Leon Iv, 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 Iv, 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 Iv, Leon, Castille Leon, Spain
8 AM18th Oct 2025
8 PM
7 AM19th Oct 2025
54AQI
42AQI
75AQI
46AQI
In the last 24 hours,
Leon Iv's AQI reached its highest point of 75 at 3 AM during the Night, while the lowest point, 42, was recorded at 8 AM during the Day between 18th Oct and 19th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Leon Iv, 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
41AQI
35AQI
2025 Days Vs Air Quality
Leon Iv, Leon, Castille Leon, Spain
88%
256
12%
35
Total number of days with different AQI categories in last 292 days in 2025 (73 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% 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 Iv, Leon, Castille Leon, Spain
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
71AQI
68AQI
75AQI
67AQI
32AQI
27AQI
25AQI
31AQI
30AQI
38AQI
29AQI
33AQI
41AQI
49AQI
57AQI
52AQI
40AQI
43AQI
53AQI
47AQI
36AQI
30AQI
32AQI
31AQI
28AQI
32AQI
28AQI
28AQI
28AQI
29AQI
34AQI
41AQI
41AQI
27AQI
36AQI
52AQI
61AQI
55AQI
33AQI
42AQI
51AQI
46AQI
30AQI
33AQI
39AQI
26AQI
50AQI
42AQI
49AQI
56AQI
55AQI
40AQI
25AQI
34AQI
41AQI
39AQI
36AQI
37AQI
33AQI
30AQI
26AQI
25AQI
31AQI
32AQI
29AQI
25AQI
31AQI
31AQI
31AQI
28AQI
25AQI
22AQI
22AQI
24AQI
20AQI
30AQI
22AQI
26AQI
30AQI
20AQI
18AQI
19AQI
24AQI
23AQI
26AQI
33AQI
32AQI
22AQI
22AQI
25AQI
25AQI
39AQI
19AQI
24AQI
16AQI
17AQI
27AQI
40AQI
27AQI
35AQI
37AQI
29AQI
18AQI
19AQI
10AQI
13AQI
17AQI
15AQI
11AQI
14AQI
17AQI
18AQI
18AQI
20AQI
22AQI
15AQI
18AQI
18AQI
20AQI
20AQI
18AQI
23AQI
24AQI
25AQI
24AQI
18AQI
20AQI
25AQI
22AQI
16AQI
21AQI
23AQI
19AQI
18AQI
18AQI
20AQI
23AQI
25AQI
18AQI
21AQI
30AQI
17AQI
19AQI
21AQI
25AQI
20AQI
25AQI
27AQI
31AQI
41AQI
44AQI
53AQI
22AQI
26AQI
21AQI
19AQI
20AQI
19AQI
45AQI
57AQI
58AQI
47AQI
52AQI
40AQI
32AQI
28AQI
34AQI
47AQI
51AQI
53AQI
51AQI
50AQI
49AQI
53AQI
49AQI
46AQI
38AQI
38AQI
42AQI
40AQI
43AQI
43AQI
46AQI
39AQI
39AQI
35AQI
33AQI
23AQI
21AQI
22AQI
28AQI
37AQI
32AQI
34AQI
37AQI
33AQI
36AQI
39AQI
30AQI
22AQI
22AQI
18AQI
20AQI
22AQI
20AQI
20AQI
29AQI
30AQI
33AQI
23AQI
21AQI
22AQI
32AQI
33AQI
34AQI
37AQI
44AQI
40AQI
57AQI
60AQI
58AQI
59AQI
59AQI
66AQI
63AQI
60AQI
61AQI
65AQI
70AQI
64AQI
56AQI
38AQI
37AQI
37AQI
35AQI
43AQI
47AQI
49AQI
46AQI
32AQI
24AQI
21AQI
19AQI
20AQI
20AQI
24AQI
22AQI
27AQI
31AQI
34AQI
27AQI
22AQI
21AQI
22AQI
20AQI
22AQI
21AQI
21AQI
18AQI
27AQI
33AQI
42AQI
53AQI
26AQI
16AQI
15AQI
17AQI
24AQI
28AQI
21AQI
19AQI
28AQI
30AQI
34AQI
45AQI
45AQI
43AQI
25AQI
34AQI
41AQI
45AQI
45AQI
43AQI
44AQI
49AQI
44AQI
43AQI
46AQI
47AQI
42AQI
50AQI
40AQI
41AQI
26AQI
21AQI
23AQI
41AQI
29AQI
47AQI
25AQI
43AQI
No. of days
202533AQI
Highest AQI recorded in
August47AQI
Lowest AQI recorded in
April21AQI
202438AQI
Highest AQI recorded in
January54AQI
Lowest AQI recorded in
October29AQI
202338AQI
Highest AQI recorded in
December53AQI
Lowest AQI recorded in
July31AQI
202240AQI
Highest AQI recorded in
July57AQI
Lowest AQI recorded in
September30AQI
202129AQI
Highest AQI recorded in
November43AQI
Lowest AQI recorded in
October19AQI
202027AQI
Highest AQI recorded in
July41AQI
Lowest AQI recorded in
December19AQI
Most & Least Polluted Years Over the Last 6 Years
Leon Iv's annual 2025 AQI (33) shows an average percentage change of -1.3% (improved AQI) compared to previous years: 2020 (27), 2021 (29), 2022 (40), 2023 (38), 2024 (38).