AQI
47AQI
48AQI
50AQI
49AQI
45AQI
40AQI
43AQI
46AQI
44AQI
36AQI
40AQI
33AQI
29AQI
29AQI
27AQI
27AQI
30AQI
75AQI
61AQI
79AQI
62AQI
57AQI
57AQI
50AQI
48AQI
40AQI
No. of days
202559AQI
Highest AQI recorded in
March79AQI
Lowest AQI recorded in
September40AQI
202457AQI
Highest AQI recorded in
February73AQI
Lowest AQI recorded in
July36AQI
202368AQI
Highest AQI recorded in
February100AQI
Lowest AQI recorded in
September48AQI
202267AQI
Highest AQI recorded in
February86AQI
Lowest AQI recorded in
August43AQI
202169AQI
Highest AQI recorded in
March98AQI
Lowest AQI recorded in
September38AQI
202064AQI
Highest AQI recorded in
December82AQI
Lowest AQI recorded in
July46AQI
Most & Least Polluted Years Over the Last 6 Years
Asan's annual 2025 AQI (59) shows an average percentage change of -8.3% (improved AQI) compared to previous years: 2020 (64), 2021 (69), 2022 (67), 2023 (68), 2024 (57).