Berkeley, 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
Berkeley, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (3rd October):
On this day, AQI across the 4 years varied significantly: 2026 ranks 3rd highest AQI at 46 of Good air quality, showing improvement over 2025 and 2024 on the same day.
Day & Night AQI Trend: 2nd Oct - 3rd Oct 2026
Berkeley, California, United States
6 AM2nd Oct 2026
7 PM
5 AM3rd Oct 2026
46AQI
25AQI
49AQI
26AQI
In the last 24 hours,
Berkeley's AQI reached its highest point of 49 at 2 AM during the Night, while the lowest point, 25, was recorded at 7 AM during the Day between 2nd Oct and 3rd Oct 2026.
Day & Night AQI Trend : Sep - Oct 2026
Berkeley, California, United States
17°C13/23°C
17°C12/23°C
16°C13/23°C
21°C13/31°C
23°C18/32°C
27°C21/36°C
22°C14/27°C
15°C14/18°C
17°C14/23°C
16°C14/20°C
17°C14/23°C
17°C14/22°C
16°C13/18°C
17°C15/20°C
17°C14/21°C
17°C14/21°C
16°C14/19°C
16°C14/19°C
16°C13/21°C
18°C13/24°C
19°C16/24°C
17°C14/20°C
15°C13/20°C
15°C13/18°C
15°C13/19°C
17°C13/23°C
19°C15/25°C
15°C11/21°C
17°C13/23°C
22°C15/30°C
55AQI
45AQI
49AQI
44AQI
2026 Days Vs Air Quality
Berkeley, California, United States
90%
246
10%
27
Total number of days with different AQI categories in last 276 days in 2026 (89 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2026, 90% of 276 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
Berkeley, California, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
17AQI (US)
13AQI (US)
16AQI (US)
14AQI (US)
21AQI (US)
13AQI (US)
21AQI (US)
17AQI (US)
16AQI (US)
32AQI (US)
51AQI (US)
44AQI (US)
55AQI (US)
48AQI (US)
66AQI (US)
52AQI (US)
56AQI (US)
61AQI (US)
41AQI (US)
40AQI (US)
49AQI (US)
46AQI (US)
50AQI (US)
47AQI (US)
43AQI (US)
45AQI (US)
42AQI (US)
47AQI (US)
53AQI (US)
50AQI (US)
39AQI (US)
44AQI (US)
47AQI (US)
46AQI (US)
44AQI (US)
46AQI (US)
42AQI (US)
35AQI (US)
41AQI (US)
45AQI (US)
47AQI (US)
46AQI (US)
47AQI (US)
51AQI (US)
50AQI (US)
42AQI (US)
46AQI (US)
51AQI (US)
43AQI (US)
44AQI (US)
40AQI (US)
36AQI (US)
36AQI (US)
38AQI (US)
43AQI (US)
43AQI (US)
35AQI (US)
31AQI (US)
33AQI (US)
39AQI (US)
51AQI (US)
43AQI (US)
42AQI (US)
40AQI (US)
35AQI (US)
36AQI (US)
35AQI (US)
35AQI (US)
32AQI (US)
36AQI (US)
37AQI (US)
36AQI (US)
33AQI (US)
33AQI (US)
36AQI (US)
32AQI (US)
30AQI (US)
32AQI (US)
36AQI (US)
32AQI (US)
31AQI (US)
37AQI (US)
38AQI (US)
33AQI (US)
33AQI (US)
34AQI (US)
30AQI (US)
27AQI (US)
28AQI (US)
27AQI (US)
33AQI (US)
33AQI (US)
28AQI (US)
27AQI (US)
26AQI (US)
30AQI (US)
29AQI (US)
38AQI (US)
29AQI (US)
32AQI (US)
33AQI (US)
30AQI (US)
34AQI (US)
34AQI (US)
31AQI (US)
32AQI (US)
32AQI (US)
32AQI (US)
31AQI (US)
31AQI (US)
27AQI (US)
29AQI (US)
32AQI (US)
32AQI (US)
28AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
28AQI (US)
24AQI (US)
22AQI (US)
30AQI (US)
35AQI (US)
32AQI (US)
30AQI (US)
30AQI (US)
33AQI (US)
32AQI (US)
35AQI (US)
31AQI (US)
28AQI (US)
43AQI (US)
51AQI (US)
57AQI (US)
50AQI (US)
52AQI (US)
42AQI (US)
36AQI (US)
48AQI (US)
48AQI (US)
39AQI (US)
42AQI (US)
28AQI (US)
28AQI (US)
27AQI (US)
26AQI (US)
28AQI (US)
29AQI (US)
31AQI (US)
31AQI (US)
29AQI (US)
25AQI (US)
27AQI (US)
24AQI (US)
24AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
27AQI (US)
26AQI (US)
25AQI (US)
23AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
27AQI (US)
24AQI (US)
23AQI (US)
22AQI (US)
25AQI (US)
24AQI (US)
24AQI (US)
24AQI (US)
27AQI (US)
29AQI (US)
26AQI (US)
25AQI (US)
26AQI (US)
26AQI (US)
27AQI (US)
28AQI (US)
25AQI (US)
25AQI (US)
28AQI (US)
30AQI (US)
26AQI (US)
29AQI (US)
32AQI (US)
30AQI (US)
28AQI (US)
30AQI (US)
30AQI (US)
28AQI (US)
29AQI (US)
42AQI (US)
52AQI (US)
45AQI (US)
48AQI (US)
45AQI (US)
46AQI (US)
41AQI (US)
52AQI (US)
44AQI (US)
47AQI (US)
44AQI (US)
46AQI (US)
46AQI (US)
44AQI (US)
49AQI (US)
46AQI (US)
49AQI (US)
58AQI (US)
48AQI (US)
46AQI (US)
47AQI (US)
46AQI (US)
49AQI (US)
48AQI (US)
48AQI (US)
47AQI (US)
46AQI (US)
53AQI (US)
44AQI (US)
42AQI (US)
49AQI (US)
50AQI (US)
46AQI (US)
49AQI (US)
55AQI (US)
51AQI (US)
45AQI (US)
49AQI (US)
51AQI (US)
52AQI (US)
50AQI (US)
55AQI (US)
55AQI (US)
48AQI (US)
44AQI (US)
49AQI (US)
50AQI (US)
49AQI (US)
40AQI (US)
40AQI (US)
45AQI (US)
43AQI (US)
45AQI (US)
48AQI (US)
53AQI (US)
46AQI (US)
38AQI (US)
49AQI (US)
60AQI (US)
52AQI (US)
45AQI (US)
45AQI (US)
49AQI (US)
48AQI (US)
38AQI (US)
44AQI (US)
45AQI (US)
50AQI (US)
49AQI (US)
47AQI (US)
53AQI (US)
46AQI (US)
48AQI (US)
43AQI (US)
48AQI (US)
48AQI (US)
39AQI (US)
38AQI (US)
46AQI (US)
39AQI (US)
43AQI (US)
35AQI (US)
30AQI (US)
35AQI (US)
26AQI (US)
37AQI (US)
49AQI (US)
47AQI (US)
41AQI (US)
No. of days
202638AQI (US)
Highest AQI (US) recorded in
August49AQI (US)
Lowest AQI (US) recorded in
June26AQI (US)
202539AQI (US)
Highest AQI (US) recorded in
October52AQI (US)
Lowest AQI (US) recorded in
July25AQI (US)
202438AQI (US)
Highest AQI (US) recorded in
December55AQI (US)
Lowest AQI (US) recorded in
March11AQI (US)
202332AQI (US)
Highest AQI (US) recorded in
November43AQI (US)
Lowest AQI (US) recorded in
September17AQI (US)
202220AQI (US)
Highest AQI (US) recorded in
November21AQI (US)
Lowest AQI (US) recorded in
December19AQI (US)
202142AQI (US)
Highest AQI (US) recorded in
May51AQI (US)
Lowest AQI (US) recorded in
February34AQI (US)
202044AQI (US)
Highest AQI (US) recorded in
September72AQI (US)
Lowest AQI (US) recorded in
March27AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Berkeley's annual 2026 AQI (US) (38) shows an average percentage change of 13.8% (worsened AQI (US)) compared to previous years: 2020 (44), 2021 (42), 2022 (20), 2023 (32), 2024 (38), 2025 (39).