Vallejo, 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
Vallejo, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (22nd October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 1st highest AQI at 44 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 22nd Oct - 23rd Oct 2025
Vallejo, California, United States
7 AM22nd Oct 2025
6 PM
6 AM23rd Oct 2025
55AQI
28AQI
52AQI
41AQI
In the last 24 hours,
Vallejo's AQI reached its highest point of 55 at 2 PM during the Day, while the lowest point, 28, was recorded at 4 PM during the Day between 22nd Oct and 23rd Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Vallejo, California, United States
24°C16/37°C
21°C17/29°C
20°C16/28°C
20°C14/29°C
17°C14/21°C
18°C16/21°C
19°C17/24°C
19°C17/22°C
19°C16/22°C
18°C15/22°C
17°C14/23°C
18°C13/27°C
19°C13/29°C
21°C12/32°C
21°C13/32°C
17°C15/21°C
17°C15/20°C
17°C11/24°C
16°C11/24°C
16°C10/25°C
13°C11/18°C
13°C10/16°C
14°C12/18°C
15°C9/22°C
17°C9/26°C
19°C12/29°C
17°C12/24°C
20°C12/30°C
18°C12/29°C
16°C14/22°C
--°C/°C
48AQI
42AQI
49AQI
46AQI
2025 Days Vs Air Quality
Vallejo, California, United States
92%
272
8%
23
Total number of days with different AQI categories in last 296 days in 2025 (69 days remaining)
Under WHO’s Safe Air Quality Limits: 92%
Health Risk Level:
Very Low
In 2025, 92% of 296 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
Vallejo, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
88AQI
43AQI
41AQI
35AQI
40AQI
40AQI
30AQI
27AQI
42AQI
50AQI
33AQI
27AQI
33AQI
37AQI
49AQI
51AQI
46AQI
43AQI
53AQI
33AQI
45AQI
53AQI
45AQI
61AQI
45AQI
38AQI
40AQI
42AQI
34AQI
37AQI
37AQI
40AQI
24AQI
24AQI
24AQI
28AQI
26AQI
28AQI
27AQI
34AQI
32AQI
34AQI
26AQI
28AQI
30AQI
27AQI
26AQI
22AQI
24AQI
25AQI
28AQI
30AQI
30AQI
22AQI
21AQI
22AQI
30AQI
36AQI
43AQI
31AQI
29AQI
26AQI
25AQI
27AQI
30AQI
33AQI
34AQI
44AQI
28AQI
32AQI
30AQI
21AQI
19AQI
49AQI
34AQI
16AQI
19AQI
22AQI
16AQI
21AQI
20AQI
23AQI
21AQI
27AQI
23AQI
22AQI
25AQI
23AQI
25AQI
31AQI
26AQI
23AQI
24AQI
30AQI
32AQI
30AQI
26AQI
27AQI
30AQI
22AQI
21AQI
30AQI
36AQI
38AQI
46AQI
46AQI
39AQI
33AQI
39AQI
34AQI
44AQI
44AQI
52AQI
40AQI
24AQI
21AQI
29AQI
37AQI
44AQI
44AQI
47AQI
35AQI
26AQI
30AQI
30AQI
45AQI
49AQI
33AQI
38AQI
32AQI
29AQI
24AQI
20AQI
35AQI
44AQI
48AQI
30AQI
28AQI
27AQI
25AQI
42AQI
36AQI
30AQI
37AQI
25AQI
19AQI
30AQI
25AQI
20AQI
31AQI
49AQI
53AQI
53AQI
51AQI
55AQI
42AQI
20AQI
25AQI
18AQI
22AQI
24AQI
42AQI
50AQI
51AQI
49AQI
51AQI
44AQI
38AQI
34AQI
46AQI
42AQI
37AQI
34AQI
40AQI
31AQI
26AQI
31AQI
37AQI
37AQI
31AQI
23AQI
27AQI
23AQI
41AQI
37AQI
37AQI
35AQI
25AQI
22AQI
18AQI
26AQI
35AQI
37AQI
30AQI
21AQI
20AQI
22AQI
19AQI
20AQI
20AQI
25AQI
28AQI
17AQI
16AQI
15AQI
16AQI
17AQI
18AQI
22AQI
30AQI
27AQI
26AQI
26AQI
25AQI
39AQI
38AQI
36AQI
37AQI
34AQI
41AQI
37AQI
30AQI
27AQI
27AQI
27AQI
21AQI
44AQI
19AQI
17AQI
20AQI
24AQI
34AQI
46AQI
50AQI
35AQI
25AQI
29AQI
38AQI
42AQI
38AQI
26AQI
32AQI
38AQI
38AQI
44AQI
33AQI
28AQI
23AQI
29AQI
27AQI
21AQI
16AQI
17AQI
34AQI
36AQI
38AQI
24AQI
26AQI
36AQI
35AQI
41AQI
39AQI
41AQI
35AQI
34AQI
40AQI
48AQI
43AQI
48AQI
60AQI
49AQI
28AQI
22AQI
27AQI
38AQI
45AQI
50AQI
51AQI
51AQI
48AQI
52AQI
47AQI
50AQI
44AQI
43AQI
54AQI
36AQI
45AQI
51AQI
53AQI
60AQI
64AQI
51AQI
51AQI
44AQI
43AQI
28AQI
27AQI
34AQI
33AQI
38AQI
25AQI
32AQI
34AQI
48AQI
No. of days
202534AQI
Highest AQI recorded in
October48AQI
Lowest AQI recorded in
July25AQI
202430AQI
Highest AQI recorded in
December46AQI
Lowest AQI recorded in
January19AQI
202322AQI
Highest AQI recorded in
April31AQI
Lowest AQI recorded in
July16AQI
202234AQI
Highest AQI recorded in
January50AQI
Lowest AQI recorded in
July21AQI
202137AQI
Highest AQI recorded in
January47AQI
Lowest AQI recorded in
June26AQI
202045AQI
Highest AQI recorded in
September71AQI
Lowest AQI recorded in
June30AQI
Most & Least Polluted Years Over the Last 6 Years
Vallejo's annual 2025 AQI (34) shows an average percentage change of 6.1% (worsened AQI) compared to previous years: 2020 (45), 2021 (37), 2022 (34), 2023 (22), 2024 (30).