Gwacheon, 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
Gwacheon, Gyeonggi, South Korea
AQI Trends: Highest and Lowest
Same Day Analysis (23rd September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 27 of Good air quality, showing improvement over 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 23rd Sep - 24th Sep 2025
Gwacheon, Gyeonggi, South Korea
6 AM23rd Sep 2025
6 PM
5 AM24th Sep 2025
28AQI
17AQI
30AQI
21AQI
In the last 24 hours,
Gwacheon's AQI reached its highest point of 30 at 1 AM during the Night, while the lowest point, 17, was recorded at 5 PM during the Day between 23rd Sep and 24th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Gwacheon, Gyeonggi, South Korea
29°C26/34°C
27°C24/31°C
27°C23/33°C
27°C24/32°C
27°C25/32°C
28°C24/32°C
28°C24/33°C
25°C23/28°C
26°C22/31°C
27°C22/32°C
24°C22/29°C
27°C22/33°C
27°C24/32°C
26°C23/29°C
25°C21/31°C
25°C22/28°C
25°C19/31°C
26°C20/32°C
24°C21/29°C
22°C20/26°C
24°C20/29°C
26°C21/31°C
24°C22/28°C
22°C19/24°C
21°C19/24°C
19°C17/22°C
18°C17/21°C
21°C16/26°C
21°C17/25°C
22°C19/27°C
--°C/°C
45AQI
38AQI
46AQI
38AQI
2025 Days Vs Air Quality
Gwacheon, Gyeonggi, South Korea
30%
80
64%
170
6%
15
0.3%
1
Total number of days with different AQI categories in last 267 days in 2025 (98 days remaining)
Under WHO’s Safe Air Quality Limits: 30%
Health Risk Level:
High
In 2025, 30% of 267 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
Gwacheon, Gyeonggi, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
77AQI
59AQI
61AQI
62AQI
72AQI
100AQI
59AQI
74AQI
45AQI
61AQI
62AQI
79AQI
95AQI
103AQI
59AQI
79AQI
88AQI
83AQI
89AQI
134AQI
139AQI
151AQI
116AQI
110AQI
67AQI
60AQI
67AQI
62AQI
62AQI
55AQI
77AQI
84AQI
82AQI
59AQI
58AQI
51AQI
58AQI
54AQI
53AQI
54AQI
61AQI
80AQI
80AQI
56AQI
98AQI
60AQI
115AQI
52AQI
66AQI
49AQI
57AQI
56AQI
62AQI
56AQI
61AQI
57AQI
72AQI
60AQI
82AQI
107AQI
79AQI
59AQI
46AQI
38AQI
75AQI
98AQI
88AQI
108AQI
121AQI
111AQI
100AQI
95AQI
79AQI
60AQI
74AQI
67AQI
73AQI
81AQI
92AQI
106AQI
114AQI
118AQI
122AQI
129AQI
94AQI
92AQI
62AQI
55AQI
49AQI
62AQI
82AQI
84AQI
80AQI
81AQI
65AQI
68AQI
75AQI
78AQI
74AQI
80AQI
90AQI
67AQI
64AQI
49AQI
60AQI
65AQI
71AQI
87AQI
52AQI
63AQI
54AQI
45AQI
41AQI
67AQI
64AQI
57AQI
46AQI
61AQI
68AQI
60AQI
61AQI
53AQI
51AQI
50AQI
53AQI
43AQI
56AQI
64AQI
53AQI
58AQI
74AQI
75AQI
76AQI
74AQI
71AQI
60AQI
49AQI
59AQI
62AQI
44AQI
49AQI
50AQI
64AQI
47AQI
52AQI
66AQI
79AQI
86AQI
79AQI
78AQI
85AQI
90AQI
96AQI
75AQI
57AQI
58AQI
58AQI
69AQI
55AQI
65AQI
50AQI
54AQI
63AQI
71AQI
59AQI
55AQI
67AQI
66AQI
68AQI
65AQI
46AQI
57AQI
67AQI
70AQI
59AQI
48AQI
54AQI
62AQI
63AQI
50AQI
46AQI
41AQI
40AQI
50AQI
49AQI
46AQI
51AQI
68AQI
64AQI
56AQI
48AQI
47AQI
46AQI
60AQI
49AQI
41AQI
48AQI
37AQI
39AQI
32AQI
35AQI
35AQI
34AQI
39AQI
48AQI
56AQI
45AQI
44AQI
63AQI
68AQI
59AQI
59AQI
59AQI
61AQI
61AQI
51AQI
51AQI
46AQI
47AQI
55AQI
54AQI
50AQI
57AQI
51AQI
42AQI
43AQI
40AQI
38AQI
41AQI
51AQI
45AQI
47AQI
48AQI
48AQI
49AQI
52AQI
49AQI
44AQI
51AQI
52AQI
46AQI
44AQI
50AQI
41AQI
49AQI
51AQI
37AQI
37AQI
40AQI
43AQI
49AQI
53AQI
50AQI
51AQI
49AQI
40AQI
43AQI
46AQI
42AQI
36AQI
29AQI
31AQI
26AQI
24AQI
26AQI
27AQI
81AQI
65AQI
86AQI
67AQI
62AQI
62AQI
48AQI
49AQI
40AQI
No. of days
202563AQI
Highest AQI recorded in
March86AQI
Lowest AQI recorded in
September40AQI
202461AQI
Highest AQI recorded in
January77AQI
Lowest AQI recorded in
September39AQI
202366AQI
Highest AQI recorded in
February90AQI
Lowest AQI recorded in
September46AQI
202265AQI
Highest AQI recorded in
February84AQI
Lowest AQI recorded in
August45AQI
202165AQI
Highest AQI recorded in
March94AQI
Lowest AQI recorded in
September34AQI
202061AQI
Highest AQI recorded in
December79AQI
Lowest AQI recorded in
September42AQI
Most & Least Polluted Years Over the Last 6 Years
Gwacheon's annual 2025 AQI (63) shows an average percentage change of -0.9% (improved AQI) compared to previous years: 2020 (61), 2021 (65), 2022 (65), 2023 (66), 2024 (61).