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Live air quality index in Hemel Hempstead, Hertfordshire today

Stay updated with real-time air quality in Hemel Hempstead, 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)

54

Moderate

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Hemel Hempstead, Hertfordshire

Last updated: ... (Local time)

Major air pollutants in Hemel Hempstead, Hertfordshire

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter2.5 (PM2.5)

11.42 μg/m³

0

12.1

35.5

55.5

250.5

500.5+

Particulate Matter10 (PM10)

20.45 μg/m³

0

55

155

255

425

605+

Ozone (O3)

32.12 ppb

0

55

71

86

201

201+

Sulfur Dioxide (SO2)

0.97 ppb

0

36

76

186

605

1005+

Nitrogen Dioxide (NO2)

9.47 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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Hemel Hempstead, Hertfordshire

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How accurate is Hertfordshire, UK air quality data?

Air quality data and pollutant measurements for Hertfordshire, UK adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.


Frequently asked questions

How often is the air quality data for Hemel Hempstead, Hertfordshire updated?

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The air quality for Hemel Hempstead, Hertfordshire is updated every hour.


When was the worst air quality at Hemel Hempstead, Hertfordshire in the last 24 hrs?

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The worst air quality in Hemel Hempstead, Hertfordshire in the last 24 hours was observed at 05:00:00 on 2025-06-13.


When was the best air quality at Hemel Hempstead, Hertfordshire in the last 24 hrs?

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In the last 24 hrs, the best air quality in Hemel Hempstead, Hertfordshire was observed at 03:00:00 on 2025-06-13.


What is the current air quality in Hemel Hempstead, Hertfordshire?

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The current air quality in Hemel Hempstead, Hertfordshire is 54, categorized as Moderate based on real-time data.


What pollutant is the most common in Hemel Hempstead, Hertfordshire?

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The most common pollutant in Hemel Hempstead, Hertfordshire is PM2.5.


What should I do if the air quality in Hemel Hempstead, Hertfordshire is poor?

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If the air quality in Hemel Hempstead, Hertfordshire is poor, consider staying indoors and wearing a mask to protect yourself.


What is the current concentration of PM2.5 in Hemel Hempstead, Hertfordshire?

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The current PM2.5 concentration at Hemel Hempstead, Hertfordshire is 11.42 μg/m3.


What is the current concentration of PM10 in Hemel Hempstead, Hertfordshire?

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The current PM10 concentration at Hemel Hempstead, Hertfordshire is 20.445 μg/m3.


What is the current concentration of carbon monoxide (CO) in Hemel Hempstead, Hertfordshire?

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The current carbon monoxide (CO) concentration at Hemel Hempstead, Hertfordshire is 0.268 ppm.


What is the current concentration of sulfur dioxide (SO2) in Hemel Hempstead, Hertfordshire?

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The current sulfur dioxide (SO2) concentration at Hemel Hempstead, Hertfordshire is 0.969 ppb.


What is the current concentration of ozone (O3) in Hemel Hempstead, Hertfordshire?

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The current ozone (O3) concentration at Hemel Hempstead, Hertfordshire is 32.123 ppm.


What is the current concentration of nitrogen dioxide (NO2) in Hemel Hempstead, Hertfordshire?

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The current nitrogen dioxide (NO2) concentration at Hemel Hempstead, Hertfordshire is 9.471 ppb.


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