Part Dong, Osan, 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
Part Dong, Osan, Gyeonggi, South Korea
AQI Trends: Highest and Lowest
Same Day Analysis (17th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 44 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: 17th Sep - 18th Sep 2025
Part Dong, Osan, Gyeonggi, South Korea
6 AM17th Sep 2025
6 PM
5 AM18th Sep 2025
AQI
AQI
53AQI
20AQI
In the last 24 hours,
Part Dong's AQI reached its highest point of 53 at 8 AM during the Night, while the lowest point, 20, was recorded at 3 PM during the Night between 17th Sep and 18th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Part Dong, Osan, Gyeonggi, South Korea
27°C23/30°C
27°C23/31°C
27°C24/32°C
27°C24/32°C
27°C24/32°C
28°C24/33°C
28°C24/33°C
26°C23/29°C
25°C21/30°C
26°C22/31°C
27°C24/31°C
27°C24/31°C
27°C23/32°C
25°C23/29°C
24°C21/29°C
25°C20/31°C
23°C22/26°C
26°C22/31°C
26°C23/30°C
25°C21/28°C
23°C20/28°C
23°C20/26°C
23°C19/30°C
24°C19/30°C
22°C20/25°C
23°C20/25°C
23°C21/27°C
24°C20/29°C
24°C21/28°C
--°C/°C
--°C/°C
49AQI
43AQI
48AQI
46AQI
2025 Days Vs Air Quality
Part Dong, Osan, Gyeonggi, South Korea
27%
69
67%
174
7%
17
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 27%
Health Risk Level:
Very high
In 2025, 27% 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
Part Dong, Osan, Gyeonggi, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
75AQI
61AQI
60AQI
64AQI
67AQI
98AQI
56AQI
70AQI
40AQI
56AQI
56AQI
80AQI
86AQI
100AQI
55AQI
75AQI
85AQI
84AQI
87AQI
130AQI
145AQI
146AQI
131AQI
105AQI
74AQI
57AQI
66AQI
56AQI
60AQI
52AQI
73AQI
72AQI
84AQI
53AQI
53AQI
45AQI
56AQI
47AQI
47AQI
50AQI
59AQI
72AQI
75AQI
50AQI
92AQI
57AQI
114AQI
50AQI
61AQI
48AQI
56AQI
55AQI
57AQI
54AQI
57AQI
58AQI
71AQI
60AQI
83AQI
103AQI
72AQI
56AQI
46AQI
37AQI
78AQI
94AQI
90AQI
109AQI
115AQI
114AQI
108AQI
98AQI
84AQI
58AQI
75AQI
64AQI
72AQI
83AQI
91AQI
109AQI
111AQI
122AQI
119AQI
133AQI
93AQI
95AQI
61AQI
51AQI
48AQI
63AQI
80AQI
87AQI
83AQI
94AQI
77AQI
74AQI
74AQI
80AQI
72AQI
80AQI
92AQI
67AQI
67AQI
45AQI
60AQI
64AQI
70AQI
89AQI
59AQI
68AQI
56AQI
51AQI
35AQI
67AQI
64AQI
59AQI
46AQI
66AQI
72AQI
61AQI
63AQI
54AQI
51AQI
49AQI
54AQI
41AQI
56AQI
65AQI
50AQI
63AQI
74AQI
74AQI
74AQI
75AQI
64AQI
53AQI
52AQI
59AQI
62AQI
39AQI
52AQI
48AQI
64AQI
45AQI
50AQI
64AQI
85AQI
91AQI
82AQI
78AQI
84AQI
90AQI
106AQI
80AQI
61AQI
61AQI
59AQI
70AQI
60AQI
66AQI
56AQI
54AQI
61AQI
81AQI
59AQI
57AQI
68AQI
61AQI
66AQI
64AQI
45AQI
63AQI
71AQI
73AQI
62AQI
47AQI
61AQI
70AQI
68AQI
49AQI
45AQI
43AQI
47AQI
56AQI
54AQI
52AQI
57AQI
72AQI
73AQI
59AQI
53AQI
50AQI
47AQI
66AQI
60AQI
42AQI
52AQI
37AQI
40AQI
33AQI
39AQI
41AQI
39AQI
48AQI
55AQI
60AQI
44AQI
41AQI
60AQI
68AQI
58AQI
60AQI
58AQI
60AQI
62AQI
52AQI
50AQI
46AQI
51AQI
56AQI
55AQI
54AQI
58AQI
50AQI
42AQI
46AQI
42AQI
41AQI
43AQI
53AQI
45AQI
47AQI
48AQI
49AQI
51AQI
55AQI
51AQI
46AQI
51AQI
52AQI
48AQI
46AQI
49AQI
43AQI
49AQI
50AQI
37AQI
34AQI
42AQI
41AQI
48AQI
53AQI
51AQI
51AQI
46AQI
41AQI
44AQI
48AQI
44AQI
44AQI
79AQI
62AQI
86AQI
69AQI
62AQI
64AQI
52AQI
50AQI
45AQI
No. of days
202564AQI
Highest AQI recorded in
March86AQI
Lowest AQI recorded in
September45AQI
202462AQI
Highest AQI recorded in
April78AQI
Lowest AQI recorded in
September40AQI
202367AQI
Highest AQI recorded in
March93AQI
Lowest AQI recorded in
July43AQI
202268AQI
Highest AQI recorded in
February83AQI
Lowest AQI recorded in
August26AQI
202163AQI
Highest AQI recorded in
March93AQI
Lowest AQI recorded in
September32AQI
202057AQI
Highest AQI recorded in
December74AQI
Lowest AQI recorded in
August33AQI
Most & Least Polluted Years Over the Last 6 Years
Part Dong's annual 2025 AQI (64) shows an average percentage change of 1.5% (worsened AQI) compared to previous years: 2020 (57), 2021 (63), 2022 (68), 2023 (67), 2024 (62).