Biel Bienne, Bern, Switzerland 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
Biel Bienne, Bern, Switzerland
AQI Trends: Highest and Lowest
Same Day Analysis (20th September ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 23 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Sep - 22nd Sep 2025
Biel Bienne, Bern, Switzerland
6 AM21st Sep 2025
8 PM
5 AM22nd Sep 2025
30AQI
22AQI
27AQI
14AQI
In the last 24 hours,
Biel Bienne's AQI reached its highest point of 30 at 9 AM during the Day, while the lowest point, 14, was recorded at 5 AM during the Night between 21st Sep and 22nd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Biel Bienne, Bern, Switzerland
14°C10/20°C
13°C9/21°C
15°C8/25°C
18°C10/28°C
18°C12/25°C
14°C11/17°C
14°C10/21°C
14°C11/19°C
17°C11/24°C
14°C9/19°C
13°C9/19°C
16°C10/23°C
14°C9/20°C
13°C8/18°C
13°C8/20°C
16°C10/24°C
17°C15/21°C
15°C10/19°C
14°C8/20°C
15°C11/19°C
14°C10/19°C
13°C9/20°C
15°C11/20°C
18°C13/24°C
12°C8/17°C
12°C6/19°C
17°C12/25°C
17°C11/25°C
19°C13/26°C
15°C10/22°C
--°C/°C
22AQI
21AQI
22AQI
20AQI
2025 Days Vs Air Quality
Biel Bienne, Bern, Switzerland
81%
212
19%
51
Total number of days with different AQI categories in last 265 days in 2025 (100 days remaining)
Under WHO’s Safe Air Quality Limits: 81%
Health Risk Level:
Low
In 2025, 81% of 265 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Biel Bienne, Bern, Switzerland
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
71AQI
48AQI
34AQI
49AQI
56AQI
36AQI
27AQI
27AQI
26AQI
24AQI
38AQI
45AQI
40AQI
59AQI
74AQI
54AQI
66AQI
69AQI
82AQI
80AQI
66AQI
64AQI
51AQI
42AQI
40AQI
31AQI
24AQI
24AQI
25AQI
33AQI
30AQI
36AQI
50AQI
54AQI
60AQI
69AQI
68AQI
65AQI
73AQI
70AQI
76AQI
79AQI
52AQI
48AQI
57AQI
67AQI
74AQI
74AQI
77AQI
79AQI
78AQI
66AQI
63AQI
50AQI
52AQI
46AQI
28AQI
31AQI
31AQI
37AQI
48AQI
57AQI
58AQI
57AQI
55AQI
55AQI
56AQI
61AQI
46AQI
43AQI
32AQI
42AQI
34AQI
54AQI
41AQI
44AQI
41AQI
51AQI
43AQI
41AQI
35AQI
19AQI
22AQI
26AQI
46AQI
43AQI
39AQI
53AQI
47AQI
29AQI
28AQI
32AQI
38AQI
36AQI
34AQI
30AQI
23AQI
34AQI
35AQI
37AQI
40AQI
37AQI
36AQI
28AQI
21AQI
19AQI
16AQI
17AQI
19AQI
18AQI
15AQI
16AQI
19AQI
14AQI
22AQI
24AQI
29AQI
26AQI
29AQI
27AQI
26AQI
24AQI
26AQI
18AQI
18AQI
19AQI
25AQI
32AQI
41AQI
28AQI
22AQI
18AQI
19AQI
21AQI
24AQI
16AQI
17AQI
23AQI
22AQI
25AQI
22AQI
23AQI
20AQI
16AQI
19AQI
17AQI
16AQI
15AQI
15AQI
18AQI
20AQI
20AQI
19AQI
18AQI
20AQI
16AQI
17AQI
16AQI
28AQI
30AQI
50AQI
58AQI
49AQI
52AQI
52AQI
42AQI
28AQI
29AQI
29AQI
34AQI
39AQI
34AQI
32AQI
35AQI
28AQI
24AQI
23AQI
22AQI
20AQI
22AQI
24AQI
26AQI
29AQI
28AQI
31AQI
31AQI
27AQI
21AQI
19AQI
18AQI
19AQI
21AQI
22AQI
23AQI
28AQI
23AQI
23AQI
20AQI
20AQI
22AQI
23AQI
19AQI
17AQI
16AQI
16AQI
17AQI
17AQI
19AQI
17AQI
18AQI
19AQI
22AQI
22AQI
23AQI
21AQI
22AQI
24AQI
23AQI
24AQI
26AQI
29AQI
34AQI
45AQI
54AQI
59AQI
57AQI
56AQI
58AQI
56AQI
50AQI
48AQI
44AQI
33AQI
29AQI
27AQI
26AQI
26AQI
29AQI
43AQI
34AQI
22AQI
18AQI
16AQI
15AQI
15AQI
17AQI
20AQI
18AQI
17AQI
19AQI
23AQI
24AQI
23AQI
20AQI
18AQI
17AQI
16AQI
15AQI
17AQI
18AQI
16AQI
19AQI
23AQI
46AQI
60AQI
44AQI
27AQI
21AQI
30AQI
22AQI
35AQI
19AQI
No. of days
202534AQI
Highest AQI recorded in
February60AQI
Lowest AQI recorded in
September19AQI
202414AQI
Highest AQI recorded in
December38AQI
Lowest AQI recorded in
July5AQI
202312AQI
Highest AQI recorded in
February37AQI
Lowest AQI recorded in
July5AQI
202229AQI
Highest AQI recorded in
October42AQI
Lowest AQI recorded in
November22AQI
Most & Least Polluted Years Over the Last 4 Years
Biel Bienne's annual 2025 AQI (34) shows an average percentage change of 112.7% (worsened AQI) compared to previous years: 2022 (29), 2023 (12), 2024 (14).