Pasadena, 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
Pasadena, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (24th October ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 58 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 24th Oct - 25th Oct 2025
Pasadena, California, United States
6 AM24th Oct 2025
6 PM
5 AM25th Oct 2025
55AQI
39AQI
51AQI
42AQI
In the last 24 hours,
Pasadena's AQI reached its highest point of 55 at 4 PM during the Day, while the lowest point, 39, was recorded at 8 AM during the Day between 24th Oct and 25th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Pasadena, California, United States
22°C16/30°C
20°C17/23°C
21°C18/28°C
21°C18/29°C
20°C15/29°C
20°C17/28°C
20°C14/29°C
21°C15/30°C
19°C15/25°C
19°C14/29°C
20°C13/31°C
18°C13/29°C
19°C13/29°C
17°C13/26°C
20°C13/31°C
23°C17/33°C
22°C15/31°C
19°C13/30°C
17°C13/22°C
14°C12/15°C
15°C11/22°C
18°C11/27°C
21°C14/31°C
22°C15/33°C
21°C15/32°C
21°C14/32°C
19°C14/29°C
18°C13/23°C
17°C12/27°C
19°C13/30°C
--°C/°C
50AQI
47AQI
47AQI
42AQI
2025 Days Vs Air Quality
Pasadena, California, United States
65%
139
35%
74
Total number of days with different AQI categories in last 298 days in 2025 (67 days remaining)
Under WHO’s Safe Air Quality Limits: 65%
Health Risk Level:
Moderate
In 2025, 65% of 298 days were within WHO’s safe air quality limits, and 35% exceeded them. The risk of health issues is Moderate, particularly for individuals with respiratory or heart conditions.
Annual Air Quality Insights
Pasadena, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
34AQI
27AQI
27AQI
32AQI
30AQI
18AQI
21AQI
22AQI
28AQI
31AQI
24AQI
27AQI
34AQI
48AQI
49AQI
51AQI
52AQI
55AQI
55AQI
53AQI
50AQI
40AQI
30AQI
28AQI
35AQI
41AQI
48AQI
53AQI
46AQI
40AQI
40AQI
21AQI
21AQI
27AQI
36AQI
50AQI
48AQI
42AQI
42AQI
29AQI
39AQI
36AQI
36AQI
45AQI
46AQI
41AQI
40AQI
47AQI
24AQI
34AQI
46AQI
51AQI
45AQI
35AQI
46AQI
51AQI
52AQI
58AQI
58AQI
54AQI
49AQI
49AQI
47AQI
46AQI
44AQI
48AQI
52AQI
47AQI
37AQI
34AQI
36AQI
39AQI
38AQI
42AQI
46AQI
47AQI
52AQI
51AQI
52AQI
52AQI
54AQI
56AQI
59AQI
60AQI
59AQI
55AQI
55AQI
53AQI
53AQI
54AQI
51AQI
47AQI
51AQI
53AQI
50AQI
50AQI
43AQI
42AQI
45AQI
43AQI
47AQI
92AQI
60AQI
54AQI
48AQI
44AQI
47AQI
52AQI
54AQI
50AQI
43AQI
39AQI
32AQI
27AQI
30AQI
38AQI
42AQI
40AQI
32AQI
30AQI
29AQI
25AQI
27AQI
29AQI
30AQI
36AQI
47AQI
52AQI
52AQI
50AQI
56AQI
61AQI
68AQI
69AQI
64AQI
63AQI
60AQI
55AQI
55AQI
56AQI
58AQI
60AQI
55AQI
44AQI
47AQI
48AQI
49AQI
48AQI
54AQI
56AQI
56AQI
57AQI
51AQI
54AQI
50AQI
50AQI
46AQI
49AQI
52AQI
50AQI
45AQI
50AQI
45AQI
47AQI
49AQI
48AQI
38AQI
29AQI
31AQI
32AQI
36AQI
48AQI
55AQI
57AQI
57AQI
37AQI
37AQI
40AQI
35AQI
38AQI
41AQI
40AQI
43AQI
41AQI
27AQI
24AQI
24AQI
25AQI
32AQI
39AQI
35AQI
36AQI
51AQI
58AQI
43AQI
56AQI
51AQI
49AQI
52AQI
56AQI
54AQI
54AQI
27AQI
27AQI
46AQI
53AQI
54AQI
52AQI
59AQI
61AQI
43AQI
42AQI
58AQI
28AQI
39AQI
45AQI
49AQI
42AQI
55AQI
40AQI
48AQI
No. of days
202545AQI
Highest AQI recorded in
August55AQI
Lowest AQI recorded in
March28AQI
Most & Least Polluted Years Over the Last 1 Years
Pasadena's annual 2025 AQI (45) shows an average percentage change of NaN% (improved AQI) compared to previous years: .