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Live air quality index in Watford, Hertfordshire today

Stay updated with real-time air quality in Watford, Hertfordshire 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)

44

Good

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Watford, Hertfordshire

Last updated: ... (Local time)

Major air pollutants in Watford, Hertfordshire

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter2.5 (PM2.5)

8.26 μg/m³

0

12.1

35.5

55.5

250.5

500.5+

Particulate Matter10 (PM10)

18.87 μg/m³

0

55

155

255

425

605+

Ozone (O3)

35.59 ppb

0

55

71

86

201

201+

Sulfur Dioxide (SO2)

0.86 ppb

0

36

76

186

605

1005+

Nitrogen Dioxide (NO2)

7.04 ppb

0

54

101

361

1250

2050+

Carbon Monoxide (CO)

0.27 ppm

0

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

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Watford, Hertfordshire

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Track live Watford, Hertfordshire air quality forecast and history

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Watford, Hertfordshire air quality map: Real-time AQI near you




How accurate is Hertfordshire, UK air quality data?

Air quality measurements for Hertfordshire, UK 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 Watford, Hertfordshire updated?

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Air quality data for Watford, Hertfordshire is updated on an hourly basis.


When did Watford, Hertfordshire experience the worst air quality in the last 24 hours?

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The worst air quality in Watford, Hertfordshire was recorded at 02:00:00 on 2025-06-13.


When did Watford, Hertfordshire have its best air quality in the last 24 hours?

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The best air quality in Watford, Hertfordshire was recorded at 10:00:00 on 2025-06-13.


What is the real-time air quality index for Watford, Hertfordshire?

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The real-time air quality index in Watford, Hertfordshire is 44, currently categorized as Good.


Which pollutant is found most often in Watford, Hertfordshire?

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The most common pollutant in Watford, Hertfordshire is PM2.5.


What can I do if the air quality in Watford, Hertfordshire is poor?

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


What are the current PM2.5 levels in Watford, Hertfordshire?

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The measured PM2.5 levels in Watford, Hertfordshire at present are 8.261 μg/m3.


What are the current PM10 levels at Watford, Hertfordshire?

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The current PM10 levels in Watford, Hertfordshire are 18.869 μg/m3.


What are the current carbon monoxide (CO) levels at Watford, Hertfordshire?

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The current carbon monoxide (CO) level in Watford, Hertfordshire is 0.266 ppm.


What are the current sulfur dioxide (SO2) levels at Watford, Hertfordshire?

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The current sulfur dioxide (SO2) levels in Watford, Hertfordshire are 0.857 ppb.


What are the current ozone (O3) levels at Watford, Hertfordshire?

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The current ozone (O3) levels at Watford, Hertfordshire is 35.587 ppm.


What are the current nitrogen dioxide (NO2) levels at Watford, Hertfordshire?

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The current nitrogen dioxide (NO2) levels at Watford, Hertfordshire is 7.035 ppb.


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