Alameda, California, United States 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
Alameda, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (25th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 23 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 25th Oct - 26th Oct 2025
Alameda, California, United States
7 AM25th Oct 2025
6 PM
6 AM26th Oct 2025
55AQI
11AQI
44AQI
11AQI
In the last 24 hours,
Alameda's AQI reached its highest point of 55 at 2 PM during the Day, while the lowest point, undefined, was recorded at 6 AM during the Night between 25th Oct and 26th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Alameda, California, United States
19°C14/27°C
17°C13/22°C
18°C16/22°C
19°C17/22°C
19°C17/24°C
19°C17/23°C
18°C16/21°C
17°C14/22°C
18°C13/24°C
18°C12/25°C
21°C13/32°C
19°C14/27°C
17°C15/21°C
17°C15/21°C
17°C12/23°C
16°C12/21°C
16°C11/23°C
13°C10/18°C
13°C10/19°C
14°C12/17°C
14°C9/21°C
16°C10/23°C
18°C12/28°C
16°C13/21°C
19°C11/30°C
17°C12/23°C
15°C13/18°C
14°C11/20°C
15°C13/19°C
15°C13/18°C
--°C/°C
50AQI
40AQI
47AQI
40AQI
2025 Days Vs Air Quality
Alameda, California, United States
88%
262
12%
36
Total number of days with different AQI categories in last 299 days in 2025 (66 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2025, 88% of 299 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
Alameda, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
56AQI
52AQI
48AQI
41AQI
48AQI
50AQI
26AQI
28AQI
47AQI
43AQI
31AQI
26AQI
33AQI
39AQI
55AQI
63AQI
50AQI
50AQI
58AQI
38AQI
43AQI
55AQI
54AQI
63AQI
51AQI
40AQI
44AQI
46AQI
39AQI
36AQI
37AQI
34AQI
23AQI
22AQI
21AQI
24AQI
28AQI
23AQI
24AQI
28AQI
31AQI
32AQI
24AQI
26AQI
35AQI
39AQI
42AQI
23AQI
29AQI
35AQI
28AQI
34AQI
39AQI
32AQI
25AQI
26AQI
40AQI
41AQI
56AQI
32AQI
25AQI
22AQI
23AQI
26AQI
23AQI
32AQI
39AQI
39AQI
32AQI
31AQI
25AQI
21AQI
25AQI
58AQI
43AQI
19AQI
19AQI
24AQI
18AQI
30AQI
26AQI
34AQI
26AQI
40AQI
24AQI
22AQI
28AQI
18AQI
19AQI
22AQI
24AQI
21AQI
25AQI
27AQI
28AQI
25AQI
18AQI
18AQI
24AQI
24AQI
24AQI
36AQI
47AQI
40AQI
33AQI
38AQI
23AQI
31AQI
34AQI
36AQI
46AQI
41AQI
51AQI
37AQI
22AQI
17AQI
30AQI
40AQI
42AQI
47AQI
44AQI
31AQI
28AQI
45AQI
35AQI
51AQI
48AQI
32AQI
45AQI
39AQI
31AQI
23AQI
23AQI
43AQI
46AQI
50AQI
32AQI
37AQI
41AQI
27AQI
35AQI
32AQI
31AQI
40AQI
25AQI
20AQI
38AQI
33AQI
29AQI
40AQI
53AQI
54AQI
49AQI
42AQI
54AQI
39AQI
31AQI
27AQI
22AQI
21AQI
27AQI
50AQI
53AQI
51AQI
52AQI
53AQI
50AQI
44AQI
43AQI
51AQI
50AQI
44AQI
44AQI
45AQI
29AQI
26AQI
31AQI
39AQI
39AQI
38AQI
32AQI
26AQI
25AQI
38AQI
38AQI
38AQI
35AQI
29AQI
24AQI
20AQI
26AQI
35AQI
36AQI
30AQI
23AQI
20AQI
23AQI
19AQI
20AQI
23AQI
22AQI
25AQI
18AQI
18AQI
17AQI
15AQI
15AQI
16AQI
19AQI
24AQI
26AQI
25AQI
22AQI
22AQI
42AQI
43AQI
34AQI
42AQI
29AQI
39AQI
36AQI
31AQI
29AQI
29AQI
22AQI
21AQI
42AQI
19AQI
18AQI
22AQI
29AQI
35AQI
51AQI
50AQI
32AQI
28AQI
29AQI
34AQI
45AQI
37AQI
27AQI
34AQI
46AQI
38AQI
44AQI
30AQI
26AQI
23AQI
26AQI
30AQI
23AQI
19AQI
20AQI
35AQI
35AQI
31AQI
29AQI
26AQI
33AQI
29AQI
36AQI
40AQI
42AQI
35AQI
35AQI
40AQI
47AQI
48AQI
54AQI
56AQI
48AQI
26AQI
18AQI
26AQI
35AQI
44AQI
51AQI
54AQI
51AQI
51AQI
49AQI
52AQI
47AQI
47AQI
46AQI
52AQI
34AQI
45AQI
49AQI
52AQI
57AQI
60AQI
52AQI
54AQI
43AQI
51AQI
24AQI
23AQI
45AQI
31AQI
28AQI
32AQI
36AQI
41AQI
25AQI
33AQI
34AQI
46AQI
No. of days
202535AQI
Highest AQI recorded in
October46AQI
Lowest AQI recorded in
July25AQI
202433AQI
Highest AQI recorded in
December51AQI
Lowest AQI recorded in
March25AQI
202335AQI
Highest AQI recorded in
December45AQI
Lowest AQI recorded in
March25AQI
202238AQI
Highest AQI recorded in
August49AQI
Lowest AQI recorded in
July27AQI
202134AQI
Highest AQI recorded in
September43AQI
Lowest AQI recorded in
February25AQI
202041AQI
Highest AQI recorded in
September70AQI
Lowest AQI recorded in
June27AQI
Most & Least Polluted Years Over the Last 6 Years
Alameda's annual 2025 AQI (35) shows an average percentage change of -2.5% (improved AQI) compared to previous years: 2020 (41), 2021 (34), 2022 (38), 2023 (35), 2024 (33).