Fontana, California, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
February Air Quality Analysis
Fontana, California, United States
AQI Trends: Highest and Lowest
Same Day Analysis (6th February):
On this day, AQI across the 1 years varied significantly: 2026 ranks 1st highest AQI at 44 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 5th Feb - 6th Feb 2026
Fontana, California, United States
6 AM5th Feb 2026
5 PM
5 AM6th Feb 2026
90AQI
32AQI
56AQI
25AQI
In the last 24 hours,
Fontana's AQI reached its highest point of 90 at 12 PM during the Day, while the lowest point, 25, was recorded at 3 AM during the Night between 5th Feb and 6th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Fontana, California, United States
11°C7/17°C
11°C6/18°C
15°C11/20°C
17°C14/23°C
19°C15/24°C
21°C17/28°C
23°C19/29°C
19°C12/26°C
17°C11/26°C
16°C11/24°C
17°C12/24°C
18°C10/28°C
21°C16/27°C
16°C10/24°C
14°C11/19°C
14°C11/19°C
15°C10/23°C
15°C9/23°C
15°C7/23°C
16°C7/25°C
16°C8/25°C
20°C16/26°C
22°C17/28°C
22°C16/29°C
22°C16/31°C
18°C12/28°C
20°C10/30°C
24°C20/30°C
21°C13/30°C
17°C12/22°C
59AQI
37AQI
37AQI
32AQI
2026 Days Vs Air Quality
Fontana, California, United States
78%
29
22%
8
Total number of days with different AQI categories in last 38 days in 2026 (327 days remaining)
Under WHO’s Safe Air Quality Limits: 78%
Health Risk Level:
Low
In 2026, 78% of 38 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
Fontana, California, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
30AQI (US)
38AQI (US)
20AQI (US)
26AQI (US)
24AQI (US)
32AQI (US)
35AQI (US)
33AQI (US)
27AQI (US)
22AQI (US)
21AQI (US)
21AQI (US)
27AQI (US)
25AQI (US)
34AQI (US)
33AQI (US)
23AQI (US)
31AQI (US)
49AQI (US)
39AQI (US)
56AQI (US)
62AQI (US)
52AQI (US)
37AQI (US)
39AQI (US)
43AQI (US)
41AQI (US)
46AQI (US)
50AQI (US)
54AQI (US)
40AQI (US)
54AQI (US)
52AQI (US)
55AQI (US)
50AQI (US)
52AQI (US)
44AQI (US)
36AQI (US)
51AQI (US)
No. of days
202638AQI (US)
Highest AQI (US) recorded in
February51AQI (US)
Lowest AQI (US) recorded in
January36AQI (US)
202551AQI (US)
Highest AQI (US) recorded in
December61AQI (US)
Lowest AQI (US) recorded in
March39AQI (US)
Most & Least Polluted Years Over the Last 2 Years
Fontana's annual 2026 AQI (US) (38) shows an average percentage change of -25.5% (improved AQI (US)) compared to previous years: 2025 (51).