Thousand Oaks, 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
Thousand Oaks, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (20th 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: 20th Oct - 21st Oct 2025
Thousand Oaks, California, United States
6 AM20th Oct 2025
6 PM
5 AM21st Oct 2025
56AQI
19AQI
61AQI
31AQI
In the last 24 hours,
Thousand Oaks's AQI reached its highest point of 61 at 2 AM during the Night, while the lowest point, 19, was recorded at 2 PM during the Day between 20th Oct and 21st Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Thousand Oaks, California, United States
23°C15/33°C
22°C14/34°C
24°C18/36°C
24°C18/33°C
21°C16/30°C
20°C16/24°C
20°C16/27°C
19°C15/25°C
19°C14/27°C
19°C14/26°C
20°C14/29°C
20°C14/30°C
20°C15/28°C
19°C12/28°C
19°C12/30°C
18°C11/28°C
19°C14/29°C
17°C13/24°C
18°C10/29°C
21°C12/34°C
21°C13/30°C
20°C14/31°C
16°C13/21°C
13°C11/16°C
13°C9/19°C
18°C11/29°C
21°C15/31°C
21°C15/32°C
20°C14/31°C
20°C13/30°C
--°C/°C
41AQI
35AQI
42AQI
40AQI
2025 Days Vs Air Quality
Thousand Oaks, California, United States
87%
256
13%
37
Total number of days with different AQI categories in last 294 days in 2025 (71 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 294 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
Thousand Oaks, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
52AQI
36AQI
43AQI
38AQI
31AQI
29AQI
32AQI
50AQI
41AQI
37AQI
43AQI
29AQI
31AQI
28AQI
32AQI
30AQI
37AQI
46AQI
48AQI
44AQI
32AQI
42AQI
33AQI
31AQI
39AQI
29AQI
27AQI
29AQI
43AQI
43AQI
41AQI
39AQI
42AQI
37AQI
27AQI
23AQI
23AQI
26AQI
29AQI
31AQI
31AQI
29AQI
26AQI
24AQI
30AQI
31AQI
28AQI
32AQI
35AQI
30AQI
35AQI
29AQI
29AQI
31AQI
33AQI
34AQI
35AQI
29AQI
29AQI
32AQI
35AQI
28AQI
29AQI
31AQI
30AQI
26AQI
30AQI
33AQI
33AQI
29AQI
26AQI
23AQI
21AQI
22AQI
36AQI
30AQI
20AQI
19AQI
19AQI
21AQI
28AQI
39AQI
35AQI
30AQI
24AQI
21AQI
25AQI
27AQI
23AQI
17AQI
19AQI
20AQI
26AQI
24AQI
18AQI
19AQI
32AQI
39AQI
39AQI
45AQI
45AQI
51AQI
49AQI
44AQI
42AQI
31AQI
27AQI
27AQI
31AQI
35AQI
43AQI
52AQI
40AQI
39AQI
32AQI
18AQI
16AQI
20AQI
26AQI
39AQI
44AQI
36AQI
34AQI
28AQI
39AQI
37AQI
33AQI
43AQI
42AQI
36AQI
45AQI
40AQI
20AQI
29AQI
44AQI
48AQI
42AQI
30AQI
39AQI
46AQI
46AQI
56AQI
53AQI
46AQI
44AQI
43AQI
39AQI
38AQI
42AQI
43AQI
45AQI
43AQI
36AQI
29AQI
29AQI
33AQI
32AQI
30AQI
41AQI
41AQI
46AQI
36AQI
49AQI
47AQI
48AQI
54AQI
58AQI
58AQI
56AQI
55AQI
53AQI
57AQI
58AQI
54AQI
44AQI
42AQI
46AQI
47AQI
47AQI
44AQI
33AQI
35AQI
42AQI
41AQI
47AQI
64AQI
52AQI
47AQI
36AQI
35AQI
42AQI
47AQI
54AQI
46AQI
33AQI
36AQI
29AQI
25AQI
24AQI
33AQI
42AQI
33AQI
24AQI
21AQI
19AQI
18AQI
21AQI
22AQI
23AQI
28AQI
41AQI
41AQI
42AQI
37AQI
53AQI
60AQI
68AQI
64AQI
60AQI
58AQI
54AQI
51AQI
47AQI
53AQI
53AQI
50AQI
44AQI
38AQI
40AQI
42AQI
44AQI
42AQI
50AQI
52AQI
55AQI
53AQI
48AQI
52AQI
47AQI
49AQI
38AQI
43AQI
49AQI
44AQI
44AQI
47AQI
40AQI
42AQI
42AQI
37AQI
32AQI
24AQI
25AQI
24AQI
30AQI
44AQI
49AQI
55AQI
53AQI
33AQI
34AQI
44AQI
38AQI
33AQI
30AQI
33AQI
37AQI
29AQI
36AQI
20AQI
22AQI
22AQI
33AQI
35AQI
35AQI
35AQI
46AQI
49AQI
46AQI
53AQI
52AQI
47AQI
47AQI
52AQI
45AQI
55AQI
39AQI
36AQI
39AQI
42AQI
43AQI
48AQI
50AQI
37AQI
31AQI
27AQI
33AQI
40AQI
45AQI
36AQI
50AQI
36AQI
45AQI
No. of days
202538AQI
Highest AQI recorded in
August50AQI
Lowest AQI recorded in
March27AQI
202435AQI
Highest AQI recorded in
December39AQI
Lowest AQI recorded in
February27AQI
202334AQI
Highest AQI recorded in
July42AQI
Lowest AQI recorded in
January30AQI
202238AQI
Highest AQI recorded in
August51AQI
Lowest AQI recorded in
December29AQI
202137AQI
Highest AQI recorded in
April41AQI
Lowest AQI recorded in
January30AQI
202039AQI
Highest AQI recorded in
September52AQI
Lowest AQI recorded in
April29AQI
Most & Least Polluted Years Over the Last 6 Years
Thousand Oaks's annual 2025 AQI (38) shows an average percentage change of 2.8% (worsened AQI) compared to previous years: 2020 (39), 2021 (37), 2022 (38), 2023 (34), 2024 (35).