Hosan, 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
Hosan, Chungnam, South Korea
AQI Trends: Highest and Lowest
Same Day Analysis (29th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 43 of Good air quality, showing improvement over 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 30th Sep - 1st Oct 2025
Hosan, Chungnam, South Korea
6 AM30th Sep 2025
6 PM
5 AM1st Oct 2025
AQI
AQI
61AQI
25AQI
In the last 24 hours,
Hosan's AQI reached its highest point of 61 at 11 AM during the Night, while the lowest point, 25, was recorded at 7 AM during the Night between 30th Sep and 1st Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Hosan, Chungnam, South Korea
26°C23/32°C
24°C21/29°C
25°C19/32°C
23°C22/25°C
26°C22/32°C
26°C23/31°C
25°C21/29°C
22°C19/28°C
20°C19/22°C
23°C19/28°C
23°C18/29°C
22°C21/25°C
24°C21/28°C
24°C21/28°C
24°C20/29°C
24°C21/30°C
23°C20/26°C
21°C18/25°C
19°C18/22°C
19°C17/24°C
20°C16/26°C
20°C17/26°C
20°C18/25°C
22°C17/28°C
22°C21/23°C
22°C17/27°C
22°C18/26°C
20°C18/21°C
20°C16/24°C
--°C/°C
--°C/°C
43AQI
39AQI
43AQI
37AQI
2025 Days Vs Air Quality
Hosan, Chungnam, South Korea
38%
102
59%
160
4%
10
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 38%
Health Risk Level:
High
In 2025, 38% of 273 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
Hosan, Chungnam, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
70AQI
64AQI
57AQI
61AQI
61AQI
75AQI
57AQI
65AQI
42AQI
58AQI
62AQI
72AQI
83AQI
87AQI
61AQI
66AQI
81AQI
83AQI
90AQI
110AQI
136AQI
140AQI
118AQI
112AQI
77AQI
61AQI
63AQI
46AQI
50AQI
59AQI
75AQI
82AQI
91AQI
58AQI
51AQI
49AQI
50AQI
48AQI
43AQI
51AQI
60AQI
66AQI
62AQI
48AQI
71AQI
55AQI
102AQI
50AQI
58AQI
46AQI
51AQI
49AQI
57AQI
50AQI
51AQI
53AQI
68AQI
65AQI
67AQI
88AQI
70AQI
52AQI
45AQI
37AQI
64AQI
76AQI
77AQI
88AQI
87AQI
90AQI
88AQI
78AQI
76AQI
47AQI
66AQI
62AQI
73AQI
82AQI
92AQI
98AQI
107AQI
115AQI
107AQI
127AQI
89AQI
84AQI
62AQI
50AQI
51AQI
63AQI
72AQI
80AQI
81AQI
81AQI
69AQI
66AQI
67AQI
73AQI
68AQI
76AQI
84AQI
63AQI
60AQI
42AQI
55AQI
60AQI
66AQI
77AQI
51AQI
65AQI
54AQI
44AQI
48AQI
60AQI
62AQI
51AQI
44AQI
55AQI
64AQI
60AQI
55AQI
51AQI
49AQI
48AQI
49AQI
48AQI
51AQI
62AQI
44AQI
52AQI
65AQI
68AQI
73AQI
73AQI
55AQI
48AQI
49AQI
59AQI
58AQI
43AQI
46AQI
51AQI
58AQI
49AQI
46AQI
64AQI
73AQI
76AQI
79AQI
80AQI
85AQI
87AQI
93AQI
79AQI
64AQI
58AQI
63AQI
68AQI
63AQI
62AQI
58AQI
57AQI
59AQI
67AQI
48AQI
59AQI
63AQI
63AQI
64AQI
63AQI
49AQI
44AQI
34AQI
49AQI
50AQI
43AQI
56AQI
61AQI
60AQI
49AQI
48AQI
46AQI
48AQI
55AQI
52AQI
48AQI
50AQI
58AQI
64AQI
52AQI
51AQI
53AQI
52AQI
62AQI
56AQI
44AQI
53AQI
44AQI
46AQI
37AQI
46AQI
41AQI
39AQI
48AQI
54AQI
56AQI
47AQI
42AQI
55AQI
59AQI
53AQI
55AQI
56AQI
62AQI
62AQI
53AQI
52AQI
50AQI
50AQI
53AQI
56AQI
50AQI
55AQI
46AQI
42AQI
42AQI
39AQI
40AQI
42AQI
51AQI
47AQI
47AQI
48AQI
48AQI
48AQI
51AQI
47AQI
43AQI
49AQI
53AQI
46AQI
44AQI
49AQI
40AQI
46AQI
49AQI
42AQI
43AQI
41AQI
40AQI
47AQI
46AQI
47AQI
46AQI
41AQI
37AQI
41AQI
44AQI
43AQI
38AQI
39AQI
35AQI
30AQI
30AQI
28AQI
29AQI
33AQI
24AQI
48AQI
60AQI
32AQI
43AQI
76AQI
59AQI
77AQI
63AQI
58AQI
59AQI
51AQI
49AQI
40AQI
No. of days
202559AQI
Highest AQI recorded in
March77AQI
Lowest AQI recorded in
September40AQI
202460AQI
Highest AQI recorded in
January76AQI
Lowest AQI recorded in
July40AQI
202367AQI
Highest AQI recorded in
February91AQI
Lowest AQI recorded in
July47AQI
202268AQI
Highest AQI recorded in
February87AQI
Lowest AQI recorded in
August44AQI
202168AQI
Highest AQI recorded in
March94AQI
Lowest AQI recorded in
September41AQI
202061AQI
Highest AQI recorded in
December83AQI
Lowest AQI recorded in
July43AQI
Most & Least Polluted Years Over the Last 6 Years
Hosan's annual 2025 AQI (59) shows an average percentage change of -8.2% (improved AQI) compared to previous years: 2020 (61), 2021 (68), 2022 (68), 2023 (67), 2024 (60).