What is the sulfur dioxide (SO2) level in Letchworth, Hertfordshire at the moment?

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO2) concentration of 0.735 ppb.

What is the ozone (O3) level in Letchworth, Hertfordshire at the moment?

The current ozone (O3) level in Letchworth, Hertfordshire at the moment is 15.361 ppm.

What is the nitrogen dioxide (NO2) level in Letchworth, Hertfordshire at the moment?

Nitrogen dioxide (NO2) level in Letchworth, Hertfordshire at the moment is 10.5 ppb.

Live air quality index in Letchworth, Hertfordshire today

Q: What is the PM2.5 level in Letchworth, Hertfordshire at the moment?

PM2.5 levels in Letchworth, Hertfordshire are currently 6.46 μg/m3.

Q: What is the PM10 level in Letchworth, Hertfordshire at the moment?

The PM10 concentration in Letchworth, Hertfordshire is 21.208 μg/m3 at the moment.

Stay updated with real-time air quality in Letchworth, Hertfordshire featuring accurate data on AQI, PM_2.5, 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)

Good

Letchworth, Hertfordshire

Last updated: ... (Local time)

Major air pollutants in Letchworth, Hertfordshire

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

7.05 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

32.40 μg/m³

155

255

425

605+

Ozone (O₃)

21.84 ppb

201

201+

Sulfur Dioxide (SO₂)

1.79 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.47 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.30 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Letchworth, Hertfordshire

Get Live Pollen Counts

Letchworth, Hertfordshire

Scroll To Air Quality Map

Track live Letchworth, Hertfordshire air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-11-06T05:00:00.000Z	38 \| good	6.691 \| good	8.727 \| good	23.152 \| good	0.279 \| good	3.93 \| good	0.119 \| good
2025-11-06T06:00:00.000Z	44 \| good	7.696 \| good	26.308 \| good	13.592 \| good	0.544 \| good	7.663 \| good	0.011 \| good
2025-11-06T07:00:00.000Z	38 \| good	6.792 \| good	21.785 \| good	16.46 \| good	0.939 \| good	8.205 \| good	0.603 \| good
2025-11-06T08:00:00.000Z	33 \| good	6.46 \| good	21.208 \| good	15.361 \| good	0.735 \| good	10.5 \| good	0.014 \| good
2025-11-06T09:00:00.000Z	33 \| good	5.89 \| good	19.757 \| good	16.331 \| good	1.068 \| good	16.917 \| good	0.514 \| good
2025-11-06T10:00:00.000Z	44 \| good	7.712 \| good	22.527 \| good	14.863 \| good	0.872 \| good	12.86 \| good	0.01 \| good
2025-11-06T11:00:00.000Z	44 \| good	7.672 \| good	21.949 \| good	16.149 \| good	0.619 \| good	13.17 \| good	0.01 \| good
2025-11-06T12:00:00.000Z	38 \| good	7.425 \| good	17.08 \| good	16.198 \| good	0.704 \| good	16.585 \| good	0.007 \| good
2025-11-06T13:00:00.000Z	44 \| good	7.757 \| good	22.965 \| good	14.602 \| good	0.842 \| good	10.404 \| good	0.006 \| good
2025-11-06T14:00:00.000Z	33 \| good	6.495 \| good	21.685 \| good	17.007 \| good	1.042 \| good	9.234 \| good	0.006 \| good
2025-11-06T15:00:00.000Z	33 \| good	6.185 \| good	20.911 \| good	14.303 \| good	0.996 \| good	13.676 \| good	0.007 \| good
2025-11-06T16:00:00.000Z	33 \| good	5.856 \| good	14.86 \| good	20.19 \| good	0.927 \| good	13.215 \| good	0.01 \| good
2025-11-06T17:00:00.000Z	33 \| good	5.508 \| good	21.905 \| good	21.42 \| good	0.936 \| good	14.027 \| good	0.018 \| good
2025-11-06T18:00:00.000Z	44 \| good	7.726 \| good	21.88 \| good	20.872 \| good	0.907 \| good	10.404 \| good	0.019 \| good
2025-11-06T19:00:00.000Z	33 \| good	6.489 \| good	23.733 \| good	21.326 \| good	1.088 \| good	10.543 \| good	0.021 \| good
2025-11-06T20:00:00.000Z	33 \| good	5.686 \| good	27.564 \| good	17.43 \| good	0.848 \| good	10.88 \| good	0.024 \| good
2025-11-06T21:00:00.000Z	38 \| good	7.46 \| good	33.329 \| good	16.212 \| good	0.833 \| good	14.65 \| good	0.019 \| good
2025-11-06T22:00:00.000Z	44 \| good	7.702 \| good	15.382 \| good	17.823 \| good	1.088 \| good	20.747 \| good	0.022 \| good
2025-11-06T23:00:00.000Z	44 \| good	7.585 \| good	19.424 \| good	15.257 \| good	0.745 \| good	15.591 \| good	0.025 \| good
2025-11-07T00:00:00.000Z	38 \| good	7.122 \| good	35.577 \| good	12.932 \| good	1.361 \| good	16.957 \| good	0.553 \| good
2025-11-07T01:00:00.000Z	44 \| good	7.788 \| good	17.629 \| good	10.039 \| good	1.455 \| good	13.599 \| good	0.485 \| good
2025-11-07T02:00:00.000Z	49 \| good	8.567 \| good	21.901 \| good	8.07 \| good	1.296 \| good	12.174 \| good	0.441 \| good
2025-11-07T03:00:00.000Z	44 \| good	8.015 \| good	31.474 \| good	8.749 \| good	1.869 \| good	9.882 \| good	0.401 \| good
2025-11-07T04:00:00.000Z	60 \| moderate	13.503 \| fine	46.101 \| good	6.461 \| good	2.316 \| good	7.338 \| good	0.34 \| good
2025-11-07T05:00:00.000Z	52 \| moderate	10.13 \| good	40.527 \| good	13.564 \| good	2.011 \| good	9.86 \| good	0.338 \| good
2025-11-07T06:00:00.000Z	44 \| good	8.173 \| good	22.327 \| good	11.107 \| good	1.974 \| good	9.244 \| good	0.009 \| good
2025-11-07T07:00:00.000Z	38 \| good	6.673 \| good	13.078 \| good	16.111 \| good	2.091 \| good	9.59 \| good	0.014 \| good
2025-11-07T08:00:00.000Z	54 \| moderate	11.341 \| good	14.497 \| good	12.734 \| good	0.715 \| good	9.024 \| good	0.011 \| good
2025-11-07T09:00:00.000Z	54 \| moderate	10.988 \| good	12.685 \| good	14.531 \| good	0.561 \| good	11.192 \| good	0.143 \| good
2025-11-07T10:00:00.000Z	52 \| moderate	9.812 \| good	11.336 \| good	14.87 \| good	0.563 \| good	10.744 \| good	0.14 \| good
2025-11-07T11:00:00.000Z	49 \| good	8.761 \| good	9.971 \| good	15.399 \| good	0.653 \| good	11.137 \| good	0.142 \| good
2025-11-07T12:00:00.000Z	38 \| good	7.108 \| good	8.989 \| good	16.657 \| good	0.535 \| good	9.361 \| good	0.146 \| good
2025-11-07T13:00:00.000Z	52 \| moderate	9.544 \| good	27.92 \| good	15.735 \| good	0.519 \| good	15.793 \| good	0.009 \| good
2025-11-07T14:00:00.000Z	56 \| moderate	12.3 \| fine	31.505 \| good	17.759 \| good	0.519 \| good	13.111 \| good	0.012 \| good
2025-11-07T15:00:00.000Z	52 \| moderate	10.204 \| good	17.52 \| good	19.47 \| good	0.525 \| good	11.95 \| good	0.012 \| good
2025-11-07T16:00:00.000Z	44 \| good	8.139 \| good	19.04 \| good	17.065 \| good	0.641 \| good	10 \| good	0.013 \| good
2025-11-07T17:00:00.000Z	49 \| good	8.934 \| good	23.89 \| good	17.958 \| good	0.583 \| good	9.574 \| good	0.015 \| good
2025-11-07T18:00:00.000Z	33 \| good	5.979 \| good	21.138 \| good	19.875 \| good	2.028 \| good	9.574 \| good	0.02 \| good
2025-11-07T19:00:00.000Z	52 \| moderate	9.92 \| good	26.938 \| good	20.8 \| good	2.015 \| good	9.681 \| good	0.025 \| good
2025-11-07T20:00:00.000Z	52 \| moderate	10.4 \| good	25.559 \| good	21.93 \| good	0.559 \| good	13.955 \| good	0.022 \| good
2025-11-07T21:00:00.000Z	49 \| good	8.793 \| good	31.268 \| good	18.051 \| good	0.492 \| good	15.244 \| good	0.022 \| good
2025-11-07T22:00:00.000Z	56 \| moderate	12.3 \| fine	20.975 \| good	18.827 \| good	0.509 \| good	9.894 \| good	0.025 \| good
2025-11-07T23:00:00.000Z	52 \| moderate	10.453 \| good	20.657 \| good	20.936 \| good	0.415 \| good	11.842 \| good	0.035 \| good
2025-11-08T00:00:00.000Z	49 \| good	8.768 \| good	31.685 \| good	19.32 \| good	1.707 \| good	8.481 \| good	0.861 \| good
2025-11-08T01:00:00.000Z	44 \| good	7.74 \| good	18.757 \| good	19.944 \| good	1.908 \| good	7.504 \| good	0.441 \| good
2025-11-08T02:00:00.000Z	27 \| good	5.028 \| good	26.677 \| good	20.076 \| good	1.548 \| good	4.17 \| good	0.332 \| good
2025-11-08T03:00:00.000Z	38 \| good	7.055 \| good	32.4 \| good	21.842 \| good	1.786 \| good	4.468 \| good	0.296 \| good
2025-11-08T04:00:00.000Z	38 \| good	7.055 \| good	32.4 \| good	21.842 \| good	1.786 \| good	4.468 \| good	0.296 \| good

Letchworth

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Letchworth, Hertfordshire air quality map: Stay updated on AQI near you

0.60ppm

How accurate is Hertfordshire, UK air quality data?

Air quality and pollutant data for Hertfordshire, UK 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

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Frequently asked questions

How often is air quality information updated for Letchworth, Hertfordshire?

The air quality information for Letchworth, Hertfordshire is updated every hour for accuracy.

What time in the last 24 hours was the air quality in Letchworth, Hertfordshire at its worst?

In the past 24 hours, the air quality in Letchworth, Hertfordshire was at its worst at 06:00:00 on 2025-11-06.

When did Letchworth, Hertfordshire experience the best air quality in the last 24 hours?

In the last 24 hours, the best air quality in Letchworth, Hertfordshire was observed at 09:00:00 on 2025-11-05.

What is the AQI in Letchworth, Hertfordshire right now?

As of now, the AQI in Letchworth, Hertfordshire is 33, indicating Good conditions.

What is the most common type of pollution in Letchworth, Hertfordshire?

Letchworth, Hertfordshire air has the highest levels of PM2.5.

What should I do in case of poor air quality in Letchworth, Hertfordshire?

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

What is the PM_2.5 level in Letchworth, Hertfordshire at the moment?

PM_2.5 levels in Letchworth, Hertfordshire are currently 6.46 μg/m³.

What is the PM₁₀ level in Letchworth, Hertfordshire at the moment?

The PM₁₀ concentration in Letchworth, Hertfordshire is 21.208 μg/m³ at the moment.

What is the carbon monoxide (CO) level in Letchworth, Hertfordshire at the moment?

The current carbon monoxide (CO) concentration in Letchworth, Hertfordshire is 0.014 ppm.

What is the sulfur dioxide (SO₂) level in Letchworth, Hertfordshire at the moment?

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO₂) concentration of 0.735 ppb.

What is the ozone (O₃) level in Letchworth, Hertfordshire at the moment?

The current ozone (O₃) level in Letchworth, Hertfordshire at the moment is 15.361 ppm.

What is the nitrogen dioxide (NO₂) level in Letchworth, Hertfordshire at the moment?

Nitrogen dioxide (NO₂) level in Letchworth, Hertfordshire at the moment is 10.5 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-11-06T05:00:00.000Z	38 \| good	6.691 \| good	8.727 \| good	23.152 \| good	0.279 \| good	3.93 \| good	0.119 \| good
2025-11-06T06:00:00.000Z	44 \| good	7.696 \| good	26.308 \| good	13.592 \| good	0.544 \| good	7.663 \| good	0.011 \| good
2025-11-06T07:00:00.000Z	38 \| good	6.792 \| good	21.785 \| good	16.46 \| good	0.939 \| good	8.205 \| good	0.603 \| good
2025-11-06T08:00:00.000Z	33 \| good	6.46 \| good	21.208 \| good	15.361 \| good	0.735 \| good	10.5 \| good	0.014 \| good
2025-11-06T09:00:00.000Z	33 \| good	5.89 \| good	19.757 \| good	16.331 \| good	1.068 \| good	16.917 \| good	0.514 \| good
2025-11-06T10:00:00.000Z	44 \| good	7.712 \| good	22.527 \| good	14.863 \| good	0.872 \| good	12.86 \| good	0.01 \| good
2025-11-06T11:00:00.000Z	44 \| good	7.672 \| good	21.949 \| good	16.149 \| good	0.619 \| good	13.17 \| good	0.01 \| good
2025-11-06T12:00:00.000Z	38 \| good	7.425 \| good	17.08 \| good	16.198 \| good	0.704 \| good	16.585 \| good	0.007 \| good
2025-11-06T13:00:00.000Z	44 \| good	7.757 \| good	22.965 \| good	14.602 \| good	0.842 \| good	10.404 \| good	0.006 \| good
2025-11-06T14:00:00.000Z	33 \| good	6.495 \| good	21.685 \| good	17.007 \| good	1.042 \| good	9.234 \| good	0.006 \| good
2025-11-06T15:00:00.000Z	33 \| good	6.185 \| good	20.911 \| good	14.303 \| good	0.996 \| good	13.676 \| good	0.007 \| good
2025-11-06T16:00:00.000Z	33 \| good	5.856 \| good	14.86 \| good	20.19 \| good	0.927 \| good	13.215 \| good	0.01 \| good
2025-11-06T17:00:00.000Z	33 \| good	5.508 \| good	21.905 \| good	21.42 \| good	0.936 \| good	14.027 \| good	0.018 \| good
2025-11-06T18:00:00.000Z	44 \| good	7.726 \| good	21.88 \| good	20.872 \| good	0.907 \| good	10.404 \| good	0.019 \| good
2025-11-06T19:00:00.000Z	33 \| good	6.489 \| good	23.733 \| good	21.326 \| good	1.088 \| good	10.543 \| good	0.021 \| good
2025-11-06T20:00:00.000Z	33 \| good	5.686 \| good	27.564 \| good	17.43 \| good	0.848 \| good	10.88 \| good	0.024 \| good
2025-11-06T21:00:00.000Z	38 \| good	7.46 \| good	33.329 \| good	16.212 \| good	0.833 \| good	14.65 \| good	0.019 \| good
2025-11-06T22:00:00.000Z	44 \| good	7.702 \| good	15.382 \| good	17.823 \| good	1.088 \| good	20.747 \| good	0.022 \| good
2025-11-06T23:00:00.000Z	44 \| good	7.585 \| good	19.424 \| good	15.257 \| good	0.745 \| good	15.591 \| good	0.025 \| good
2025-11-07T00:00:00.000Z	38 \| good	7.122 \| good	35.577 \| good	12.932 \| good	1.361 \| good	16.957 \| good	0.553 \| good
2025-11-07T01:00:00.000Z	44 \| good	7.788 \| good	17.629 \| good	10.039 \| good	1.455 \| good	13.599 \| good	0.485 \| good
2025-11-07T02:00:00.000Z	49 \| good	8.567 \| good	21.901 \| good	8.07 \| good	1.296 \| good	12.174 \| good	0.441 \| good
2025-11-07T03:00:00.000Z	44 \| good	8.015 \| good	31.474 \| good	8.749 \| good	1.869 \| good	9.882 \| good	0.401 \| good
2025-11-07T04:00:00.000Z	60 \| moderate	13.503 \| fine	46.101 \| good	6.461 \| good	2.316 \| good	7.338 \| good	0.34 \| good
2025-11-07T05:00:00.000Z	52 \| moderate	10.13 \| good	40.527 \| good	13.564 \| good	2.011 \| good	9.86 \| good	0.338 \| good
2025-11-07T06:00:00.000Z	44 \| good	8.173 \| good	22.327 \| good	11.107 \| good	1.974 \| good	9.244 \| good	0.009 \| good
2025-11-07T07:00:00.000Z	38 \| good	6.673 \| good	13.078 \| good	16.111 \| good	2.091 \| good	9.59 \| good	0.014 \| good
2025-11-07T08:00:00.000Z	54 \| moderate	11.341 \| good	14.497 \| good	12.734 \| good	0.715 \| good	9.024 \| good	0.011 \| good
2025-11-07T09:00:00.000Z	54 \| moderate	10.988 \| good	12.685 \| good	14.531 \| good	0.561 \| good	11.192 \| good	0.143 \| good
2025-11-07T10:00:00.000Z	52 \| moderate	9.812 \| good	11.336 \| good	14.87 \| good	0.563 \| good	10.744 \| good	0.14 \| good
2025-11-07T11:00:00.000Z	49 \| good	8.761 \| good	9.971 \| good	15.399 \| good	0.653 \| good	11.137 \| good	0.142 \| good
2025-11-07T12:00:00.000Z	38 \| good	7.108 \| good	8.989 \| good	16.657 \| good	0.535 \| good	9.361 \| good	0.146 \| good
2025-11-07T13:00:00.000Z	52 \| moderate	9.544 \| good	27.92 \| good	15.735 \| good	0.519 \| good	15.793 \| good	0.009 \| good
2025-11-07T14:00:00.000Z	56 \| moderate	12.3 \| fine	31.505 \| good	17.759 \| good	0.519 \| good	13.111 \| good	0.012 \| good
2025-11-07T15:00:00.000Z	52 \| moderate	10.204 \| good	17.52 \| good	19.47 \| good	0.525 \| good	11.95 \| good	0.012 \| good
2025-11-07T16:00:00.000Z	44 \| good	8.139 \| good	19.04 \| good	17.065 \| good	0.641 \| good	10 \| good	0.013 \| good
2025-11-07T17:00:00.000Z	49 \| good	8.934 \| good	23.89 \| good	17.958 \| good	0.583 \| good	9.574 \| good	0.015 \| good
2025-11-07T18:00:00.000Z	33 \| good	5.979 \| good	21.138 \| good	19.875 \| good	2.028 \| good	9.574 \| good	0.02 \| good
2025-11-07T19:00:00.000Z	52 \| moderate	9.92 \| good	26.938 \| good	20.8 \| good	2.015 \| good	9.681 \| good	0.025 \| good
2025-11-07T20:00:00.000Z	52 \| moderate	10.4 \| good	25.559 \| good	21.93 \| good	0.559 \| good	13.955 \| good	0.022 \| good
2025-11-07T21:00:00.000Z	49 \| good	8.793 \| good	31.268 \| good	18.051 \| good	0.492 \| good	15.244 \| good	0.022 \| good
2025-11-07T22:00:00.000Z	56 \| moderate	12.3 \| fine	20.975 \| good	18.827 \| good	0.509 \| good	9.894 \| good	0.025 \| good
2025-11-07T23:00:00.000Z	52 \| moderate	10.453 \| good	20.657 \| good	20.936 \| good	0.415 \| good	11.842 \| good	0.035 \| good
2025-11-08T00:00:00.000Z	49 \| good	8.768 \| good	31.685 \| good	19.32 \| good	1.707 \| good	8.481 \| good	0.861 \| good
2025-11-08T01:00:00.000Z	44 \| good	7.74 \| good	18.757 \| good	19.944 \| good	1.908 \| good	7.504 \| good	0.441 \| good
2025-11-08T02:00:00.000Z	27 \| good	5.028 \| good	26.677 \| good	20.076 \| good	1.548 \| good	4.17 \| good	0.332 \| good
2025-11-08T03:00:00.000Z	38 \| good	7.055 \| good	32.4 \| good	21.842 \| good	1.786 \| good	4.468 \| good	0.296 \| good
2025-11-08T04:00:00.000Z	38 \| good	7.055 \| good	32.4 \| good	21.842 \| good	1.786 \| good	4.468 \| good	0.296 \| good

Live air quality index in Letchworth, Hertfordshire today

Major air pollutants in Letchworth, Hertfordshire

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Letchworth, Hertfordshire air quality forecast and history

Get reliable air quality data to drive your business

Letchworth, Hertfordshire air quality map: Stay updated on AQI near you

Air quality in nearby cities

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How accurate is Hertfordshire, UK air quality data?

Air quality levels in UK

Frequently asked questions

How often is air quality information updated for Letchworth, Hertfordshire?

What time in the last 24 hours was the air quality in Letchworth, Hertfordshire at its worst?

When did Letchworth, Hertfordshire experience the best air quality in the last 24 hours?

What is the AQI in Letchworth, Hertfordshire right now?

What is the most common type of pollution in Letchworth, Hertfordshire?

What should I do in case of poor air quality in Letchworth, Hertfordshire?

What is the PM2.5 level in Letchworth, Hertfordshire at the moment?

What is the PM10 level in Letchworth, Hertfordshire at the moment?

What is the carbon monoxide (CO) level in Letchworth, Hertfordshire at the moment?

What is the sulfur dioxide (SO2) level in Letchworth, Hertfordshire at the moment?

What is the ozone (O3) level in Letchworth, Hertfordshire at the moment?

What is the nitrogen dioxide (NO2) level in Letchworth, Hertfordshire at the moment?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the PM_2.5 level in Letchworth, Hertfordshire at the moment?

What is the PM₁₀ level in Letchworth, Hertfordshire at the moment?

What is the sulfur dioxide (SO₂) level in Letchworth, Hertfordshire at the moment?

What is the ozone (O₃) level in Letchworth, Hertfordshire at the moment?

What is the nitrogen dioxide (NO₂) level in Letchworth, Hertfordshire at the moment?