Plzen Roudna, Plzen, Plzensky 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
Plzen Roudna, Plzen, Plzensky Kraj, Czechia
AQI Trends: Highest and Lowest
Same Day Analysis (20th September ):
On this day, AQI across the 2 years varied significantly: 2025 ranks 2nd highest AQI at 30 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Sep - 21st Sep 2025
Plzen Roudna, Plzen, Plzensky Kraj, Czechia
6 AM20th Sep 2025
7 PM
5 AM21st Sep 2025
39AQI
25AQI
58AQI
30AQI
In the last 24 hours,
Plzen Roudna's AQI reached its highest point of 58 at 3 AM during the Night, while the lowest point, 25, was recorded at 9 AM during the Day between 20th Sep and 21st Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Plzen Roudna, Plzen, Plzensky Kraj, Czechia
15°C10/21°C
13°C9/17°C
13°C6/21°C
15°C7/23°C
17°C10/26°C
20°C13/27°C
20°C15/29°C
17°C14/21°C
17°C12/22°C
18°C12/25°C
19°C12/26°C
17°C14/21°C
17°C12/23°C
19°C13/26°C
16°C13/21°C
16°C12/21°C
16°C11/21°C
16°C11/23°C
17°C11/23°C
15°C12/20°C
15°C11/21°C
14°C11/18°C
15°C10/21°C
14°C10/17°C
16°C10/21°C
14°C11/19°C
13°C9/19°C
17°C11/24°C
18°C12/26°C
19°C12/28°C
--°C/°C
29AQI
22AQI
25AQI
22AQI
2025 Days Vs Air Quality
Plzen Roudna, Plzen, Plzensky Kraj, Czechia
69%
181
26%
68
5%
14
Total number of days with different AQI categories in last 264 days in 2025 (101 days remaining)
Under WHO’s Safe Air Quality Limits: 69%
Health Risk Level:
Moderate
In 2025, 69% of 264 days were within WHO’s safe air quality limits, and 31% exceeded them. The risk of health issues is Moderate, particularly for individuals with respiratory or heart conditions.
Annual Air Quality Insights
Plzen Roudna, Plzen, Plzensky Kraj, Czechia
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
78AQI
44AQI
31AQI
35AQI
73AQI
103AQI
30AQI
24AQI
29AQI
23AQI
24AQI
27AQI
40AQI
84AQI
51AQI
67AQI
54AQI
77AQI
86AQI
81AQI
87AQI
82AQI
56AQI
46AQI
73AQI
57AQI
57AQI
26AQI
26AQI
66AQI
51AQI
61AQI
63AQI
96AQI
114AQI
100AQI
58AQI
66AQI
101AQI
110AQI
114AQI
98AQI
91AQI
80AQI
89AQI
65AQI
62AQI
79AQI
72AQI
83AQI
109AQI
138AQI
112AQI
140AQI
97AQI
108AQI
73AQI
53AQI
59AQI
54AQI
53AQI
73AQI
82AQI
83AQI
95AQI
110AQI
121AQI
123AQI
112AQI
66AQI
76AQI
58AQI
61AQI
63AQI
57AQI
47AQI
51AQI
58AQI
72AQI
72AQI
63AQI
65AQI
72AQI
74AQI
66AQI
50AQI
69AQI
83AQI
42AQI
25AQI
36AQI
42AQI
51AQI
44AQI
47AQI
24AQI
26AQI
36AQI
45AQI
38AQI
38AQI
37AQI
45AQI
49AQI
35AQI
41AQI
47AQI
30AQI
25AQI
30AQI
23AQI
21AQI
24AQI
28AQI
25AQI
32AQI
27AQI
32AQI
36AQI
37AQI
52AQI
45AQI
47AQI
26AQI
24AQI
24AQI
31AQI
26AQI
28AQI
29AQI
30AQI
30AQI
38AQI
39AQI
34AQI
21AQI
21AQI
18AQI
21AQI
28AQI
35AQI
35AQI
28AQI
25AQI
26AQI
24AQI
25AQI
20AQI
15AQI
19AQI
30AQI
30AQI
28AQI
34AQI
27AQI
22AQI
17AQI
15AQI
20AQI
22AQI
47AQI
43AQI
45AQI
48AQI
36AQI
50AQI
35AQI
31AQI
42AQI
51AQI
34AQI
34AQI
36AQI
44AQI
32AQI
30AQI
36AQI
30AQI
27AQI
29AQI
28AQI
29AQI
38AQI
42AQI
33AQI
35AQI
37AQI
27AQI
20AQI
20AQI
20AQI
22AQI
23AQI
27AQI
35AQI
33AQI
37AQI
24AQI
26AQI
28AQI
38AQI
43AQI
24AQI
18AQI
27AQI
31AQI
35AQI
32AQI
25AQI
27AQI
24AQI
22AQI
23AQI
23AQI
21AQI
24AQI
24AQI
23AQI
25AQI
38AQI
46AQI
56AQI
46AQI
41AQI
51AQI
59AQI
63AQI
63AQI
52AQI
31AQI
30AQI
37AQI
44AQI
34AQI
23AQI
19AQI
20AQI
27AQI
39AQI
49AQI
26AQI
22AQI
21AQI
19AQI
20AQI
19AQI
20AQI
19AQI
18AQI
21AQI
24AQI
31AQI
31AQI
25AQI
19AQI
18AQI
20AQI
16AQI
17AQI
17AQI
20AQI
25AQI
30AQI
54AQI
89AQI
71AQI
35AQI
29AQI
33AQI
29AQI
35AQI
21AQI
No. of days
202545AQI
Highest AQI recorded in
February89AQI
Lowest AQI recorded in
September21AQI
202443AQI
Highest AQI recorded in
November55AQI
Lowest AQI recorded in
April25AQI
202336AQI
Highest AQI recorded in
December37AQI
Lowest AQI recorded in
November32AQI
202154AQI
Highest AQI recorded in
March71AQI
Lowest AQI recorded in
May35AQI
202051AQI
Highest AQI recorded in
December94AQI
Lowest AQI recorded in
July24AQI
Most & Least Polluted Years Over the Last 5 Years
Plzen Roudna's annual 2025 AQI (45) shows an average percentage change of -0.8% (improved AQI) compared to previous years: 2020 (51), 2021 (54), 2023 (36), 2024 (43).