Stay updated with real-time air quality in Ontario, 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)
38
Good
Ontario, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
6.77 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
26.15 μg/m³
0
55
155
255
425
605+
13.25 ppb
0
55
71
86
201
201+
0.26 ppb
0
36
76
186
605
1005+
11.35 ppb
0
54
101
361
1250
2050+
0.28 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Ontario, California
Ontario, California
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AQI 44
Good
8.05μg/m³
PM2.5
27.20μg/m³
PM10
13.69ppb
O3
0.27ppb
SO2
12.60ppb
NO2
0.29ppm
CO
AQI 52
Moderate
10.14μg/m³
PM2.5
31.11μg/m³
PM10
16.05ppb
O3
0.25ppb
SO2
11.18ppb
NO2
0.29ppm
CO
AQI 44
Good
7.75μg/m³
PM2.5
27.72μg/m³
PM10
14.19ppb
O3
0.25ppb
SO2
11.03ppb
NO2
0.28ppm
CO
AQI 49
Good
9.02μg/m³
PM2.5
25.67μg/m³
PM10
13.21ppb
O3
0.29ppb
SO2
15.05ppb
NO2
0.29ppm
CO
AQI 54
Moderate
11.18μg/m³
PM2.5
31.98μg/m³
PM10
16.80ppb
O3
0.25ppb
SO2
11.11ppb
NO2
0.29ppm
CO
AQI 58
Moderate
12.68μg/m³
PM2.5
36.48μg/m³
PM10
17.93ppb
O3
0.24ppb
SO2
11.19ppb
NO2
0.30ppm
CO
The air quality data for California, USA is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.
Source: Ambee Data Sources
Air quality updates for Ontario, California are available every hour.
Ontario, California experienced its worst air quality at 12:00:00, 2025-07-14.
The best air quality in Ontario, California was observed at 10:00:00 on 2025-07-14.
The air quality in Ontario, California right now is Good, with an AQI of 38.
In Ontario, California, PM2.5 is the most frequently found pollutant.
When air quality in Ontario, California is compromised, staying indoors and wearing a mask can reduce health risks.
Ontario, California currently has a PM2.5 concentration of 6.771 μg/m3.
Ontario, California currently has a PM10 concentration of 26.154 μg/m3.
The current carbon monoxide (CO) level in Ontario, California is 0.279 ppm.
The current sulfur dioxide (SO2) concentration in Ontario, California is 0.258 ppb.
Ontario, California currently has an ozone (O3) concentration of 13.253 ppm.
The current level of nitrogen dioxide (NO2) in Ontario, California is 11.353 ppb.
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