East 20th Street, Signal Hill, 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
East 20th Street, Signal Hill, 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 57 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
East 20th Street, Signal Hill, California, United States
6 AM24th Oct 2025
6 PM
5 AM25th Oct 2025
78AQI
48AQI
71AQI
55AQI
In the last 24 hours,
East 20th Street's AQI reached its highest point of 78 at 5 PM during the Day, while the lowest point, undefined, was recorded at 5 AM during the Night between 24th Oct and 25th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
East 20th Street, Signal Hill, California, United States
21°C19/26°C
20°C18/23°C
21°C19/25°C
22°C17/28°C
21°C17/26°C
21°C18/25°C
21°C17/26°C
21°C15/28°C
21°C17/26°C
20°C15/26°C
20°C14/27°C
19°C14/24°C
19°C16/25°C
19°C16/24°C
20°C14/29°C
22°C16/33°C
20°C15/27°C
19°C14/26°C
18°C15/21°C
16°C13/18°C
17°C13/24°C
19°C11/28°C
21°C12/32°C
21°C13/31°C
21°C15/30°C
20°C14/30°C
19°C14/25°C
19°C15/24°C
19°C14/26°C
18°C14/24°C
--°C/°C
51AQI
46AQI
46AQI
37AQI
2025 Days Vs Air Quality
East 20th Street, Signal Hill, California, United States
75%
160
25%
53
Total number of days with different AQI categories in last 298 days in 2025 (67 days remaining)
Under WHO’s Safe Air Quality Limits: 75%
Health Risk Level:
Low
In 2025, 75% of 298 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
East 20th Street, Signal Hill, California, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
34AQI
24AQI
35AQI
40AQI
35AQI
23AQI
32AQI
36AQI
37AQI
39AQI
30AQI
34AQI
39AQI
42AQI
50AQI
47AQI
42AQI
46AQI
47AQI
51AQI
43AQI
40AQI
29AQI
33AQI
43AQI
45AQI
50AQI
50AQI
42AQI
41AQI
36AQI
21AQI
17AQI
27AQI
40AQI
41AQI
32AQI
38AQI
26AQI
36AQI
36AQI
35AQI
40AQI
47AQI
51AQI
43AQI
53AQI
44AQI
25AQI
36AQI
49AQI
50AQI
41AQI
32AQI
42AQI
51AQI
50AQI
50AQI
51AQI
50AQI
46AQI
45AQI
40AQI
43AQI
34AQI
41AQI
46AQI
44AQI
30AQI
28AQI
28AQI
21AQI
24AQI
28AQI
26AQI
28AQI
35AQI
44AQI
40AQI
51AQI
51AQI
53AQI
58AQI
59AQI
57AQI
54AQI
53AQI
55AQI
54AQI
54AQI
52AQI
48AQI
47AQI
50AQI
49AQI
44AQI
36AQI
40AQI
42AQI
38AQI
42AQI
78AQI
58AQI
55AQI
41AQI
38AQI
45AQI
47AQI
47AQI
44AQI
38AQI
29AQI
22AQI
25AQI
27AQI
38AQI
38AQI
37AQI
27AQI
30AQI
28AQI
25AQI
26AQI
29AQI
30AQI
36AQI
43AQI
49AQI
49AQI
46AQI
46AQI
56AQI
62AQI
63AQI
57AQI
49AQI
54AQI
51AQI
51AQI
51AQI
54AQI
52AQI
46AQI
35AQI
41AQI
45AQI
48AQI
48AQI
53AQI
59AQI
54AQI
48AQI
51AQI
48AQI
53AQI
53AQI
50AQI
49AQI
52AQI
52AQI
53AQI
47AQI
46AQI
51AQI
45AQI
44AQI
32AQI
25AQI
28AQI
24AQI
32AQI
37AQI
51AQI
56AQI
62AQI
42AQI
48AQI
47AQI
46AQI
46AQI
45AQI
41AQI
46AQI
40AQI
27AQI
24AQI
26AQI
32AQI
46AQI
40AQI
29AQI
32AQI
50AQI
60AQI
42AQI
57AQI
47AQI
47AQI
52AQI
58AQI
56AQI
55AQI
20AQI
21AQI
43AQI
48AQI
51AQI
50AQI
58AQI
62AQI
46AQI
45AQI
57AQI
32AQI
39AQI
42AQI
43AQI
38AQI
51AQI
41AQI
47AQI
No. of days
202543AQI
Highest AQI recorded in
August51AQI
Lowest AQI recorded in
March32AQI
Most & Least Polluted Years Over the Last 1 Years
East 20th Street's annual 2025 AQI (43) shows an average percentage change of NaN% (improved AQI) compared to previous years: .