San Diego, California, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
March Air Quality Analysis
San Diego, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (5th March):
On this day, AQI across the 2 years varied significantly: 2026 ranks 1st highest AQI at 26 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Mar - 5th Mar 2026
San Diego, California, United States
6 AM4th Mar 2026
5 PM
5 AM5th Mar 2026
55AQI
21AQI
34AQI
21AQI
In the last 24 hours,
San Diego's AQI reached its highest point of 55 at 5 PM during the Day, while the lowest point, 21, was recorded at 12 AM during the Night between 4th Mar and 5th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
San Diego, California, United States
20°C12/32°C
18°C15/24°C
17°C15/20°C
16°C12/20°C
19°C12/31°C
19°C12/30°C
16°C15/17°C
15°C13/17°C
15°C12/20°C
15°C12/20°C
14°C10/20°C
15°C11/20°C
13°C11/18°C
14°C10/17°C
13°C11/15°C
12°C8/15°C
13°C10/17°C
14°C7/23°C
16°C10/26°C
18°C11/27°C
18°C12/27°C
18°C12/28°C
19°C13/29°C
23°C15/35°C
21°C14/30°C
21°C14/32°C
17°C13/22°C
16°C12/22°C
15°C12/18°C
17°C13/22°C
53AQI
24AQI
28AQI
23AQI
2026 Days Vs Air Quality
San Diego, California, United States
97%
62
3%
2
Total number of days with different AQI categories in last 65 days in 2026 (300 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2026, 97% of 65 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
San Diego, California, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
24AQI (US)
20AQI (US)
16AQI (US)
13AQI (US)
21AQI (US)
30AQI (US)
31AQI (US)
33AQI (US)
23AQI (US)
25AQI (US)
29AQI (US)
29AQI (US)
30AQI (US)
41AQI (US)
36AQI (US)
42AQI (US)
35AQI (US)
32AQI (US)
42AQI (US)
52AQI (US)
71AQI (US)
49AQI (US)
38AQI (US)
24AQI (US)
31AQI (US)
31AQI (US)
24AQI (US)
36AQI (US)
41AQI (US)
48AQI (US)
32AQI (US)
42AQI (US)
44AQI (US)
44AQI (US)
38AQI (US)
42AQI (US)
42AQI (US)
36AQI (US)
34AQI (US)
38AQI (US)
42AQI (US)
23AQI (US)
22AQI (US)
31AQI (US)
39AQI (US)
38AQI (US)
38AQI (US)
27AQI (US)
29AQI (US)
26AQI (US)
22AQI (US)
22AQI (US)
27AQI (US)
32AQI (US)
36AQI (US)
34AQI (US)
32AQI (US)
31AQI (US)
30AQI (US)
30AQI (US)
43AQI (US)
29AQI (US)
30AQI (US)
26AQI (US)
33AQI (US)
34AQI (US)
32AQI (US)
No. of days
202633AQI (US)
Highest AQI (US) recorded in
February34AQI (US)
Lowest AQI (US) recorded in
March32AQI (US)
202548AQI (US)
Highest AQI (US) recorded in
December58AQI (US)
Lowest AQI (US) recorded in
March33AQI (US)
Most & Least Polluted Years Over the Last 2 Years
San Diego's annual 2026 AQI (US) (33) shows an average percentage change of -30.8% (improved AQI (US)) compared to previous years: 2025 (48).