Decin, Ustecky Kraj, Czechia 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
Decin, Ustecky Kraj, Czechia
AQI Trends: Highest and Lowest
Same Day Analysis (16th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 22 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 16th Sep - 17th Sep 2025
Decin, Ustecky Kraj, Czechia
6 AM16th Sep 2025
7 PM
5 AM17th Sep 2025
27AQI
18AQI
22AQI
15AQI
In the last 24 hours,
Decin's AQI reached its highest point of 27 at 12 PM during the Day, while the lowest point, 15, was recorded at 5 AM during the Night between 16th Sep and 17th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Decin, Ustecky Kraj, Czechia
17°C10/23°C
18°C11/25°C
19°C14/25°C
18°C13/24°C
14°C8/19°C
11°C7/15°C
12°C6/17°C
15°C8/22°C
16°C10/23°C
18°C13/25°C
20°C15/30°C
17°C15/21°C
17°C14/22°C
18°C12/24°C
19°C13/25°C
16°C14/18°C
17°C12/23°C
19°C14/25°C
17°C13/20°C
15°C12/19°C
15°C10/20°C
15°C11/22°C
17°C12/23°C
17°C13/21°C
15°C11/21°C
14°C10/20°C
13°C9/18°C
13°C9/16°C
14°C9/20°C
14°C11/18°C
--°C/°C
34AQI
27AQI
30AQI
27AQI
2025 Days Vs Air Quality
Decin, Ustecky Kraj, Czechia
64%
166
29%
75
7%
18
Total number of days with different AQI categories in last 260 days in 2025 (105 days remaining)
Under WHO’s Safe Air Quality Limits: 64%
Health Risk Level:
Moderate
In 2025, 64% of 260 days were within WHO’s safe air quality limits, and 36% exceeded them. The risk of health issues is Moderate, particularly for individuals with respiratory or heart conditions.
Annual Air Quality Insights
Decin, Ustecky Kraj, Czechia
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
71AQI
38AQI
42AQI
38AQI
72AQI
73AQI
77AQI
56AQI
42AQI
32AQI
29AQI
32AQI
43AQI
81AQI
66AQI
47AQI
57AQI
91AQI
131AQI
91AQI
76AQI
82AQI
63AQI
72AQI
60AQI
60AQI
63AQI
63AQI
42AQI
70AQI
57AQI
71AQI
70AQI
92AQI
122AQI
136AQI
58AQI
60AQI
87AQI
101AQI
129AQI
117AQI
90AQI
74AQI
100AQI
48AQI
94AQI
94AQI
95AQI
104AQI
104AQI
96AQI
86AQI
130AQI
143AQI
133AQI
89AQI
64AQI
55AQI
57AQI
58AQI
81AQI
86AQI
105AQI
108AQI
113AQI
114AQI
115AQI
123AQI
127AQI
99AQI
47AQI
65AQI
63AQI
67AQI
47AQI
61AQI
72AQI
79AQI
85AQI
79AQI
59AQI
86AQI
86AQI
86AQI
53AQI
62AQI
92AQI
41AQI
33AQI
39AQI
53AQI
59AQI
58AQI
56AQI
21AQI
37AQI
38AQI
46AQI
44AQI
51AQI
65AQI
55AQI
57AQI
49AQI
52AQI
53AQI
38AQI
23AQI
47AQI
40AQI
35AQI
36AQI
49AQI
41AQI
39AQI
35AQI
43AQI
46AQI
51AQI
69AQI
49AQI
51AQI
27AQI
22AQI
24AQI
34AQI
27AQI
32AQI
38AQI
33AQI
30AQI
41AQI
44AQI
34AQI
24AQI
22AQI
19AQI
22AQI
34AQI
42AQI
41AQI
24AQI
26AQI
30AQI
31AQI
28AQI
24AQI
18AQI
22AQI
34AQI
40AQI
33AQI
50AQI
36AQI
28AQI
23AQI
17AQI
23AQI
22AQI
45AQI
37AQI
48AQI
44AQI
37AQI
47AQI
36AQI
37AQI
46AQI
51AQI
40AQI
36AQI
28AQI
47AQI
39AQI
29AQI
37AQI
30AQI
26AQI
33AQI
27AQI
32AQI
37AQI
50AQI
37AQI
35AQI
40AQI
33AQI
26AQI
24AQI
23AQI
22AQI
22AQI
32AQI
41AQI
42AQI
33AQI
29AQI
23AQI
30AQI
43AQI
49AQI
30AQI
26AQI
30AQI
37AQI
41AQI
35AQI
36AQI
32AQI
31AQI
25AQI
25AQI
28AQI
25AQI
24AQI
28AQI
25AQI
26AQI
40AQI
49AQI
58AQI
43AQI
39AQI
48AQI
59AQI
61AQI
59AQI
46AQI
28AQI
28AQI
38AQI
39AQI
34AQI
24AQI
19AQI
21AQI
29AQI
38AQI
48AQI
36AQI
36AQI
27AQI
27AQI
27AQI
25AQI
25AQI
24AQI
23AQI
26AQI
26AQI
42AQI
47AQI
33AQI
22AQI
22AQI
24AQI
20AQI
22AQI
62AQI
94AQI
79AQI
45AQI
32AQI
36AQI
33AQI
36AQI
27AQI
No. of days
202550AQI
Highest AQI recorded in
February94AQI
Lowest AQI recorded in
September27AQI
202455AQI
Highest AQI recorded in
January76AQI
Lowest AQI recorded in
July44AQI
202356AQI
Highest AQI recorded in
February69AQI
Lowest AQI recorded in
July47AQI
202262AQI
Highest AQI recorded in
March88AQI
Lowest AQI recorded in
July49AQI
202160AQI
Highest AQI recorded in
December73AQI
Lowest AQI recorded in
August41AQI
202054AQI
Highest AQI recorded in
March82AQI
Lowest AQI recorded in
July43AQI
Most & Least Polluted Years Over the Last 6 Years
Decin's annual 2025 AQI (50) shows an average percentage change of -11.9% (improved AQI) compared to previous years: 2020 (54), 2021 (60), 2022 (62), 2023 (56), 2024 (55).