Hongseong, 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
Hongseong, Chungnam, South Korea
AQI Trends: Highest and Lowest
Same Day Analysis (16th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 45 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Hongseong, Chungnam, South Korea
6 AM17th Sep 2025
7 PM
5 AM18th Sep 2025
AQI
AQI
50AQI
21AQI
In the last 24 hours,
Hongseong's AQI reached its highest point of 50 at 7 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 17th Sep and 18th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Hongseong, Chungnam, South Korea
26°C23/31°C
26°C23/32°C
27°C23/33°C
27°C23/32°C
27°C23/33°C
27°C23/33°C
27°C23/32°C
26°C21/30°C
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
--°C/°C
--°C/°C
49AQI
43AQI
49AQI
47AQI
2025 Days Vs Air Quality
Hongseong, Chungnam, South Korea
30%
78
64%
165
6%
16
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 30%
Health Risk Level:
High
In 2025, 30% of 260 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
Hongseong, Chungnam, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
72AQI
60AQI
58AQI
58AQI
66AQI
78AQI
54AQI
60AQI
39AQI
59AQI
62AQI
78AQI
84AQI
90AQI
53AQI
66AQI
73AQI
73AQI
75AQI
115AQI
125AQI
132AQI
110AQI
118AQI
85AQI
63AQI
64AQI
51AQI
52AQI
57AQI
77AQI
101AQI
101AQI
58AQI
51AQI
44AQI
52AQI
45AQI
41AQI
50AQI
56AQI
76AQI
66AQI
51AQI
75AQI
57AQI
106AQI
50AQI
58AQI
45AQI
51AQI
51AQI
56AQI
51AQI
50AQI
51AQI
74AQI
58AQI
76AQI
106AQI
82AQI
56AQI
47AQI
41AQI
75AQI
82AQI
84AQI
110AQI
105AQI
103AQI
96AQI
86AQI
84AQI
59AQI
72AQI
63AQI
80AQI
80AQI
95AQI
98AQI
111AQI
117AQI
114AQI
129AQI
93AQI
91AQI
57AQI
49AQI
48AQI
63AQI
74AQI
79AQI
86AQI
81AQI
76AQI
66AQI
73AQI
75AQI
67AQI
74AQI
83AQI
65AQI
63AQI
45AQI
60AQI
62AQI
71AQI
83AQI
49AQI
71AQI
58AQI
48AQI
44AQI
65AQI
58AQI
50AQI
40AQI
58AQI
63AQI
57AQI
57AQI
51AQI
53AQI
47AQI
51AQI
48AQI
52AQI
60AQI
50AQI
60AQI
70AQI
69AQI
74AQI
71AQI
57AQI
50AQI
41AQI
58AQI
58AQI
38AQI
50AQI
52AQI
58AQI
54AQI
49AQI
64AQI
70AQI
74AQI
79AQI
82AQI
87AQI
85AQI
97AQI
74AQI
61AQI
55AQI
59AQI
68AQI
61AQI
64AQI
55AQI
54AQI
59AQI
66AQI
55AQI
59AQI
62AQI
62AQI
63AQI
64AQI
50AQI
48AQI
47AQI
55AQI
57AQI
46AQI
49AQI
61AQI
56AQI
48AQI
47AQI
45AQI
49AQI
53AQI
50AQI
49AQI
50AQI
59AQI
63AQI
54AQI
53AQI
54AQI
53AQI
62AQI
59AQI
47AQI
53AQI
44AQI
47AQI
40AQI
46AQI
44AQI
41AQI
48AQI
54AQI
63AQI
58AQI
50AQI
57AQI
62AQI
63AQI
58AQI
58AQI
61AQI
61AQI
53AQI
51AQI
50AQI
49AQI
53AQI
55AQI
55AQI
57AQI
50AQI
41AQI
41AQI
40AQI
38AQI
42AQI
51AQI
45AQI
46AQI
48AQI
47AQI
49AQI
52AQI
48AQI
43AQI
50AQI
52AQI
46AQI
45AQI
48AQI
41AQI
48AQI
51AQI
48AQI
45AQI
40AQI
41AQI
48AQI
51AQI
51AQI
52AQI
48AQI
43AQI
44AQI
48AQI
45AQI
74AQI
61AQI
83AQI
65AQI
59AQI
60AQI
53AQI
49AQI
47AQI
No. of days
202562AQI
Highest AQI recorded in
March83AQI
Lowest AQI recorded in
September47AQI
202465AQI
Highest AQI recorded in
January82AQI
Lowest AQI recorded in
July43AQI
202367AQI
Highest AQI recorded in
February91AQI
Lowest AQI recorded in
September52AQI
202269AQI
Highest AQI recorded in
February86AQI
Lowest AQI recorded in
August42AQI
202170AQI
Highest AQI recorded in
March110AQI
Lowest AQI recorded in
September41AQI
202065AQI
Highest AQI recorded in
December85AQI
Lowest AQI recorded in
September48AQI
Most & Least Polluted Years Over the Last 6 Years
Hongseong's annual 2025 AQI (62) shows an average percentage change of -7.7% (improved AQI) compared to previous years: 2020 (65), 2021 (70), 2022 (69), 2023 (67), 2024 (65).