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

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO2) concentration of 0.437 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 20.016 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 4.894 ppb.

Live air quality index in Letchworth, Hertfordshire today

Name: Live air pollution levels in Letchworth, Hertfordshire today
Creator: Ambee

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)

3.42 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

7.09 μg/m³

155

255

425

605+

Ozone (O₃)

24.38 ppb

201

201+

Sulfur Dioxide (SO₂)

0.38 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

1.41 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.20 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

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
2025-09-16T04:00:00.000Z	33 \| good	5.617 \| good	18.31 \| good	25.341 \| good	0.43 \| good	2.124 \| good	0.364 \| good
2025-09-16T05:00:00.000Z	33 \| good	6.129 \| good	16.803 \| good	24.143 \| good	0.352 \| good	2.125 \| good	0.321 \| good
2025-09-16T06:00:00.000Z	38 \| good	6.617 \| good	16.79 \| good	24.951 \| good	0.353 \| good	2.703 \| good	0.022 \| good
2025-09-16T07:00:00.000Z	33 \| good	6.033 \| good	22.378 \| good	25.963 \| good	0.353 \| good	3.077 \| good	0.024 \| good
2025-09-16T08:00:00.000Z	33 \| good	5.866 \| good	19.691 \| good	24.889 \| good	0.353 \| good	5.585 \| good	0.022 \| good
2025-09-16T09:00:00.000Z	22 \| good	4.411 \| good	14.971 \| good	24.179 \| good	0.463 \| good	6.436 \| good	0.021 \| good
2025-09-16T10:00:00.000Z	27 \| good	4.663 \| good	24.556 \| good	25.141 \| good	0.434 \| good	5.674 \| good	0.021 \| good
2025-09-16T11:00:00.000Z	27 \| good	4.646 \| good	15.896 \| good	23.014 \| good	0.432 \| good	5.696 \| good	0.02 \| good
2025-09-16T12:00:00.000Z	27 \| good	4.657 \| good	16.541 \| good	24.096 \| good	0.469 \| good	3.59 \| good	0.019 \| good
2025-09-16T13:00:00.000Z	25 \| good	4.331 \| good	26.562 \| good	23.097 \| good	0.427 \| good	5.249 \| good	0.018 \| good
2025-09-16T14:00:00.000Z	25 \| good	4.199 \| good	17 \| good	27.335 \| good	0.469 \| good	5.528 \| good	0.018 \| good
2025-09-16T15:00:00.000Z	27 \| good	5.173 \| good	11.656 \| good	28.166 \| good	0.433 \| good	6.37 \| good	0.019 \| good
2025-09-16T16:00:00.000Z	33 \| good	5.611 \| good	15.029 \| good	27.435 \| good	0.506 \| good	6.371 \| good	0.018 \| good
2025-09-16T17:00:00.000Z	28 \| good	4.522 \| good	16.058 \| good	29.603 \| good	0.508 \| good	6.551 \| good	0.018 \| good
2025-09-16T18:00:00.000Z	28 \| good	4.311 \| good	13.772 \| good	30.329 \| good	0.39 \| good	6.84 \| good	0.02 \| good
2025-09-16T19:00:00.000Z	28 \| good	4.576 \| good	14.004 \| good	29.551 \| good	0.426 \| good	8.984 \| good	0.021 \| good
2025-09-16T20:00:00.000Z	27 \| good	5.32 \| good	12.133 \| good	29.009 \| good	0.354 \| good	7.622 \| good	0.021 \| good
2025-09-16T21:00:00.000Z	27 \| good	4.585 \| good	10.609 \| good	28.667 \| good	0.43 \| good	9.269 \| good	0.021 \| good
2025-09-16T22:00:00.000Z	24 \| good	4.301 \| good	10.641 \| good	25.772 \| good	0.39 \| good	8.074 \| good	0.017 \| good
2025-09-16T23:00:00.000Z	27 \| good	4.534 \| good	13.084 \| good	27.613 \| good	0.352 \| good	7.814 \| good	0.018 \| good
2025-09-17T00:00:00.000Z	23 \| good	4.419 \| good	15.238 \| good	25.15 \| good	0.434 \| good	5.331 \| good	0.29 \| good
2025-09-17T01:00:00.000Z	22 \| good	3.637 \| good	16.292 \| good	23.049 \| good	0.428 \| good	3.239 \| good	0.339 \| good
2025-09-17T02:00:00.000Z	22 \| good	4.022 \| good	12.616 \| good	21.437 \| good	0.429 \| good	2.782 \| good	0.312 \| good
2025-09-17T03:00:00.000Z	27 \| good	5.348 \| good	9.977 \| good	21.673 \| good	0.429 \| good	3.748 \| good	0.361 \| good
2025-09-17T04:00:00.000Z	27 \| good	4.721 \| good	10.041 \| good	20.016 \| good	0.437 \| good	4.894 \| good	0.37 \| good
2025-09-17T05:00:00.000Z	22 \| good	4.447 \| good	14.056 \| good	19.441 \| good	0.352 \| good	4.738 \| good	0.445 \| good
2025-09-17T06:00:00.000Z	18 \| good	3 \| good	13.544 \| good	19.208 \| good	0.352 \| good	7.481 \| good	0.017 \| good
2025-09-17T07:00:00.000Z	22 \| good	3.842 \| good	13.51 \| good	19.51 \| good	0.352 \| good	8.249 \| good	0.019 \| good
2025-09-17T08:00:00.000Z	27 \| good	4.548 \| good	13.9 \| good	19.51 \| good	0.352 \| good	4.774 \| good	0.017 \| good
2025-09-17T09:00:00.000Z	22 \| good	3.778 \| good	14.418 \| good	19.714 \| good	0.351 \| good	5.81 \| good	0.017 \| good
2025-09-17T10:00:00.000Z	22 \| good	3.952 \| good	14.443 \| good	23.119 \| good	0.36 \| good	6.224 \| good	0.016 \| good
2025-09-17T11:00:00.000Z	22 \| good	3.694 \| good	13.884 \| good	20.327 \| good	0.359 \| good	7.192 \| good	0.016 \| good
2025-09-17T12:00:00.000Z	22 \| good	3.992 \| good	14.003 \| good	21.617 \| good	0.36 \| good	5.718 \| good	0.016 \| good
2025-09-17T13:00:00.000Z	18 \| good	3.052 \| good	12.415 \| good	18.668 \| good	0.359 \| good	4.887 \| good	0.017 \| good
2025-09-17T14:00:00.000Z	18 \| good	3.052 \| good	11.909 \| good	18.794 \| good	0.472 \| good	5.653 \| good	0.016 \| good
2025-09-17T15:00:00.000Z	19 \| good	3.299 \| good	9.987 \| good	21.245 \| good	0.472 \| good	3.826 \| good	0.016 \| good
2025-09-17T16:00:00.000Z	20 \| good	3.371 \| good	8.812 \| good	21.755 \| good	0.471 \| good	4.364 \| good	0.016 \| good
2025-09-17T17:00:00.000Z	23 \| good	3.486 \| good	9.537 \| good	24.773 \| good	0.655 \| good	5.604 \| good	0.018 \| good
2025-09-17T18:00:00.000Z	22 \| good	3.599 \| good	9.455 \| good	23.319 \| good	0.472 \| good	4.753 \| good	0.017 \| good
2025-09-17T19:00:00.000Z	22 \| good	3.822 \| good	9.382 \| good	21.551 \| good	0.472 \| good	4.933 \| good	0.017 \| good
2025-09-17T20:00:00.000Z	22 \| good	4.211 \| good	9.516 \| good	21.653 \| good	0.36 \| good	4.187 \| good	0.018 \| good
2025-09-17T21:00:00.000Z	20 \| good	3.331 \| good	8.884 \| good	21.857 \| good	0.397 \| good	4.358 \| good	0.02 \| good
2025-09-17T22:00:00.000Z	23 \| good	3.954 \| good	7.861 \| good	24.518 \| good	0.359 \| good	3.071 \| good	0.013 \| good
2025-09-17T23:00:00.000Z	27 \| good	4.865 \| good	7.411 \| good	23.137 \| good	0.359 \| good	3.2 \| good	0.012 \| good
2025-09-18T00:00:00.000Z	22 \| good	2.681 \| good	9.354 \| good	24.473 \| good	0.382 \| good	2.902 \| good	0.256 \| good
2025-09-18T01:00:00.000Z	23 \| good	2.998 \| good	6.9 \| good	25.013 \| good	0.382 \| good	4.578 \| good	0.198 \| good
2025-09-18T02:00:00.000Z	22 \| good	3.425 \| good	7.092 \| good	24.381 \| good	0.382 \| good	1.412 \| good	0.195 \| good
2025-09-18T03:00:00.000Z	23 \| good	3.122 \| good	7.109 \| good	24.543 \| good	0.382 \| good	1.405 \| good	0.193 \| good
2025-09-18T03:00:00.000Z	22 \| good	3.425 \| good	7.092 \| good	24.381 \| good	0.382 \| good	1.412 \| good	0.195 \| good
2025-09-17T05:00:00.000Z	23 \| good	3.2 \| good	4.307 \| good	25.42 \| good	0.126 \| good	2.549 \| good	0.123 \| good
2025-09-17T06:00:00.000Z	25 \| good	3.121 \| good	4.56 \| good	26.8 \| good	0.157 \| good	3.554 \| good	0.119 \| good
2025-09-17T07:00:00.000Z	27 \| good	3.285 \| good	5.056 \| good	28.605 \| good	0.178 \| good	5.023 \| good	0.121 \| good
2025-09-17T08:00:00.000Z	27 \| good	3.763 \| good	5.887 \| good	28.975 \| good	0.169 \| good	5.283 \| good	0.121 \| good
2025-09-17T09:00:00.000Z	30 \| good	4.326 \| good	6.649 \| good	31.967 \| good	0.163 \| good	4.436 \| good	0.119 \| good
2025-09-17T10:00:00.000Z	30 \| good	4.479 \| good	7.529 \| good	31.862 \| good	0.126 \| good	3.551 \| good	0.119 \| good
2025-09-17T11:00:00.000Z	30 \| good	4.679 \| good	8.301 \| good	32.474 \| good	0.13 \| good	3.241 \| good	0.118 \| good
2025-09-17T12:00:00.000Z	30 \| good	4.776 \| good	8.91 \| good	32.105 \| good	0.14 \| good	3.243 \| good	0.118 \| good
2025-09-17T13:00:00.000Z	30 \| good	4.825 \| good	9.014 \| good	31.757 \| good	0.132 \| good	3.09 \| good	0.117 \| good
2025-09-17T14:00:00.000Z	29 \| good	4.755 \| good	9.018 \| good	31.454 \| good	0.111 \| good	2.928 \| good	0.116 \| good
2025-09-17T15:00:00.000Z	29 \| good	4.73 \| good	8.985 \| good	31.361 \| good	0.106 \| good	3.038 \| good	0.114 \| good
2025-09-17T16:00:00.000Z	29 \| good	4.808 \| good	8.773 \| good	30.639 \| good	0.103 \| good	3.339 \| good	0.113 \| good
2025-09-17T17:00:00.000Z	28 \| good	4.986 \| good	8.579 \| good	29.688 \| good	0.108 \| good	3.748 \| good	0.114 \| good
2025-09-17T18:00:00.000Z	27 \| good	4.627 \| good	8.669 \| good	29.151 \| good	0.147 \| good	4.534 \| good	0.113 \| good
2025-09-17T19:00:00.000Z	27 \| good	4.733 \| good	8.87 \| good	28.634 \| good	0.155 \| good	3.903 \| good	0.113 \| good
2025-09-17T20:00:00.000Z	27 \| good	4.752 \| good	9.618 \| good	28.524 \| good	0.151 \| good	3.304 \| good	0.111 \| good
2025-09-17T21:00:00.000Z	27 \| good	4.737 \| good	8.939 \| good	28.328 \| good	0.142 \| good	2.815 \| good	0.109 \| good
2025-09-17T22:00:00.000Z	27 \| good	4.686 \| good	8.49 \| good	27.954 \| good	0.126 \| good	2.451 \| good	0.108 \| good
2025-09-17T23:00:00.000Z	27 \| good	4.619 \| good	8.301 \| good	27.588 \| good	0.078 \| good	2.251 \| good	0.107 \| good
2025-09-18T00:00:00.000Z	27 \| good	4.583 \| good	8.414 \| good	27.459 \| good	0.065 \| good	1.939 \| good	0.105 \| good
2025-09-18T01:00:00.000Z	27 \| good	4.578 \| good	8.679 \| good	25.91 \| good	0.055 \| good	1.72 \| good	0.104 \| good
2025-09-18T02:00:00.000Z	23 \| good	4.318 \| good	8.064 \| good	25.414 \| good	0.047 \| good	1.488 \| good	0.102 \| good
2025-09-18T03:00:00.000Z	23 \| good	4.051 \| good	7.521 \| good	25.332 \| good	0.045 \| good	1.267 \| good	0.101 \| good
2025-09-18T04:00:00.000Z	23 \| good	3.829 \| good	7.083 \| good	24.914 \| good	0.045 \| good	1.173 \| good	0.101 \| good
2025-09-18T05:00:00.000Z	23 \| good	3.576 \| good	6.682 \| good	25.065 \| good	0.065 \| good	1.235 \| good	0.1 \| good
2025-09-18T06:00:00.000Z	22 \| good	3.539 \| good	5.801 \| good	23.949 \| good	0.102 \| good	1.936 \| good	0.102 \| good
2025-09-18T07:00:00.000Z	22 \| good	3.754 \| good	6.28 \| good	22.854 \| good	0.129 \| good	3.276 \| good	0.102 \| good
2025-09-18T08:00:00.000Z	23 \| good	3.824 \| good	6.171 \| good	25.123 \| good	0.107 \| good	3.459 \| good	0.103 \| good
2025-09-18T09:00:00.000Z	24 \| good	3.465 \| good	6.222 \| good	26.255 \| good	0.101 \| good	2.912 \| good	0.105 \| good
2025-09-18T10:00:00.000Z	27 \| good	3.225 \| good	5.741 \| good	29.47 \| good	0.098 \| good	2.253 \| good	0.103 \| good
2025-09-18T11:00:00.000Z	28 \| good	3.076 \| good	5.614 \| good	30.261 \| good	0.09 \| good	1.947 \| good	0.102 \| good
2025-09-18T12:00:00.000Z	29 \| good	2.966 \| good	5.458 \| good	30.769 \| good	0.092 \| good	1.808 \| good	0.101 \| good
2025-09-18T13:00:00.000Z	29 \| good	2.986 \| good	5.521 \| good	31.31 \| good	0.097 \| good	1.748 \| good	0.1 \| good
2025-09-18T14:00:00.000Z	28 \| good	2.969 \| good	5.789 \| good	30.386 \| good	0.096 \| good	1.9 \| good	0.1 \| good
2025-09-18T15:00:00.000Z	28 \| good	3.058 \| good	5.783 \| good	29.702 \| good	0.1 \| good	2.128 \| good	0.101 \| good
2025-09-18T16:00:00.000Z	27 \| good	3.114 \| good	6.473 \| good	29.237 \| good	0.108 \| good	2.574 \| good	0.102 \| good
2025-09-18T17:00:00.000Z	27 \| good	3.284 \| good	6.894 \| good	28.684 \| good	0.117 \| good	3.529 \| good	0.103 \| good
2025-09-18T18:00:00.000Z	25 \| good	3.442 \| good	6.958 \| good	26.923 \| good	0.135 \| good	3.961 \| good	0.105 \| good
2025-09-18T19:00:00.000Z	25 \| good	3.188 \| good	6.149 \| good	26.505 \| good	0.149 \| good	3.926 \| good	0.104 \| good
2025-09-18T20:00:00.000Z	25 \| good	3.153 \| good	5.977 \| good	27.104 \| good	0.149 \| good	3.553 \| good	0.104 \| good
2025-09-18T21:00:00.000Z	25 \| good	3.271 \| good	6 \| good	27.33 \| good	0.147 \| good	3.192 \| good	0.103 \| good
2025-09-18T22:00:00.000Z	26 \| good	3.277 \| good	6.099 \| good	27.687 \| good	0.138 \| good	2.866 \| good	0.102 \| good
2025-09-18T23:00:00.000Z	26 \| good	3.379 \| good	5.731 \| good	27.667 \| good	0.111 \| good	2.474 \| good	0.101 \| good
2025-09-19T00:00:00.000Z	26 \| good	3.252 \| good	5.628 \| good	27.583 \| good	0.091 \| good	2.094 \| good	0.101 \| good
2025-09-19T01:00:00.000Z	25 \| good	3.116 \| good	5.715 \| good	27.395 \| good	0.083 \| good	1.711 \| good	0.099 \| good
2025-09-19T02:00:00.000Z	25 \| good	2.994 \| good	5.687 \| good	27.077 \| good	0.077 \| good	1.532 \| good	0.098 \| good
2025-09-19T03:00:00.000Z	24 \| good	2.994 \| good	5.678 \| good	26.261 \| good	0.079 \| good	1.389 \| good	0.098 \| good
2025-09-19T04:00:00.000Z	24 \| good	3.214 \| good	6.413 \| good	25.877 \| good	0.087 \| good	1.354 \| good	0.1 \| good

Letchworth

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

0.36ppm

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 2025-09-16.

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 02:00:00 on 2025-09-17.

What is the AQI in Letchworth, Hertfordshire right now?

As of now, the AQI in Letchworth, Hertfordshire is 27, 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 4.721 μg/m³.

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

The PM₁₀ concentration in Letchworth, Hertfordshire is 10.041 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 0.37 ppm.

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

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO₂) concentration of 0.437 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 20.016 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 4.894 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-16T04:00:00.000Z	33 \| good	5.617 \| good	18.31 \| good	25.341 \| good	0.43 \| good	2.124 \| good	0.364 \| good
2025-09-16T05:00:00.000Z	33 \| good	6.129 \| good	16.803 \| good	24.143 \| good	0.352 \| good	2.125 \| good	0.321 \| good
2025-09-16T06:00:00.000Z	38 \| good	6.617 \| good	16.79 \| good	24.951 \| good	0.353 \| good	2.703 \| good	0.022 \| good
2025-09-16T07:00:00.000Z	33 \| good	6.033 \| good	22.378 \| good	25.963 \| good	0.353 \| good	3.077 \| good	0.024 \| good
2025-09-16T08:00:00.000Z	33 \| good	5.866 \| good	19.691 \| good	24.889 \| good	0.353 \| good	5.585 \| good	0.022 \| good
2025-09-16T09:00:00.000Z	22 \| good	4.411 \| good	14.971 \| good	24.179 \| good	0.463 \| good	6.436 \| good	0.021 \| good
2025-09-16T10:00:00.000Z	27 \| good	4.663 \| good	24.556 \| good	25.141 \| good	0.434 \| good	5.674 \| good	0.021 \| good
2025-09-16T11:00:00.000Z	27 \| good	4.646 \| good	15.896 \| good	23.014 \| good	0.432 \| good	5.696 \| good	0.02 \| good
2025-09-16T12:00:00.000Z	27 \| good	4.657 \| good	16.541 \| good	24.096 \| good	0.469 \| good	3.59 \| good	0.019 \| good
2025-09-16T13:00:00.000Z	25 \| good	4.331 \| good	26.562 \| good	23.097 \| good	0.427 \| good	5.249 \| good	0.018 \| good
2025-09-16T14:00:00.000Z	25 \| good	4.199 \| good	17 \| good	27.335 \| good	0.469 \| good	5.528 \| good	0.018 \| good
2025-09-16T15:00:00.000Z	27 \| good	5.173 \| good	11.656 \| good	28.166 \| good	0.433 \| good	6.37 \| good	0.019 \| good
2025-09-16T16:00:00.000Z	33 \| good	5.611 \| good	15.029 \| good	27.435 \| good	0.506 \| good	6.371 \| good	0.018 \| good
2025-09-16T17:00:00.000Z	28 \| good	4.522 \| good	16.058 \| good	29.603 \| good	0.508 \| good	6.551 \| good	0.018 \| good
2025-09-16T18:00:00.000Z	28 \| good	4.311 \| good	13.772 \| good	30.329 \| good	0.39 \| good	6.84 \| good	0.02 \| good
2025-09-16T19:00:00.000Z	28 \| good	4.576 \| good	14.004 \| good	29.551 \| good	0.426 \| good	8.984 \| good	0.021 \| good
2025-09-16T20:00:00.000Z	27 \| good	5.32 \| good	12.133 \| good	29.009 \| good	0.354 \| good	7.622 \| good	0.021 \| good
2025-09-16T21:00:00.000Z	27 \| good	4.585 \| good	10.609 \| good	28.667 \| good	0.43 \| good	9.269 \| good	0.021 \| good
2025-09-16T22:00:00.000Z	24 \| good	4.301 \| good	10.641 \| good	25.772 \| good	0.39 \| good	8.074 \| good	0.017 \| good
2025-09-16T23:00:00.000Z	27 \| good	4.534 \| good	13.084 \| good	27.613 \| good	0.352 \| good	7.814 \| good	0.018 \| good
2025-09-17T00:00:00.000Z	23 \| good	4.419 \| good	15.238 \| good	25.15 \| good	0.434 \| good	5.331 \| good	0.29 \| good
2025-09-17T01:00:00.000Z	22 \| good	3.637 \| good	16.292 \| good	23.049 \| good	0.428 \| good	3.239 \| good	0.339 \| good
2025-09-17T02:00:00.000Z	22 \| good	4.022 \| good	12.616 \| good	21.437 \| good	0.429 \| good	2.782 \| good	0.312 \| good
2025-09-17T03:00:00.000Z	27 \| good	5.348 \| good	9.977 \| good	21.673 \| good	0.429 \| good	3.748 \| good	0.361 \| good
2025-09-17T04:00:00.000Z	27 \| good	4.721 \| good	10.041 \| good	20.016 \| good	0.437 \| good	4.894 \| good	0.37 \| good
2025-09-17T05:00:00.000Z	22 \| good	4.447 \| good	14.056 \| good	19.441 \| good	0.352 \| good	4.738 \| good	0.445 \| good
2025-09-17T06:00:00.000Z	18 \| good	3 \| good	13.544 \| good	19.208 \| good	0.352 \| good	7.481 \| good	0.017 \| good
2025-09-17T07:00:00.000Z	22 \| good	3.842 \| good	13.51 \| good	19.51 \| good	0.352 \| good	8.249 \| good	0.019 \| good
2025-09-17T08:00:00.000Z	27 \| good	4.548 \| good	13.9 \| good	19.51 \| good	0.352 \| good	4.774 \| good	0.017 \| good
2025-09-17T09:00:00.000Z	22 \| good	3.778 \| good	14.418 \| good	19.714 \| good	0.351 \| good	5.81 \| good	0.017 \| good
2025-09-17T10:00:00.000Z	22 \| good	3.952 \| good	14.443 \| good	23.119 \| good	0.36 \| good	6.224 \| good	0.016 \| good
2025-09-17T11:00:00.000Z	22 \| good	3.694 \| good	13.884 \| good	20.327 \| good	0.359 \| good	7.192 \| good	0.016 \| good
2025-09-17T12:00:00.000Z	22 \| good	3.992 \| good	14.003 \| good	21.617 \| good	0.36 \| good	5.718 \| good	0.016 \| good
2025-09-17T13:00:00.000Z	18 \| good	3.052 \| good	12.415 \| good	18.668 \| good	0.359 \| good	4.887 \| good	0.017 \| good
2025-09-17T14:00:00.000Z	18 \| good	3.052 \| good	11.909 \| good	18.794 \| good	0.472 \| good	5.653 \| good	0.016 \| good
2025-09-17T15:00:00.000Z	19 \| good	3.299 \| good	9.987 \| good	21.245 \| good	0.472 \| good	3.826 \| good	0.016 \| good
2025-09-17T16:00:00.000Z	20 \| good	3.371 \| good	8.812 \| good	21.755 \| good	0.471 \| good	4.364 \| good	0.016 \| good
2025-09-17T17:00:00.000Z	23 \| good	3.486 \| good	9.537 \| good	24.773 \| good	0.655 \| good	5.604 \| good	0.018 \| good
2025-09-17T18:00:00.000Z	22 \| good	3.599 \| good	9.455 \| good	23.319 \| good	0.472 \| good	4.753 \| good	0.017 \| good
2025-09-17T19:00:00.000Z	22 \| good	3.822 \| good	9.382 \| good	21.551 \| good	0.472 \| good	4.933 \| good	0.017 \| good
2025-09-17T20:00:00.000Z	22 \| good	4.211 \| good	9.516 \| good	21.653 \| good	0.36 \| good	4.187 \| good	0.018 \| good
2025-09-17T21:00:00.000Z	20 \| good	3.331 \| good	8.884 \| good	21.857 \| good	0.397 \| good	4.358 \| good	0.02 \| good
2025-09-17T22:00:00.000Z	23 \| good	3.954 \| good	7.861 \| good	24.518 \| good	0.359 \| good	3.071 \| good	0.013 \| good
2025-09-17T23:00:00.000Z	27 \| good	4.865 \| good	7.411 \| good	23.137 \| good	0.359 \| good	3.2 \| good	0.012 \| good
2025-09-18T00:00:00.000Z	22 \| good	2.681 \| good	9.354 \| good	24.473 \| good	0.382 \| good	2.902 \| good	0.256 \| good
2025-09-18T01:00:00.000Z	23 \| good	2.998 \| good	6.9 \| good	25.013 \| good	0.382 \| good	4.578 \| good	0.198 \| good
2025-09-18T02:00:00.000Z	22 \| good	3.425 \| good	7.092 \| good	24.381 \| good	0.382 \| good	1.412 \| good	0.195 \| good
2025-09-18T03:00:00.000Z	23 \| good	3.122 \| good	7.109 \| good	24.543 \| good	0.382 \| good	1.405 \| good	0.193 \| good
2025-09-18T03:00:00.000Z	22 \| good	3.425 \| good	7.092 \| good	24.381 \| good	0.382 \| good	1.412 \| good	0.195 \| good
2025-09-17T05:00:00.000Z	23 \| good	3.2 \| good	4.307 \| good	25.42 \| good	0.126 \| good	2.549 \| good	0.123 \| good
2025-09-17T06:00:00.000Z	25 \| good	3.121 \| good	4.56 \| good	26.8 \| good	0.157 \| good	3.554 \| good	0.119 \| good
2025-09-17T07:00:00.000Z	27 \| good	3.285 \| good	5.056 \| good	28.605 \| good	0.178 \| good	5.023 \| good	0.121 \| good
2025-09-17T08:00:00.000Z	27 \| good	3.763 \| good	5.887 \| good	28.975 \| good	0.169 \| good	5.283 \| good	0.121 \| good
2025-09-17T09:00:00.000Z	30 \| good	4.326 \| good	6.649 \| good	31.967 \| good	0.163 \| good	4.436 \| good	0.119 \| good
2025-09-17T10:00:00.000Z	30 \| good	4.479 \| good	7.529 \| good	31.862 \| good	0.126 \| good	3.551 \| good	0.119 \| good
2025-09-17T11:00:00.000Z	30 \| good	4.679 \| good	8.301 \| good	32.474 \| good	0.13 \| good	3.241 \| good	0.118 \| good
2025-09-17T12:00:00.000Z	30 \| good	4.776 \| good	8.91 \| good	32.105 \| good	0.14 \| good	3.243 \| good	0.118 \| good
2025-09-17T13:00:00.000Z	30 \| good	4.825 \| good	9.014 \| good	31.757 \| good	0.132 \| good	3.09 \| good	0.117 \| good
2025-09-17T14:00:00.000Z	29 \| good	4.755 \| good	9.018 \| good	31.454 \| good	0.111 \| good	2.928 \| good	0.116 \| good
2025-09-17T15:00:00.000Z	29 \| good	4.73 \| good	8.985 \| good	31.361 \| good	0.106 \| good	3.038 \| good	0.114 \| good
2025-09-17T16:00:00.000Z	29 \| good	4.808 \| good	8.773 \| good	30.639 \| good	0.103 \| good	3.339 \| good	0.113 \| good
2025-09-17T17:00:00.000Z	28 \| good	4.986 \| good	8.579 \| good	29.688 \| good	0.108 \| good	3.748 \| good	0.114 \| good
2025-09-17T18:00:00.000Z	27 \| good	4.627 \| good	8.669 \| good	29.151 \| good	0.147 \| good	4.534 \| good	0.113 \| good
2025-09-17T19:00:00.000Z	27 \| good	4.733 \| good	8.87 \| good	28.634 \| good	0.155 \| good	3.903 \| good	0.113 \| good
2025-09-17T20:00:00.000Z	27 \| good	4.752 \| good	9.618 \| good	28.524 \| good	0.151 \| good	3.304 \| good	0.111 \| good
2025-09-17T21:00:00.000Z	27 \| good	4.737 \| good	8.939 \| good	28.328 \| good	0.142 \| good	2.815 \| good	0.109 \| good
2025-09-17T22:00:00.000Z	27 \| good	4.686 \| good	8.49 \| good	27.954 \| good	0.126 \| good	2.451 \| good	0.108 \| good
2025-09-17T23:00:00.000Z	27 \| good	4.619 \| good	8.301 \| good	27.588 \| good	0.078 \| good	2.251 \| good	0.107 \| good
2025-09-18T00:00:00.000Z	27 \| good	4.583 \| good	8.414 \| good	27.459 \| good	0.065 \| good	1.939 \| good	0.105 \| good
2025-09-18T01:00:00.000Z	27 \| good	4.578 \| good	8.679 \| good	25.91 \| good	0.055 \| good	1.72 \| good	0.104 \| good
2025-09-18T02:00:00.000Z	23 \| good	4.318 \| good	8.064 \| good	25.414 \| good	0.047 \| good	1.488 \| good	0.102 \| good
2025-09-18T03:00:00.000Z	23 \| good	4.051 \| good	7.521 \| good	25.332 \| good	0.045 \| good	1.267 \| good	0.101 \| good
2025-09-18T04:00:00.000Z	23 \| good	3.829 \| good	7.083 \| good	24.914 \| good	0.045 \| good	1.173 \| good	0.101 \| good
2025-09-18T05:00:00.000Z	23 \| good	3.576 \| good	6.682 \| good	25.065 \| good	0.065 \| good	1.235 \| good	0.1 \| good
2025-09-18T06:00:00.000Z	22 \| good	3.539 \| good	5.801 \| good	23.949 \| good	0.102 \| good	1.936 \| good	0.102 \| good
2025-09-18T07:00:00.000Z	22 \| good	3.754 \| good	6.28 \| good	22.854 \| good	0.129 \| good	3.276 \| good	0.102 \| good
2025-09-18T08:00:00.000Z	23 \| good	3.824 \| good	6.171 \| good	25.123 \| good	0.107 \| good	3.459 \| good	0.103 \| good
2025-09-18T09:00:00.000Z	24 \| good	3.465 \| good	6.222 \| good	26.255 \| good	0.101 \| good	2.912 \| good	0.105 \| good
2025-09-18T10:00:00.000Z	27 \| good	3.225 \| good	5.741 \| good	29.47 \| good	0.098 \| good	2.253 \| good	0.103 \| good
2025-09-18T11:00:00.000Z	28 \| good	3.076 \| good	5.614 \| good	30.261 \| good	0.09 \| good	1.947 \| good	0.102 \| good
2025-09-18T12:00:00.000Z	29 \| good	2.966 \| good	5.458 \| good	30.769 \| good	0.092 \| good	1.808 \| good	0.101 \| good
2025-09-18T13:00:00.000Z	29 \| good	2.986 \| good	5.521 \| good	31.31 \| good	0.097 \| good	1.748 \| good	0.1 \| good
2025-09-18T14:00:00.000Z	28 \| good	2.969 \| good	5.789 \| good	30.386 \| good	0.096 \| good	1.9 \| good	0.1 \| good
2025-09-18T15:00:00.000Z	28 \| good	3.058 \| good	5.783 \| good	29.702 \| good	0.1 \| good	2.128 \| good	0.101 \| good
2025-09-18T16:00:00.000Z	27 \| good	3.114 \| good	6.473 \| good	29.237 \| good	0.108 \| good	2.574 \| good	0.102 \| good
2025-09-18T17:00:00.000Z	27 \| good	3.284 \| good	6.894 \| good	28.684 \| good	0.117 \| good	3.529 \| good	0.103 \| good
2025-09-18T18:00:00.000Z	25 \| good	3.442 \| good	6.958 \| good	26.923 \| good	0.135 \| good	3.961 \| good	0.105 \| good
2025-09-18T19:00:00.000Z	25 \| good	3.188 \| good	6.149 \| good	26.505 \| good	0.149 \| good	3.926 \| good	0.104 \| good
2025-09-18T20:00:00.000Z	25 \| good	3.153 \| good	5.977 \| good	27.104 \| good	0.149 \| good	3.553 \| good	0.104 \| good
2025-09-18T21:00:00.000Z	25 \| good	3.271 \| good	6 \| good	27.33 \| good	0.147 \| good	3.192 \| good	0.103 \| good
2025-09-18T22:00:00.000Z	26 \| good	3.277 \| good	6.099 \| good	27.687 \| good	0.138 \| good	2.866 \| good	0.102 \| good
2025-09-18T23:00:00.000Z	26 \| good	3.379 \| good	5.731 \| good	27.667 \| good	0.111 \| good	2.474 \| good	0.101 \| good
2025-09-19T00:00:00.000Z	26 \| good	3.252 \| good	5.628 \| good	27.583 \| good	0.091 \| good	2.094 \| good	0.101 \| good
2025-09-19T01:00:00.000Z	25 \| good	3.116 \| good	5.715 \| good	27.395 \| good	0.083 \| good	1.711 \| good	0.099 \| good
2025-09-19T02:00:00.000Z	25 \| good	2.994 \| good	5.687 \| good	27.077 \| good	0.077 \| good	1.532 \| good	0.098 \| good
2025-09-19T03:00:00.000Z	24 \| good	2.994 \| good	5.678 \| good	26.261 \| good	0.079 \| good	1.389 \| good	0.098 \| good
2025-09-19T04:00:00.000Z	24 \| good	3.214 \| good	6.413 \| good	25.877 \| good	0.087 \| good	1.354 \| good	0.1 \| 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

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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

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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?