Castro Urdiales, Cantabria, Spain Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Castro Urdiales, Cantabria, Spain
AQI Trends: Highest and Lowest
Same Day Analysis (20th August ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 37 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Aug - 22nd Aug 2025
Castro Urdiales, Cantabria, Spain
7 AM21st Aug 2025
9 PM
6 AM22nd Aug 2025
40AQI
33AQI
35AQI
34AQI
In the last 24 hours,
Castro Urdiales's AQI reached its highest point of 40 at 8 PM during the Day, while the lowest point, undefined, was recorded at 6 AM during the Night between 21st Aug and 22nd Aug 2025.
Day & Night AQI Trend : Jul - Aug 2025
Castro Urdiales, Cantabria, Spain
16°C11/22°C
14°C10/18°C
15°C10/21°C
16°C10/25°C
17°C10/25°C
16°C10/20°C
16°C11/21°C
17°C10/23°C
17°C10/26°C
16°C11/24°C
17°C11/25°C
18°C11/28°C
23°C13/35°C
19°C13/25°C
21°C14/32°C
24°C16/36°C
24°C15/36°C
23°C15/33°C
25°C14/38°C
27°C19/37°C
27°C19/38°C
23°C17/33°C
24°C16/36°C
29°C21/37°C
28°C18/39°C
27°C18/39°C
18°C13/23°C
16°C12/21°C
16°C12/22°C
15°C11/20°C
--°C/°C
38AQI
38AQI
37AQI
37AQI
2025 Days Vs Air Quality
Castro Urdiales, Cantabria, Spain
95%
220
5%
12
Total number of days with different AQI categories in last 234 days in 2025 (131 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2025, 95% of 234 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
Castro Urdiales, Cantabria, Spain
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
44AQI
43AQI
43AQI
41AQI
36AQI
33AQI
29AQI
28AQI
28AQI
25AQI
28AQI
29AQI
34AQI
47AQI
49AQI
49AQI
48AQI
47AQI
47AQI
45AQI
40AQI
35AQI
31AQI
31AQI
30AQI
29AQI
31AQI
30AQI
31AQI
31AQI
30AQI
29AQI
29AQI
29AQI
32AQI
34AQI
37AQI
38AQI
34AQI
33AQI
33AQI
36AQI
33AQI
31AQI
31AQI
29AQI
37AQI
36AQI
41AQI
44AQI
44AQI
43AQI
39AQI
35AQI
32AQI
29AQI
27AQI
31AQI
32AQI
32AQI
30AQI
34AQI
38AQI
41AQI
37AQI
34AQI
32AQI
32AQI
29AQI
28AQI
29AQI
26AQI
25AQI
26AQI
26AQI
27AQI
26AQI
27AQI
30AQI
26AQI
24AQI
23AQI
24AQI
27AQI
29AQI
30AQI
29AQI
28AQI
28AQI
29AQI
31AQI
32AQI
28AQI
29AQI
24AQI
21AQI
20AQI
23AQI
26AQI
27AQI
36AQI
35AQI
30AQI
31AQI
23AQI
18AQI
22AQI
17AQI
17AQI
14AQI
17AQI
17AQI
20AQI
20AQI
22AQI
21AQI
21AQI
24AQI
24AQI
24AQI
26AQI
28AQI
24AQI
24AQI
23AQI
22AQI
24AQI
26AQI
29AQI
26AQI
24AQI
25AQI
25AQI
25AQI
24AQI
28AQI
35AQI
35AQI
31AQI
30AQI
30AQI
26AQI
27AQI
26AQI
26AQI
24AQI
24AQI
26AQI
28AQI
33AQI
33AQI
28AQI
26AQI
29AQI
29AQI
28AQI
27AQI
25AQI
44AQI
55AQI
54AQI
53AQI
54AQI
54AQI
48AQI
40AQI
35AQI
39AQI
42AQI
46AQI
49AQI
49AQI
48AQI
47AQI
48AQI
47AQI
41AQI
37AQI
36AQI
35AQI
36AQI
39AQI
36AQI
33AQI
34AQI
35AQI
34AQI
30AQI
28AQI
28AQI
31AQI
34AQI
36AQI
37AQI
36AQI
33AQI
34AQI
37AQI
34AQI
28AQI
26AQI
24AQI
22AQI
21AQI
22AQI
27AQI
31AQI
34AQI
26AQI
26AQI
25AQI
23AQI
26AQI
25AQI
28AQI
31AQI
36AQI
34AQI
39AQI
39AQI
37AQI
37AQI
49AQI
57AQI
57AQI
56AQI
56AQI
55AQI
56AQI
53AQI
50AQI
37AQI
36AQI
34AQI
29AQI
24AQI
27AQI
41AQI
30AQI
43AQI
No. of days
202533AQI
Highest AQI recorded in
August43AQI
Lowest AQI recorded in
April24AQI
202429AQI
Highest AQI recorded in
December35AQI
Lowest AQI recorded in
January19AQI
202324AQI
Highest AQI recorded in
May30AQI
Lowest AQI recorded in
December18AQI
202226AQI
Highest AQI recorded in
March35AQI
Lowest AQI recorded in
January18AQI
202123AQI
Highest AQI recorded in
June27AQI
Lowest AQI recorded in
December18AQI
202025AQI
Highest AQI recorded in
May31AQI
Lowest AQI recorded in
November20AQI
Most & Least Polluted Years Over the Last 6 Years
Castro Urdiales's annual 2025 AQI (33) shows an average percentage change of 28.7% (worsened AQI) compared to previous years: 2020 (25), 2021 (23), 2022 (26), 2023 (24), 2024 (29).