Stay updated with real-time air quality in Monrovia, 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)
33
Good
Monrovia, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.19 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
25.18 μg/m³
0
55
155
255
425
605+
30.09 ppb
0
55
71
86
201
201+
0.79 ppb
0
36
76
186
605
1005+
9.53 ppb
0
54
101
361
1250
2050+
0.27 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Monrovia, California
Monrovia, California
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AQI 33
Good
6.19μg/m³
PM2.5
25.18μg/m³
PM10
30.09ppb
O3
0.79ppb
SO2
9.53ppb
NO2
0.27ppm
CO
AQI 27
Good
4.83μg/m³
PM2.5
19.35μg/m³
PM10
26.29ppb
O3
0.75ppb
SO2
10.85ppb
NO2
0.25ppm
CO
AQI 27
Good
5.16μg/m³
PM2.5
20.58μg/m³
PM10
26.72ppb
O3
0.74ppb
SO2
10.56ppb
NO2
0.25ppm
CO
AQI 23
Good
4.42μg/m³
PM2.5
18.21μg/m³
PM10
24.72ppb
O3
0.74ppb
SO2
11.82ppb
NO2
0.25ppm
CO
AQI 38
Good
6.91μg/m³
PM2.5
23.57μg/m³
PM10
26.63ppb
O3
0.79ppb
SO2
9.19ppb
NO2
0.27ppm
CO
AQI 27
Good
5.38μg/m³
PM2.5
21.74μg/m³
PM10
26.45ppb
O3
0.73ppb
SO2
10.64ppb
NO2
0.25ppm
CO
Air quality and pollutant data for California, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Monrovia, California is updated every hour for accuracy.
In the past 24 hours, the air quality in Monrovia, California was at its worst at 12:00:00 on 2026-04-24.
In the last 24 hours, the best air quality in Monrovia, California was observed at 02:00:00 on 2026-04-23.
As of now, the AQI in Monrovia, California is 33, indicating Good conditions.
Monrovia, California air has the highest levels of PM2.5.
Poor air quality in Monrovia, California means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Monrovia, California are currently 6.191 μg/m3.
The PM10 concentration in Monrovia, California is 25.177 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Monrovia, California is 0.271 ppm.
Currently, Monrovia, California has a sulfur dioxide (SO2) concentration of 0.785 ppb.
The current ozone (O3) level in Monrovia, California at the moment is 30.087 ppm.
Nitrogen dioxide (NO2) level in Monrovia, California at the moment is 9.531 ppb.
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