Seochang, Bucheon, Gyeonggi, 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
Seochang, Bucheon, Gyeonggi, 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 52 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Sep - 18th Sep 2025
Seochang, Bucheon, Gyeonggi, South Korea
6 AM17th Sep 2025
7 PM
5 AM18th Sep 2025
AQI
AQI
55AQI
18AQI
In the last 24 hours,
Seochang's AQI reached its highest point of 55 at 6 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
Seochang, Bucheon, Gyeonggi, South Korea
28°C25/31°C
28°C25/31°C
28°C26/32°C
28°C26/31°C
28°C26/32°C
29°C26/32°C
29°C27/32°C
27°C25/29°C
27°C24/31°C
27°C25/31°C
27°C25/30°C
28°C25/31°C
28°C25/31°C
26°C24/29°C
26°C23/29°C
27°C24/32°C
25°C23/29°C
27°C24/32°C
27°C25/31°C
26°C24/29°C
25°C23/29°C
25°C23/28°C
26°C21/31°C
27°C22/32°C
25°C21/29°C
23°C21/27°C
24°C22/27°C
26°C22/30°C
25°C24/28°C
--°C/°C
--°C/°C
49AQI
44AQI
49AQI
47AQI
2025 Days Vs Air Quality
Seochang, Bucheon, Gyeonggi, South Korea
21%
55
71%
184
8%
20
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 21%
Health Risk Level:
Very high
In 2025, 21% of 260 days were within WHO’s safe air quality limits. The risk of health issues is Very high, including respiratory issues, heart disease, and stress, particularly affecting vulnerable groups.
Annual Air Quality Insights
Seochang, Bucheon, Gyeonggi, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
76AQI
59AQI
60AQI
62AQI
69AQI
97AQI
58AQI
74AQI
43AQI
58AQI
61AQI
81AQI
91AQI
102AQI
57AQI
81AQI
78AQI
82AQI
79AQI
131AQI
128AQI
150AQI
111AQI
114AQI
69AQI
60AQI
68AQI
62AQI
63AQI
51AQI
73AQI
84AQI
87AQI
57AQI
56AQI
47AQI
56AQI
48AQI
46AQI
50AQI
60AQI
75AQI
79AQI
56AQI
93AQI
61AQI
112AQI
52AQI
65AQI
48AQI
58AQI
56AQI
59AQI
57AQI
60AQI
56AQI
70AQI
64AQI
80AQI
107AQI
86AQI
59AQI
49AQI
38AQI
79AQI
99AQI
93AQI
109AQI
125AQI
122AQI
106AQI
102AQI
80AQI
64AQI
78AQI
70AQI
82AQI
85AQI
96AQI
108AQI
117AQI
124AQI
120AQI
132AQI
96AQI
97AQI
63AQI
52AQI
48AQI
64AQI
77AQI
86AQI
89AQI
89AQI
70AQI
68AQI
75AQI
78AQI
80AQI
84AQI
98AQI
75AQI
66AQI
51AQI
61AQI
66AQI
73AQI
80AQI
50AQI
67AQI
58AQI
49AQI
39AQI
70AQI
65AQI
60AQI
48AQI
63AQI
77AQI
64AQI
67AQI
55AQI
51AQI
49AQI
55AQI
46AQI
56AQI
63AQI
55AQI
62AQI
76AQI
76AQI
79AQI
75AQI
69AQI
59AQI
52AQI
58AQI
62AQI
39AQI
49AQI
54AQI
70AQI
52AQI
53AQI
72AQI
85AQI
101AQI
92AQI
103AQI
96AQI
92AQI
96AQI
77AQI
61AQI
61AQI
59AQI
69AQI
57AQI
64AQI
52AQI
59AQI
66AQI
78AQI
69AQI
60AQI
69AQI
70AQI
71AQI
69AQI
56AQI
63AQI
72AQI
76AQI
68AQI
58AQI
60AQI
67AQI
67AQI
55AQI
51AQI
48AQI
49AQI
55AQI
55AQI
52AQI
55AQI
67AQI
68AQI
61AQI
56AQI
53AQI
51AQI
62AQI
57AQI
48AQI
55AQI
44AQI
48AQI
38AQI
46AQI
46AQI
45AQI
49AQI
54AQI
67AQI
61AQI
53AQI
71AQI
71AQI
78AQI
68AQI
59AQI
62AQI
62AQI
52AQI
53AQI
48AQI
50AQI
58AQI
61AQI
55AQI
60AQI
53AQI
47AQI
44AQI
42AQI
39AQI
39AQI
50AQI
46AQI
48AQI
49AQI
50AQI
50AQI
51AQI
49AQI
42AQI
50AQI
53AQI
46AQI
43AQI
48AQI
40AQI
47AQI
52AQI
43AQI
42AQI
39AQI
44AQI
50AQI
52AQI
51AQI
53AQI
51AQI
42AQI
44AQI
52AQI
52AQI
79AQI
64AQI
89AQI
69AQI
66AQI
66AQI
56AQI
50AQI
47AQI
No. of days
202566AQI
Highest AQI recorded in
March89AQI
Lowest AQI recorded in
September47AQI
202466AQI
Highest AQI recorded in
January82AQI
Lowest AQI recorded in
September45AQI
202370AQI
Highest AQI recorded in
February95AQI
Lowest AQI recorded in
September52AQI
202267AQI
Highest AQI recorded in
November77AQI
Lowest AQI recorded in
August36AQI
202156AQI
Highest AQI recorded in
April69AQI
Lowest AQI recorded in
September33AQI
Most & Least Polluted Years Over the Last 5 Years
Seochang's annual 2025 AQI (66) shows an average percentage change of 2.7% (worsened AQI) compared to previous years: 2021 (56), 2022 (67), 2023 (70), 2024 (66).