What is the current concentration of PM10 in Hertfordshire, UK?

The current PM10 concentration at Hertfordshire, UK is 12.594 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 1.165 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 20.349 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 5.22 ppb.

Live air quality index in Hertfordshire, UK today

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

Stay updated with real-time air quality in Hertfordshire, UK 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

Hertfordshire, UK

Last updated: ... (Local time)

Major air pollutants in Hertfordshire, UK

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

3.79 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

12.59 μg/m³

155

255

425

605+

Ozone (O₃)

20.35 ppb

201

201+

Sulfur Dioxide (SO₂)

1.17 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

5.22 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.01 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

Hertfordshire, UK

Get Live Pollen Counts

Hertfordshire, UK

Scroll To Air Quality Map

Track live Hertfordshire, UK air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-04T22:00:00.000Z	30 \| good	4.258 \| good	11.948 \| good	31.866 \| good	1.118 \| good	3.86 \| good	0.012 \| good
2025-06-04T23:00:00.000Z	30 \| good	4.622 \| good	16.172 \| good	31.54 \| good	1.061 \| good	8.766 \| good	0.014 \| good
2025-06-05T00:00:00.000Z	29 \| good	4.534 \| good	15.301 \| good	31.336 \| good	1.062 \| good	5.128 \| good	0.328 \| good
2025-06-05T01:00:00.000Z	27 \| good	4.935 \| good	17.617 \| good	29.319 \| good	1.052 \| good	6.311 \| good	0.301 \| good
2025-06-05T02:00:00.000Z	30 \| good	3.879 \| good	18.772 \| good	31.56 \| good	0.91 \| good	6.486 \| good	0.011 \| good
2025-06-05T03:00:00.000Z	27 \| good	4.339 \| good	15.129 \| good	29.292 \| good	1.1 \| good	7.426 \| good	0.011 \| good
2025-06-05T04:00:00.000Z	33 \| good	6.49 \| good	13.327 \| good	29.054 \| good	1.25 \| good	4.027 \| good	0.011 \| good
2025-06-05T05:00:00.000Z	29 \| good	4.226 \| good	12.816 \| good	31.457 \| good	1.15 \| good	4.119 \| good	0.011 \| good
2025-06-05T06:00:00.000Z	27 \| good	3.61 \| good	12.952 \| good	28.52 \| good	1.193 \| good	3.332 \| good	0.018 \| good
2025-06-05T07:00:00.000Z	32 \| good	3.87 \| good	11.147 \| good	35.457 \| good	1.197 \| good	4.611 \| good	0.011 \| good
2025-06-05T08:00:00.000Z	30 \| good	4.2 \| good	12.8 \| good	31.724 \| good	1.216 \| good	5.679 \| good	0.011 \| good
2025-06-05T09:00:00.000Z	31 \| good	4.309 \| good	16.731 \| good	34.114 \| good	1.209 \| good	3.952 \| good	0.01 \| good
2025-06-05T10:00:00.000Z	30 \| good	5.209 \| good	11.827 \| good	32.469 \| good	1.587 \| good	4.241 \| good	0.01 \| good
2025-06-05T11:00:00.000Z	33 \| good	5.721 \| good	10.562 \| good	30.319 \| good	1.397 \| good	4.156 \| good	0.009 \| good
2025-06-05T12:00:00.000Z	31 \| good	3.229 \| good	9.12 \| good	33.922 \| good	1.271 \| good	5.172 \| good	0.01 \| good
2025-06-05T13:00:00.000Z	34 \| good	6.418 \| good	7.746 \| good	36.678 \| good	1.27 \| good	3.997 \| good	0.01 \| good
2025-06-05T14:00:00.000Z	33 \| good	3.504 \| good	8.098 \| good	35.62 \| good	1.271 \| good	3.485 \| good	0.009 \| good
2025-06-05T15:00:00.000Z	33 \| good	3.43 \| good	10.583 \| good	35.956 \| good	1.271 \| good	4.604 \| good	0.009 \| good
2025-06-05T16:00:00.000Z	31 \| good	3.709 \| good	9.55 \| good	34.316 \| good	1.27 \| good	5.394 \| good	0.01 \| good
2025-06-05T17:00:00.000Z	32 \| good	3.684 \| good	10.876 \| good	35.129 \| good	1.385 \| good	5.376 \| good	0.01 \| good
2025-06-05T18:00:00.000Z	26 \| good	3.378 \| good	13.411 \| good	27.631 \| good	1.384 \| good	5.328 \| good	0.01 \| good
2025-06-05T19:00:00.000Z	31 \| good	3.443 \| good	11.996 \| good	33.592 \| good	1.387 \| good	7.314 \| good	0.012 \| good
2025-06-05T20:00:00.000Z	34 \| good	3.468 \| good	8.486 \| good	37.244 \| good	1.241 \| good	7.129 \| good	0.016 \| good
2025-06-05T21:00:00.000Z	32 \| good	3.685 \| good	11.146 \| good	35.28 \| good	1.292 \| good	5.251 \| good	0.018 \| good
2025-06-05T22:00:00.000Z	33 \| good	3.721 \| good	15.035 \| good	36.104 \| good	1.377 \| good	4.912 \| good	0.017 \| good
2025-06-05T23:00:00.000Z	30 \| good	3.056 \| good	13.7 \| good	31.544 \| good	1.476 \| good	4.626 \| good	0.02 \| good
2025-06-06T00:00:00.000Z	24 \| good	2.86 \| good	11.738 \| good	26.113 \| good	1.251 \| good	4.198 \| good	0.325 \| good
2025-06-06T01:00:00.000Z	20 \| good	3.23 \| good	11.945 \| good	22.482 \| good	1.197 \| good	3.062 \| good	0.319 \| good
2025-06-06T02:00:00.000Z	22 \| good	3.958 \| good	11.753 \| good	21.874 \| good	1.202 \| good	2.35 \| good	0.302 \| good
2025-06-06T03:00:00.000Z	22 \| good	3.721 \| good	12.551 \| good	23.436 \| good	1.136 \| good	2.296 \| good	0.288 \| good
2025-06-06T04:00:00.000Z	22 \| good	3.108 \| good	10.653 \| good	24.286 \| good	1.087 \| good	1.797 \| good	0.333 \| good
2025-06-06T05:00:00.000Z	19 \| good	3.086 \| good	11.111 \| good	20.052 \| good	1.169 \| good	2.107 \| good	0.011 \| good
2025-06-06T06:00:00.000Z	19 \| good	3.243 \| good	11.762 \| good	19.898 \| good	1.22 \| good	3.234 \| good	0.012 \| good
2025-06-06T07:00:00.000Z	21 \| good	3.239 \| good	11.34 \| good	22.511 \| good	1.139 \| good	6.653 \| good	0.016 \| good
2025-06-06T08:00:00.000Z	22 \| good	3.609 \| good	8.592 \| good	19.592 \| good	1.244 \| good	5.253 \| good	0.011 \| good
2025-06-06T09:00:00.000Z	18 \| good	3.331 \| good	6.79 \| good	19.172 \| good	1.249 \| good	4.959 \| good	0.01 \| good
2025-06-06T10:00:00.000Z	19 \| good	3.403 \| good	12.142 \| good	21.206 \| good	1.368 \| good	4.054 \| good	0.01 \| good
2025-06-06T11:00:00.000Z	19 \| good	3.241 \| good	11.075 \| good	20.871 \| good	1.319 \| good	4.798 \| good	0.01 \| good
2025-06-06T12:00:00.000Z	23 \| good	3.229 \| good	11.033 \| good	25.023 \| good	1.176 \| good	5.168 \| good	0.009 \| good
2025-06-06T13:00:00.000Z	19 \| good	3.375 \| good	7.9 \| good	21.184 \| good	1.081 \| good	6.286 \| good	0.009 \| good
2025-06-06T14:00:00.000Z	22 \| good	3.205 \| good	12.064 \| good	24.303 \| good	1.081 \| good	5.259 \| good	0.01 \| good
2025-06-06T15:00:00.000Z	25 \| good	3.104 \| good	8.615 \| good	27.285 \| good	1.084 \| good	6.141 \| good	0.01 \| good
2025-06-06T16:00:00.000Z	22 \| good	4.047 \| good	12.853 \| good	22.769 \| good	0.949 \| good	6.858 \| good	0.01 \| good
2025-06-06T17:00:00.000Z	31 \| good	4.863 \| good	11.546 \| good	33.487 \| good	0.948 \| good	8.645 \| good	0.01 \| good
2025-06-06T18:00:00.000Z	31 \| good	3.654 \| good	9.309 \| good	33.9 \| good	1.026 \| good	7.814 \| good	0.012 \| good
2025-06-06T19:00:00.000Z	24 \| good	3.379 \| good	17.721 \| good	26.051 \| good	0.906 \| good	7.913 \| good	0.014 \| good
2025-06-06T20:00:00.000Z	25 \| good	3.368 \| good	11.825 \| good	27.143 \| good	0.866 \| good	5.66 \| good	0.016 \| good
2025-06-06T21:00:00.000Z	27 \| good	3.248 \| good	7.921 \| good	29.269 \| good	0.939 \| good	7.258 \| good	0.014 \| good
2025-06-06T07:00:00.000Z	22 \| good	3.788 \| good	12.594 \| good	20.349 \| good	1.165 \| good	5.22 \| good	0.015 \| good
2025-06-06T08:00:00.000Z	33 \| good	6.156 \| good	8.548 \| good	29.511 \| good	0.151 \| good	3.757 \| good	0.13 \| good
2025-06-06T09:00:00.000Z	29 \| good	5.251 \| good	7.39 \| good	31.171 \| good	0.137 \| good	3.469 \| good	0.129 \| good
2025-06-06T10:00:00.000Z	29 \| good	4.456 \| good	5.832 \| good	30.534 \| good	0.121 \| good	2.817 \| good	0.127 \| good
2025-06-06T11:00:00.000Z	29 \| good	4.185 \| good	5.176 \| good	31.496 \| good	0.118 \| good	2.347 \| good	0.125 \| good
2025-06-06T12:00:00.000Z	33 \| good	3.697 \| good	4.415 \| good	36.311 \| good	0.113 \| good	1.901 \| good	0.122 \| good
2025-06-06T13:00:00.000Z	37 \| good	3.709 \| good	4.573 \| good	40.132 \| good	0.096 \| good	1.298 \| good	0.114 \| good
2025-06-06T14:00:00.000Z	38 \| good	4.315 \| good	5.204 \| good	41.389 \| good	0.085 \| good	1.249 \| good	0.109 \| good
2025-06-06T15:00:00.000Z	39 \| good	4.744 \| good	5.886 \| good	42.094 \| good	0.1 \| good	1.648 \| good	0.109 \| good
2025-06-06T16:00:00.000Z	41 \| good	4.746 \| good	6.815 \| good	43.516 \| good	0.122 \| good	2.052 \| good	0.111 \| good
2025-06-06T17:00:00.000Z	42 \| good	4.769 \| good	7.009 \| good	45.373 \| good	0.165 \| good	2.646 \| good	0.114 \| good
2025-06-06T18:00:00.000Z	42 \| good	4.426 \| good	6.928 \| good	44.647 \| good	0.179 \| good	3.1 \| good	0.111 \| good
2025-06-06T19:00:00.000Z	41 \| good	4.498 \| good	6.773 \| good	43.895 \| good	0.165 \| good	3.029 \| good	0.109 \| good
2025-06-06T20:00:00.000Z	38 \| good	4.884 \| good	7.303 \| good	40.533 \| good	0.192 \| good	3.336 \| good	0.109 \| good
2025-06-06T21:00:00.000Z	35 \| good	5.142 \| good	8.283 \| good	37.517 \| good	0.257 \| good	3.96 \| good	0.11 \| good
2025-06-06T22:00:00.000Z	33 \| good	5.725 \| good	8.709 \| good	34.469 \| good	0.267 \| good	5.34 \| good	0.112 \| good
2025-06-06T23:00:00.000Z	33 \| good	6.345 \| good	8.497 \| good	30.981 \| good	0.267 \| good	6.672 \| good	0.114 \| good
2025-06-07T00:00:00.000Z	33 \| good	6.269 \| good	8.063 \| good	29.499 \| good	0.229 \| good	6.396 \| good	0.115 \| good
2025-06-07T01:00:00.000Z	28 \| good	5.475 \| good	6.566 \| good	29.572 \| good	0.187 \| good	4.814 \| good	0.112 \| good
2025-06-07T02:00:00.000Z	28 \| good	4.963 \| good	6.059 \| good	30.499 \| good	0.117 \| good	3.994 \| good	0.111 \| good
2025-06-07T03:00:00.000Z	29 \| good	5.027 \| good	5.507 \| good	30.882 \| good	0.089 \| good	3.016 \| good	0.109 \| good
2025-06-07T04:00:00.000Z	28 \| good	4.601 \| good	5.008 \| good	30.388 \| good	0.066 \| good	1.699 \| good	0.107 \| good
2025-06-07T05:00:00.000Z	28 \| good	4.858 \| good	5.563 \| good	29.627 \| good	0.07 \| good	1.378 \| good	0.107 \| good
2025-06-07T06:00:00.000Z	28 \| good	5.114 \| good	7.058 \| good	30.175 \| good	0.086 \| good	1.286 \| good	0.108 \| good
2025-06-07T07:00:00.000Z	29 \| good	5.055 \| good	7.641 \| good	30.805 \| good	0.109 \| good	1.333 \| good	0.112 \| good
2025-06-07T08:00:00.000Z	29 \| good	4.435 \| good	7.029 \| good	31.397 \| good	0.13 \| good	1.539 \| good	0.117 \| good
2025-06-07T09:00:00.000Z	30 \| good	3.689 \| good	5.527 \| good	31.683 \| good	0.142 \| good	1.755 \| good	0.121 \| good
2025-06-07T10:00:00.000Z	31 \| good	2.982 \| good	3.934 \| good	33.378 \| good	0.131 \| good	1.983 \| good	0.123 \| good
2025-06-07T11:00:00.000Z	32 \| good	2.739 \| good	3.752 \| good	34.803 \| good	0.109 \| good	1.845 \| good	0.125 \| good
2025-06-07T12:00:00.000Z	34 \| good	3.011 \| good	3.852 \| good	36.573 \| good	0.082 \| good	1.708 \| good	0.125 \| good
2025-06-07T13:00:00.000Z	35 \| good	3.19 \| good	4.116 \| good	37.74 \| good	0.071 \| good	1.513 \| good	0.124 \| good
2025-06-07T14:00:00.000Z	36 \| good	3.637 \| good	4.69 \| good	38.687 \| good	0.068 \| good	1.402 \| good	0.123 \| good
2025-06-07T15:00:00.000Z	36 \| good	4.238 \| good	5.197 \| good	38.784 \| good	0.065 \| good	1.353 \| good	0.121 \| good
2025-06-07T16:00:00.000Z	32 \| good	3.365 \| good	4.229 \| good	35.176 \| good	0.066 \| good	1.386 \| good	0.118 \| good
2025-06-07T17:00:00.000Z	33 \| good	2.977 \| good	3.989 \| good	35.766 \| good	0.071 \| good	1.605 \| good	0.117 \| good
2025-06-07T18:00:00.000Z	34 \| good	2.925 \| good	4.715 \| good	36.681 \| good	0.087 \| good	1.774 \| good	0.119 \| good
2025-06-07T19:00:00.000Z	32 \| good	2.761 \| good	4.289 \| good	34.893 \| good	0.102 \| good	2.063 \| good	0.118 \| good
2025-06-07T20:00:00.000Z	30 \| good	2.689 \| good	3.754 \| good	32.443 \| good	0.102 \| good	2.163 \| good	0.117 \| good
2025-06-07T21:00:00.000Z	29 \| good	2.586 \| good	3.466 \| good	30.981 \| good	0.115 \| good	2.42 \| good	0.119 \| good
2025-06-07T22:00:00.000Z	28 \| good	2.475 \| good	3.053 \| good	30.496 \| good	0.106 \| good	2.506 \| good	0.122 \| good
2025-06-07T23:00:00.000Z	30 \| good	2.636 \| good	3.549 \| good	31.834 \| good	0.097 \| good	2.526 \| good	0.114 \| good
2025-06-08T00:00:00.000Z	31 \| good	3.144 \| good	4.706 \| good	33.138 \| good	0.104 \| good	2.129 \| good	0.108 \| good
2025-06-08T01:00:00.000Z	25 \| good	2.358 \| good	2.527 \| good	26.568 \| good	0.539 \| good	2.775 \| good	0.11 \| good
2025-06-08T02:00:00.000Z	25 \| good	2.057 \| good	2.298 \| good	26.515 \| good	0.569 \| good	2.909 \| good	0.11 \| good
2025-06-08T03:00:00.000Z	24 \| good	1.924 \| good	2.251 \| good	26.463 \| good	0.6 \| good	3.043 \| good	0.111 \| good
2025-06-08T04:00:00.000Z	24 \| good	1.862 \| good	2.297 \| good	25.741 \| good	0.489 \| good	1.722 \| good	0.103 \| good
2025-06-08T05:00:00.000Z	24 \| good	1.919 \| good	2.434 \| good	25.654 \| good	0.523 \| good	1.808 \| good	0.103 \| good
2025-06-08T06:00:00.000Z	24 \| good	1.959 \| good	2.489 \| good	25.567 \| good	0.558 \| good	1.894 \| good	0.104 \| good
2025-06-08T07:00:00.000Z	33 \| good	2.628 \| good	3.473 \| good	36.259 \| good	0.416 \| good	1.282 \| good	0.095 \| good

Hertfordshire

Get reliable air quality data to drive your business

Hertfordshire, UK air quality map: Track AQI near you

Air quality in cities of Hertfordshire, UK

City	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
Bishop's Stortford, Hertfordshire	34 Good	2.94μg/m³ Good	23.26μg/m³ Good	37.01ppb Good	0.92ppb Good	5.66ppb Good	0.02ppm Good
Sawbridgeworth, Hertfordshire	34 Good	2.94μg/m³ Good	23.26μg/m³ Good	37.01ppb Good	0.92ppb Good	5.66ppb Good	0.02ppm Good
Waltham Cross, Hertfordshire	33 Good	6.12μg/m³ Good	11.51μg/m³ Good	34.46ppb Good	0.90ppb Good	4.00ppb Good	0.01ppm Good
Cheshunt, Hertfordshire	33 Good	5.91μg/m³ Good	11.56μg/m³ Good	33.86ppb Good	0.91ppb Good	4.59ppb Good	0.01ppm Good
Borehamwood, Hertfordshire	32 Good	2.54μg/m³ Good	6.32μg/m³ Good	34.72ppb Good	0.75ppb Good	2.56ppb Good	0.01ppm Good
Hatfield, Hertfordshire	32 Good	3.20μg/m³ Good	12.63μg/m³ Good	35.10ppb Good	0.85ppb Good	5.52ppb Good	0.01ppm Good
Bushey, Hertfordshire	31 Good	3.66μg/m³ Good	13.28μg/m³ Good	33.40ppb Good	0.54ppb Good	7.07ppb Good	0.01ppm Good
Potters Bar, Hertfordshire	31 Good	3.75μg/m³ Good	7.80μg/m³ Good	33.67ppb Good	0.90ppb Good	3.46ppb Good	0.01ppm Good
Hoddesdon, Hertfordshire	33 Good	5.69μg/m³ Good	11.61μg/m³ Good	33.24ppb Good	0.91ppb Good	5.18ppb Good	0.01ppm Good
Hertford, Hertfordshire	31 Good	4.48μg/m³ Good	11.76μg/m³ Good	32.69ppb Good	0.89ppb Good	5.78ppb Good	0.01ppm Good
Berkhamsted, Hertfordshire	30 Good	3.16μg/m³ Good	11.00μg/m³ Good	32.28ppb Good	0.86ppb Good	4.82ppb Good	0.02ppm Good
Hemel Hempstead, Hertfordshire	31 Good	3.02μg/m³ Good	11.14μg/m³ Good	32.66ppb Good	0.85ppb Good	8.12ppb Good	0.02ppm Good
Abbots Langley, Hertfordshire	31 Good	3.02μg/m³ Good	11.14μg/m³ Good	32.66ppb Good	0.85ppb Good	8.12ppb Good	0.02ppm Good
St Albans, Hertfordshire	31 Good	3.25μg/m³ Good	10.95μg/m³ Good	32.91ppb Good	0.67ppb Good	5.70ppb Good	0.01ppm Good
Watford, Hertfordshire	30 Good	3.14μg/m³ Good	9.32μg/m³ Good	32.41ppb Good	0.83ppb Good	4.04ppb Good	0.01ppm Good
Harpenden, Hertfordshire	25 Good	3.41μg/m³ Good	12.42μg/m³ Good	27.14ppb Good	0.86ppb Good	3.12ppb Good	0.02ppm Good
Baldock, Hertfordshire	25 Good	3.33μg/m³ Good	11.83μg/m³ Good	27.14ppb Good	0.88ppb Good	5.86ppb Good	0.02ppm Good
Chorleywood, Hertfordshire	25 Good	2.91μg/m³ Good	10.42μg/m³ Good	26.80ppb Good	0.84ppb Good	6.77ppb Good	0.02ppm Good
Rickmansworth, Hertfordshire	25 Good	2.91μg/m³ Good	10.42μg/m³ Good	26.80ppb Good	0.84ppb Good	6.77ppb Good	0.02ppm Good
Stevenage, Hertfordshire	25 Good	3.33μg/m³ Good	11.83μg/m³ Good	27.14ppb Good	0.88ppb Good	5.86ppb Good	0.02ppm Good
Letchworth, Hertfordshire	25 Good	3.33μg/m³ Good	11.83μg/m³ Good	27.14ppb Good	0.88ppb Good	5.86ppb Good	0.02ppm Good
Royston, Hertfordshire	25 Good	3.39μg/m³ Good	22.50μg/m³ Good	27.14ppb Good	0.90ppb Good	5.75ppb Good	0.03ppm Good
Hitchin, Hertfordshire	25 Good	3.33μg/m³ Good	11.83μg/m³ Good	27.14ppb Good	0.88ppb Good	5.86ppb Good	0.02ppm Good
Welwyn Garden City, Hertfordshire	25 Good	3.37μg/m³ Good	11.82μg/m³ Good	27.14ppb Good	0.87ppb Good	5.66ppb Good	0.02ppm Good
Tring, Hertfordshire	25 Good	3.53μg/m³ Good	13.03μg/m³ Good	27.14ppb Good	0.77ppb Good	3.81ppb Good	0.03ppm Good
Ware, Hertfordshire	25 Good	3.38μg/m³ Good	11.46μg/m³ Good	27.14ppb Good	0.89ppb Good	5.68ppb Good	0.02ppm Good

City	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
No results found

0.03ppm

How accurate is Hertfordshire, UK air quality data?

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

Source: Ambee Data Sources

Air quality levels in UK

Check live rankings of places in the UK affected by air pollution.

View Polluted Cities

Check live rankings of places in the UK with the cleanest air.

View Clean Cities

Frequently asked questions

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

The air quality for Hertfordshire, UK is updated every hour.

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

The worst air quality in Hertfordshire, UK in the last 24 hours was observed at 08:00:00 on 2025-06-05.

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

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

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 22, categorized as Good based on real-time data.

What pollutant is the most common in Hertfordshire, UK?

The most common pollutant in Hertfordshire, UK is PM2.5.

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

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

What is the current concentration of PM_2.5 in Hertfordshire, UK?

The current PM_2.5 concentration at Hertfordshire, UK is 3.788 μg/m³.

What is the current concentration of PM₁₀ in Hertfordshire, UK?

The current PM₁₀ concentration at Hertfordshire, UK is 12.594 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.015 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 1.165 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 20.349 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 5.22 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-04T22:00:00.000Z	30 \| good	4.258 \| good	11.948 \| good	31.866 \| good	1.118 \| good	3.86 \| good	0.012 \| good
2025-06-04T23:00:00.000Z	30 \| good	4.622 \| good	16.172 \| good	31.54 \| good	1.061 \| good	8.766 \| good	0.014 \| good
2025-06-05T00:00:00.000Z	29 \| good	4.534 \| good	15.301 \| good	31.336 \| good	1.062 \| good	5.128 \| good	0.328 \| good
2025-06-05T01:00:00.000Z	27 \| good	4.935 \| good	17.617 \| good	29.319 \| good	1.052 \| good	6.311 \| good	0.301 \| good
2025-06-05T02:00:00.000Z	30 \| good	3.879 \| good	18.772 \| good	31.56 \| good	0.91 \| good	6.486 \| good	0.011 \| good
2025-06-05T03:00:00.000Z	27 \| good	4.339 \| good	15.129 \| good	29.292 \| good	1.1 \| good	7.426 \| good	0.011 \| good
2025-06-05T04:00:00.000Z	33 \| good	6.49 \| good	13.327 \| good	29.054 \| good	1.25 \| good	4.027 \| good	0.011 \| good
2025-06-05T05:00:00.000Z	29 \| good	4.226 \| good	12.816 \| good	31.457 \| good	1.15 \| good	4.119 \| good	0.011 \| good
2025-06-05T06:00:00.000Z	27 \| good	3.61 \| good	12.952 \| good	28.52 \| good	1.193 \| good	3.332 \| good	0.018 \| good
2025-06-05T07:00:00.000Z	32 \| good	3.87 \| good	11.147 \| good	35.457 \| good	1.197 \| good	4.611 \| good	0.011 \| good
2025-06-05T08:00:00.000Z	30 \| good	4.2 \| good	12.8 \| good	31.724 \| good	1.216 \| good	5.679 \| good	0.011 \| good
2025-06-05T09:00:00.000Z	31 \| good	4.309 \| good	16.731 \| good	34.114 \| good	1.209 \| good	3.952 \| good	0.01 \| good
2025-06-05T10:00:00.000Z	30 \| good	5.209 \| good	11.827 \| good	32.469 \| good	1.587 \| good	4.241 \| good	0.01 \| good
2025-06-05T11:00:00.000Z	33 \| good	5.721 \| good	10.562 \| good	30.319 \| good	1.397 \| good	4.156 \| good	0.009 \| good
2025-06-05T12:00:00.000Z	31 \| good	3.229 \| good	9.12 \| good	33.922 \| good	1.271 \| good	5.172 \| good	0.01 \| good
2025-06-05T13:00:00.000Z	34 \| good	6.418 \| good	7.746 \| good	36.678 \| good	1.27 \| good	3.997 \| good	0.01 \| good
2025-06-05T14:00:00.000Z	33 \| good	3.504 \| good	8.098 \| good	35.62 \| good	1.271 \| good	3.485 \| good	0.009 \| good
2025-06-05T15:00:00.000Z	33 \| good	3.43 \| good	10.583 \| good	35.956 \| good	1.271 \| good	4.604 \| good	0.009 \| good
2025-06-05T16:00:00.000Z	31 \| good	3.709 \| good	9.55 \| good	34.316 \| good	1.27 \| good	5.394 \| good	0.01 \| good
2025-06-05T17:00:00.000Z	32 \| good	3.684 \| good	10.876 \| good	35.129 \| good	1.385 \| good	5.376 \| good	0.01 \| good
2025-06-05T18:00:00.000Z	26 \| good	3.378 \| good	13.411 \| good	27.631 \| good	1.384 \| good	5.328 \| good	0.01 \| good
2025-06-05T19:00:00.000Z	31 \| good	3.443 \| good	11.996 \| good	33.592 \| good	1.387 \| good	7.314 \| good	0.012 \| good
2025-06-05T20:00:00.000Z	34 \| good	3.468 \| good	8.486 \| good	37.244 \| good	1.241 \| good	7.129 \| good	0.016 \| good
2025-06-05T21:00:00.000Z	32 \| good	3.685 \| good	11.146 \| good	35.28 \| good	1.292 \| good	5.251 \| good	0.018 \| good
2025-06-05T22:00:00.000Z	33 \| good	3.721 \| good	15.035 \| good	36.104 \| good	1.377 \| good	4.912 \| good	0.017 \| good
2025-06-05T23:00:00.000Z	30 \| good	3.056 \| good	13.7 \| good	31.544 \| good	1.476 \| good	4.626 \| good	0.02 \| good
2025-06-06T00:00:00.000Z	24 \| good	2.86 \| good	11.738 \| good	26.113 \| good	1.251 \| good	4.198 \| good	0.325 \| good
2025-06-06T01:00:00.000Z	20 \| good	3.23 \| good	11.945 \| good	22.482 \| good	1.197 \| good	3.062 \| good	0.319 \| good
2025-06-06T02:00:00.000Z	22 \| good	3.958 \| good	11.753 \| good	21.874 \| good	1.202 \| good	2.35 \| good	0.302 \| good
2025-06-06T03:00:00.000Z	22 \| good	3.721 \| good	12.551 \| good	23.436 \| good	1.136 \| good	2.296 \| good	0.288 \| good
2025-06-06T04:00:00.000Z	22 \| good	3.108 \| good	10.653 \| good	24.286 \| good	1.087 \| good	1.797 \| good	0.333 \| good
2025-06-06T05:00:00.000Z	19 \| good	3.086 \| good	11.111 \| good	20.052 \| good	1.169 \| good	2.107 \| good	0.011 \| good
2025-06-06T06:00:00.000Z	19 \| good	3.243 \| good	11.762 \| good	19.898 \| good	1.22 \| good	3.234 \| good	0.012 \| good
2025-06-06T07:00:00.000Z	21 \| good	3.239 \| good	11.34 \| good	22.511 \| good	1.139 \| good	6.653 \| good	0.016 \| good
2025-06-06T08:00:00.000Z	22 \| good	3.609 \| good	8.592 \| good	19.592 \| good	1.244 \| good	5.253 \| good	0.011 \| good
2025-06-06T09:00:00.000Z	18 \| good	3.331 \| good	6.79 \| good	19.172 \| good	1.249 \| good	4.959 \| good	0.01 \| good
2025-06-06T10:00:00.000Z	19 \| good	3.403 \| good	12.142 \| good	21.206 \| good	1.368 \| good	4.054 \| good	0.01 \| good
2025-06-06T11:00:00.000Z	19 \| good	3.241 \| good	11.075 \| good	20.871 \| good	1.319 \| good	4.798 \| good	0.01 \| good
2025-06-06T12:00:00.000Z	23 \| good	3.229 \| good	11.033 \| good	25.023 \| good	1.176 \| good	5.168 \| good	0.009 \| good
2025-06-06T13:00:00.000Z	19 \| good	3.375 \| good	7.9 \| good	21.184 \| good	1.081 \| good	6.286 \| good	0.009 \| good
2025-06-06T14:00:00.000Z	22 \| good	3.205 \| good	12.064 \| good	24.303 \| good	1.081 \| good	5.259 \| good	0.01 \| good
2025-06-06T15:00:00.000Z	25 \| good	3.104 \| good	8.615 \| good	27.285 \| good	1.084 \| good	6.141 \| good	0.01 \| good
2025-06-06T16:00:00.000Z	22 \| good	4.047 \| good	12.853 \| good	22.769 \| good	0.949 \| good	6.858 \| good	0.01 \| good
2025-06-06T17:00:00.000Z	31 \| good	4.863 \| good	11.546 \| good	33.487 \| good	0.948 \| good	8.645 \| good	0.01 \| good
2025-06-06T18:00:00.000Z	31 \| good	3.654 \| good	9.309 \| good	33.9 \| good	1.026 \| good	7.814 \| good	0.012 \| good
2025-06-06T19:00:00.000Z	24 \| good	3.379 \| good	17.721 \| good	26.051 \| good	0.906 \| good	7.913 \| good	0.014 \| good
2025-06-06T20:00:00.000Z	25 \| good	3.368 \| good	11.825 \| good	27.143 \| good	0.866 \| good	5.66 \| good	0.016 \| good
2025-06-06T21:00:00.000Z	27 \| good	3.248 \| good	7.921 \| good	29.269 \| good	0.939 \| good	7.258 \| good	0.014 \| good
2025-06-06T07:00:00.000Z	22 \| good	3.788 \| good	12.594 \| good	20.349 \| good	1.165 \| good	5.22 \| good	0.015 \| good
2025-06-06T08:00:00.000Z	33 \| good	6.156 \| good	8.548 \| good	29.511 \| good	0.151 \| good	3.757 \| good	0.13 \| good
2025-06-06T09:00:00.000Z	29 \| good	5.251 \| good	7.39 \| good	31.171 \| good	0.137 \| good	3.469 \| good	0.129 \| good
2025-06-06T10:00:00.000Z	29 \| good	4.456 \| good	5.832 \| good	30.534 \| good	0.121 \| good	2.817 \| good	0.127 \| good
2025-06-06T11:00:00.000Z	29 \| good	4.185 \| good	5.176 \| good	31.496 \| good	0.118 \| good	2.347 \| good	0.125 \| good
2025-06-06T12:00:00.000Z	33 \| good	3.697 \| good	4.415 \| good	36.311 \| good	0.113 \| good	1.901 \| good	0.122 \| good
2025-06-06T13:00:00.000Z	37 \| good	3.709 \| good	4.573 \| good	40.132 \| good	0.096 \| good	1.298 \| good	0.114 \| good
2025-06-06T14:00:00.000Z	38 \| good	4.315 \| good	5.204 \| good	41.389 \| good	0.085 \| good	1.249 \| good	0.109 \| good
2025-06-06T15:00:00.000Z	39 \| good	4.744 \| good	5.886 \| good	42.094 \| good	0.1 \| good	1.648 \| good	0.109 \| good
2025-06-06T16:00:00.000Z	41 \| good	4.746 \| good	6.815 \| good	43.516 \| good	0.122 \| good	2.052 \| good	0.111 \| good
2025-06-06T17:00:00.000Z	42 \| good	4.769 \| good	7.009 \| good	45.373 \| good	0.165 \| good	2.646 \| good	0.114 \| good
2025-06-06T18:00:00.000Z	42 \| good	4.426 \| good	6.928 \| good	44.647 \| good	0.179 \| good	3.1 \| good	0.111 \| good
2025-06-06T19:00:00.000Z	41 \| good	4.498 \| good	6.773 \| good	43.895 \| good	0.165 \| good	3.029 \| good	0.109 \| good
2025-06-06T20:00:00.000Z	38 \| good	4.884 \| good	7.303 \| good	40.533 \| good	0.192 \| good	3.336 \| good	0.109 \| good
2025-06-06T21:00:00.000Z	35 \| good	5.142 \| good	8.283 \| good	37.517 \| good	0.257 \| good	3.96 \| good	0.11 \| good
2025-06-06T22:00:00.000Z	33 \| good	5.725 \| good	8.709 \| good	34.469 \| good	0.267 \| good	5.34 \| good	0.112 \| good
2025-06-06T23:00:00.000Z	33 \| good	6.345 \| good	8.497 \| good	30.981 \| good	0.267 \| good	6.672 \| good	0.114 \| good
2025-06-07T00:00:00.000Z	33 \| good	6.269 \| good	8.063 \| good	29.499 \| good	0.229 \| good	6.396 \| good	0.115 \| good
2025-06-07T01:00:00.000Z	28 \| good	5.475 \| good	6.566 \| good	29.572 \| good	0.187 \| good	4.814 \| good	0.112 \| good
2025-06-07T02:00:00.000Z	28 \| good	4.963 \| good	6.059 \| good	30.499 \| good	0.117 \| good	3.994 \| good	0.111 \| good
2025-06-07T03:00:00.000Z	29 \| good	5.027 \| good	5.507 \| good	30.882 \| good	0.089 \| good	3.016 \| good	0.109 \| good
2025-06-07T04:00:00.000Z	28 \| good	4.601 \| good	5.008 \| good	30.388 \| good	0.066 \| good	1.699 \| good	0.107 \| good
2025-06-07T05:00:00.000Z	28 \| good	4.858 \| good	5.563 \| good	29.627 \| good	0.07 \| good	1.378 \| good	0.107 \| good
2025-06-07T06:00:00.000Z	28 \| good	5.114 \| good	7.058 \| good	30.175 \| good	0.086 \| good	1.286 \| good	0.108 \| good
2025-06-07T07:00:00.000Z	29 \| good	5.055 \| good	7.641 \| good	30.805 \| good	0.109 \| good	1.333 \| good	0.112 \| good
2025-06-07T08:00:00.000Z	29 \| good	4.435 \| good	7.029 \| good	31.397 \| good	0.13 \| good	1.539 \| good	0.117 \| good
2025-06-07T09:00:00.000Z	30 \| good	3.689 \| good	5.527 \| good	31.683 \| good	0.142 \| good	1.755 \| good	0.121 \| good
2025-06-07T10:00:00.000Z	31 \| good	2.982 \| good	3.934 \| good	33.378 \| good	0.131 \| good	1.983 \| good	0.123 \| good
2025-06-07T11:00:00.000Z	32 \| good	2.739 \| good	3.752 \| good	34.803 \| good	0.109 \| good	1.845 \| good	0.125 \| good
2025-06-07T12:00:00.000Z	34 \| good	3.011 \| good	3.852 \| good	36.573 \| good	0.082 \| good	1.708 \| good	0.125 \| good
2025-06-07T13:00:00.000Z	35 \| good	3.19 \| good	4.116 \| good	37.74 \| good	0.071 \| good	1.513 \| good	0.124 \| good
2025-06-07T14:00:00.000Z	36 \| good	3.637 \| good	4.69 \| good	38.687 \| good	0.068 \| good	1.402 \| good	0.123 \| good
2025-06-07T15:00:00.000Z	36 \| good	4.238 \| good	5.197 \| good	38.784 \| good	0.065 \| good	1.353 \| good	0.121 \| good
2025-06-07T16:00:00.000Z	32 \| good	3.365 \| good	4.229 \| good	35.176 \| good	0.066 \| good	1.386 \| good	0.118 \| good
2025-06-07T17:00:00.000Z	33 \| good	2.977 \| good	3.989 \| good	35.766 \| good	0.071 \| good	1.605 \| good	0.117 \| good
2025-06-07T18:00:00.000Z	34 \| good	2.925 \| good	4.715 \| good	36.681 \| good	0.087 \| good	1.774 \| good	0.119 \| good
2025-06-07T19:00:00.000Z	32 \| good	2.761 \| good	4.289 \| good	34.893 \| good	0.102 \| good	2.063 \| good	0.118 \| good
2025-06-07T20:00:00.000Z	30 \| good	2.689 \| good	3.754 \| good	32.443 \| good	0.102 \| good	2.163 \| good	0.117 \| good
2025-06-07T21:00:00.000Z	29 \| good	2.586 \| good	3.466 \| good	30.981 \| good	0.115 \| good	2.42 \| good	0.119 \| good
2025-06-07T22:00:00.000Z	28 \| good	2.475 \| good	3.053 \| good	30.496 \| good	0.106 \| good	2.506 \| good	0.122 \| good
2025-06-07T23:00:00.000Z	30 \| good	2.636 \| good	3.549 \| good	31.834 \| good	0.097 \| good	2.526 \| good	0.114 \| good
2025-06-08T00:00:00.000Z	31 \| good	3.144 \| good	4.706 \| good	33.138 \| good	0.104 \| good	2.129 \| good	0.108 \| good
2025-06-08T01:00:00.000Z	25 \| good	2.358 \| good	2.527 \| good	26.568 \| good	0.539 \| good	2.775 \| good	0.11 \| good
2025-06-08T02:00:00.000Z	25 \| good	2.057 \| good	2.298 \| good	26.515 \| good	0.569 \| good	2.909 \| good	0.11 \| good
2025-06-08T03:00:00.000Z	24 \| good	1.924 \| good	2.251 \| good	26.463 \| good	0.6 \| good	3.043 \| good	0.111 \| good
2025-06-08T04:00:00.000Z	24 \| good	1.862 \| good	2.297 \| good	25.741 \| good	0.489 \| good	1.722 \| good	0.103 \| good
2025-06-08T05:00:00.000Z	24 \| good	1.919 \| good	2.434 \| good	25.654 \| good	0.523 \| good	1.808 \| good	0.103 \| good
2025-06-08T06:00:00.000Z	24 \| good	1.959 \| good	2.489 \| good	25.567 \| good	0.558 \| good	1.894 \| good	0.104 \| good
2025-06-08T07:00:00.000Z	33 \| good	2.628 \| good	3.473 \| good	36.259 \| good	0.416 \| good	1.282 \| good	0.095 \| good

Live air quality index in Hertfordshire, UK today

Major air pollutants in Hertfordshire, UK

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Hertfordshire, UK air quality forecast and history

Get reliable air quality data to drive your business

Hertfordshire, UK air quality map: Track AQI near you

Air quality in cities of Hertfordshire, UK

Air quality in nearby states

Central Bedfordshire, UK

Greater London, UK

Halton, UK

Buckinghamshire, UK

Bedford, UK

Milton Keynes, UK

How accurate is Hertfordshire, UK air quality data?

Air quality levels in UK

Frequently asked questions

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

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

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

What is the current air quality in Hertfordshire, UK?

What pollutant is the most common in Hertfordshire, UK?

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

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

What is the current concentration of PM10 in Hertfordshire, UK?

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

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

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

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

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the current concentration of PM_2.5 in Hertfordshire, UK?

What is the current concentration of PM₁₀ in Hertfordshire, UK?

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

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

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