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Live air quality index in Millbrae, California today

Stay updated with real-time air quality in Millbrae, 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)

24

Good

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Millbrae, California

Last updated: ... (Local time)

Major air pollutants in Millbrae, California

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter2.5 (PM2.5)

4.24 μg/m³

0

12.1

35.5

55.5

250.5

500.5+

Particulate Matter10 (PM10)

16.67 μg/m³

0

55

155

255

425

605+

Ozone (O3)

26.35 ppb

0

55

71

86

201

201+

Sulfur Dioxide (SO2)

1.36 ppb

0

36

76

186

605

1005+

Nitrogen Dioxide (NO2)

4.07 ppb

0

54

101

361

1250

2050+

Carbon Monoxide (CO)

0.34 ppm

0

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

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Millbrae, California

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Millbrae, California air quality map: Real-time AQI near you




How accurate is California, USA air quality data?

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.


Frequently asked questions

How frequently is the air quality data for Millbrae, California updated?

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Air quality data for Millbrae, California is updated on an hourly basis.


When did Millbrae, California experience the worst air quality in the last 24 hours?

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The worst air quality in Millbrae, California was recorded at 10:00:00 on 2025-06-05.


When did Millbrae, California have its best air quality in the last 24 hours?

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The best air quality in Millbrae, California was recorded at 08:00:00 on 2025-06-06.


What is the real-time air quality index for Millbrae, California?

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The real-time air quality index in Millbrae, California is 24, currently categorized as Good.


Which pollutant is found most often in Millbrae, California?

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The most common pollutant in Millbrae, California is O3.


What can I do if the air quality in Millbrae, California is poor?

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If the air quality in Millbrae, California is poor, limit outdoor activities and use a mask to safeguard your health.


What are the current PM2.5 levels in Millbrae, California?

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The measured PM2.5 levels in Millbrae, California at present are 4.243 μg/m3.


What are the current PM10 levels at Millbrae, California?

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The current PM10 levels in Millbrae, California are 16.67 μg/m3.


What are the current carbon monoxide (CO) levels at Millbrae, California?

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The current carbon monoxide (CO) level in Millbrae, California is 0.341 ppm.


What are the current sulfur dioxide (SO2) levels at Millbrae, California?

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The current sulfur dioxide (SO2) levels in Millbrae, California are 1.356 ppb.


What are the current ozone (O3) levels at Millbrae, California?

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The current ozone (O3) levels at Millbrae, California is 26.349 ppm.


What are the current nitrogen dioxide (NO2) levels at Millbrae, California?

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The current nitrogen dioxide (NO2) levels at Millbrae, California is 4.074 ppb.


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