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

The current PM10 concentration at Hertfordshire, UK is 19.111 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.703 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 31.136 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 7.396 ppb.

Hertfordshire, UK live air quality index now

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)

3.28 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

9.92 μg/m³

155

255

425

605+

Ozone (O₃)

19.76 ppb

201

201+

Sulfur Dioxide (SO₂)

0.51 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

2.82 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.20 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
2025-08-29T04:00:00.000Z	27 \| good	5.34 \| good	11.952 \| good	25.209 \| good	0.663 \| good	3.965 \| good	0.262 \| good
2025-08-29T05:00:00.000Z	27 \| good	5.091 \| good	10.311 \| good	28.666 \| good	0.542 \| good	2.898 \| good	0.335 \| good
2025-08-29T06:00:00.000Z	27 \| good	5.117 \| good	20.6 \| good	27.018 \| good	0.542 \| good	5.22 \| good	0.015 \| good
2025-08-29T07:00:00.000Z	33 \| good	6.021 \| good	13.439 \| good	30.942 \| good	0.542 \| good	4.574 \| good	0.017 \| good
2025-08-29T08:00:00.000Z	26 \| good	3.305 \| good	13.161 \| good	27.776 \| good	0.612 \| good	6.424 \| good	0.018 \| good
2025-08-29T09:00:00.000Z	22 \| good	3.88 \| good	9.82 \| good	20.319 \| good	0.563 \| good	7.245 \| good	0.017 \| good
2025-08-29T10:00:00.000Z	19 \| good	3.017 \| good	10.448 \| good	20.287 \| good	0.564 \| good	9.048 \| good	0.017 \| good
2025-08-29T11:00:00.000Z	24 \| good	3.608 \| good	9.04 \| good	26.244 \| good	0.481 \| good	14.588 \| good	0.015 \| good
2025-08-29T12:00:00.000Z	26 \| good	3.876 \| good	9.165 \| good	28.41 \| good	0.49 \| good	7.905 \| good	0.015 \| good
2025-08-29T13:00:00.000Z	23 \| good	3.821 \| good	10.567 \| good	24.86 \| good	0.483 \| good	5.227 \| good	0.014 \| good
2025-08-29T14:00:00.000Z	28 \| good	3.623 \| good	10.551 \| good	29.501 \| good	0.542 \| good	8.078 \| good	0.015 \| good
2025-08-29T15:00:00.000Z	30 \| good	3.791 \| good	11.2 \| good	31.991 \| good	0.409 \| good	9.498 \| good	0.015 \| good
2025-08-29T16:00:00.000Z	25 \| good	3.707 \| good	10.695 \| good	27.094 \| good	0.563 \| good	11.585 \| good	0.015 \| good
2025-08-29T17:00:00.000Z	27 \| good	4.035 \| good	14.816 \| good	29.474 \| good	0.564 \| good	12.015 \| good	0.016 \| good
2025-08-29T18:00:00.000Z	25 \| good	4.134 \| good	13.229 \| good	27.011 \| good	0.563 \| good	7.89 \| good	0.017 \| good
2025-08-29T19:00:00.000Z	26 \| good	4.055 \| good	15.717 \| good	28.289 \| good	0.563 \| good	8.993 \| good	0.016 \| good
2025-08-29T20:00:00.000Z	25 \| good	4.251 \| good	14.86 \| good	26.755 \| good	0.612 \| good	7.868 \| good	0.018 \| good
2025-08-29T21:00:00.000Z	23 \| good	3.936 \| good	15.59 \| good	24.768 \| good	0.563 \| good	7.47 \| good	0.015 \| good
2025-08-29T22:00:00.000Z	23 \| good	3.914 \| good	15.461 \| good	25.122 \| good	0.541 \| good	5.724 \| good	0.014 \| good
2025-08-29T23:00:00.000Z	24 \| good	3.885 \| good	16.102 \| good	26.457 \| good	0.458 \| good	5.947 \| good	0.012 \| good
2025-08-30T00:00:00.000Z	22 \| good	4.036 \| good	13.668 \| good	21.481 \| good	0.753 \| good	7.061 \| good	0.235 \| good
2025-08-30T01:00:00.000Z	22 \| good	3.934 \| good	15.804 \| good	15.036 \| good	0.669 \| good	4.884 \| good	0.226 \| good
2025-08-30T02:00:00.000Z	27 \| good	5.005 \| good	16.992 \| good	13.988 \| good	0.566 \| good	4.721 \| good	0.249 \| good
2025-08-30T03:00:00.000Z	44 \| good	7.68 \| good	16.096 \| good	13.754 \| good	0.599 \| good	6.39 \| good	0.226 \| good
2025-08-30T04:00:00.000Z	22 \| good	3.579 \| good	11.69 \| good	12.246 \| good	0.472 \| good	8.075 \| good	0.23 \| good
2025-08-30T05:00:00.000Z	27 \| good	5.037 \| good	14.76 \| good	10.867 \| good	0.576 \| good	5.737 \| good	0.005 \| good
2025-08-30T06:00:00.000Z	27 \| good	4.762 \| good	11.089 \| good	10.254 \| good	0.679 \| good	7.009 \| good	0.007 \| good
2025-08-30T07:00:00.000Z	16 \| good	3.462 \| good	10.463 \| good	14.611 \| good	0.583 \| good	6.016 \| good	0.006 \| good
2025-08-30T08:00:00.000Z	16 \| good	3.24 \| good	14.681 \| good	11.582 \| good	0.586 \| good	5.49 \| good	0.006 \| good
2025-08-30T09:00:00.000Z	22 \| good	3.535 \| good	16.162 \| good	16.545 \| good	0.584 \| good	5.505 \| good	0.006 \| good
2025-08-30T10:00:00.000Z	22 \| good	3.906 \| good	13.376 \| good	12.5 \| good	0.657 \| good	4.742 \| good	0.005 \| good
2025-08-30T11:00:00.000Z	22 \| good	3.889 \| good	9.669 \| good	13.35 \| good	0.504 \| good	3.938 \| good	0.005 \| good
2025-08-30T12:00:00.000Z	33 \| good	6.182 \| good	13.911 \| good	13.717 \| good	0.807 \| good	4.034 \| good	0.005 \| good
2025-08-30T13:00:00.000Z	27 \| good	4.872 \| good	10.52 \| good	16.021 \| good	0.732 \| good	4.251 \| good	0.004 \| good
2025-08-30T14:00:00.000Z	22 \| good	3.884 \| good	10.796 \| good	20.263 \| good	0.578 \| good	5.139 \| good	0.005 \| good
2025-08-30T15:00:00.000Z	22 \| good	3.582 \| good	12.74 \| good	18.809 \| good	0.657 \| good	3.585 \| good	0.005 \| good
2025-08-30T16:00:00.000Z	27 \| good	4.953 \| good	19.68 \| good	16.941 \| good	0.584 \| good	5.353 \| good	0.005 \| good
2025-08-30T17:00:00.000Z	16 \| good	3.079 \| good	8.849 \| good	15.578 \| good	0.732 \| good	5.821 \| good	0.005 \| good
2025-08-30T18:00:00.000Z	33 \| good	6.195 \| good	11.167 \| good	19.926 \| good	0.731 \| good	5.933 \| good	0.007 \| good
2025-08-30T19:00:00.000Z	27 \| good	5.107 \| good	13.723 \| good	19.353 \| good	0.731 \| good	9.397 \| good	0.005 \| good
2025-08-30T20:00:00.000Z	16 \| good	3.324 \| good	12.085 \| good	16.915 \| good	0.504 \| good	5.943 \| good	0.006 \| good
2025-08-30T21:00:00.000Z	33 \| good	5.579 \| good	14.793 \| good	19.978 \| good	0.578 \| good	11.241 \| good	0.005 \| good
2025-08-30T22:00:00.000Z	22 \| good	3.573 \| good	12.007 \| good	19.83 \| good	0.657 \| good	5.215 \| good	0.004 \| good
2025-08-30T23:00:00.000Z	27 \| good	5.409 \| good	11.885 \| good	15.396 \| good	0.657 \| good	4.351 \| good	0.004 \| good
2025-08-31T00:00:00.000Z	22 \| good	3.538 \| good	11.394 \| good	19.083 \| good	0.564 \| good	2.887 \| good	0.211 \| good
2025-08-31T01:00:00.000Z	16 \| good	3.362 \| good	9.606 \| good	17.049 \| good	0.664 \| good	2.706 \| good	0.207 \| good
2025-08-31T02:00:00.000Z	18 \| good	2.873 \| good	10.997 \| good	19.25 \| good	0.516 \| good	2.346 \| good	0.2 \| good
2025-08-31T03:00:00.000Z	19 \| good	3.284 \| good	9.917 \| good	19.762 \| good	0.512 \| good	2.822 \| good	0.2 \| good
2025-08-26T17:00:00.000Z	31 \| good	4.028 \| good	8.699 \| good	33.492 \| good	0.116 \| good	2.513 \| good	0.122 \| good
2025-08-26T18:00:00.000Z	31 \| good	4.528 \| good	9.146 \| good	32.704 \| good	0.133 \| good	2.798 \| good	0.121 \| good
2025-08-26T19:00:00.000Z	33 \| good	5.896 \| good	9.992 \| good	31.96 \| good	0.164 \| good	2.921 \| good	0.122 \| good
2025-08-26T20:00:00.000Z	33 \| good	6.315 \| good	11.41 \| good	30.508 \| good	0.192 \| good	3.641 \| good	0.125 \| good
2025-08-26T21:00:00.000Z	33 \| good	6.316 \| good	11.335 \| good	28.908 \| good	0.213 \| good	3.865 \| good	0.128 \| good
2025-08-26T22:00:00.000Z	38 \| good	6.542 \| good	11.754 \| good	27.792 \| good	0.219 \| good	3.988 \| good	0.129 \| good
2025-08-26T23:00:00.000Z	38 \| good	6.627 \| good	13.541 \| good	26.287 \| good	0.202 \| good	4.113 \| good	0.129 \| good
2025-08-27T00:00:00.000Z	38 \| good	6.507 \| good	14.529 \| good	25.344 \| good	0.189 \| good	3.961 \| good	0.128 \| good
2025-08-27T01:00:00.000Z	38 \| good	6.561 \| good	14.788 \| good	24.917 \| good	0.173 \| good	3.704 \| good	0.126 \| good
2025-08-27T02:00:00.000Z	38 \| good	7.087 \| good	15.283 \| good	23.717 \| good	0.172 \| good	3.314 \| good	0.125 \| good
2025-08-27T03:00:00.000Z	44 \| good	7.74 \| good	16.094 \| good	23.217 \| good	0.166 \| good	3.128 \| good	0.125 \| good
2025-08-27T04:00:00.000Z	38 \| good	7.345 \| good	16.4 \| good	24.128 \| good	0.182 \| good	2.771 \| good	0.125 \| good
2025-08-27T05:00:00.000Z	38 \| good	7.4 \| good	15.672 \| good	24.889 \| good	0.206 \| good	2.753 \| good	0.125 \| good
2025-08-27T06:00:00.000Z	44 \| good	8.437 \| good	15.216 \| good	24.467 \| good	0.289 \| good	3.913 \| good	0.127 \| good
2025-08-27T07:00:00.000Z	49 \| good	9.041 \| good	15.275 \| good	24.981 \| good	0.383 \| good	5.439 \| good	0.131 \| good
2025-08-27T08:00:00.000Z	49 \| good	8.887 \| good	15.213 \| good	28.008 \| good	0.393 \| good	5.306 \| good	0.132 \| good
2025-08-27T09:00:00.000Z	44 \| good	8.249 \| good	16.516 \| good	29.412 \| good	0.273 \| good	5.137 \| good	0.133 \| good
2025-08-27T10:00:00.000Z	44 \| good	7.517 \| good	15.742 \| good	28.471 \| good	0.25 \| good	4.639 \| good	0.131 \| good
2025-08-27T11:00:00.000Z	38 \| good	6.81 \| good	12.807 \| good	33.141 \| good	0.273 \| good	3.435 \| good	0.128 \| good
2025-08-27T12:00:00.000Z	34 \| good	6.226 \| good	10.844 \| good	37.005 \| good	0.235 \| good	2.683 \| good	0.126 \| good
2025-08-27T13:00:00.000Z	35 \| good	5.912 \| good	11.344 \| good	37.525 \| good	0.181 \| good	2.483 \| good	0.125 \| good
2025-08-27T14:00:00.000Z	34 \| good	5.66 \| good	10.412 \| good	37.388 \| good	0.145 \| good	2.458 \| good	0.124 \| good
2025-08-27T15:00:00.000Z	34 \| good	5.369 \| good	9.556 \| good	37.439 \| good	0.141 \| good	2.8 \| good	0.123 \| good
2025-08-27T16:00:00.000Z	33 \| good	4.701 \| good	10.012 \| good	36.486 \| good	0.151 \| good	3.473 \| good	0.123 \| good
2025-08-27T17:00:00.000Z	33 \| good	4.911 \| good	8.599 \| good	35.744 \| good	0.15 \| good	4.201 \| good	0.124 \| good
2025-08-27T18:00:00.000Z	32 \| good	4.957 \| good	6.846 \| good	34.9 \| good	0.167 \| good	5.126 \| good	0.124 \| good
2025-08-27T19:00:00.000Z	31 \| good	4.902 \| good	6.56 \| good	33.743 \| good	0.196 \| good	6.028 \| good	0.126 \| good
2025-08-27T20:00:00.000Z	30 \| good	4.765 \| good	6.328 \| good	32.42 \| good	0.2 \| good	5.545 \| good	0.123 \| good
2025-08-27T21:00:00.000Z	29 \| good	4.728 \| good	6.327 \| good	31.31 \| good	0.222 \| good	5.715 \| good	0.123 \| good
2025-08-27T22:00:00.000Z	27 \| good	5.063 \| good	6.46 \| good	28.283 \| good	0.234 \| good	6.071 \| good	0.125 \| good
2025-08-27T23:00:00.000Z	27 \| good	5.31 \| good	6.741 \| good	25.982 \| good	0.226 \| good	6.75 \| good	0.125 \| good
2025-08-28T00:00:00.000Z	33 \| good	5.811 \| good	7.494 \| good	23.911 \| good	0.194 \| good	6.42 \| good	0.125 \| good
2025-08-28T01:00:00.000Z	33 \| good	6.222 \| good	8 \| good	22.442 \| good	0.168 \| good	5.361 \| good	0.124 \| good
2025-08-28T02:00:00.000Z	33 \| good	6.365 \| good	8.491 \| good	22.224 \| good	0.167 \| good	4.677 \| good	0.125 \| good
2025-08-28T03:00:00.000Z	38 \| good	6.707 \| good	9.435 \| good	20.814 \| good	0.183 \| good	3.89 \| good	0.126 \| good
2025-08-28T04:00:00.000Z	33 \| good	6.307 \| good	10.121 \| good	19.632 \| good	0.202 \| good	3.094 \| good	0.126 \| good
2025-08-28T05:00:00.000Z	33 \| good	6.412 \| good	10.265 \| good	19.247 \| good	0.202 \| good	3.244 \| good	0.126 \| good
2025-08-28T06:00:00.000Z	33 \| good	6.468 \| good	12.458 \| good	18.267 \| good	0.231 \| good	5.008 \| good	0.13 \| good
2025-08-28T07:00:00.000Z	33 \| good	5.715 \| good	10.709 \| good	20.367 \| good	0.263 \| good	5.199 \| good	0.131 \| good
2025-08-28T08:00:00.000Z	27 \| good	4.945 \| good	11.562 \| good	24.776 \| good	0.196 \| good	4.37 \| good	0.13 \| good
2025-08-28T09:00:00.000Z	27 \| good	4.683 \| good	10.695 \| good	28.923 \| good	0.2 \| good	3.522 \| good	0.127 \| good
2025-08-28T10:00:00.000Z	30 \| good	4.712 \| good	11.583 \| good	31.68 \| good	0.2 \| good	3.088 \| good	0.126 \| good
2025-08-28T11:00:00.000Z	31 \| good	4.519 \| good	11.235 \| good	34.475 \| good	0.203 \| good	2.749 \| good	0.123 \| good
2025-08-28T12:00:00.000Z	34 \| good	4.251 \| good	9.157 \| good	36.802 \| good	0.222 \| good	2.565 \| good	0.122 \| good
2025-08-28T13:00:00.000Z	33 \| good	3.643 \| good	6.133 \| good	36.454 \| good	0.212 \| good	2.575 \| good	0.121 \| good
2025-08-28T14:00:00.000Z	34 \| good	3.085 \| good	5.464 \| good	36.657 \| good	0.18 \| good	2.409 \| good	0.121 \| good
2025-08-28T15:00:00.000Z	31 \| good	2.933 \| good	4.763 \| good	33.65 \| good	0.15 \| good	2.689 \| good	0.121 \| good
2025-08-28T16:00:00.000Z	30 \| good	3.357 \| good	4.883 \| good	32.127 \| good	0.134 \| good	3.041 \| good	0.123 \| 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
Hertford, Hertfordshire	22 Good	4.26μg/m³ Good	7.62μg/m³ Good	18.71ppb Good	0.67ppb Good	2.05ppb Good	0.21ppm Good
Hoddesdon, Hertfordshire	22 Good	4.26μg/m³ Good	7.62μg/m³ Good	18.71ppb Good	0.67ppb Good	2.05ppb Good	0.21ppm Good
Royston, Hertfordshire	22 Good	4.04μg/m³ Good	9.72μg/m³ Good	19.75ppb Good	0.63ppb Good	2.67ppb Good	0.21ppm Good
Hatfield, Hertfordshire	22 Good	3.86μg/m³ Good	7.61μg/m³ Good	17.48ppb Good	0.67ppb Good	2.94ppb Good	0.21ppm Good
Baldock, Hertfordshire	22 Good	3.81μg/m³ Good	9.88μg/m³ Good	17.15ppb Good	0.65ppb Good	2.69ppb Good	0.21ppm Good
Stevenage, Hertfordshire	22 Good	3.81μg/m³ Good	10.52μg/m³ Good	17.22ppb Good	0.66ppb Good	2.80ppb Good	0.21ppm Good
Letchworth, Hertfordshire	22 Good	3.81μg/m³ Good	10.52μg/m³ Good	17.22ppb Good	0.66ppb Good	2.80ppb Good	0.21ppm Good
Hitchin, Hertfordshire	22 Good	3.81μg/m³ Good	10.52μg/m³ Good	17.22ppb Good	0.66ppb Good	2.80ppb Good	0.21ppm Good
Tring, Hertfordshire	22 Good	3.82μg/m³ Good	9.60μg/m³ Good	15.32ppb Good	0.62ppb Good	2.14ppb Good	0.21ppm Good
Cheshunt, Hertfordshire	22 Good	3.66μg/m³ Good	9.26μg/m³ Good	17.36ppb Good	0.64ppb Good	3.05ppb Good	0.21ppm Good
Harpenden, Hertfordshire	22 Good	3.66μg/m³ Good	10.17μg/m³ Good	16.93ppb Good	0.67ppb Good	3.05ppb Good	0.21ppm Good
Abbots Langley, Hertfordshire	22 Good	3.63μg/m³ Good	9.63μg/m³ Good	16.84ppb Good	0.67ppb Good	3.06ppb Good	0.21ppm Good
Berkhamsted, Hertfordshire	22 Good	3.57μg/m³ Good	9.97μg/m³ Good	17.10ppb Good	0.67ppb Good	2.42ppb Good	0.21ppm Good
Bishop's Stortford, Hertfordshire	19 Good	2.55μg/m³ Good	7.63μg/m³ Good	21.22ppb Good	0.68ppb Good	1.48ppb Good	0.21ppm Good
Hemel Hempstead, Hertfordshire	22 Good	3.63μg/m³ Good	9.63μg/m³ Good	16.84ppb Good	0.67ppb Good	3.06ppb Good	0.21ppm Good
Sawbridgeworth, Hertfordshire	19 Good	2.55μg/m³ Good	7.63μg/m³ Good	21.22ppb Good	0.68ppb Good	1.48ppb Good	0.21ppm Good
Ware, Hertfordshire	22 Good	3.57μg/m³ Good	7.61μg/m³ Good	19.48ppb Good	0.66ppb Good	2.59ppb Good	0.21ppm Good
Bushey, Hertfordshire	19 Good	2.76μg/m³ Good	6.75μg/m³ Good	20.44ppb Good	0.73ppb Good	5.49ppb Good	0.21ppm Good
Potters Bar, Hertfordshire	16 Good	3.41μg/m³ Good	8.56μg/m³ Good	17.39ppb Good	0.65ppb Good	3.14ppb Good	0.21ppm Good
Waltham Cross, Hertfordshire	17 Good	3.48μg/m³ Good	9.61μg/m³ Good	17.52ppb Good	0.65ppb Good	2.98ppb Good	0.21ppm Good
Watford, Hertfordshire	16 Good	3.37μg/m³ Good	7.60μg/m³ Good	16.15ppb Good	0.68ppb Good	3.28ppb Good	0.21ppm Good
St Albans, Hertfordshire	18 Good	3.26μg/m³ Good	8.97μg/m³ Good	19.00ppb Good	0.70ppb Good	4.54ppb Good	0.21ppm Good
Welwyn Garden City, Hertfordshire	16 Good	3.36μg/m³ Good	9.61μg/m³ Good	17.05ppb Good	0.66ppb Good	2.71ppb Good	0.21ppm Good
Chorleywood, Hertfordshire	16 Good	3.08μg/m³ Good	7.62μg/m³ Good	16.04ppb Good	0.68ppb Good	2.62ppb Good	0.21ppm Good
Rickmansworth, Hertfordshire	16 Good	3.08μg/m³ Good	7.62μg/m³ Good	16.04ppb Good	0.68ppb Good	2.62ppb Good	0.21ppm Good
Borehamwood, Hertfordshire	17 Good	3.02μg/m³ Good	7.03μg/m³ Good	17.91ppb Good	0.69ppb Good	2.31ppb Good	0.21ppm 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

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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 05:00:00 on 2025-08-26.

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 11:00:00 on 2025-08-26.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 38, 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 6.597 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 19.111 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.013 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.703 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 31.136 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 7.396 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-08-29T04:00:00.000Z	27 \| good	5.34 \| good	11.952 \| good	25.209 \| good	0.663 \| good	3.965 \| good	0.262 \| good
2025-08-29T05:00:00.000Z	27 \| good	5.091 \| good	10.311 \| good	28.666 \| good	0.542 \| good	2.898 \| good	0.335 \| good
2025-08-29T06:00:00.000Z	27 \| good	5.117 \| good	20.6 \| good	27.018 \| good	0.542 \| good	5.22 \| good	0.015 \| good
2025-08-29T07:00:00.000Z	33 \| good	6.021 \| good	13.439 \| good	30.942 \| good	0.542 \| good	4.574 \| good	0.017 \| good
2025-08-29T08:00:00.000Z	26 \| good	3.305 \| good	13.161 \| good	27.776 \| good	0.612 \| good	6.424 \| good	0.018 \| good
2025-08-29T09:00:00.000Z	22 \| good	3.88 \| good	9.82 \| good	20.319 \| good	0.563 \| good	7.245 \| good	0.017 \| good
2025-08-29T10:00:00.000Z	19 \| good	3.017 \| good	10.448 \| good	20.287 \| good	0.564 \| good	9.048 \| good	0.017 \| good
2025-08-29T11:00:00.000Z	24 \| good	3.608 \| good	9.04 \| good	26.244 \| good	0.481 \| good	14.588 \| good	0.015 \| good
2025-08-29T12:00:00.000Z	26 \| good	3.876 \| good	9.165 \| good	28.41 \| good	0.49 \| good	7.905 \| good	0.015 \| good
2025-08-29T13:00:00.000Z	23 \| good	3.821 \| good	10.567 \| good	24.86 \| good	0.483 \| good	5.227 \| good	0.014 \| good
2025-08-29T14:00:00.000Z	28 \| good	3.623 \| good	10.551 \| good	29.501 \| good	0.542 \| good	8.078 \| good	0.015 \| good
2025-08-29T15:00:00.000Z	30 \| good	3.791 \| good	11.2 \| good	31.991 \| good	0.409 \| good	9.498 \| good	0.015 \| good
2025-08-29T16:00:00.000Z	25 \| good	3.707 \| good	10.695 \| good	27.094 \| good	0.563 \| good	11.585 \| good	0.015 \| good
2025-08-29T17:00:00.000Z	27 \| good	4.035 \| good	14.816 \| good	29.474 \| good	0.564 \| good	12.015 \| good	0.016 \| good
2025-08-29T18:00:00.000Z	25 \| good	4.134 \| good	13.229 \| good	27.011 \| good	0.563 \| good	7.89 \| good	0.017 \| good
2025-08-29T19:00:00.000Z	26 \| good	4.055 \| good	15.717 \| good	28.289 \| good	0.563 \| good	8.993 \| good	0.016 \| good
2025-08-29T20:00:00.000Z	25 \| good	4.251 \| good	14.86 \| good	26.755 \| good	0.612 \| good	7.868 \| good	0.018 \| good
2025-08-29T21:00:00.000Z	23 \| good	3.936 \| good	15.59 \| good	24.768 \| good	0.563 \| good	7.47 \| good	0.015 \| good
2025-08-29T22:00:00.000Z	23 \| good	3.914 \| good	15.461 \| good	25.122 \| good	0.541 \| good	5.724 \| good	0.014 \| good
2025-08-29T23:00:00.000Z	24 \| good	3.885 \| good	16.102 \| good	26.457 \| good	0.458 \| good	5.947 \| good	0.012 \| good
2025-08-30T00:00:00.000Z	22 \| good	4.036 \| good	13.668 \| good	21.481 \| good	0.753 \| good	7.061 \| good	0.235 \| good
2025-08-30T01:00:00.000Z	22 \| good	3.934 \| good	15.804 \| good	15.036 \| good	0.669 \| good	4.884 \| good	0.226 \| good
2025-08-30T02:00:00.000Z	27 \| good	5.005 \| good	16.992 \| good	13.988 \| good	0.566 \| good	4.721 \| good	0.249 \| good
2025-08-30T03:00:00.000Z	44 \| good	7.68 \| good	16.096 \| good	13.754 \| good	0.599 \| good	6.39 \| good	0.226 \| good
2025-08-30T04:00:00.000Z	22 \| good	3.579 \| good	11.69 \| good	12.246 \| good	0.472 \| good	8.075 \| good	0.23 \| good
2025-08-30T05:00:00.000Z	27 \| good	5.037 \| good	14.76 \| good	10.867 \| good	0.576 \| good	5.737 \| good	0.005 \| good
2025-08-30T06:00:00.000Z	27 \| good	4.762 \| good	11.089 \| good	10.254 \| good	0.679 \| good	7.009 \| good	0.007 \| good
2025-08-30T07:00:00.000Z	16 \| good	3.462 \| good	10.463 \| good	14.611 \| good	0.583 \| good	6.016 \| good	0.006 \| good
2025-08-30T08:00:00.000Z	16 \| good	3.24 \| good	14.681 \| good	11.582 \| good	0.586 \| good	5.49 \| good	0.006 \| good
2025-08-30T09:00:00.000Z	22 \| good	3.535 \| good	16.162 \| good	16.545 \| good	0.584 \| good	5.505 \| good	0.006 \| good
2025-08-30T10:00:00.000Z	22 \| good	3.906 \| good	13.376 \| good	12.5 \| good	0.657 \| good	4.742 \| good	0.005 \| good
2025-08-30T11:00:00.000Z	22 \| good	3.889 \| good	9.669 \| good	13.35 \| good	0.504 \| good	3.938 \| good	0.005 \| good
2025-08-30T12:00:00.000Z	33 \| good	6.182 \| good	13.911 \| good	13.717 \| good	0.807 \| good	4.034 \| good	0.005 \| good
2025-08-30T13:00:00.000Z	27 \| good	4.872 \| good	10.52 \| good	16.021 \| good	0.732 \| good	4.251 \| good	0.004 \| good
2025-08-30T14:00:00.000Z	22 \| good	3.884 \| good	10.796 \| good	20.263 \| good	0.578 \| good	5.139 \| good	0.005 \| good
2025-08-30T15:00:00.000Z	22 \| good	3.582 \| good	12.74 \| good	18.809 \| good	0.657 \| good	3.585 \| good	0.005 \| good
2025-08-30T16:00:00.000Z	27 \| good	4.953 \| good	19.68 \| good	16.941 \| good	0.584 \| good	5.353 \| good	0.005 \| good
2025-08-30T17:00:00.000Z	16 \| good	3.079 \| good	8.849 \| good	15.578 \| good	0.732 \| good	5.821 \| good	0.005 \| good
2025-08-30T18:00:00.000Z	33 \| good	6.195 \| good	11.167 \| good	19.926 \| good	0.731 \| good	5.933 \| good	0.007 \| good
2025-08-30T19:00:00.000Z	27 \| good	5.107 \| good	13.723 \| good	19.353 \| good	0.731 \| good	9.397 \| good	0.005 \| good
2025-08-30T20:00:00.000Z	16 \| good	3.324 \| good	12.085 \| good	16.915 \| good	0.504 \| good	5.943 \| good	0.006 \| good
2025-08-30T21:00:00.000Z	33 \| good	5.579 \| good	14.793 \| good	19.978 \| good	0.578 \| good	11.241 \| good	0.005 \| good
2025-08-30T22:00:00.000Z	22 \| good	3.573 \| good	12.007 \| good	19.83 \| good	0.657 \| good	5.215 \| good	0.004 \| good
2025-08-30T23:00:00.000Z	27 \| good	5.409 \| good	11.885 \| good	15.396 \| good	0.657 \| good	4.351 \| good	0.004 \| good
2025-08-31T00:00:00.000Z	22 \| good	3.538 \| good	11.394 \| good	19.083 \| good	0.564 \| good	2.887 \| good	0.211 \| good
2025-08-31T01:00:00.000Z	16 \| good	3.362 \| good	9.606 \| good	17.049 \| good	0.664 \| good	2.706 \| good	0.207 \| good
2025-08-31T02:00:00.000Z	18 \| good	2.873 \| good	10.997 \| good	19.25 \| good	0.516 \| good	2.346 \| good	0.2 \| good
2025-08-31T03:00:00.000Z	19 \| good	3.284 \| good	9.917 \| good	19.762 \| good	0.512 \| good	2.822 \| good	0.2 \| good
2025-08-26T17:00:00.000Z	31 \| good	4.028 \| good	8.699 \| good	33.492 \| good	0.116 \| good	2.513 \| good	0.122 \| good
2025-08-26T18:00:00.000Z	31 \| good	4.528 \| good	9.146 \| good	32.704 \| good	0.133 \| good	2.798 \| good	0.121 \| good
2025-08-26T19:00:00.000Z	33 \| good	5.896 \| good	9.992 \| good	31.96 \| good	0.164 \| good	2.921 \| good	0.122 \| good
2025-08-26T20:00:00.000Z	33 \| good	6.315 \| good	11.41 \| good	30.508 \| good	0.192 \| good	3.641 \| good	0.125 \| good
2025-08-26T21:00:00.000Z	33 \| good	6.316 \| good	11.335 \| good	28.908 \| good	0.213 \| good	3.865 \| good	0.128 \| good
2025-08-26T22:00:00.000Z	38 \| good	6.542 \| good	11.754 \| good	27.792 \| good	0.219 \| good	3.988 \| good	0.129 \| good
2025-08-26T23:00:00.000Z	38 \| good	6.627 \| good	13.541 \| good	26.287 \| good	0.202 \| good	4.113 \| good	0.129 \| good
2025-08-27T00:00:00.000Z	38 \| good	6.507 \| good	14.529 \| good	25.344 \| good	0.189 \| good	3.961 \| good	0.128 \| good
2025-08-27T01:00:00.000Z	38 \| good	6.561 \| good	14.788 \| good	24.917 \| good	0.173 \| good	3.704 \| good	0.126 \| good
2025-08-27T02:00:00.000Z	38 \| good	7.087 \| good	15.283 \| good	23.717 \| good	0.172 \| good	3.314 \| good	0.125 \| good
2025-08-27T03:00:00.000Z	44 \| good	7.74 \| good	16.094 \| good	23.217 \| good	0.166 \| good	3.128 \| good	0.125 \| good
2025-08-27T04:00:00.000Z	38 \| good	7.345 \| good	16.4 \| good	24.128 \| good	0.182 \| good	2.771 \| good	0.125 \| good
2025-08-27T05:00:00.000Z	38 \| good	7.4 \| good	15.672 \| good	24.889 \| good	0.206 \| good	2.753 \| good	0.125 \| good
2025-08-27T06:00:00.000Z	44 \| good	8.437 \| good	15.216 \| good	24.467 \| good	0.289 \| good	3.913 \| good	0.127 \| good
2025-08-27T07:00:00.000Z	49 \| good	9.041 \| good	15.275 \| good	24.981 \| good	0.383 \| good	5.439 \| good	0.131 \| good
2025-08-27T08:00:00.000Z	49 \| good	8.887 \| good	15.213 \| good	28.008 \| good	0.393 \| good	5.306 \| good	0.132 \| good
2025-08-27T09:00:00.000Z	44 \| good	8.249 \| good	16.516 \| good	29.412 \| good	0.273 \| good	5.137 \| good	0.133 \| good
2025-08-27T10:00:00.000Z	44 \| good	7.517 \| good	15.742 \| good	28.471 \| good	0.25 \| good	4.639 \| good	0.131 \| good
2025-08-27T11:00:00.000Z	38 \| good	6.81 \| good	12.807 \| good	33.141 \| good	0.273 \| good	3.435 \| good	0.128 \| good
2025-08-27T12:00:00.000Z	34 \| good	6.226 \| good	10.844 \| good	37.005 \| good	0.235 \| good	2.683 \| good	0.126 \| good
2025-08-27T13:00:00.000Z	35 \| good	5.912 \| good	11.344 \| good	37.525 \| good	0.181 \| good	2.483 \| good	0.125 \| good
2025-08-27T14:00:00.000Z	34 \| good	5.66 \| good	10.412 \| good	37.388 \| good	0.145 \| good	2.458 \| good	0.124 \| good
2025-08-27T15:00:00.000Z	34 \| good	5.369 \| good	9.556 \| good	37.439 \| good	0.141 \| good	2.8 \| good	0.123 \| good
2025-08-27T16:00:00.000Z	33 \| good	4.701 \| good	10.012 \| good	36.486 \| good	0.151 \| good	3.473 \| good	0.123 \| good
2025-08-27T17:00:00.000Z	33 \| good	4.911 \| good	8.599 \| good	35.744 \| good	0.15 \| good	4.201 \| good	0.124 \| good
2025-08-27T18:00:00.000Z	32 \| good	4.957 \| good	6.846 \| good	34.9 \| good	0.167 \| good	5.126 \| good	0.124 \| good
2025-08-27T19:00:00.000Z	31 \| good	4.902 \| good	6.56 \| good	33.743 \| good	0.196 \| good	6.028 \| good	0.126 \| good
2025-08-27T20:00:00.000Z	30 \| good	4.765 \| good	6.328 \| good	32.42 \| good	0.2 \| good	5.545 \| good	0.123 \| good
2025-08-27T21:00:00.000Z	29 \| good	4.728 \| good	6.327 \| good	31.31 \| good	0.222 \| good	5.715 \| good	0.123 \| good
2025-08-27T22:00:00.000Z	27 \| good	5.063 \| good	6.46 \| good	28.283 \| good	0.234 \| good	6.071 \| good	0.125 \| good
2025-08-27T23:00:00.000Z	27 \| good	5.31 \| good	6.741 \| good	25.982 \| good	0.226 \| good	6.75 \| good	0.125 \| good
2025-08-28T00:00:00.000Z	33 \| good	5.811 \| good	7.494 \| good	23.911 \| good	0.194 \| good	6.42 \| good	0.125 \| good
2025-08-28T01:00:00.000Z	33 \| good	6.222 \| good	8 \| good	22.442 \| good	0.168 \| good	5.361 \| good	0.124 \| good
2025-08-28T02:00:00.000Z	33 \| good	6.365 \| good	8.491 \| good	22.224 \| good	0.167 \| good	4.677 \| good	0.125 \| good
2025-08-28T03:00:00.000Z	38 \| good	6.707 \| good	9.435 \| good	20.814 \| good	0.183 \| good	3.89 \| good	0.126 \| good
2025-08-28T04:00:00.000Z	33 \| good	6.307 \| good	10.121 \| good	19.632 \| good	0.202 \| good	3.094 \| good	0.126 \| good
2025-08-28T05:00:00.000Z	33 \| good	6.412 \| good	10.265 \| good	19.247 \| good	0.202 \| good	3.244 \| good	0.126 \| good
2025-08-28T06:00:00.000Z	33 \| good	6.468 \| good	12.458 \| good	18.267 \| good	0.231 \| good	5.008 \| good	0.13 \| good
2025-08-28T07:00:00.000Z	33 \| good	5.715 \| good	10.709 \| good	20.367 \| good	0.263 \| good	5.199 \| good	0.131 \| good
2025-08-28T08:00:00.000Z	27 \| good	4.945 \| good	11.562 \| good	24.776 \| good	0.196 \| good	4.37 \| good	0.13 \| good
2025-08-28T09:00:00.000Z	27 \| good	4.683 \| good	10.695 \| good	28.923 \| good	0.2 \| good	3.522 \| good	0.127 \| good
2025-08-28T10:00:00.000Z	30 \| good	4.712 \| good	11.583 \| good	31.68 \| good	0.2 \| good	3.088 \| good	0.126 \| good
2025-08-28T11:00:00.000Z	31 \| good	4.519 \| good	11.235 \| good	34.475 \| good	0.203 \| good	2.749 \| good	0.123 \| good
2025-08-28T12:00:00.000Z	34 \| good	4.251 \| good	9.157 \| good	36.802 \| good	0.222 \| good	2.565 \| good	0.122 \| good
2025-08-28T13:00:00.000Z	33 \| good	3.643 \| good	6.133 \| good	36.454 \| good	0.212 \| good	2.575 \| good	0.121 \| good
2025-08-28T14:00:00.000Z	34 \| good	3.085 \| good	5.464 \| good	36.657 \| good	0.18 \| good	2.409 \| good	0.121 \| good
2025-08-28T15:00:00.000Z	31 \| good	2.933 \| good	4.763 \| good	33.65 \| good	0.15 \| good	2.689 \| good	0.121 \| good
2025-08-28T16:00:00.000Z	30 \| good	3.357 \| good	4.883 \| good	32.127 \| good	0.134 \| good	3.041 \| good	0.123 \| good

Hertfordshire, UK live air quality index now

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?