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

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO2) concentration of 0.814 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 21.892 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 9.221 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 14.205 μg/m3.

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

The PM10 concentration in Letchworth, Hertfordshire is 40.388 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)

Moderate

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)

14.21 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

40.39 μg/m³

155

255

425

605+

Ozone (O₃)

21.89 ppb

201

201+

Sulfur Dioxide (SO₂)

0.81 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

9.22 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.05 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

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
2026-03-05T00:00:00.000Z	71 \| moderate	19.568 \| fine	28.936 \| good	12.942 \| good	0.87 \| good	22.41 \| good	0.719 \| good
2026-03-05T01:00:00.000Z	77 \| moderate	23.381 \| fine	60.416 \| fine	15.384 \| good	0.964 \| good	27.343 \| good	0.525 \| good
2026-03-05T02:00:00.000Z	84 \| moderate	26.878 \| fine	92.998 \| fine	2.748 \| good	0.716 \| good	29.465 \| good	0.495 \| good
2026-03-05T03:00:00.000Z	79 \| moderate	23.623 \| fine	44 \| good	6.92 \| good	0.713 \| good	26.635 \| good	0.44 \| good
2026-03-05T04:00:00.000Z	94 \| moderate	32.12 \| fine	46.2 \| good	4.003 \| good	0.763 \| good	24.376 \| good	0.51 \| good
2026-03-05T05:00:00.000Z	49 \| good	9.3 \| good	42.42 \| good	9.895 \| good	0.844 \| good	25.764 \| good	0.593 \| good
2026-03-05T06:00:00.000Z	96 \| moderate	32.527 \| fine	41.539 \| good	11.81 \| good	0.905 \| good	17.241 \| good	0.501 \| good
2026-03-05T07:00:00.000Z	82 \| moderate	26.207 \| fine	99.125 \| fine	6.397 \| good	0.881 \| good	23.297 \| good	0.037 \| good
2026-03-05T08:00:00.000Z	110 \| sensitive	38.83 \| moderate	91.78 \| fine	12.67 \| good	1.122 \| good	15.004 \| good	0.03 \| good
2026-03-05T09:00:00.000Z	82 \| moderate	25.695 \| fine	39.143 \| good	0.543 \| good	1.353 \| good	27.447 \| good	0.033 \| good
2026-03-05T10:00:00.000Z	96 \| moderate	32.762 \| fine	87.428 \| fine	2.824 \| good	1.519 \| good	24.986 \| good	0.022 \| good
2026-03-05T11:00:00.000Z	112 \| sensitive	40.399 \| moderate	44.9 \| good	1.457 \| good	1.103 \| good	26.606 \| good	0.017 \| good
2026-03-05T12:00:00.000Z	88 \| moderate	28.969 \| fine	72.4 \| fine	3.658 \| good	0.873 \| good	25.651 \| good	0.014 \| good
2026-03-05T13:00:00.000Z	110 \| sensitive	39.179 \| moderate	64.711 \| fine	10.512 \| good	1.283 \| good	29.353 \| good	0.013 \| good
2026-03-05T14:00:00.000Z	90 \| moderate	30.476 \| fine	88.191 \| fine	13.266 \| good	1.124 \| good	18.552 \| good	0.481 \| good
2026-03-05T15:00:00.000Z	90 \| moderate	29.707 \| fine	79.659 \| fine	13.719 \| good	0.941 \| good	14.845 \| good	0.181 \| good
2026-03-05T16:00:00.000Z	94 \| moderate	32.34 \| fine	59.613 \| fine	22.981 \| good	0.915 \| good	4.782 \| good	0.188 \| good
2026-03-05T17:00:00.000Z	92 \| moderate	31.463 \| fine	81.121 \| fine	25.405 \| good	1.065 \| good	8.872 \| good	0.196 \| good
2026-03-05T18:00:00.000Z	90 \| moderate	30.391 \| fine	71.198 \| fine	26.558 \| good	1.012 \| good	11.605 \| good	0.265 \| good
2026-03-05T19:00:00.000Z	75 \| moderate	22.146 \| fine	37.04 \| good	19.611 \| good	0.74 \| good	14.392 \| good	0.198 \| good
2026-03-05T20:00:00.000Z	84 \| moderate	26.834 \| fine	58.143 \| fine	27.029 \| good	1.114 \| good	29.744 \| good	0.596 \| good
2026-03-05T21:00:00.000Z	86 \| moderate	27.679 \| fine	66.877 \| fine	18.64 \| good	0.607 \| good	21.768 \| good	0.057 \| good
2026-03-05T22:00:00.000Z	81 \| moderate	25.206 \| fine	37.42 \| good	15.844 \| good	0.903 \| good	30.824 \| good	0.062 \| good
2026-03-05T23:00:00.000Z	88 \| moderate	29.105 \| fine	68.499 \| fine	14.791 \| good	0.874 \| good	26.904 \| good	0.065 \| good
2026-03-06T00:00:00.000Z	64 \| moderate	16.487 \| fine	48.584 \| good	16.569 \| good	0.886 \| good	26.252 \| good	0.763 \| good
2026-03-06T01:00:00.000Z	81 \| moderate	24.577 \| fine	78.772 \| fine	15.942 \| good	0.64 \| good	23.813 \| good	0.666 \| good
2026-03-06T02:00:00.000Z	81 \| moderate	25.422 \| fine	46.312 \| good	17.051 \| good	0.592 \| good	18.407 \| good	0.555 \| good
2026-03-06T03:00:00.000Z	77 \| moderate	22.7 \| fine	39.972 \| good	16.158 \| good	0.591 \| good	15.03 \| good	0.553 \| good
2026-03-06T04:00:00.000Z	79 \| moderate	23.862 \| fine	65.082 \| fine	14.201 \| good	0.642 \| good	29.989 \| good	0.459 \| good
2026-03-06T05:00:00.000Z	71 \| moderate	19.805 \| fine	38.844 \| good	10.459 \| good	0.646 \| good	26.896 \| good	0.481 \| good
2026-03-06T06:00:00.000Z	69 \| moderate	19.199 \| fine	34.181 \| good	6.382 \| good	0.731 \| good	15.963 \| good	0.483 \| good
2026-03-06T07:00:00.000Z	75 \| moderate	21.761 \| fine	35.134 \| good	5.708 \| good	1.035 \| good	17.615 \| good	0.028 \| good
2026-03-06T08:00:00.000Z	67 \| moderate	18.16 \| fine	43.349 \| good	4.445 \| good	1.058 \| good	13.35 \| good	0.038 \| good
2026-03-06T09:00:00.000Z	77 \| moderate	22.647 \| fine	46.457 \| good	4.728 \| good	0.99 \| good	12.583 \| good	0.038 \| good
2026-03-06T10:00:00.000Z	71 \| moderate	19.63 \| fine	44.92 \| good	6.713 \| good	0.77 \| good	8.994 \| good	0.032 \| good
2026-03-06T11:00:00.000Z	73 \| moderate	20.975 \| fine	59.705 \| fine	7.925 \| good	0.695 \| good	10.057 \| good	0.026 \| good
2026-03-06T12:00:00.000Z	75 \| moderate	21.914 \| fine	34.45 \| good	7.707 \| good	0.633 \| good	9.704 \| good	0.021 \| good
2026-03-06T13:00:00.000Z	69 \| moderate	18.59 \| fine	44.885 \| good	8.097 \| good	0.673 \| good	19.113 \| good	0.016 \| good
2026-03-06T14:00:00.000Z	64 \| moderate	15.501 \| fine	52.457 \| good	11.876 \| good	0.689 \| good	19.333 \| good	0.014 \| good
2026-03-06T15:00:00.000Z	81 \| moderate	25.5 \| fine	41.332 \| good	11.986 \| good	0.585 \| good	18.948 \| good	0.013 \| good
2026-03-06T16:00:00.000Z	77 \| moderate	23.186 \| fine	56.271 \| fine	16.406 \| good	0.741 \| good	11.766 \| good	0.014 \| good
2026-03-06T17:00:00.000Z	67 \| moderate	17.541 \| fine	31.544 \| good	17.798 \| good	0.659 \| good	12.553 \| good	0.017 \| good
2026-03-06T18:00:00.000Z	64 \| moderate	16.066 \| fine	40.36 \| good	20.926 \| good	0.651 \| good	11.953 \| good	0.019 \| good
2026-03-06T19:00:00.000Z	73 \| moderate	20.769 \| fine	44.426 \| good	22.893 \| good	0.685 \| good	11.859 \| good	0.026 \| good
2026-03-06T20:00:00.000Z	69 \| moderate	19.199 \| fine	48.19 \| good	19.527 \| good	0.891 \| good	24.211 \| good	0.061 \| good
2026-03-06T21:00:00.000Z	75 \| moderate	21.656 \| fine	47.946 \| good	19.99 \| good	0.817 \| good	13.997 \| good	0.081 \| good
2026-03-06T22:00:00.000Z	60 \| moderate	14.205 \| fine	40.388 \| good	21.892 \| good	0.814 \| good	9.221 \| good	0.053 \| good
2026-03-06T23:00:00.000Z	82 \| moderate	25.737 \| fine	57.945 \| fine	18.693 \| good	0.678 \| good	8.735 \| good	0.066 \| good
2026-03-06T23:00:00.000Z	60 \| moderate	14.205 \| fine	40.388 \| good	21.892 \| good	0.814 \| good	9.221 \| good	0.053 \| good
2026-03-07T00:00:00.000Z	56 \| moderate	11.963 \| good	14.255 \| good	21.093 \| good	0.445 \| good	6.016 \| good	0.171 \| good
2026-03-07T01:00:00.000Z	52 \| moderate	9.664 \| good	12.527 \| good	25.237 \| good	0.326 \| good	3.545 \| good	0.159 \| good
2026-03-07T02:00:00.000Z	49 \| good	8.708 \| good	11.011 \| good	27.732 \| good	0.219 \| good	2.863 \| good	0.152 \| good
2026-03-07T03:00:00.000Z	38 \| good	7.201 \| good	10.076 \| good	27.848 \| good	0.18 \| good	2.41 \| good	0.15 \| good
2026-03-07T04:00:00.000Z	33 \| good	6.276 \| good	9.851 \| good	27.491 \| good	0.188 \| good	2.154 \| good	0.149 \| good
2026-03-07T05:00:00.000Z	33 \| good	6.254 \| good	9.565 \| good	27.235 \| good	0.185 \| good	2.051 \| good	0.148 \| good
2026-03-07T06:00:00.000Z	33 \| good	6.473 \| good	10.252 \| good	26.254 \| good	0.199 \| good	2.07 \| good	0.147 \| good
2026-03-07T07:00:00.000Z	38 \| good	6.541 \| good	10.57 \| good	26.193 \| good	0.296 \| good	2.488 \| good	0.149 \| good
2026-03-07T08:00:00.000Z	38 \| good	6.684 \| good	10.266 \| good	27.285 \| good	0.351 \| good	3.205 \| good	0.152 \| good
2026-03-07T09:00:00.000Z	38 \| good	6.64 \| good	10.384 \| good	27.799 \| good	0.364 \| good	3.292 \| good	0.151 \| good
2026-03-07T10:00:00.000Z	38 \| good	6.64 \| good	10.684 \| good	29.053 \| good	0.265 \| good	3.205 \| good	0.152 \| good
2026-03-07T11:00:00.000Z	33 \| good	6.12 \| good	11.248 \| good	29.489 \| good	0.235 \| good	3.369 \| good	0.152 \| good
2026-03-07T12:00:00.000Z	33 \| good	5.978 \| good	11.937 \| good	29.192 \| good	0.199 \| good	3.498 \| good	0.153 \| good
2026-03-07T13:00:00.000Z	33 \| good	6.192 \| good	12.497 \| good	29.051 \| good	0.185 \| good	3.568 \| good	0.153 \| good
2026-03-07T14:00:00.000Z	38 \| good	6.994 \| good	12.897 \| good	28.532 \| good	0.201 \| good	3.703 \| good	0.153 \| good
2026-03-07T15:00:00.000Z	44 \| good	7.629 \| good	13.159 \| good	27.417 \| good	0.185 \| good	3.907 \| good	0.154 \| good
2026-03-07T16:00:00.000Z	44 \| good	8.359 \| good	13.635 \| good	26.859 \| good	0.236 \| good	4.395 \| good	0.156 \| good
2026-03-07T17:00:00.000Z	44 \| good	8.456 \| good	15.002 \| good	25.025 \| good	0.28 \| good	4.787 \| good	0.162 \| good
2026-03-07T18:00:00.000Z	49 \| good	8.635 \| good	15.775 \| good	22.895 \| good	0.3 \| good	6.88 \| good	0.168 \| good
2026-03-07T19:00:00.000Z	52 \| moderate	9.818 \| good	16.278 \| good	21.666 \| good	0.363 \| good	7.215 \| good	0.174 \| good
2026-03-07T20:00:00.000Z	54 \| moderate	11.437 \| good	16.794 \| good	22.134 \| good	0.444 \| good	6.985 \| good	0.169 \| good
2026-03-07T21:00:00.000Z	56 \| moderate	11.893 \| good	17.369 \| good	23.216 \| good	0.51 \| good	6.856 \| good	0.166 \| good
2026-03-07T22:00:00.000Z	56 \| moderate	11.757 \| good	18.805 \| good	24.183 \| good	0.49 \| good	6.34 \| good	0.166 \| good
2026-03-07T23:00:00.000Z	56 \| moderate	11.949 \| good	19.87 \| good	24.692 \| good	0.464 \| good	5.731 \| good	0.166 \| good
2026-03-08T00:00:00.000Z	56 \| moderate	12.289 \| fine	19.974 \| good	23.915 \| good	0.441 \| good	5.017 \| good	0.165 \| good
2026-03-08T01:00:00.000Z	58 \| moderate	13.451 \| fine	19.916 \| good	23.463 \| good	0.293 \| good	4.8 \| good	0.166 \| good
2026-03-08T02:00:00.000Z	60 \| moderate	14.258 \| fine	20.805 \| good	22.932 \| good	0.197 \| good	4.467 \| good	0.165 \| good
2026-03-08T03:00:00.000Z	60 \| moderate	14.173 \| fine	20.367 \| good	22.674 \| good	0.133 \| good	3.282 \| good	0.163 \| good
2026-03-08T04:00:00.000Z	60 \| moderate	14.207 \| fine	20.586 \| good	24.29 \| good	0.112 \| good	2.904 \| good	0.16 \| good
2026-03-08T05:00:00.000Z	60 \| moderate	14.466 \| fine	23.091 \| good	24.561 \| good	0.097 \| good	2.411 \| good	0.156 \| good
2026-03-08T06:00:00.000Z	62 \| moderate	14.639 \| fine	23.641 \| good	23.191 \| good	0.16 \| good	2.398 \| good	0.16 \| good
2026-03-08T07:00:00.000Z	62 \| moderate	15.287 \| fine	25.559 \| good	22.219 \| good	0.243 \| good	3.241 \| good	0.161 \| good
2026-03-08T08:00:00.000Z	64 \| moderate	15.879 \| fine	30.263 \| good	23.977 \| good	0.316 \| good	3.769 \| good	0.164 \| good
2026-03-08T09:00:00.000Z	66 \| moderate	16.644 \| fine	34.637 \| good	23.578 \| good	0.336 \| good	3.847 \| good	0.17 \| good
2026-03-08T10:00:00.000Z	64 \| moderate	16.419 \| fine	34.191 \| good	23.927 \| good	0.317 \| good	3.829 \| good	0.179 \| good
2026-03-08T11:00:00.000Z	64 \| moderate	15.706 \| fine	31.335 \| good	23.311 \| good	0.334 \| good	4.218 \| good	0.186 \| good
2026-03-08T12:00:00.000Z	79 \| moderate	23.911 \| fine	32.935 \| good	23.581 \| good	0.332 \| good	4.915 \| good	0.192 \| good
2026-03-08T13:00:00.000Z	88 \| moderate	29.191 \| fine	36.503 \| good	24.882 \| good	0.46 \| good	5.096 \| good	0.196 \| good
2026-03-08T14:00:00.000Z	99 \| moderate	34.943 \| fine	41.513 \| good	28.067 \| good	0.536 \| good	5.198 \| good	0.203 \| good
2026-03-08T15:00:00.000Z	107 \| sensitive	38.019 \| moderate	47.064 \| good	30.139 \| good	0.541 \| good	5.276 \| good	0.214 \| good
2026-03-08T16:00:00.000Z	110 \| sensitive	39.39 \| moderate	52.365 \| good	30.81 \| good	0.498 \| good	6.186 \| good	0.216 \| good
2026-03-08T17:00:00.000Z	112 \| sensitive	39.697 \| moderate	53.195 \| good	25.809 \| good	0.546 \| good	8.778 \| good	0.224 \| good
2026-03-08T18:00:00.000Z	117 \| sensitive	41.795 \| moderate	53.831 \| good	21.299 \| good	0.758 \| good	11.948 \| good	0.238 \| good
2026-03-08T19:00:00.000Z	122 \| sensitive	43.902 \| moderate	56.938 \| fine	15.714 \| good	0.894 \| good	13.087 \| good	0.251 \| good
2026-03-08T20:00:00.000Z	127 \| sensitive	46.106 \| moderate	61.037 \| fine	12.363 \| good	0.781 \| good	14.336 \| good	0.26 \| good
2026-03-08T21:00:00.000Z	137 \| sensitive	50.479 \| moderate	63.808 \| fine	10.191 \| good	0.746 \| good	15.865 \| good	0.276 \| good
2026-03-08T22:00:00.000Z	153 \| unhealthy	57.664 \| poor	67.01 \| fine	11.329 \| good	0.642 \| good	16.205 \| good	0.289 \| good
2026-03-08T23:00:00.000Z	154 \| unhealthy	60.481 \| poor	68.738 \| fine	12.556 \| good	0.565 \| good	15.228 \| good	0.292 \| good

Letchworth

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

0.07ppm

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 11:00:00 on 2026-03-05.

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 10:00:00 on 2026-03-06.

What is the AQI in Letchworth, Hertfordshire right now?

As of now, the AQI in Letchworth, Hertfordshire is 60, indicating Moderate 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 14.205 μg/m³.

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

The PM₁₀ concentration in Letchworth, Hertfordshire is 40.388 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 0.053 ppm.

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

Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO₂) concentration of 0.814 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 21.892 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 9.221 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-03-05T00:00:00.000Z	71 \| moderate	19.568 \| fine	28.936 \| good	12.942 \| good	0.87 \| good	22.41 \| good	0.719 \| good
2026-03-05T01:00:00.000Z	77 \| moderate	23.381 \| fine	60.416 \| fine	15.384 \| good	0.964 \| good	27.343 \| good	0.525 \| good
2026-03-05T02:00:00.000Z	84 \| moderate	26.878 \| fine	92.998 \| fine	2.748 \| good	0.716 \| good	29.465 \| good	0.495 \| good
2026-03-05T03:00:00.000Z	79 \| moderate	23.623 \| fine	44 \| good	6.92 \| good	0.713 \| good	26.635 \| good	0.44 \| good
2026-03-05T04:00:00.000Z	94 \| moderate	32.12 \| fine	46.2 \| good	4.003 \| good	0.763 \| good	24.376 \| good	0.51 \| good
2026-03-05T05:00:00.000Z	49 \| good	9.3 \| good	42.42 \| good	9.895 \| good	0.844 \| good	25.764 \| good	0.593 \| good
2026-03-05T06:00:00.000Z	96 \| moderate	32.527 \| fine	41.539 \| good	11.81 \| good	0.905 \| good	17.241 \| good	0.501 \| good
2026-03-05T07:00:00.000Z	82 \| moderate	26.207 \| fine	99.125 \| fine	6.397 \| good	0.881 \| good	23.297 \| good	0.037 \| good
2026-03-05T08:00:00.000Z	110 \| sensitive	38.83 \| moderate	91.78 \| fine	12.67 \| good	1.122 \| good	15.004 \| good	0.03 \| good
2026-03-05T09:00:00.000Z	82 \| moderate	25.695 \| fine	39.143 \| good	0.543 \| good	1.353 \| good	27.447 \| good	0.033 \| good
2026-03-05T10:00:00.000Z	96 \| moderate	32.762 \| fine	87.428 \| fine	2.824 \| good	1.519 \| good	24.986 \| good	0.022 \| good
2026-03-05T11:00:00.000Z	112 \| sensitive	40.399 \| moderate	44.9 \| good	1.457 \| good	1.103 \| good	26.606 \| good	0.017 \| good
2026-03-05T12:00:00.000Z	88 \| moderate	28.969 \| fine	72.4 \| fine	3.658 \| good	0.873 \| good	25.651 \| good	0.014 \| good
2026-03-05T13:00:00.000Z	110 \| sensitive	39.179 \| moderate	64.711 \| fine	10.512 \| good	1.283 \| good	29.353 \| good	0.013 \| good
2026-03-05T14:00:00.000Z	90 \| moderate	30.476 \| fine	88.191 \| fine	13.266 \| good	1.124 \| good	18.552 \| good	0.481 \| good
2026-03-05T15:00:00.000Z	90 \| moderate	29.707 \| fine	79.659 \| fine	13.719 \| good	0.941 \| good	14.845 \| good	0.181 \| good
2026-03-05T16:00:00.000Z	94 \| moderate	32.34 \| fine	59.613 \| fine	22.981 \| good	0.915 \| good	4.782 \| good	0.188 \| good
2026-03-05T17:00:00.000Z	92 \| moderate	31.463 \| fine	81.121 \| fine	25.405 \| good	1.065 \| good	8.872 \| good	0.196 \| good
2026-03-05T18:00:00.000Z	90 \| moderate	30.391 \| fine	71.198 \| fine	26.558 \| good	1.012 \| good	11.605 \| good	0.265 \| good
2026-03-05T19:00:00.000Z	75 \| moderate	22.146 \| fine	37.04 \| good	19.611 \| good	0.74 \| good	14.392 \| good	0.198 \| good
2026-03-05T20:00:00.000Z	84 \| moderate	26.834 \| fine	58.143 \| fine	27.029 \| good	1.114 \| good	29.744 \| good	0.596 \| good
2026-03-05T21:00:00.000Z	86 \| moderate	27.679 \| fine	66.877 \| fine	18.64 \| good	0.607 \| good	21.768 \| good	0.057 \| good
2026-03-05T22:00:00.000Z	81 \| moderate	25.206 \| fine	37.42 \| good	15.844 \| good	0.903 \| good	30.824 \| good	0.062 \| good
2026-03-05T23:00:00.000Z	88 \| moderate	29.105 \| fine	68.499 \| fine	14.791 \| good	0.874 \| good	26.904 \| good	0.065 \| good
2026-03-06T00:00:00.000Z	64 \| moderate	16.487 \| fine	48.584 \| good	16.569 \| good	0.886 \| good	26.252 \| good	0.763 \| good
2026-03-06T01:00:00.000Z	81 \| moderate	24.577 \| fine	78.772 \| fine	15.942 \| good	0.64 \| good	23.813 \| good	0.666 \| good
2026-03-06T02:00:00.000Z	81 \| moderate	25.422 \| fine	46.312 \| good	17.051 \| good	0.592 \| good	18.407 \| good	0.555 \| good
2026-03-06T03:00:00.000Z	77 \| moderate	22.7 \| fine	39.972 \| good	16.158 \| good	0.591 \| good	15.03 \| good	0.553 \| good
2026-03-06T04:00:00.000Z	79 \| moderate	23.862 \| fine	65.082 \| fine	14.201 \| good	0.642 \| good	29.989 \| good	0.459 \| good
2026-03-06T05:00:00.000Z	71 \| moderate	19.805 \| fine	38.844 \| good	10.459 \| good	0.646 \| good	26.896 \| good	0.481 \| good
2026-03-06T06:00:00.000Z	69 \| moderate	19.199 \| fine	34.181 \| good	6.382 \| good	0.731 \| good	15.963 \| good	0.483 \| good
2026-03-06T07:00:00.000Z	75 \| moderate	21.761 \| fine	35.134 \| good	5.708 \| good	1.035 \| good	17.615 \| good	0.028 \| good
2026-03-06T08:00:00.000Z	67 \| moderate	18.16 \| fine	43.349 \| good	4.445 \| good	1.058 \| good	13.35 \| good	0.038 \| good
2026-03-06T09:00:00.000Z	77 \| moderate	22.647 \| fine	46.457 \| good	4.728 \| good	0.99 \| good	12.583 \| good	0.038 \| good
2026-03-06T10:00:00.000Z	71 \| moderate	19.63 \| fine	44.92 \| good	6.713 \| good	0.77 \| good	8.994 \| good	0.032 \| good
2026-03-06T11:00:00.000Z	73 \| moderate	20.975 \| fine	59.705 \| fine	7.925 \| good	0.695 \| good	10.057 \| good	0.026 \| good
2026-03-06T12:00:00.000Z	75 \| moderate	21.914 \| fine	34.45 \| good	7.707 \| good	0.633 \| good	9.704 \| good	0.021 \| good
2026-03-06T13:00:00.000Z	69 \| moderate	18.59 \| fine	44.885 \| good	8.097 \| good	0.673 \| good	19.113 \| good	0.016 \| good
2026-03-06T14:00:00.000Z	64 \| moderate	15.501 \| fine	52.457 \| good	11.876 \| good	0.689 \| good	19.333 \| good	0.014 \| good
2026-03-06T15:00:00.000Z	81 \| moderate	25.5 \| fine	41.332 \| good	11.986 \| good	0.585 \| good	18.948 \| good	0.013 \| good
2026-03-06T16:00:00.000Z	77 \| moderate	23.186 \| fine	56.271 \| fine	16.406 \| good	0.741 \| good	11.766 \| good	0.014 \| good
2026-03-06T17:00:00.000Z	67 \| moderate	17.541 \| fine	31.544 \| good	17.798 \| good	0.659 \| good	12.553 \| good	0.017 \| good
2026-03-06T18:00:00.000Z	64 \| moderate	16.066 \| fine	40.36 \| good	20.926 \| good	0.651 \| good	11.953 \| good	0.019 \| good
2026-03-06T19:00:00.000Z	73 \| moderate	20.769 \| fine	44.426 \| good	22.893 \| good	0.685 \| good	11.859 \| good	0.026 \| good
2026-03-06T20:00:00.000Z	69 \| moderate	19.199 \| fine	48.19 \| good	19.527 \| good	0.891 \| good	24.211 \| good	0.061 \| good
2026-03-06T21:00:00.000Z	75 \| moderate	21.656 \| fine	47.946 \| good	19.99 \| good	0.817 \| good	13.997 \| good	0.081 \| good
2026-03-06T22:00:00.000Z	60 \| moderate	14.205 \| fine	40.388 \| good	21.892 \| good	0.814 \| good	9.221 \| good	0.053 \| good
2026-03-06T23:00:00.000Z	82 \| moderate	25.737 \| fine	57.945 \| fine	18.693 \| good	0.678 \| good	8.735 \| good	0.066 \| good
2026-03-06T23:00:00.000Z	60 \| moderate	14.205 \| fine	40.388 \| good	21.892 \| good	0.814 \| good	9.221 \| good	0.053 \| good
2026-03-07T00:00:00.000Z	56 \| moderate	11.963 \| good	14.255 \| good	21.093 \| good	0.445 \| good	6.016 \| good	0.171 \| good
2026-03-07T01:00:00.000Z	52 \| moderate	9.664 \| good	12.527 \| good	25.237 \| good	0.326 \| good	3.545 \| good	0.159 \| good
2026-03-07T02:00:00.000Z	49 \| good	8.708 \| good	11.011 \| good	27.732 \| good	0.219 \| good	2.863 \| good	0.152 \| good
2026-03-07T03:00:00.000Z	38 \| good	7.201 \| good	10.076 \| good	27.848 \| good	0.18 \| good	2.41 \| good	0.15 \| good
2026-03-07T04:00:00.000Z	33 \| good	6.276 \| good	9.851 \| good	27.491 \| good	0.188 \| good	2.154 \| good	0.149 \| good
2026-03-07T05:00:00.000Z	33 \| good	6.254 \| good	9.565 \| good	27.235 \| good	0.185 \| good	2.051 \| good	0.148 \| good
2026-03-07T06:00:00.000Z	33 \| good	6.473 \| good	10.252 \| good	26.254 \| good	0.199 \| good	2.07 \| good	0.147 \| good
2026-03-07T07:00:00.000Z	38 \| good	6.541 \| good	10.57 \| good	26.193 \| good	0.296 \| good	2.488 \| good	0.149 \| good
2026-03-07T08:00:00.000Z	38 \| good	6.684 \| good	10.266 \| good	27.285 \| good	0.351 \| good	3.205 \| good	0.152 \| good
2026-03-07T09:00:00.000Z	38 \| good	6.64 \| good	10.384 \| good	27.799 \| good	0.364 \| good	3.292 \| good	0.151 \| good
2026-03-07T10:00:00.000Z	38 \| good	6.64 \| good	10.684 \| good	29.053 \| good	0.265 \| good	3.205 \| good	0.152 \| good
2026-03-07T11:00:00.000Z	33 \| good	6.12 \| good	11.248 \| good	29.489 \| good	0.235 \| good	3.369 \| good	0.152 \| good
2026-03-07T12:00:00.000Z	33 \| good	5.978 \| good	11.937 \| good	29.192 \| good	0.199 \| good	3.498 \| good	0.153 \| good
2026-03-07T13:00:00.000Z	33 \| good	6.192 \| good	12.497 \| good	29.051 \| good	0.185 \| good	3.568 \| good	0.153 \| good
2026-03-07T14:00:00.000Z	38 \| good	6.994 \| good	12.897 \| good	28.532 \| good	0.201 \| good	3.703 \| good	0.153 \| good
2026-03-07T15:00:00.000Z	44 \| good	7.629 \| good	13.159 \| good	27.417 \| good	0.185 \| good	3.907 \| good	0.154 \| good
2026-03-07T16:00:00.000Z	44 \| good	8.359 \| good	13.635 \| good	26.859 \| good	0.236 \| good	4.395 \| good	0.156 \| good
2026-03-07T17:00:00.000Z	44 \| good	8.456 \| good	15.002 \| good	25.025 \| good	0.28 \| good	4.787 \| good	0.162 \| good
2026-03-07T18:00:00.000Z	49 \| good	8.635 \| good	15.775 \| good	22.895 \| good	0.3 \| good	6.88 \| good	0.168 \| good
2026-03-07T19:00:00.000Z	52 \| moderate	9.818 \| good	16.278 \| good	21.666 \| good	0.363 \| good	7.215 \| good	0.174 \| good
2026-03-07T20:00:00.000Z	54 \| moderate	11.437 \| good	16.794 \| good	22.134 \| good	0.444 \| good	6.985 \| good	0.169 \| good
2026-03-07T21:00:00.000Z	56 \| moderate	11.893 \| good	17.369 \| good	23.216 \| good	0.51 \| good	6.856 \| good	0.166 \| good
2026-03-07T22:00:00.000Z	56 \| moderate	11.757 \| good	18.805 \| good	24.183 \| good	0.49 \| good	6.34 \| good	0.166 \| good
2026-03-07T23:00:00.000Z	56 \| moderate	11.949 \| good	19.87 \| good	24.692 \| good	0.464 \| good	5.731 \| good	0.166 \| good
2026-03-08T00:00:00.000Z	56 \| moderate	12.289 \| fine	19.974 \| good	23.915 \| good	0.441 \| good	5.017 \| good	0.165 \| good
2026-03-08T01:00:00.000Z	58 \| moderate	13.451 \| fine	19.916 \| good	23.463 \| good	0.293 \| good	4.8 \| good	0.166 \| good
2026-03-08T02:00:00.000Z	60 \| moderate	14.258 \| fine	20.805 \| good	22.932 \| good	0.197 \| good	4.467 \| good	0.165 \| good
2026-03-08T03:00:00.000Z	60 \| moderate	14.173 \| fine	20.367 \| good	22.674 \| good	0.133 \| good	3.282 \| good	0.163 \| good
2026-03-08T04:00:00.000Z	60 \| moderate	14.207 \| fine	20.586 \| good	24.29 \| good	0.112 \| good	2.904 \| good	0.16 \| good
2026-03-08T05:00:00.000Z	60 \| moderate	14.466 \| fine	23.091 \| good	24.561 \| good	0.097 \| good	2.411 \| good	0.156 \| good
2026-03-08T06:00:00.000Z	62 \| moderate	14.639 \| fine	23.641 \| good	23.191 \| good	0.16 \| good	2.398 \| good	0.16 \| good
2026-03-08T07:00:00.000Z	62 \| moderate	15.287 \| fine	25.559 \| good	22.219 \| good	0.243 \| good	3.241 \| good	0.161 \| good
2026-03-08T08:00:00.000Z	64 \| moderate	15.879 \| fine	30.263 \| good	23.977 \| good	0.316 \| good	3.769 \| good	0.164 \| good
2026-03-08T09:00:00.000Z	66 \| moderate	16.644 \| fine	34.637 \| good	23.578 \| good	0.336 \| good	3.847 \| good	0.17 \| good
2026-03-08T10:00:00.000Z	64 \| moderate	16.419 \| fine	34.191 \| good	23.927 \| good	0.317 \| good	3.829 \| good	0.179 \| good
2026-03-08T11:00:00.000Z	64 \| moderate	15.706 \| fine	31.335 \| good	23.311 \| good	0.334 \| good	4.218 \| good	0.186 \| good
2026-03-08T12:00:00.000Z	79 \| moderate	23.911 \| fine	32.935 \| good	23.581 \| good	0.332 \| good	4.915 \| good	0.192 \| good
2026-03-08T13:00:00.000Z	88 \| moderate	29.191 \| fine	36.503 \| good	24.882 \| good	0.46 \| good	5.096 \| good	0.196 \| good
2026-03-08T14:00:00.000Z	99 \| moderate	34.943 \| fine	41.513 \| good	28.067 \| good	0.536 \| good	5.198 \| good	0.203 \| good
2026-03-08T15:00:00.000Z	107 \| sensitive	38.019 \| moderate	47.064 \| good	30.139 \| good	0.541 \| good	5.276 \| good	0.214 \| good
2026-03-08T16:00:00.000Z	110 \| sensitive	39.39 \| moderate	52.365 \| good	30.81 \| good	0.498 \| good	6.186 \| good	0.216 \| good
2026-03-08T17:00:00.000Z	112 \| sensitive	39.697 \| moderate	53.195 \| good	25.809 \| good	0.546 \| good	8.778 \| good	0.224 \| good
2026-03-08T18:00:00.000Z	117 \| sensitive	41.795 \| moderate	53.831 \| good	21.299 \| good	0.758 \| good	11.948 \| good	0.238 \| good
2026-03-08T19:00:00.000Z	122 \| sensitive	43.902 \| moderate	56.938 \| fine	15.714 \| good	0.894 \| good	13.087 \| good	0.251 \| good
2026-03-08T20:00:00.000Z	127 \| sensitive	46.106 \| moderate	61.037 \| fine	12.363 \| good	0.781 \| good	14.336 \| good	0.26 \| good
2026-03-08T21:00:00.000Z	137 \| sensitive	50.479 \| moderate	63.808 \| fine	10.191 \| good	0.746 \| good	15.865 \| good	0.276 \| good
2026-03-08T22:00:00.000Z	153 \| unhealthy	57.664 \| poor	67.01 \| fine	11.329 \| good	0.642 \| good	16.205 \| good	0.289 \| good
2026-03-08T23:00:00.000Z	154 \| unhealthy	60.481 \| poor	68.738 \| fine	12.556 \| good	0.565 \| good	15.228 \| good	0.292 \| 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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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?