Stay updated with real-time air quality in Fullerton, California featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
40
Good
Fullerton, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.47 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
19.39 μg/m³
0
55
155
255
425
605+
43.24 ppb
0
55
71
86
201
201+
0.66 ppb
0
36
76
186
605
1005+
11.73 ppb
0
54
101
361
1250
2050+
0.64 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Fullerton, California
Fullerton, California
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AQI 43
Good
5.49μg/m³
PM2.5
17.41μg/m³
PM10
45.93ppb
O3
0.57ppb
SO2
16.99ppb
NO2
0.74ppm
CO
AQI 38
Good
5.52μg/m³
PM2.5
21.70μg/m³
PM10
40.74ppb
O3
0.72ppb
SO2
10.54ppb
NO2
0.55ppm
CO
AQI 40
Good
5.52μg/m³
PM2.5
19.75μg/m³
PM10
42.92ppb
O3
0.65ppb
SO2
13.13ppb
NO2
0.64ppm
CO
AQI 38
Good
5.53μg/m³
PM2.5
20.80μg/m³
PM10
41.41ppb
O3
0.69ppb
SO2
10.88ppb
NO2
0.59ppm
CO
AQI 36
Good
5.48μg/m³
PM2.5
23.62μg/m³
PM10
39.04ppb
O3
0.79ppb
SO2
7.87ppb
NO2
0.47ppm
CO
AQI 35
Good
5.59μg/m³
PM2.5
23.69μg/m³
PM10
38.15ppb
O3
0.76ppb
SO2
9.13ppb
NO2
0.48ppm
CO
Air quality measurements for California, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Air quality data for Fullerton, California is updated on an hourly basis.
The worst air quality in Fullerton, California was recorded at 09:00:00 on 2026-04-23.
The best air quality in Fullerton, California was recorded at 12:00:00 on 2026-04-23.
The real-time air quality index in Fullerton, California is 40, currently categorized as Good.
The most common pollutant in Fullerton, California is O3.
If the air quality in Fullerton, California is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Fullerton, California at present are 5.474 μg/m3.
The current PM10 levels in Fullerton, California are 19.385 μg/m3.
The current carbon monoxide (CO) level in Fullerton, California is 0.639 ppm.
The current sulfur dioxide (SO2) levels in Fullerton, California are 0.662 ppb.
The current ozone (O3) levels at Fullerton, California is 43.242 ppm.
The current nitrogen dioxide (NO2) levels at Fullerton, California is 11.726 ppb.
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