Zierbena, Portugalete, Basque Country, Spain 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
Zierbena, Portugalete, Basque Country, Spain
AQI Trends: Highest and Lowest
Same Day Analysis (11th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 50 of Good air quality, showing improvement over 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 11th Oct - 12th Oct 2025
Zierbena, Portugalete, Basque Country, Spain
8 AM11th Oct 2025
8 PM
7 AM12th Oct 2025
64AQI
40AQI
58AQI
50AQI
In the last 24 hours,
Zierbena's AQI reached its highest point of 64 at 12 PM during the Day, while the lowest point, 40, was recorded at 2 PM during the Day between 11th Oct and 12th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Zierbena, Portugalete, Basque Country, Spain
18°C17/19°C
18°C15/22°C
20°C15/26°C
18°C17/21°C
18°C16/23°C
20°C15/25°C
21°C16/29°C
24°C19/32°C
21°C17/26°C
14°C13/16°C
14°C12/16°C
14°C12/15°C
14°C12/17°C
14°C11/18°C
15°C12/19°C
18°C12/25°C
19°C16/22°C
17°C15/20°C
17°C15/20°C
16°C13/20°C
17°C13/23°C
18°C16/21°C
17°C14/22°C
15°C13/17°C
16°C12/21°C
18°C14/24°C
17°C15/21°C
16°C15/19°C
15°C12/18°C
15°C11/21°C
--°C/°C
38AQI
36AQI
36AQI
36AQI
2025 Days Vs Air Quality
Zierbena, Portugalete, Basque Country, Spain
90%
257
10%
27
Total number of days with different AQI categories in last 285 days in 2025 (80 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2025, 90% of 285 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Zierbena, Portugalete, Basque Country, Spain
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
43AQI
38AQI
37AQI
35AQI
32AQI
29AQI
28AQI
27AQI
28AQI
27AQI
30AQI
29AQI
33AQI
38AQI
44AQI
48AQI
51AQI
52AQI
52AQI
49AQI
43AQI
37AQI
35AQI
34AQI
29AQI
28AQI
30AQI
30AQI
30AQI
30AQI
35AQI
32AQI
31AQI
32AQI
37AQI
43AQI
48AQI
45AQI
41AQI
40AQI
40AQI
41AQI
36AQI
37AQI
38AQI
38AQI
41AQI
42AQI
45AQI
51AQI
48AQI
46AQI
41AQI
38AQI
35AQI
32AQI
32AQI
37AQI
41AQI
40AQI
35AQI
40AQI
47AQI
50AQI
42AQI
36AQI
30AQI
30AQI
28AQI
29AQI
28AQI
27AQI
27AQI
29AQI
28AQI
29AQI
28AQI
26AQI
31AQI
30AQI
27AQI
26AQI
28AQI
31AQI
31AQI
34AQI
32AQI
31AQI
32AQI
35AQI
39AQI
41AQI
35AQI
34AQI
28AQI
28AQI
29AQI
40AQI
49AQI
50AQI
46AQI
46AQI
41AQI
37AQI
28AQI
22AQI
19AQI
18AQI
18AQI
18AQI
19AQI
19AQI
21AQI
22AQI
25AQI
24AQI
23AQI
34AQI
32AQI
30AQI
32AQI
37AQI
32AQI
31AQI
27AQI
25AQI
28AQI
32AQI
39AQI
35AQI
32AQI
32AQI
32AQI
32AQI
28AQI
34AQI
41AQI
45AQI
37AQI
36AQI
37AQI
31AQI
32AQI
32AQI
32AQI
27AQI
28AQI
33AQI
38AQI
43AQI
38AQI
29AQI
29AQI
35AQI
37AQI
33AQI
30AQI
26AQI
39AQI
53AQI
59AQI
59AQI
58AQI
59AQI
50AQI
40AQI
38AQI
42AQI
47AQI
52AQI
54AQI
53AQI
52AQI
49AQI
55AQI
50AQI
43AQI
40AQI
42AQI
41AQI
43AQI
48AQI
39AQI
36AQI
41AQI
41AQI
37AQI
32AQI
31AQI
30AQI
34AQI
40AQI
43AQI
44AQI
42AQI
36AQI
37AQI
42AQI
37AQI
30AQI
28AQI
26AQI
23AQI
22AQI
22AQI
27AQI
31AQI
34AQI
29AQI
27AQI
25AQI
26AQI
33AQI
25AQI
28AQI
31AQI
39AQI
34AQI
36AQI
33AQI
30AQI
32AQI
48AQI
58AQI
57AQI
59AQI
57AQI
55AQI
56AQI
53AQI
48AQI
36AQI
34AQI
32AQI
33AQI
34AQI
37AQI
46AQI
39AQI
33AQI
26AQI
22AQI
22AQI
25AQI
24AQI
30AQI
28AQI
26AQI
28AQI
28AQI
26AQI
23AQI
24AQI
29AQI
28AQI
27AQI
23AQI
24AQI
25AQI
27AQI
34AQI
45AQI
40AQI
26AQI
21AQI
20AQI
21AQI
23AQI
24AQI
16AQI
26AQI
37AQI
32AQI
45AQI
55AQI
59AQI
58AQI
47AQI
51AQI
58AQI
58AQI
47AQI
50AQI
50AQI
36AQI
40AQI
32AQI
31AQI
33AQI
45AQI
34AQI
39AQI
27AQI
53AQI
No. of days
202536AQI
Highest AQI recorded in
October53AQI
Lowest AQI recorded in
September27AQI
202418AQI
Highest AQI recorded in
December38AQI
Lowest AQI recorded in
March10AQI
202314AQI
Highest AQI recorded in
September19AQI
Lowest AQI recorded in
December7AQI
202235AQI
Highest AQI recorded in
July51AQI
Lowest AQI recorded in
December11AQI
202140AQI
Highest AQI recorded in
October50AQI
Lowest AQI recorded in
January35AQI
202036AQI
Highest AQI recorded in
March53AQI
Lowest AQI recorded in
December29AQI
Most & Least Polluted Years Over the Last 6 Years
Zierbena's annual 2025 AQI (36) shows an average percentage change of 46.6% (worsened AQI) compared to previous years: 2020 (36), 2021 (40), 2022 (35), 2023 (14), 2024 (18).