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

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO2) concentration of 0.631 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 19.762 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 6.101 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 2.794 μg/m3.

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

The PM10 concentration in Letchworth, Hertfordshire is 9.966 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)

3.04 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

10.35 μg/m³

155

255

425

605+

Ozone (O₃)

13.93 ppb

201

201+

Sulfur Dioxide (SO₂)

0.52 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

5.30 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.34 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
2026-10-04T03:00:00.000Z	58 \| moderate	13.448 \| fine	15.364 \| good	8.614 \| good	0.487 \| good	11.071 \| good	0.241 \| good
2026-10-04T04:00:00.000Z	60 \| moderate	13.78 \| fine	17.402 \| good	7.234 \| good	0.382 \| good	16.599 \| good	0.016 \| good
2026-10-04T05:00:00.000Z	56 \| moderate	11.997 \| good	14.825 \| good	5.126 \| good	0.509 \| good	17.503 \| good	0.016 \| good
2026-10-04T06:00:00.000Z	54 \| moderate	11.13 \| good	17.797 \| good	4.706 \| good	0.499 \| good	11.864 \| good	0.017 \| good
2026-10-04T07:00:00.000Z	44 \| good	7.632 \| good	25.626 \| good	3.847 \| good	1.508 \| good	9.737 \| good	0.016 \| good
2026-10-04T08:00:00.000Z	49 \| good	8.639 \| good	27.38 \| good	1.649 \| good	1.879 \| good	6.967 \| good	0.019 \| good
2026-10-04T09:00:00.000Z	38 \| good	7.141 \| good	20.942 \| good	2.5 \| good	0.919 \| good	11.191 \| good	0.019 \| good
2026-10-04T10:00:00.000Z	33 \| good	6.04 \| good	25.586 \| good	3.94 \| good	1.036 \| good	8.043 \| good	0.018 \| good
2026-10-04T11:00:00.000Z	38 \| good	7.011 \| good	15.86 \| good	4.68 \| good	0.947 \| good	8.77 \| good	0.018 \| good
2026-10-04T12:00:00.000Z	38 \| good	6.666 \| good	41.12 \| good	6.94 \| good	0.824 \| good	9.761 \| good	0.017 \| good
2026-10-04T13:00:00.000Z	33 \| good	4.9 \| good	8.861 \| good	36.361 \| good	0.359 \| good	2.546 \| good	0.155 \| good
2026-10-04T14:00:00.000Z	44 \| good	7.616 \| good	19.065 \| good	17.31 \| good	0.833 \| good	9.944 \| good	0.013 \| good
2026-10-04T15:00:00.000Z	38 \| good	7.454 \| good	18.59 \| good	18.988 \| good	0.827 \| good	9.044 \| good	0.012 \| good
2026-10-04T16:00:00.000Z	49 \| good	8.544 \| good	33.235 \| good	11.246 \| good	0.814 \| good	8.387 \| good	0.012 \| good
2026-10-04T17:00:00.000Z	52 \| moderate	9.658 \| good	37.436 \| good	17.701 \| good	0.93 \| good	8 \| good	0.015 \| good
2026-10-04T18:00:00.000Z	44 \| good	8.435 \| good	29.053 \| good	26.203 \| good	0.981 \| good	13.496 \| good	0.015 \| good
2026-10-04T19:00:00.000Z	44 \| good	8.2 \| good	22.099 \| good	19.94 \| good	0.811 \| good	13.178 \| good	0.021 \| good
2026-10-04T20:00:00.000Z	64 \| moderate	16.23 \| fine	18.144 \| good	10.505 \| good	0.536 \| good	8.959 \| good	0.025 \| good
2026-10-04T21:00:00.000Z	52 \| moderate	10.44 \| good	28.444 \| good	20.776 \| good	1.186 \| good	13.415 \| good	0.023 \| good
2026-10-04T22:00:00.000Z	56 \| moderate	11.554 \| good	21.082 \| good	19.247 \| good	0.991 \| good	14.574 \| good	0.027 \| good
2026-10-04T23:00:00.000Z	56 \| moderate	12.027 \| good	24.779 \| good	13.391 \| good	0.889 \| good	11.473 \| good	0.029 \| good
2026-10-05T00:00:00.000Z	33 \| good	5.98 \| good	25.579 \| good	22.081 \| good	0.904 \| good	12.3 \| good	0.328 \| good
2026-10-05T01:00:00.000Z	33 \| good	6.283 \| good	18.704 \| good	21.914 \| good	0.973 \| good	8.507 \| good	0.332 \| good
2026-10-05T02:00:00.000Z	49 \| good	8.77 \| good	12.873 \| good	17.944 \| good	0.815 \| good	6.88 \| good	0.291 \| good
2026-10-05T03:00:00.000Z	44 \| good	8.436 \| good	12.661 \| good	19.869 \| good	0.892 \| good	3.795 \| good	0.277 \| good
2026-10-05T04:00:00.000Z	38 \| good	6.73 \| good	14.343 \| good	12.132 \| good	0.791 \| good	4.026 \| good	0.019 \| good
2026-10-05T05:00:00.000Z	49 \| good	8.606 \| good	22.724 \| good	12.462 \| good	0.841 \| good	3.608 \| good	0.018 \| good
2026-10-05T06:00:00.000Z	44 \| good	8.237 \| good	24.286 \| good	11.914 \| good	0.394 \| good	5.326 \| good	0.02 \| good
2026-10-05T07:00:00.000Z	49 \| good	8.529 \| good	16.725 \| good	16.68 \| good	1.062 \| good	7.064 \| good	0.028 \| good
2026-10-05T08:00:00.000Z	33 \| good	5.692 \| good	20.483 \| good	15.647 \| good	1.036 \| good	9.389 \| good	0.023 \| good
2026-10-05T09:00:00.000Z	44 \| good	8.355 \| good	16.395 \| good	20.854 \| good	0.879 \| good	11.331 \| good	0.026 \| good
2026-10-05T10:00:00.000Z	27 \| good	4.668 \| good	20.076 \| good	19.747 \| good	0.904 \| good	8.316 \| good	0.023 \| good
2026-10-05T11:00:00.000Z	27 \| good	5.444 \| good	16.631 \| good	16.127 \| good	0.912 \| good	7.726 \| good	0.021 \| good
2026-10-05T12:00:00.000Z	27 \| good	4.58 \| good	12.084 \| good	23.681 \| good	0.9 \| good	5.829 \| good	0.02 \| good
2026-10-05T13:00:00.000Z	49 \| good	8.674 \| good	18.757 \| good	18.923 \| good	0.974 \| good	5.727 \| good	0.014 \| good
2026-10-05T14:00:00.000Z	49 \| good	9.335 \| good	15.327 \| good	16.518 \| good	0.912 \| good	8.249 \| good	0.014 \| good
2026-10-05T15:00:00.000Z	33 \| good	6.071 \| good	16.373 \| good	15.992 \| good	0.469 \| good	6.969 \| good	0.013 \| good
2026-10-05T16:00:00.000Z	44 \| good	7.54 \| good	17.941 \| good	20.883 \| good	0.465 \| good	7.027 \| good	0.015 \| good
2026-10-05T17:00:00.000Z	27 \| good	5.292 \| good	22.383 \| good	28.093 \| good	0.545 \| good	8.234 \| good	0.013 \| good
2026-10-05T18:00:00.000Z	44 \| good	7.68 \| good	16.11 \| good	26.842 \| good	0.546 \| good	11.21 \| good	0.022 \| good
2026-10-05T19:00:00.000Z	27 \| good	4.032 \| good	9.389 \| good	28.523 \| good	0.489 \| good	11.586 \| good	0.022 \| good
2026-10-05T20:00:00.000Z	27 \| good	3.145 \| good	10.279 \| good	28.987 \| good	0.476 \| good	11.763 \| good	0.027 \| good
2026-10-05T21:00:00.000Z	25 \| good	2.59 \| good	8.989 \| good	27.058 \| good	0.47 \| good	9.853 \| good	0.028 \| good
2026-10-05T22:00:00.000Z	23 \| good	2.544 \| good	9.546 \| good	25.064 \| good	0.473 \| good	8.102 \| good	0.03 \| good
2026-10-05T23:00:00.000Z	21 \| good	2.709 \| good	10.104 \| good	22.609 \| good	0.557 \| good	7.716 \| good	0.03 \| good
2026-10-06T00:00:00.000Z	19 \| good	2.794 \| good	9.966 \| good	19.762 \| good	0.631 \| good	6.101 \| good	0.389 \| good
2026-10-06T01:00:00.000Z	19 \| good	2.901 \| good	9.974 \| good	20.076 \| good	0.439 \| good	5.288 \| good	0.33 \| good
2026-10-06T02:00:00.000Z	16 \| good	3.039 \| good	10.346 \| good	13.93 \| good	0.523 \| good	5.305 \| good	0.338 \| good
2026-10-06T02:00:00.000Z	16 \| good	3.039 \| good	10.346 \| good	13.93 \| good	0.523 \| good	5.305 \| good	0.338 \| good
2026-10-06T01:00:00.000Z	33 \| good	5.934 \| good	7.588 \| good	19.142 \| good	0.241 \| good	4.852 \| good	0.144 \| good
2026-10-06T02:00:00.000Z	33 \| good	6.272 \| good	7.845 \| good	18.499 \| good	0.233 \| good	3.965 \| good	0.143 \| good
2026-10-06T03:00:00.000Z	33 \| good	6.278 \| good	7.981 \| good	17.947 \| good	0.218 \| good	3.416 \| good	0.143 \| good
2026-10-06T04:00:00.000Z	33 \| good	6.347 \| good	7.602 \| good	17.485 \| good	0.199 \| good	3.449 \| good	0.142 \| good
2026-10-06T05:00:00.000Z	33 \| good	6.448 \| good	7.517 \| good	17.262 \| good	0.238 \| good	4.212 \| good	0.142 \| good
2026-10-06T06:00:00.000Z	38 \| good	6.756 \| good	7.989 \| good	16.111 \| good	0.306 \| good	5.585 \| good	0.144 \| good
2026-10-06T07:00:00.000Z	38 \| good	7.144 \| good	8.705 \| good	15.555 \| good	0.391 \| good	7.312 \| good	0.152 \| good
2026-10-06T08:00:00.000Z	38 \| good	6.663 \| good	7.9 \| good	17.91 \| good	0.344 \| good	7.127 \| good	0.15 \| good
2026-10-06T09:00:00.000Z	22 \| good	4.17 \| good	5.85 \| good	22.658 \| good	0.253 \| good	4.745 \| good	0.139 \| good
2026-10-06T10:00:00.000Z	23 \| good	3.191 \| good	4.96 \| good	25.331 \| good	0.188 \| good	3.406 \| good	0.132 \| good
2026-10-06T11:00:00.000Z	25 \| good	2.674 \| good	4.494 \| good	27.445 \| good	0.173 \| good	2.98 \| good	0.127 \| good
2026-10-06T12:00:00.000Z	28 \| good	2.725 \| good	4.408 \| good	29.69 \| good	0.168 \| good	2.723 \| good	0.123 \| good
2026-10-06T13:00:00.000Z	28 \| good	2.737 \| good	4.367 \| good	30.138 \| good	0.164 \| good	2.655 \| good	0.123 \| good
2026-10-06T14:00:00.000Z	30 \| good	2.799 \| good	4.429 \| good	31.707 \| good	0.159 \| good	2.535 \| good	0.123 \| good
2026-10-06T15:00:00.000Z	30 \| good	2.868 \| good	4.428 \| good	32.423 \| good	0.139 \| good	2.778 \| good	0.123 \| good
2026-10-06T16:00:00.000Z	30 \| good	2.992 \| good	4.654 \| good	32.273 \| good	0.171 \| good	3.425 \| good	0.124 \| good
2026-10-06T17:00:00.000Z	28 \| good	3.162 \| good	5.361 \| good	29.848 \| good	0.254 \| good	4.732 \| good	0.129 \| good
2026-10-06T18:00:00.000Z	23 \| good	3.783 \| good	6.957 \| good	24.628 \| good	0.421 \| good	8.65 \| good	0.133 \| good
2026-10-06T19:00:00.000Z	27 \| good	5.09 \| good	8.56 \| good	20.932 \| good	0.623 \| good	11.706 \| good	0.144 \| good
2026-10-06T20:00:00.000Z	33 \| good	6.121 \| good	9.697 \| good	17.423 \| good	0.751 \| good	13.172 \| good	0.148 \| good
2026-10-06T21:00:00.000Z	38 \| good	7.132 \| good	10.752 \| good	14.728 \| good	0.815 \| good	14.74 \| good	0.154 \| good
2026-10-06T22:00:00.000Z	44 \| good	7.696 \| good	11.531 \| good	11.941 \| good	0.761 \| good	15.693 \| good	0.159 \| good
2026-10-06T23:00:00.000Z	44 \| good	7.83 \| good	11.963 \| good	10.264 \| good	0.591 \| good	14.671 \| good	0.155 \| good
2026-10-07T00:00:00.000Z	44 \| good	8.313 \| good	12.499 \| good	9.444 \| good	0.525 \| good	13.17 \| good	0.152 \| good
2026-10-07T01:00:00.000Z	49 \| good	9.035 \| good	13.376 \| good	9.554 \| good	0.516 \| good	11.901 \| good	0.149 \| good
2026-10-07T02:00:00.000Z	52 \| moderate	9.774 \| good	12.697 \| good	9.057 \| good	0.515 \| good	10.311 \| good	0.145 \| good
2026-10-07T03:00:00.000Z	52 \| moderate	9.754 \| good	11.926 \| good	8.524 \| good	0.472 \| good	8.754 \| good	0.14 \| good
2026-10-07T04:00:00.000Z	54 \| moderate	10.651 \| good	12.429 \| good	8.827 \| good	0.406 \| good	7.339 \| good	0.139 \| good
2026-10-07T05:00:00.000Z	52 \| moderate	10.409 \| good	11.61 \| good	9.909 \| good	0.38 \| good	6.48 \| good	0.138 \| good
2026-10-07T06:00:00.000Z	52 \| moderate	9.573 \| good	11.013 \| good	9.311 \| good	0.368 \| good	6.034 \| good	0.139 \| good
2026-10-07T07:00:00.000Z	38 \| good	6.72 \| good	7.525 \| good	10.574 \| good	0.331 \| good	6.211 \| good	0.14 \| good
2026-10-07T08:00:00.000Z	22 \| good	3.86 \| good	5.73 \| good	13.98 \| good	0.352 \| good	6.298 \| good	0.142 \| good
2026-10-07T09:00:00.000Z	22 \| good	3.772 \| good	4.749 \| good	20.044 \| good	0.329 \| good	5.502 \| good	0.138 \| good
2026-10-07T10:00:00.000Z	20 \| good	3.275 \| good	4.333 \| good	22.214 \| good	0.303 \| good	4.744 \| good	0.138 \| good
2026-10-07T11:00:00.000Z	22 \| good	2.907 \| good	4.294 \| good	24.295 \| good	0.275 \| good	4.257 \| good	0.138 \| good
2026-10-07T12:00:00.000Z	24 \| good	2.936 \| good	4.508 \| good	25.927 \| good	0.242 \| good	3.798 \| good	0.139 \| good
2026-10-07T13:00:00.000Z	25 \| good	3.233 \| good	4.19 \| good	26.885 \| good	0.214 \| good	3.66 \| good	0.142 \| good
2026-10-07T14:00:00.000Z	25 \| good	3.501 \| good	4.461 \| good	27.327 \| good	0.198 \| good	3.674 \| good	0.149 \| good
2026-10-07T15:00:00.000Z	26 \| good	3.369 \| good	5.055 \| good	28.11 \| good	0.205 \| good	4.287 \| good	0.15 \| good
2026-10-07T16:00:00.000Z	26 \| good	3.827 \| good	5.355 \| good	27.605 \| good	0.226 \| good	4.644 \| good	0.149 \| good
2026-10-07T17:00:00.000Z	26 \| good	3.594 \| good	5.562 \| good	28.145 \| good	0.26 \| good	5.279 \| good	0.147 \| good
2026-10-07T18:00:00.000Z	25 \| good	4.093 \| good	6.344 \| good	27.497 \| good	0.309 \| good	5.742 \| good	0.147 \| good
2026-10-07T19:00:00.000Z	27 \| good	4.965 \| good	7.742 \| good	25.961 \| good	0.336 \| good	6.394 \| good	0.146 \| good
2026-10-07T20:00:00.000Z	33 \| good	5.702 \| good	8.939 \| good	23.141 \| good	0.37 \| good	7.206 \| good	0.15 \| good
2026-10-07T21:00:00.000Z	38 \| good	6.54 \| good	9.602 \| good	24.402 \| good	0.369 \| good	6.809 \| good	0.151 \| good
2026-10-07T22:00:00.000Z	33 \| good	5.703 \| good	9.116 \| good	26.731 \| good	0.319 \| good	6.062 \| good	0.149 \| good
2026-10-07T23:00:00.000Z	33 \| good	5.915 \| good	9.49 \| good	27.948 \| good	0.305 \| good	5.223 \| good	0.149 \| good
2026-10-08T00:00:00.000Z	33 \| good	6.18 \| good	10.12 \| good	28.093 \| good	0.292 \| good	4.507 \| good	0.15 \| good

Letchworth

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

0.04ppm

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 02:00:00 on 2026-10-05.

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 11:00:00 on 2026-10-05.

What is the AQI in Letchworth, Hertfordshire right now?

As of now, the AQI in Letchworth, Hertfordshire is 19, indicating Good conditions.

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

Letchworth, Hertfordshire air has the highest levels of O3.

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 2.794 μg/m³.

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

The PM₁₀ concentration in Letchworth, Hertfordshire is 9.966 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 0.389 ppm.

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

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO₂) concentration of 0.631 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 19.762 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 6.101 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-10-04T03:00:00.000Z	58 \| moderate	13.448 \| fine	15.364 \| good	8.614 \| good	0.487 \| good	11.071 \| good	0.241 \| good
2026-10-04T04:00:00.000Z	60 \| moderate	13.78 \| fine	17.402 \| good	7.234 \| good	0.382 \| good	16.599 \| good	0.016 \| good
2026-10-04T05:00:00.000Z	56 \| moderate	11.997 \| good	14.825 \| good	5.126 \| good	0.509 \| good	17.503 \| good	0.016 \| good
2026-10-04T06:00:00.000Z	54 \| moderate	11.13 \| good	17.797 \| good	4.706 \| good	0.499 \| good	11.864 \| good	0.017 \| good
2026-10-04T07:00:00.000Z	44 \| good	7.632 \| good	25.626 \| good	3.847 \| good	1.508 \| good	9.737 \| good	0.016 \| good
2026-10-04T08:00:00.000Z	49 \| good	8.639 \| good	27.38 \| good	1.649 \| good	1.879 \| good	6.967 \| good	0.019 \| good
2026-10-04T09:00:00.000Z	38 \| good	7.141 \| good	20.942 \| good	2.5 \| good	0.919 \| good	11.191 \| good	0.019 \| good
2026-10-04T10:00:00.000Z	33 \| good	6.04 \| good	25.586 \| good	3.94 \| good	1.036 \| good	8.043 \| good	0.018 \| good
2026-10-04T11:00:00.000Z	38 \| good	7.011 \| good	15.86 \| good	4.68 \| good	0.947 \| good	8.77 \| good	0.018 \| good
2026-10-04T12:00:00.000Z	38 \| good	6.666 \| good	41.12 \| good	6.94 \| good	0.824 \| good	9.761 \| good	0.017 \| good
2026-10-04T13:00:00.000Z	33 \| good	4.9 \| good	8.861 \| good	36.361 \| good	0.359 \| good	2.546 \| good	0.155 \| good
2026-10-04T14:00:00.000Z	44 \| good	7.616 \| good	19.065 \| good	17.31 \| good	0.833 \| good	9.944 \| good	0.013 \| good
2026-10-04T15:00:00.000Z	38 \| good	7.454 \| good	18.59 \| good	18.988 \| good	0.827 \| good	9.044 \| good	0.012 \| good
2026-10-04T16:00:00.000Z	49 \| good	8.544 \| good	33.235 \| good	11.246 \| good	0.814 \| good	8.387 \| good	0.012 \| good
2026-10-04T17:00:00.000Z	52 \| moderate	9.658 \| good	37.436 \| good	17.701 \| good	0.93 \| good	8 \| good	0.015 \| good
2026-10-04T18:00:00.000Z	44 \| good	8.435 \| good	29.053 \| good	26.203 \| good	0.981 \| good	13.496 \| good	0.015 \| good
2026-10-04T19:00:00.000Z	44 \| good	8.2 \| good	22.099 \| good	19.94 \| good	0.811 \| good	13.178 \| good	0.021 \| good
2026-10-04T20:00:00.000Z	64 \| moderate	16.23 \| fine	18.144 \| good	10.505 \| good	0.536 \| good	8.959 \| good	0.025 \| good
2026-10-04T21:00:00.000Z	52 \| moderate	10.44 \| good	28.444 \| good	20.776 \| good	1.186 \| good	13.415 \| good	0.023 \| good
2026-10-04T22:00:00.000Z	56 \| moderate	11.554 \| good	21.082 \| good	19.247 \| good	0.991 \| good	14.574 \| good	0.027 \| good
2026-10-04T23:00:00.000Z	56 \| moderate	12.027 \| good	24.779 \| good	13.391 \| good	0.889 \| good	11.473 \| good	0.029 \| good
2026-10-05T00:00:00.000Z	33 \| good	5.98 \| good	25.579 \| good	22.081 \| good	0.904 \| good	12.3 \| good	0.328 \| good
2026-10-05T01:00:00.000Z	33 \| good	6.283 \| good	18.704 \| good	21.914 \| good	0.973 \| good	8.507 \| good	0.332 \| good
2026-10-05T02:00:00.000Z	49 \| good	8.77 \| good	12.873 \| good	17.944 \| good	0.815 \| good	6.88 \| good	0.291 \| good
2026-10-05T03:00:00.000Z	44 \| good	8.436 \| good	12.661 \| good	19.869 \| good	0.892 \| good	3.795 \| good	0.277 \| good
2026-10-05T04:00:00.000Z	38 \| good	6.73 \| good	14.343 \| good	12.132 \| good	0.791 \| good	4.026 \| good	0.019 \| good
2026-10-05T05:00:00.000Z	49 \| good	8.606 \| good	22.724 \| good	12.462 \| good	0.841 \| good	3.608 \| good	0.018 \| good
2026-10-05T06:00:00.000Z	44 \| good	8.237 \| good	24.286 \| good	11.914 \| good	0.394 \| good	5.326 \| good	0.02 \| good
2026-10-05T07:00:00.000Z	49 \| good	8.529 \| good	16.725 \| good	16.68 \| good	1.062 \| good	7.064 \| good	0.028 \| good
2026-10-05T08:00:00.000Z	33 \| good	5.692 \| good	20.483 \| good	15.647 \| good	1.036 \| good	9.389 \| good	0.023 \| good
2026-10-05T09:00:00.000Z	44 \| good	8.355 \| good	16.395 \| good	20.854 \| good	0.879 \| good	11.331 \| good	0.026 \| good
2026-10-05T10:00:00.000Z	27 \| good	4.668 \| good	20.076 \| good	19.747 \| good	0.904 \| good	8.316 \| good	0.023 \| good
2026-10-05T11:00:00.000Z	27 \| good	5.444 \| good	16.631 \| good	16.127 \| good	0.912 \| good	7.726 \| good	0.021 \| good
2026-10-05T12:00:00.000Z	27 \| good	4.58 \| good	12.084 \| good	23.681 \| good	0.9 \| good	5.829 \| good	0.02 \| good
2026-10-05T13:00:00.000Z	49 \| good	8.674 \| good	18.757 \| good	18.923 \| good	0.974 \| good	5.727 \| good	0.014 \| good
2026-10-05T14:00:00.000Z	49 \| good	9.335 \| good	15.327 \| good	16.518 \| good	0.912 \| good	8.249 \| good	0.014 \| good
2026-10-05T15:00:00.000Z	33 \| good	6.071 \| good	16.373 \| good	15.992 \| good	0.469 \| good	6.969 \| good	0.013 \| good
2026-10-05T16:00:00.000Z	44 \| good	7.54 \| good	17.941 \| good	20.883 \| good	0.465 \| good	7.027 \| good	0.015 \| good
2026-10-05T17:00:00.000Z	27 \| good	5.292 \| good	22.383 \| good	28.093 \| good	0.545 \| good	8.234 \| good	0.013 \| good
2026-10-05T18:00:00.000Z	44 \| good	7.68 \| good	16.11 \| good	26.842 \| good	0.546 \| good	11.21 \| good	0.022 \| good
2026-10-05T19:00:00.000Z	27 \| good	4.032 \| good	9.389 \| good	28.523 \| good	0.489 \| good	11.586 \| good	0.022 \| good
2026-10-05T20:00:00.000Z	27 \| good	3.145 \| good	10.279 \| good	28.987 \| good	0.476 \| good	11.763 \| good	0.027 \| good
2026-10-05T21:00:00.000Z	25 \| good	2.59 \| good	8.989 \| good	27.058 \| good	0.47 \| good	9.853 \| good	0.028 \| good
2026-10-05T22:00:00.000Z	23 \| good	2.544 \| good	9.546 \| good	25.064 \| good	0.473 \| good	8.102 \| good	0.03 \| good
2026-10-05T23:00:00.000Z	21 \| good	2.709 \| good	10.104 \| good	22.609 \| good	0.557 \| good	7.716 \| good	0.03 \| good
2026-10-06T00:00:00.000Z	19 \| good	2.794 \| good	9.966 \| good	19.762 \| good	0.631 \| good	6.101 \| good	0.389 \| good
2026-10-06T01:00:00.000Z	19 \| good	2.901 \| good	9.974 \| good	20.076 \| good	0.439 \| good	5.288 \| good	0.33 \| good
2026-10-06T02:00:00.000Z	16 \| good	3.039 \| good	10.346 \| good	13.93 \| good	0.523 \| good	5.305 \| good	0.338 \| good
2026-10-06T02:00:00.000Z	16 \| good	3.039 \| good	10.346 \| good	13.93 \| good	0.523 \| good	5.305 \| good	0.338 \| good
2026-10-06T01:00:00.000Z	33 \| good	5.934 \| good	7.588 \| good	19.142 \| good	0.241 \| good	4.852 \| good	0.144 \| good
2026-10-06T02:00:00.000Z	33 \| good	6.272 \| good	7.845 \| good	18.499 \| good	0.233 \| good	3.965 \| good	0.143 \| good
2026-10-06T03:00:00.000Z	33 \| good	6.278 \| good	7.981 \| good	17.947 \| good	0.218 \| good	3.416 \| good	0.143 \| good
2026-10-06T04:00:00.000Z	33 \| good	6.347 \| good	7.602 \| good	17.485 \| good	0.199 \| good	3.449 \| good	0.142 \| good
2026-10-06T05:00:00.000Z	33 \| good	6.448 \| good	7.517 \| good	17.262 \| good	0.238 \| good	4.212 \| good	0.142 \| good
2026-10-06T06:00:00.000Z	38 \| good	6.756 \| good	7.989 \| good	16.111 \| good	0.306 \| good	5.585 \| good	0.144 \| good
2026-10-06T07:00:00.000Z	38 \| good	7.144 \| good	8.705 \| good	15.555 \| good	0.391 \| good	7.312 \| good	0.152 \| good
2026-10-06T08:00:00.000Z	38 \| good	6.663 \| good	7.9 \| good	17.91 \| good	0.344 \| good	7.127 \| good	0.15 \| good
2026-10-06T09:00:00.000Z	22 \| good	4.17 \| good	5.85 \| good	22.658 \| good	0.253 \| good	4.745 \| good	0.139 \| good
2026-10-06T10:00:00.000Z	23 \| good	3.191 \| good	4.96 \| good	25.331 \| good	0.188 \| good	3.406 \| good	0.132 \| good
2026-10-06T11:00:00.000Z	25 \| good	2.674 \| good	4.494 \| good	27.445 \| good	0.173 \| good	2.98 \| good	0.127 \| good
2026-10-06T12:00:00.000Z	28 \| good	2.725 \| good	4.408 \| good	29.69 \| good	0.168 \| good	2.723 \| good	0.123 \| good
2026-10-06T13:00:00.000Z	28 \| good	2.737 \| good	4.367 \| good	30.138 \| good	0.164 \| good	2.655 \| good	0.123 \| good
2026-10-06T14:00:00.000Z	30 \| good	2.799 \| good	4.429 \| good	31.707 \| good	0.159 \| good	2.535 \| good	0.123 \| good
2026-10-06T15:00:00.000Z	30 \| good	2.868 \| good	4.428 \| good	32.423 \| good	0.139 \| good	2.778 \| good	0.123 \| good
2026-10-06T16:00:00.000Z	30 \| good	2.992 \| good	4.654 \| good	32.273 \| good	0.171 \| good	3.425 \| good	0.124 \| good
2026-10-06T17:00:00.000Z	28 \| good	3.162 \| good	5.361 \| good	29.848 \| good	0.254 \| good	4.732 \| good	0.129 \| good
2026-10-06T18:00:00.000Z	23 \| good	3.783 \| good	6.957 \| good	24.628 \| good	0.421 \| good	8.65 \| good	0.133 \| good
2026-10-06T19:00:00.000Z	27 \| good	5.09 \| good	8.56 \| good	20.932 \| good	0.623 \| good	11.706 \| good	0.144 \| good
2026-10-06T20:00:00.000Z	33 \| good	6.121 \| good	9.697 \| good	17.423 \| good	0.751 \| good	13.172 \| good	0.148 \| good
2026-10-06T21:00:00.000Z	38 \| good	7.132 \| good	10.752 \| good	14.728 \| good	0.815 \| good	14.74 \| good	0.154 \| good
2026-10-06T22:00:00.000Z	44 \| good	7.696 \| good	11.531 \| good	11.941 \| good	0.761 \| good	15.693 \| good	0.159 \| good
2026-10-06T23:00:00.000Z	44 \| good	7.83 \| good	11.963 \| good	10.264 \| good	0.591 \| good	14.671 \| good	0.155 \| good
2026-10-07T00:00:00.000Z	44 \| good	8.313 \| good	12.499 \| good	9.444 \| good	0.525 \| good	13.17 \| good	0.152 \| good
2026-10-07T01:00:00.000Z	49 \| good	9.035 \| good	13.376 \| good	9.554 \| good	0.516 \| good	11.901 \| good	0.149 \| good
2026-10-07T02:00:00.000Z	52 \| moderate	9.774 \| good	12.697 \| good	9.057 \| good	0.515 \| good	10.311 \| good	0.145 \| good
2026-10-07T03:00:00.000Z	52 \| moderate	9.754 \| good	11.926 \| good	8.524 \| good	0.472 \| good	8.754 \| good	0.14 \| good
2026-10-07T04:00:00.000Z	54 \| moderate	10.651 \| good	12.429 \| good	8.827 \| good	0.406 \| good	7.339 \| good	0.139 \| good
2026-10-07T05:00:00.000Z	52 \| moderate	10.409 \| good	11.61 \| good	9.909 \| good	0.38 \| good	6.48 \| good	0.138 \| good
2026-10-07T06:00:00.000Z	52 \| moderate	9.573 \| good	11.013 \| good	9.311 \| good	0.368 \| good	6.034 \| good	0.139 \| good
2026-10-07T07:00:00.000Z	38 \| good	6.72 \| good	7.525 \| good	10.574 \| good	0.331 \| good	6.211 \| good	0.14 \| good
2026-10-07T08:00:00.000Z	22 \| good	3.86 \| good	5.73 \| good	13.98 \| good	0.352 \| good	6.298 \| good	0.142 \| good
2026-10-07T09:00:00.000Z	22 \| good	3.772 \| good	4.749 \| good	20.044 \| good	0.329 \| good	5.502 \| good	0.138 \| good
2026-10-07T10:00:00.000Z	20 \| good	3.275 \| good	4.333 \| good	22.214 \| good	0.303 \| good	4.744 \| good	0.138 \| good
2026-10-07T11:00:00.000Z	22 \| good	2.907 \| good	4.294 \| good	24.295 \| good	0.275 \| good	4.257 \| good	0.138 \| good
2026-10-07T12:00:00.000Z	24 \| good	2.936 \| good	4.508 \| good	25.927 \| good	0.242 \| good	3.798 \| good	0.139 \| good
2026-10-07T13:00:00.000Z	25 \| good	3.233 \| good	4.19 \| good	26.885 \| good	0.214 \| good	3.66 \| good	0.142 \| good
2026-10-07T14:00:00.000Z	25 \| good	3.501 \| good	4.461 \| good	27.327 \| good	0.198 \| good	3.674 \| good	0.149 \| good
2026-10-07T15:00:00.000Z	26 \| good	3.369 \| good	5.055 \| good	28.11 \| good	0.205 \| good	4.287 \| good	0.15 \| good
2026-10-07T16:00:00.000Z	26 \| good	3.827 \| good	5.355 \| good	27.605 \| good	0.226 \| good	4.644 \| good	0.149 \| good
2026-10-07T17:00:00.000Z	26 \| good	3.594 \| good	5.562 \| good	28.145 \| good	0.26 \| good	5.279 \| good	0.147 \| good
2026-10-07T18:00:00.000Z	25 \| good	4.093 \| good	6.344 \| good	27.497 \| good	0.309 \| good	5.742 \| good	0.147 \| good
2026-10-07T19:00:00.000Z	27 \| good	4.965 \| good	7.742 \| good	25.961 \| good	0.336 \| good	6.394 \| good	0.146 \| good
2026-10-07T20:00:00.000Z	33 \| good	5.702 \| good	8.939 \| good	23.141 \| good	0.37 \| good	7.206 \| good	0.15 \| good
2026-10-07T21:00:00.000Z	38 \| good	6.54 \| good	9.602 \| good	24.402 \| good	0.369 \| good	6.809 \| good	0.151 \| good
2026-10-07T22:00:00.000Z	33 \| good	5.703 \| good	9.116 \| good	26.731 \| good	0.319 \| good	6.062 \| good	0.149 \| good
2026-10-07T23:00:00.000Z	33 \| good	5.915 \| good	9.49 \| good	27.948 \| good	0.305 \| good	5.223 \| good	0.149 \| good
2026-10-08T00:00:00.000Z	33 \| good	6.18 \| good	10.12 \| good	28.093 \| good	0.292 \| good	4.507 \| good	0.15 \| 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)

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

Air quality in nearby cities

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Air quality levels in UK

Frequently asked questions

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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?