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!
November Air Quality Analysis
Osan, Gyeonggi, South Korea
AQI Trends: Highest and Lowest
Same Day Analysis (4th November ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 70 of Moderate air quality, showing improvement over 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 5th Nov - 6th Nov 2025
Osan, Gyeonggi, South Korea
6 AM5th Nov 2025
5 PM
5 AM6th Nov 2025
AQI
AQI
86AQI
68AQI
In the last 24 hours,
Osan's AQI reached its highest point of 86 at 12 AM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 5th Nov and 6th Nov 2025.
Day & Night AQI Trend : Oct - Nov 2025
Osan, Gyeonggi, South Korea
19°C16/20°C
21°C18/26°C
21°C19/24°C
18°C18/20°C
21°C18/26°C
20°C18/21°C
17°C15/18°C
16°C15/17°C
19°C17/24°C
19°C17/23°C
19°C15/23°C
17°C15/19°C
15°C10/19°C
11°C7/16°C
11°C9/14°C
13°C9/17°C
16°C13/18°C
15°C12/19°C
15°C13/17°C
14°C12/15°C
9°C6/12°C
8°C4/12°C
10°C6/16°C
12°C8/16°C
14°C10/19°C
13°C11/16°C
10°C5/11°C
7°C3/12°C
9°C6/14°C
--°C/°C
--°C/°C
50AQI
46AQI
57AQI
50AQI
2025 Days Vs Air Quality
Osan, Gyeonggi, South Korea
32%
100
62%
190
6%
18
Total number of days with different AQI categories in last 309 days in 2025 (56 days remaining)
Under WHO’s Safe Air Quality Limits: 32%
Health Risk Level:
High
In 2025, 32% of 309 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
Osan, Gyeonggi, South Korea
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
77AQI
63AQI
63AQI
66AQI
69AQI
98AQI
57AQI
71AQI
43AQI
57AQI
58AQI
81AQI
88AQI
101AQI
56AQI
77AQI
86AQI
84AQI
87AQI
131AQI
144AQI
150AQI
130AQI
107AQI
75AQI
57AQI
68AQI
55AQI
60AQI
52AQI
73AQI
74AQI
86AQI
53AQI
53AQI
44AQI
56AQI
47AQI
45AQI
49AQI
58AQI
71AQI
76AQI
51AQI
92AQI
58AQI
114AQI
51AQI
63AQI
47AQI
57AQI
54AQI
58AQI
54AQI
58AQI
56AQI
71AQI
60AQI
83AQI
101AQI
73AQI
56AQI
46AQI
37AQI
78AQI
94AQI
91AQI
108AQI
114AQI
110AQI
107AQI
98AQI
83AQI
58AQI
76AQI
64AQI
73AQI
82AQI
91AQI
105AQI
108AQI
117AQI
117AQI
133AQI
94AQI
95AQI
63AQI
51AQI
48AQI
63AQI
79AQI
86AQI
83AQI
88AQI
77AQI
73AQI
74AQI
80AQI
72AQI
79AQI
91AQI
67AQI
66AQI
46AQI
60AQI
63AQI
71AQI
87AQI
58AQI
67AQI
55AQI
51AQI
35AQI
67AQI
63AQI
58AQI
44AQI
63AQI
71AQI
60AQI
63AQI
52AQI
51AQI
49AQI
54AQI
43AQI
56AQI
66AQI
51AQI
63AQI
73AQI
74AQI
75AQI
75AQI
64AQI
54AQI
51AQI
59AQI
62AQI
40AQI
52AQI
48AQI
64AQI
47AQI
51AQI
65AQI
86AQI
91AQI
84AQI
80AQI
87AQI
92AQI
104AQI
81AQI
62AQI
60AQI
60AQI
71AQI
60AQI
66AQI
57AQI
55AQI
63AQI
80AQI
60AQI
58AQI
66AQI
64AQI
68AQI
65AQI
46AQI
62AQI
71AQI
73AQI
64AQI
49AQI
60AQI
69AQI
66AQI
49AQI
45AQI
44AQI
44AQI
54AQI
52AQI
51AQI
55AQI
68AQI
71AQI
58AQI
52AQI
50AQI
48AQI
64AQI
59AQI
44AQI
53AQI
39AQI
43AQI
36AQI
41AQI
41AQI
41AQI
48AQI
55AQI
61AQI
47AQI
44AQI
62AQI
69AQI
60AQI
60AQI
58AQI
61AQI
61AQI
50AQI
51AQI
45AQI
50AQI
57AQI
56AQI
55AQI
58AQI
48AQI
40AQI
42AQI
39AQI
38AQI
42AQI
51AQI
44AQI
46AQI
47AQI
47AQI
50AQI
53AQI
48AQI
44AQI
51AQI
52AQI
46AQI
44AQI
49AQI
41AQI
48AQI
50AQI
37AQI
36AQI
39AQI
41AQI
48AQI
53AQI
50AQI
49AQI
46AQI
38AQI
43AQI
49AQI
44AQI
37AQI
32AQI
32AQI
30AQI
25AQI
27AQI
27AQI
30AQI
47AQI
71AQI
58AQI
47AQI
56AQI
64AQI
76AQI
69AQI
66AQI
43AQI
46AQI
40AQI
34AQI
44AQI
46AQI
43AQI
52AQI
48AQI
36AQI
36AQI
49AQI
34AQI
41AQI
47AQI
60AQI
58AQI
59AQI
45AQI
30AQI
37AQI
50AQI
72AQI
57AQI
35AQI
60AQI
77AQI
93AQI
62AQI
45AQI
48AQI
70AQI
80AQI
62AQI
85AQI
68AQI
62AQI
65AQI
52AQI
49AQI
43AQI
51AQI
56AQI
No. of days
202562AQI
Highest AQI recorded in
March85AQI
Lowest AQI recorded in
September43AQI
202463AQI
Highest AQI recorded in
April77AQI
Lowest AQI recorded in
September43AQI
202370AQI
Highest AQI recorded in
March96AQI
Lowest AQI recorded in
September51AQI
202271AQI
Highest AQI recorded in
February86AQI
Lowest AQI recorded in
August38AQI
202168AQI
Highest AQI recorded in
March96AQI
Lowest AQI recorded in
September38AQI
202065AQI
Highest AQI recorded in
December79AQI
Lowest AQI recorded in
September47AQI
Most & Least Polluted Years Over the Last 6 Years
Osan's annual 2025 AQI (62) shows an average percentage change of -8.2% (improved AQI) compared to previous years: 2020 (65), 2021 (68), 2022 (71), 2023 (70), 2024 (63).