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Real-time air quality index in Monrovia, California today

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)

54

Moderate

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Monrovia, California

Last updated: ... (Local time)

Major air pollutants in Monrovia, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter2.5 (PM2.5)

11.21 μg/m³

0

12.1

35.5

55.5

250.5

500.5+

Particulate Matter10 (PM10)

41.14 μg/m³

0

55

155

255

425

605+

Ozone (O3)

31.07 ppb

0

55

71

86

201

201+

Sulfur Dioxide (SO2)

0.46 ppb

0

36

76

186

605

1005+

Nitrogen Dioxide (NO2)

8.19 ppb

0

54

101

361

1250

2050+

Carbon Monoxide (CO)

0.20 ppm

0

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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Monrovia, California

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Monrovia, California air quality map: Stay updated on AQI near you




How accurate is California, USA air quality data?

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.


Frequently asked questions

How often is air quality information updated for Monrovia, California?

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The air quality information for Monrovia, California is updated every hour for accuracy.


What time in the last 24 hours was the air quality in Monrovia, California at its worst?

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In the past 24 hours, the air quality in Monrovia, California was at its worst at 10:00:00 on 2025-06-06.


When did Monrovia, California experience the best air quality in the last 24 hours?

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In the last 24 hours, the best air quality in Monrovia, California was observed at 10:00:00 on 2025-06-07.


What is the AQI in Monrovia, California right now?

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As of now, the AQI in Monrovia, California is 54, indicating Moderate conditions.


What is the most common type of pollution in Monrovia, California?

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Monrovia, California air has the highest levels of PM2.5.


What should I do in case of poor air quality in Monrovia, California?

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Poor air quality in Monrovia, California means it's advisable to stay indoors and wear a mask for your protection.


What is the PM2.5 level in Monrovia, California at the moment?

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PM2.5 levels in Monrovia, California are currently 11.21 μg/m3.


What is the PM10 level in Monrovia, California at the moment?

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The PM10 concentration in Monrovia, California is 41.141 μg/m3 at the moment.


What is the carbon monoxide (CO) level in Monrovia, California at the moment?

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The current carbon monoxide (CO) concentration in Monrovia, California is 0.198 ppm.


What is the sulfur dioxide (SO2) level in Monrovia, California at the moment?

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Currently, Monrovia, California has a sulfur dioxide (SO2) concentration of 0.455 ppb.


What is the ozone (O3) level in Monrovia, California at the moment?

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The current ozone (O3) level in Monrovia, California at the moment is 31.073 ppm.


What is the nitrogen dioxide (NO2) level in Monrovia, California at the moment?

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Nitrogen dioxide (NO2) level in Monrovia, California at the moment is 8.187 ppb.


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