Brno, Jihomoravsky Kraj, Czechia Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Brno, Jihomoravsky Kraj, Czechia
AQI Trends: Highest and Lowest
Same Day Analysis (4th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 70 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 5th Oct - 6th Oct 2025
Brno, Jihomoravsky Kraj, Czechia
6 AM5th Oct 2025
6 PM
5 AM6th Oct 2025
AQI
AQI
54AQI
41AQI
In the last 24 hours,
Brno's AQI reached its highest point of 54 at 11 PM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 5th Oct and 6th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Brno, Jihomoravsky Kraj, Czechia
16°C12/21°C
16°C10/23°C
17°C10/24°C
18°C12/25°C
17°C15/20°C
18°C14/24°C
16°C13/19°C
16°C12/22°C
15°C9/18°C
15°C8/22°C
15°C10/19°C
14°C10/19°C
14°C8/22°C
19°C12/26°C
20°C14/27°C
20°C13/28°C
19°C13/26°C
12°C10/14°C
10°C9/12°C
9°C7/10°C
10°C8/14°C
12°C9/18°C
12°C7/18°C
9°C5/14°C
8°C4/13°C
7°C4/10°C
7°C2/13°C
6°C1/13°C
7°C1/13°C
--°C/°C
--°C/°C
34AQI
30AQI
34AQI
30AQI
2025 Days Vs Air Quality
Brno, Jihomoravsky Kraj, Czechia
69%
190
29%
80
3%
7
Total number of days with different AQI categories in last 278 days in 2025 (87 days remaining)
Under WHO’s Safe Air Quality Limits: 69%
Health Risk Level:
Moderate
In 2025, 69% of 278 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
Brno, Jihomoravsky Kraj, Czechia
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
85AQI
87AQI
56AQI
37AQI
62AQI
75AQI
77AQI
56AQI
57AQI
27AQI
27AQI
24AQI
32AQI
69AQI
72AQI
56AQI
61AQI
76AQI
71AQI
54AQI
63AQI
72AQI
65AQI
82AQI
70AQI
67AQI
56AQI
45AQI
35AQI
55AQI
63AQI
58AQI
61AQI
76AQI
96AQI
113AQI
63AQI
87AQI
77AQI
69AQI
88AQI
124AQI
80AQI
88AQI
86AQI
74AQI
68AQI
78AQI
75AQI
88AQI
96AQI
91AQI
83AQI
107AQI
133AQI
125AQI
136AQI
114AQI
59AQI
60AQI
54AQI
65AQI
83AQI
88AQI
91AQI
81AQI
89AQI
94AQI
70AQI
62AQI
50AQI
30AQI
55AQI
55AQI
46AQI
45AQI
42AQI
60AQI
70AQI
76AQI
67AQI
53AQI
70AQI
75AQI
73AQI
51AQI
67AQI
77AQI
60AQI
28AQI
46AQI
59AQI
50AQI
46AQI
46AQI
26AQI
21AQI
30AQI
34AQI
42AQI
46AQI
47AQI
45AQI
49AQI
50AQI
49AQI
50AQI
29AQI
24AQI
25AQI
43AQI
23AQI
28AQI
44AQI
25AQI
29AQI
28AQI
33AQI
42AQI
40AQI
50AQI
37AQI
49AQI
29AQI
28AQI
34AQI
39AQI
26AQI
29AQI
29AQI
26AQI
37AQI
36AQI
42AQI
32AQI
20AQI
23AQI
17AQI
20AQI
33AQI
36AQI
38AQI
24AQI
26AQI
28AQI
29AQI
30AQI
31AQI
18AQI
25AQI
36AQI
33AQI
36AQI
37AQI
37AQI
27AQI
27AQI
20AQI
20AQI
22AQI
35AQI
45AQI
42AQI
37AQI
32AQI
41AQI
41AQI
34AQI
40AQI
50AQI
35AQI
30AQI
26AQI
38AQI
36AQI
32AQI
34AQI
30AQI
26AQI
29AQI
30AQI
29AQI
28AQI
38AQI
37AQI
32AQI
37AQI
36AQI
27AQI
23AQI
21AQI
21AQI
23AQI
27AQI
31AQI
32AQI
35AQI
29AQI
28AQI
29AQI
35AQI
47AQI
37AQI
31AQI
35AQI
38AQI
47AQI
45AQI
45AQI
41AQI
40AQI
33AQI
31AQI
35AQI
32AQI
35AQI
37AQI
36AQI
34AQI
43AQI
48AQI
56AQI
55AQI
47AQI
49AQI
56AQI
59AQI
62AQI
55AQI
38AQI
28AQI
32AQI
44AQI
40AQI
26AQI
17AQI
19AQI
25AQI
35AQI
47AQI
43AQI
29AQI
25AQI
32AQI
34AQI
29AQI
27AQI
26AQI
19AQI
20AQI
27AQI
31AQI
37AQI
24AQI
22AQI
23AQI
28AQI
19AQI
20AQI
19AQI
24AQI
28AQI
30AQI
28AQI
30AQI
22AQI
23AQI
22AQI
31AQI
32AQI
36AQI
45AQI
45AQI
46AQI
58AQI
60AQI
70AQI
59AQI
89AQI
64AQI
38AQI
31AQI
33AQI
33AQI
39AQI
28AQI
59AQI
No. of days
202546AQI
Highest AQI recorded in
February89AQI
Lowest AQI recorded in
September28AQI
202451AQI
Highest AQI recorded in
January65AQI
Lowest AQI recorded in
July38AQI
202345AQI
Highest AQI recorded in
December64AQI
Lowest AQI recorded in
July35AQI
202253AQI
Highest AQI recorded in
March79AQI
Lowest AQI recorded in
August36AQI
202152AQI
Highest AQI recorded in
February83AQI
Lowest AQI recorded in
August35AQI
202047AQI
Highest AQI recorded in
December91AQI
Lowest AQI recorded in
July36AQI
Most & Least Polluted Years Over the Last 6 Years
Brno's annual 2025 AQI (46) shows an average percentage change of -6.7% (improved AQI) compared to previous years: 2020 (47), 2021 (52), 2022 (53), 2023 (45), 2024 (51).