Usurbil, Donostia, Basque Country, Spain 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
Usurbil, Donostia, Basque Country, Spain
AQI Trends: Highest and Lowest
Same Day Analysis (29th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 40 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 29th Sep - 30th Sep 2025
Usurbil, Donostia, Basque Country, Spain
7 AM29th Sep 2025
8 PM
6 AM30th Sep 2025
48AQI
18AQI
55AQI
16AQI
In the last 24 hours,
Usurbil's AQI reached its highest point of 55 at 5 AM during the Night, while the lowest point, 16, was recorded at 8 PM during the Night between 29th Sep and 30th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Usurbil, Donostia, Basque Country, Spain
18°C15/22°C
17°C14/21°C
19°C14/25°C
20°C16/29°C
18°C15/21°C
19°C15/23°C
25°C18/32°C
22°C18/29°C
17°C16/17°C
16°C14/19°C
17°C15/19°C
18°C15/23°C
18°C17/20°C
17°C15/22°C
20°C15/25°C
18°C17/21°C
18°C16/22°C
19°C16/25°C
21°C15/29°C
25°C20/33°C
21°C17/27°C
14°C13/16°C
14°C12/16°C
13°C11/15°C
13°C11/17°C
14°C12/17°C
14°C11/19°C
18°C11/24°C
19°C15/22°C
17°C14/20°C
--°C/°C
29AQI
26AQI
29AQI
27AQI
2025 Days Vs Air Quality
Usurbil, Donostia, Basque Country, Spain
86%
234
14%
38
Total number of days with different AQI categories in last 273 days in 2025 (92 days remaining)
Under WHO’s Safe Air Quality Limits: 86%
Health Risk Level:
Low
In 2025, 86% of 273 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
Usurbil, Donostia, Basque Country, Spain
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
40AQI
31AQI
37AQI
25AQI
25AQI
33AQI
32AQI
27AQI
33AQI
26AQI
33AQI
33AQI
54AQI
56AQI
70AQI
68AQI
65AQI
84AQI
48AQI
34AQI
28AQI
25AQI
33AQI
33AQI
28AQI
28AQI
35AQI
32AQI
29AQI
33AQI
37AQI
37AQI
36AQI
32AQI
52AQI
54AQI
64AQI
49AQI
38AQI
34AQI
27AQI
33AQI
37AQI
37AQI
42AQI
41AQI
38AQI
47AQI
44AQI
50AQI
49AQI
47AQI
33AQI
39AQI
31AQI
33AQI
38AQI
46AQI
57AQI
37AQI
28AQI
35AQI
40AQI
35AQI
31AQI
32AQI
32AQI
32AQI
31AQI
28AQI
35AQI
33AQI
37AQI
40AQI
41AQI
35AQI
26AQI
17AQI
40AQI
55AQI
19AQI
22AQI
35AQI
40AQI
49AQI
51AQI
37AQI
36AQI
38AQI
50AQI
56AQI
53AQI
28AQI
26AQI
24AQI
28AQI
27AQI
49AQI
61AQI
53AQI
43AQI
38AQI
38AQI
32AQI
23AQI
19AQI
19AQI
19AQI
16AQI
18AQI
24AQI
24AQI
29AQI
22AQI
30AQI
29AQI
27AQI
31AQI
26AQI
24AQI
35AQI
50AQI
41AQI
34AQI
31AQI
29AQI
35AQI
38AQI
48AQI
31AQI
28AQI
32AQI
30AQI
33AQI
30AQI
49AQI
49AQI
46AQI
46AQI
44AQI
41AQI
28AQI
33AQI
32AQI
32AQI
26AQI
30AQI
38AQI
37AQI
52AQI
41AQI
21AQI
24AQI
40AQI
30AQI
24AQI
28AQI
26AQI
43AQI
61AQI
65AQI
63AQI
54AQI
60AQI
49AQI
36AQI
33AQI
40AQI
46AQI
54AQI
57AQI
55AQI
53AQI
48AQI
54AQI
53AQI
46AQI
40AQI
37AQI
35AQI
40AQI
51AQI
38AQI
32AQI
38AQI
39AQI
37AQI
30AQI
31AQI
32AQI
40AQI
49AQI
48AQI
43AQI
43AQI
34AQI
41AQI
45AQI
42AQI
32AQI
26AQI
29AQI
26AQI
27AQI
21AQI
44AQI
51AQI
45AQI
28AQI
30AQI
29AQI
25AQI
26AQI
24AQI
28AQI
33AQI
37AQI
29AQI
37AQI
36AQI
29AQI
35AQI
52AQI
58AQI
59AQI
59AQI
57AQI
55AQI
56AQI
52AQI
49AQI
38AQI
37AQI
34AQI
32AQI
34AQI
41AQI
45AQI
35AQI
31AQI
26AQI
22AQI
21AQI
23AQI
22AQI
27AQI
33AQI
25AQI
25AQI
31AQI
24AQI
23AQI
23AQI
28AQI
26AQI
26AQI
23AQI
22AQI
22AQI
28AQI
38AQI
47AQI
38AQI
19AQI
19AQI
21AQI
24AQI
24AQI
37AQI
34AQI
40AQI
40AQI
39AQI
42AQI
35AQI
31AQI
37AQI
44AQI
36AQI
39AQI
28AQI
No. of days
202537AQI
Highest AQI recorded in
June44AQI
Lowest AQI recorded in
September28AQI
202435AQI
Highest AQI recorded in
January42AQI
Lowest AQI recorded in
October31AQI
202340AQI
Highest AQI recorded in
February58AQI
Lowest AQI recorded in
August31AQI
202239AQI
Highest AQI recorded in
January48AQI
Lowest AQI recorded in
November32AQI
202136AQI
Highest AQI recorded in
March46AQI
Lowest AQI recorded in
July28AQI
202033AQI
Highest AQI recorded in
November38AQI
Lowest AQI recorded in
June25AQI
Most & Least Polluted Years Over the Last 6 Years
Usurbil's annual 2025 AQI (37) shows an average percentage change of 1.6% (worsened AQI) compared to previous years: 2020 (33), 2021 (36), 2022 (39), 2023 (40), 2024 (35).