Bielefeld Ost, Bielefeld, North Rhine Westphalia, Germany 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
Bielefeld Ost, Bielefeld, North Rhine Westphalia, Germany
AQI Trends: Highest and Lowest
Same Day Analysis (17th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 50 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Oct - 18th Oct 2025
Bielefeld Ost, Bielefeld, North Rhine Westphalia, Germany
7 AM17th Oct 2025
7 PM
6 AM18th Oct 2025
61AQI
39AQI
57AQI
38AQI
In the last 24 hours,
Bielefeld Ost's AQI reached its highest point of 61 at 9 AM during the Day, while the lowest point, 38, was recorded at 7 PM during the Night between 17th Oct and 18th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Bielefeld Ost, Bielefeld, North Rhine Westphalia, Germany
18°C15/22°C
19°C14/27°C
22°C16/31°C
16°C11/19°C
12°C8/16°C
12°C7/17°C
12°C7/17°C
11°C9/14°C
12°C7/17°C
13°C10/17°C
15°C11/19°C
15°C12/16°C
12°C9/17°C
10°C6/15°C
10°C5/16°C
10°C7/14°C
11°C9/15°C
11°C9/13°C
11°C8/13°C
14°C12/17°C
14°C13/15°C
12°C10/15°C
14°C10/18°C
12°C10/15°C
13°C9/14°C
12°C10/14°C
11°C8/14°C
12°C11/13°C
11°C10/13°C
10°C8/11°C
--°C/°C
42AQI
39AQI
43AQI
40AQI
2025 Days Vs Air Quality
Bielefeld Ost, Bielefeld, North Rhine Westphalia, Germany
75%
218
23%
67
2%
5
Total number of days with different AQI categories in last 291 days in 2025 (74 days remaining)
Under WHO’s Safe Air Quality Limits: 75%
Health Risk Level:
Low
In 2025, 75% of 291 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
Bielefeld Ost, Bielefeld, North Rhine Westphalia, Germany
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
41AQI
28AQI
29AQI
42AQI
47AQI
24AQI
24AQI
24AQI
25AQI
32AQI
40AQI
33AQI
46AQI
57AQI
57AQI
47AQI
42AQI
48AQI
70AQI
67AQI
81AQI
74AQI
54AQI
29AQI
23AQI
26AQI
26AQI
28AQI
23AQI
22AQI
33AQI
62AQI
70AQI
69AQI
76AQI
67AQI
58AQI
48AQI
70AQI
99AQI
111AQI
112AQI
94AQI
133AQI
95AQI
61AQI
58AQI
57AQI
58AQI
56AQI
58AQI
68AQI
61AQI
45AQI
31AQI
37AQI
50AQI
34AQI
44AQI
49AQI
54AQI
57AQI
66AQI
70AQI
65AQI
58AQI
71AQI
99AQI
112AQI
113AQI
60AQI
47AQI
32AQI
38AQI
49AQI
26AQI
28AQI
44AQI
58AQI
59AQI
60AQI
67AQI
66AQI
82AQI
70AQI
38AQI
63AQI
58AQI
31AQI
27AQI
26AQI
27AQI
39AQI
48AQI
39AQI
17AQI
20AQI
24AQI
46AQI
44AQI
52AQI
54AQI
34AQI
48AQI
57AQI
33AQI
35AQI
23AQI
26AQI
55AQI
59AQI
38AQI
54AQI
41AQI
52AQI
53AQI
25AQI
29AQI
40AQI
29AQI
39AQI
43AQI
40AQI
23AQI
20AQI
20AQI
29AQI
21AQI
21AQI
21AQI
23AQI
18AQI
23AQI
31AQI
31AQI
23AQI
34AQI
35AQI
28AQI
26AQI
29AQI
31AQI
20AQI
18AQI
21AQI
23AQI
26AQI
16AQI
18AQI
24AQI
38AQI
33AQI
40AQI
29AQI
37AQI
22AQI
16AQI
16AQI
16AQI
24AQI
52AQI
42AQI
42AQI
48AQI
50AQI
48AQI
31AQI
34AQI
37AQI
34AQI
24AQI
28AQI
29AQI
31AQI
23AQI
25AQI
25AQI
25AQI
28AQI
27AQI
26AQI
24AQI
34AQI
33AQI
23AQI
21AQI
20AQI
19AQI
19AQI
22AQI
25AQI
23AQI
20AQI
27AQI
29AQI
39AQI
26AQI
24AQI
29AQI
35AQI
33AQI
24AQI
20AQI
28AQI
29AQI
27AQI
28AQI
39AQI
26AQI
22AQI
21AQI
22AQI
24AQI
21AQI
21AQI
23AQI
24AQI
23AQI
27AQI
29AQI
36AQI
38AQI
33AQI
44AQI
55AQI
61AQI
63AQI
56AQI
39AQI
26AQI
26AQI
33AQI
28AQI
22AQI
21AQI
20AQI
20AQI
26AQI
35AQI
44AQI
29AQI
20AQI
19AQI
17AQI
18AQI
17AQI
18AQI
19AQI
20AQI
22AQI
23AQI
40AQI
37AQI
24AQI
18AQI
18AQI
17AQI
16AQI
18AQI
19AQI
20AQI
23AQI
25AQI
29AQI
20AQI
18AQI
15AQI
19AQI
18AQI
24AQI
36AQI
58AQI
53AQI
42AQI
50AQI
49AQI
50AQI
53AQI
42AQI
59AQI
63AQI
53AQI
50AQI
51AQI
51AQI
44AQI
53AQI
52AQI
52AQI
50AQI
40AQI
67AQI
59AQI
39AQI
26AQI
31AQI
26AQI
32AQI
24AQI
51AQI
No. of days
202539AQI
Highest AQI recorded in
February67AQI
Lowest AQI recorded in
September24AQI
202436AQI
Highest AQI recorded in
March51AQI
Lowest AQI recorded in
October29AQI
202337AQI
Highest AQI recorded in
February64AQI
Lowest AQI recorded in
November28AQI
202231AQI
Highest AQI recorded in
December54AQI
Lowest AQI recorded in
January22AQI
202121AQI
Highest AQI recorded in
June29AQI
Lowest AQI recorded in
January15AQI
202022AQI
Highest AQI recorded in
April29AQI
Lowest AQI recorded in
December14AQI
Most & Least Polluted Years Over the Last 6 Years
Bielefeld Ost's annual 2025 AQI (39) shows an average percentage change of 38.6% (worsened AQI) compared to previous years: 2020 (22), 2021 (21), 2022 (31), 2023 (37), 2024 (36).