Janghyeon Dong, Ansan, 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
Janghyeon Dong, Ansan, Gyeonggi, South Korea
AQI Trends: Highest and Lowest
Same Day Analysis (30th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 49 of Good air quality, showing improvement over 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 30th Sep - 1st Oct 2025
Janghyeon Dong, Ansan, Gyeonggi, South Korea
6 AM30th Sep 2025
6 PM
5 AM1st Oct 2025
AQI
AQI
79AQI
32AQI
In the last 24 hours,
Janghyeon Dong's AQI reached its highest point of 79 at 4 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 30th Sep and 1st Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Janghyeon Dong, Ansan, Gyeonggi, South Korea
26°C23/30°C
25°C22/29°C
27°C23/31°C
25°C23/27°C
27°C23/32°C
27°C24/32°C
25°C23/28°C
25°C22/28°C
25°C22/28°C
26°C22/30°C
26°C23/31°C
25°C20/29°C
23°C20/26°C
25°C22/28°C
26°C23/31°C
25°C23/29°C
23°C19/26°C
21°C19/24°C
18°C16/20°C
18°C16/20°C
22°C18/26°C
22°C20/26°C
23°C21/27°C
21°C20/23°C
22°C20/25°C
22°C18/26°C
23°C21/28°C
19°C18/20°C
19°C17/22°C
--°C/°C
--°C/°C
44AQI
39AQI
46AQI
39AQI
2025 Days Vs Air Quality
Janghyeon Dong, Ansan, Gyeonggi, South Korea
33%
90
62%
169
5%
14
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 33%
Health Risk Level:
High
In 2025, 33% 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
Janghyeon Dong, Ansan, Gyeonggi, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
69AQI
51AQI
54AQI
56AQI
63AQI
93AQI
49AQI
63AQI
39AQI
46AQI
49AQI
69AQI
81AQI
93AQI
50AQI
70AQI
71AQI
73AQI
74AQI
127AQI
126AQI
146AQI
102AQI
106AQI
63AQI
54AQI
64AQI
54AQI
53AQI
43AQI
68AQI
77AQI
79AQI
51AQI
46AQI
37AQI
49AQI
39AQI
36AQI
39AQI
49AQI
64AQI
72AQI
50AQI
87AQI
57AQI
109AQI
47AQI
56AQI
42AQI
48AQI
47AQI
51AQI
46AQI
50AQI
49AQI
66AQI
57AQI
78AQI
95AQI
78AQI
56AQI
46AQI
35AQI
71AQI
90AQI
84AQI
101AQI
112AQI
106AQI
101AQI
96AQI
76AQI
57AQI
70AQI
62AQI
71AQI
76AQI
87AQI
99AQI
106AQI
109AQI
111AQI
127AQI
95AQI
94AQI
56AQI
45AQI
37AQI
58AQI
71AQI
78AQI
81AQI
77AQI
67AQI
64AQI
73AQI
76AQI
73AQI
80AQI
90AQI
66AQI
61AQI
42AQI
56AQI
62AQI
70AQI
85AQI
52AQI
68AQI
55AQI
49AQI
36AQI
65AQI
57AQI
55AQI
40AQI
59AQI
66AQI
58AQI
61AQI
50AQI
49AQI
48AQI
53AQI
40AQI
55AQI
60AQI
51AQI
64AQI
75AQI
76AQI
75AQI
73AQI
69AQI
62AQI
56AQI
56AQI
62AQI
41AQI
54AQI
55AQI
66AQI
49AQI
48AQI
70AQI
85AQI
94AQI
83AQI
91AQI
91AQI
89AQI
98AQI
78AQI
61AQI
60AQI
59AQI
69AQI
57AQI
63AQI
53AQI
57AQI
69AQI
79AQI
68AQI
60AQI
72AQI
70AQI
71AQI
68AQI
49AQI
63AQI
71AQI
79AQI
66AQI
55AQI
60AQI
72AQI
67AQI
53AQI
49AQI
46AQI
49AQI
55AQI
54AQI
53AQI
55AQI
73AQI
76AQI
63AQI
58AQI
52AQI
51AQI
65AQI
58AQI
49AQI
54AQI
42AQI
47AQI
40AQI
45AQI
45AQI
48AQI
51AQI
55AQI
66AQI
59AQI
53AQI
70AQI
71AQI
75AQI
67AQI
60AQI
62AQI
62AQI
51AQI
51AQI
48AQI
47AQI
54AQI
56AQI
51AQI
58AQI
53AQI
42AQI
42AQI
39AQI
38AQI
42AQI
51AQI
44AQI
47AQI
48AQI
47AQI
50AQI
52AQI
47AQI
44AQI
51AQI
51AQI
44AQI
42AQI
50AQI
39AQI
48AQI
51AQI
38AQI
39AQI
38AQI
43AQI
49AQI
54AQI
50AQI
51AQI
49AQI
41AQI
44AQI
48AQI
44AQI
36AQI
32AQI
29AQI
25AQI
23AQI
25AQI
24AQI
26AQI
38AQI
58AQI
48AQI
45AQI
47AQI
49AQI
72AQI
56AQI
81AQI
64AQI
63AQI
66AQI
56AQI
49AQI
41AQI
No. of days
202561AQI
Highest AQI recorded in
March81AQI
Lowest AQI recorded in
September41AQI
202462AQI
Highest AQI recorded in
April77AQI
Lowest AQI recorded in
September43AQI
202369AQI
Highest AQI recorded in
March94AQI
Lowest AQI recorded in
September52AQI
202270AQI
Highest AQI recorded in
February88AQI
Lowest AQI recorded in
August37AQI
202175AQI
Highest AQI recorded in
March108AQI
Lowest AQI recorded in
September50AQI
202066AQI
Highest AQI recorded in
December82AQI
Lowest AQI recorded in
September52AQI
Most & Least Polluted Years Over the Last 6 Years
Janghyeon Dong's annual 2025 AQI (61) shows an average percentage change of -10.6% (improved AQI) compared to previous years: 2020 (66), 2021 (75), 2022 (70), 2023 (69), 2024 (62).