Leon I, Leon, Castille Leon, 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
Leon I, Leon, Castille Leon, Spain
AQI Trends: Highest and Lowest
Same Day Analysis (18th 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: 18th Oct - 19th Oct 2025
Leon I, Leon, Castille Leon, Spain
8 AM18th Oct 2025
8 PM
7 AM19th Oct 2025
54AQI
42AQI
72AQI
50AQI
In the last 24 hours,
Leon I's AQI reached its highest point of 72 at 4 AM during the Night, while the lowest point, 42, was recorded at 10 AM during the Day between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Leon I, Leon, Castille Leon, Spain
23°C16/31°C
19°C11/27°C
12°C6/19°C
9°C5/15°C
11°C6/19°C
9°C3/17°C
11°C4/20°C
14°C6/24°C
15°C8/23°C
15°C11/23°C
14°C9/22°C
15°C8/23°C
16°C9/25°C
17°C10/26°C
18°C12/26°C
16°C10/24°C
11°C5/21°C
13°C5/22°C
16°C9/25°C
16°C12/24°C
14°C9/20°C
13°C7/22°C
14°C9/22°C
16°C11/22°C
17°C14/22°C
16°C10/23°C
16°C11/23°C
16°C11/23°C
15°C10/23°C
15°C9/23°C
--°C/°C
38AQI
31AQI
38AQI
36AQI
2025 Days Vs Air Quality
Leon I, Leon, Castille Leon, Spain
87%
254
13%
37
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 292 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
Leon I, Leon, Castille Leon, Spain
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
72AQI
67AQI
73AQI
66AQI
31AQI
27AQI
25AQI
35AQI
32AQI
39AQI
28AQI
33AQI
40AQI
48AQI
58AQI
51AQI
40AQI
43AQI
55AQI
46AQI
35AQI
30AQI
33AQI
31AQI
29AQI
33AQI
28AQI
28AQI
28AQI
29AQI
35AQI
42AQI
40AQI
28AQI
37AQI
51AQI
62AQI
54AQI
32AQI
40AQI
50AQI
45AQI
29AQI
32AQI
39AQI
26AQI
51AQI
42AQI
49AQI
56AQI
55AQI
39AQI
26AQI
35AQI
41AQI
39AQI
37AQI
39AQI
34AQI
28AQI
27AQI
26AQI
33AQI
32AQI
29AQI
25AQI
31AQI
32AQI
31AQI
27AQI
24AQI
22AQI
22AQI
24AQI
20AQI
28AQI
22AQI
26AQI
28AQI
21AQI
17AQI
19AQI
24AQI
22AQI
25AQI
31AQI
34AQI
21AQI
23AQI
25AQI
25AQI
39AQI
19AQI
24AQI
15AQI
16AQI
27AQI
40AQI
27AQI
34AQI
36AQI
28AQI
18AQI
18AQI
10AQI
14AQI
17AQI
15AQI
11AQI
14AQI
18AQI
19AQI
18AQI
20AQI
22AQI
15AQI
18AQI
18AQI
21AQI
19AQI
18AQI
23AQI
25AQI
26AQI
24AQI
18AQI
19AQI
25AQI
21AQI
16AQI
21AQI
21AQI
18AQI
17AQI
18AQI
19AQI
23AQI
25AQI
17AQI
20AQI
29AQI
17AQI
19AQI
21AQI
24AQI
20AQI
24AQI
27AQI
30AQI
41AQI
43AQI
53AQI
21AQI
26AQI
21AQI
19AQI
20AQI
19AQI
44AQI
56AQI
58AQI
49AQI
51AQI
41AQI
33AQI
28AQI
31AQI
45AQI
50AQI
53AQI
52AQI
52AQI
52AQI
53AQI
52AQI
47AQI
39AQI
37AQI
41AQI
40AQI
42AQI
42AQI
45AQI
36AQI
38AQI
35AQI
34AQI
26AQI
22AQI
22AQI
26AQI
33AQI
32AQI
33AQI
35AQI
32AQI
35AQI
38AQI
32AQI
22AQI
22AQI
19AQI
20AQI
22AQI
20AQI
20AQI
29AQI
30AQI
32AQI
23AQI
21AQI
22AQI
32AQI
32AQI
34AQI
38AQI
45AQI
40AQI
57AQI
60AQI
57AQI
59AQI
59AQI
66AQI
62AQI
60AQI
61AQI
64AQI
69AQI
63AQI
58AQI
38AQI
37AQI
34AQI
35AQI
44AQI
47AQI
49AQI
45AQI
32AQI
24AQI
20AQI
19AQI
20AQI
20AQI
24AQI
22AQI
27AQI
32AQI
34AQI
26AQI
22AQI
21AQI
22AQI
20AQI
23AQI
21AQI
21AQI
18AQI
27AQI
34AQI
42AQI
53AQI
25AQI
16AQI
14AQI
16AQI
24AQI
28AQI
19AQI
18AQI
28AQI
31AQI
35AQI
44AQI
44AQI
41AQI
25AQI
33AQI
39AQI
44AQI
43AQI
43AQI
44AQI
50AQI
44AQI
44AQI
47AQI
46AQI
43AQI
50AQI
40AQI
41AQI
26AQI
21AQI
23AQI
41AQI
29AQI
46AQI
25AQI
42AQI
No. of days
202533AQI
Highest AQI recorded in
August46AQI
Lowest AQI recorded in
April21AQI
202439AQI
Highest AQI recorded in
January56AQI
Lowest AQI recorded in
October29AQI
202341AQI
Highest AQI recorded in
September71AQI
Lowest AQI recorded in
July30AQI
202239AQI
Highest AQI recorded in
July55AQI
Lowest AQI recorded in
September30AQI
202130AQI
Highest AQI recorded in
November43AQI
Lowest AQI recorded in
October24AQI
202026AQI
Highest AQI recorded in
March34AQI
Lowest AQI recorded in
December21AQI
Most & Least Polluted Years Over the Last 6 Years
Leon I's annual 2025 AQI (33) shows an average percentage change of -2.7% (improved AQI) compared to previous years: 2020 (26), 2021 (30), 2022 (39), 2023 (41), 2024 (39).