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

The current PM10 concentration at Hertfordshire, UK is 8.245 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.838 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 25.754 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 8.076 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)

3.22 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

7.94 μg/m³

155

255

425

605+

Ozone (O₃)

26.93 ppb

201

201+

Sulfur Dioxide (SO₂)

0.76 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

10.36 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
2025-07-20T20:00:00.000Z	27 \| good	4.665 \| good	16.341 \| good	27.313 \| good	0.861 \| good	6.103 \| good	0.018 \| good
2025-07-20T21:00:00.000Z	27 \| good	4.809 \| good	12.053 \| good	24.281 \| good	0.795 \| good	14.16 \| good	0.018 \| good
2025-07-20T22:00:00.000Z	27 \| good	4.837 \| good	15.764 \| good	25.608 \| good	0.785 \| good	6.313 \| good	0.014 \| good
2025-07-20T23:00:00.000Z	31 \| good	4.709 \| good	11.421 \| good	33.327 \| good	0.872 \| good	7.083 \| good	0.014 \| good
2025-07-21T00:00:00.000Z	30 \| good	4.039 \| good	9.282 \| good	31.626 \| good	0.808 \| good	6.36 \| good	0.283 \| good
2025-07-21T01:00:00.000Z	25 \| good	3.868 \| good	7.718 \| good	26.587 \| good	0.808 \| good	9.553 \| good	0.269 \| good
2025-07-21T02:00:00.000Z	26 \| good	3.14 \| good	10.516 \| good	28.337 \| good	0.805 \| good	10.67 \| good	0.271 \| good
2025-07-21T03:00:00.000Z	27 \| good	4.948 \| good	10.035 \| good	28.778 \| good	0.7 \| good	8.369 \| good	0.266 \| good
2025-07-21T04:00:00.000Z	23 \| good	2.908 \| good	10.865 \| good	24.932 \| good	0.751 \| good	12.688 \| good	0.273 \| good
2025-07-21T05:00:00.000Z	20 \| good	2.97 \| good	10.497 \| good	21.629 \| good	0.646 \| good	5.046 \| good	0.014 \| good
2025-07-21T06:00:00.000Z	18 \| good	3.331 \| good	9.916 \| good	19.171 \| good	0.736 \| good	4.58 \| good	0.016 \| good
2025-07-21T07:00:00.000Z	16 \| good	2.992 \| good	14.7 \| good	15.014 \| good	0.721 \| good	6.978 \| good	0.015 \| good
2025-07-21T08:00:00.000Z	22 \| good	3.501 \| good	14.54 \| good	14.095 \| good	0.715 \| good	7.393 \| good	0.014 \| good
2025-07-21T09:00:00.000Z	16 \| good	3.237 \| good	14.273 \| good	13.575 \| good	0.824 \| good	5.956 \| good	0.013 \| good
2025-07-21T10:00:00.000Z	22 \| good	3.699 \| good	13.489 \| good	20.107 \| good	0.703 \| good	5.037 \| good	0.012 \| good
2025-07-21T11:00:00.000Z	22 \| good	3.543 \| good	10.18 \| good	18.082 \| good	0.811 \| good	9.019 \| good	0.012 \| good
2025-07-21T12:00:00.000Z	23 \| good	4.36 \| good	11.2 \| good	25.003 \| good	0.731 \| good	13.377 \| good	0.013 \| good
2025-07-21T13:00:00.000Z	22 \| good	3.744 \| good	12.8 \| good	19.852 \| good	0.735 \| good	10.055 \| good	0.014 \| good
2025-07-21T14:00:00.000Z	23 \| good	2.817 \| good	10.736 \| good	25.006 \| good	0.739 \| good	12.349 \| good	0.014 \| good
2025-07-21T15:00:00.000Z	24 \| good	3.567 \| good	9.722 \| good	25.504 \| good	0.817 \| good	10.75 \| good	0.014 \| good
2025-07-21T16:00:00.000Z	25 \| good	3.471 \| good	7.396 \| good	26.908 \| good	0.725 \| good	9.062 \| good	0.014 \| good
2025-07-21T17:00:00.000Z	26 \| good	3.767 \| good	9.25 \| good	28.423 \| good	0.644 \| good	11.191 \| good	0.014 \| good
2025-07-21T18:00:00.000Z	30 \| good	3.803 \| good	10.657 \| good	31.535 \| good	0.733 \| good	7.403 \| good	0.015 \| good
2025-07-21T19:00:00.000Z	32 \| good	4.037 \| good	9.303 \| good	35.499 \| good	0.73 \| good	6.599 \| good	0.015 \| good
2025-07-21T20:00:00.000Z	27 \| good	3.592 \| good	9.612 \| good	28.609 \| good	0.647 \| good	7.766 \| good	0.021 \| good
2025-07-21T21:00:00.000Z	30 \| good	5.04 \| good	10.624 \| good	32.342 \| good	0.714 \| good	6.302 \| good	0.02 \| good
2025-07-21T22:00:00.000Z	27 \| good	4.171 \| good	12.518 \| good	28.784 \| good	0.633 \| good	11.288 \| good	0.012 \| good
2025-07-21T23:00:00.000Z	28 \| good	4.84 \| good	12.145 \| good	29.967 \| good	0.636 \| good	7.473 \| good	0.012 \| good
2025-07-22T00:00:00.000Z	26 \| good	3.442 \| good	14.663 \| good	27.743 \| good	0.781 \| good	8.26 \| good	0.258 \| good
2025-07-22T01:00:00.000Z	27 \| good	5.12 \| good	12.525 \| good	24.651 \| good	0.765 \| good	5.617 \| good	0.239 \| good
2025-07-22T02:00:00.000Z	19 \| good	3.156 \| good	11.203 \| good	19.904 \| good	0.808 \| good	4.763 \| good	0.235 \| good
2025-07-22T03:00:00.000Z	21 \| good	2.924 \| good	12.366 \| good	23.415 \| good	0.889 \| good	4.138 \| good	0.234 \| good
2025-07-22T04:00:00.000Z	22 \| good	3.52 \| good	14.454 \| good	19.905 \| good	0.708 \| good	5.684 \| good	0.237 \| good
2025-07-22T05:00:00.000Z	23 \| good	3.345 \| good	11.546 \| good	24.927 \| good	0.817 \| good	7.634 \| good	0.014 \| good
2025-07-22T06:00:00.000Z	22 \| good	3.774 \| good	12.041 \| good	16.961 \| good	0.735 \| good	8.161 \| good	0.013 \| good
2025-07-22T07:00:00.000Z	19 \| good	3.271 \| good	9.821 \| good	21.482 \| good	0.806 \| good	12.808 \| good	0.013 \| good
2025-07-22T08:00:00.000Z	23 \| good	2.969 \| good	8.568 \| good	24.638 \| good	0.736 \| good	9.65 \| good	0.012 \| good
2025-07-22T09:00:00.000Z	16 \| good	3.231 \| good	8.946 \| good	16.913 \| good	0.695 \| good	8.674 \| good	0.011 \| good
2025-07-22T10:00:00.000Z	17 \| good	2.726 \| good	7.187 \| good	17.86 \| good	0.692 \| good	11.759 \| good	0.011 \| good
2025-07-22T11:00:00.000Z	19 \| good	2.455 \| good	6.723 \| good	19.642 \| good	0.768 \| good	13.569 \| good	0.011 \| good
2025-07-22T12:00:00.000Z	19 \| good	3.44 \| good	8.966 \| good	20.813 \| good	0.781 \| good	9.842 \| good	0.014 \| good
2025-07-22T13:00:00.000Z	22 \| good	4.479 \| good	9.063 \| good	22.002 \| good	0.882 \| good	9.763 \| good	0.014 \| good
2025-07-22T14:00:00.000Z	20 \| good	2.568 \| good	7.383 \| good	21.728 \| good	0.869 \| good	9.829 \| good	0.011 \| good
2025-07-22T15:00:00.000Z	23 \| good	2.52 \| good	12.284 \| good	25.153 \| good	0.77 \| good	11.086 \| good	0.011 \| good
2025-07-22T16:00:00.000Z	26 \| good	4 \| good	10.554 \| good	27.687 \| good	0.687 \| good	14.071 \| good	0.011 \| good
2025-07-22T17:00:00.000Z	27 \| good	5.111 \| good	8.79 \| good	26.425 \| good	0.76 \| good	12.18 \| good	0.012 \| good
2025-07-22T18:00:00.000Z	26 \| good	2.838 \| good	8.08 \| good	27.85 \| good	0.757 \| good	14.541 \| good	0.012 \| good
2025-07-22T19:00:00.000Z	26 \| good	2.561 \| good	8.024 \| good	27.823 \| good	0.677 \| good	13.486 \| good	0.013 \| good
2025-07-22T19:00:00.000Z	25 \| good	3.224 \| good	7.937 \| good	26.927 \| good	0.763 \| good	10.358 \| good	0.011 \| good
2025-07-22T15:00:00.000Z	35 \| good	4.398 \| good	4.86 \| good	38.49 \| good	0.106 \| good	2.279 \| good	0.111 \| good
2025-07-22T16:00:00.000Z	36 \| good	4.167 \| good	4.705 \| good	38.636 \| good	0.107 \| good	2.439 \| good	0.111 \| good
2025-07-22T17:00:00.000Z	36 \| good	3.535 \| good	4.358 \| good	39.429 \| good	0.107 \| good	2.698 \| good	0.108 \| good
2025-07-22T18:00:00.000Z	35 \| good	3.232 \| good	3.995 \| good	38.207 \| good	0.115 \| good	3.12 \| good	0.107 \| good
2025-07-22T19:00:00.000Z	32 \| good	3.098 \| good	4.036 \| good	34.721 \| good	0.149 \| good	3.94 \| good	0.11 \| good
2025-07-22T20:00:00.000Z	30 \| good	3.341 \| good	4.491 \| good	32.128 \| good	0.21 \| good	4.866 \| good	0.113 \| good
2025-07-22T21:00:00.000Z	29 \| good	3.71 \| good	5.036 \| good	30.554 \| good	0.261 \| good	6.12 \| good	0.115 \| good
2025-07-22T22:00:00.000Z	24 \| good	4.101 \| good	5.562 \| good	25.674 \| good	0.263 \| good	6.923 \| good	0.117 \| good
2025-07-22T23:00:00.000Z	27 \| good	4.552 \| good	6.309 \| good	23.093 \| good	0.208 \| good	7.523 \| good	0.117 \| good
2025-07-23T00:00:00.000Z	27 \| good	5.159 \| good	7.169 \| good	22.411 \| good	0.214 \| good	7.791 \| good	0.119 \| good
2025-07-23T01:00:00.000Z	33 \| good	5.931 \| good	9.136 \| good	21.729 \| good	0.201 \| good	7.117 \| good	0.121 \| good
2025-07-23T02:00:00.000Z	38 \| good	7.137 \| good	10.638 \| good	19.21 \| good	0.207 \| good	6.116 \| good	0.12 \| good
2025-07-23T03:00:00.000Z	44 \| good	7.62 \| good	9.986 \| good	18.407 \| good	0.197 \| good	5.416 \| good	0.119 \| good
2025-07-23T04:00:00.000Z	38 \| good	7.302 \| good	9.771 \| good	17.793 \| good	0.205 \| good	5.251 \| good	0.119 \| good
2025-07-23T05:00:00.000Z	38 \| good	6.636 \| good	9.828 \| good	17.202 \| good	0.219 \| good	4.924 \| good	0.119 \| good
2025-07-23T06:00:00.000Z	33 \| good	6.45 \| good	9.235 \| good	18.686 \| good	0.225 \| good	4.893 \| good	0.119 \| good
2025-07-23T07:00:00.000Z	33 \| good	5.552 \| good	8.02 \| good	21.816 \| good	0.24 \| good	5.117 \| good	0.121 \| good
2025-07-23T08:00:00.000Z	27 \| good	5.255 \| good	7.882 \| good	25.015 \| good	0.214 \| good	4.7 \| good	0.118 \| good
2025-07-23T09:00:00.000Z	27 \| good	4.994 \| good	6.618 \| good	27.273 \| good	0.191 \| good	3.505 \| good	0.116 \| good
2025-07-23T10:00:00.000Z	29 \| good	4.372 \| good	6.024 \| good	30.839 \| good	0.156 \| good	2.532 \| good	0.116 \| good
2025-07-23T11:00:00.000Z	32 \| good	3.84 \| good	5.628 \| good	34.874 \| good	0.126 \| good	2.09 \| good	0.116 \| good
2025-07-23T12:00:00.000Z	34 \| good	3.806 \| good	5.613 \| good	36.758 \| good	0.113 \| good	1.818 \| good	0.115 \| good
2025-07-23T13:00:00.000Z	37 \| good	3.608 \| good	5.349 \| good	40.014 \| good	0.106 \| good	1.589 \| good	0.114 \| good
2025-07-23T14:00:00.000Z	38 \| good	3.471 \| good	5.328 \| good	41.227 \| good	0.103 \| good	1.46 \| good	0.113 \| good
2025-07-23T15:00:00.000Z	40 \| good	3.561 \| good	5.273 \| good	42.957 \| good	0.108 \| good	1.591 \| good	0.113 \| good
2025-07-23T16:00:00.000Z	40 \| good	3.786 \| good	5.42 \| good	43.1 \| good	0.113 \| good	1.864 \| good	0.113 \| good
2025-07-23T17:00:00.000Z	40 \| good	3.872 \| good	5.373 \| good	43.04 \| good	0.121 \| good	2.117 \| good	0.112 \| good
2025-07-23T18:00:00.000Z	40 \| good	4.102 \| good	5.78 \| good	42.672 \| good	0.135 \| good	2.57 \| good	0.111 \| good
2025-07-23T19:00:00.000Z	38 \| good	4.957 \| good	6.129 \| good	40.668 \| good	0.168 \| good	3.33 \| good	0.112 \| good
2025-07-23T20:00:00.000Z	34 \| good	5.153 \| good	6.214 \| good	36.946 \| good	0.234 \| good	4.811 \| good	0.114 \| good
2025-07-23T21:00:00.000Z	30 \| good	5.224 \| good	6.692 \| good	31.517 \| good	0.287 \| good	7.437 \| good	0.115 \| good
2025-07-23T22:00:00.000Z	33 \| good	6.4 \| good	7.642 \| good	26.855 \| good	0.299 \| good	8.684 \| good	0.117 \| good
2025-07-23T23:00:00.000Z	38 \| good	7.484 \| good	8.892 \| good	23.683 \| good	0.27 \| good	7.788 \| good	0.117 \| good
2025-07-24T00:00:00.000Z	44 \| good	8.247 \| good	9.836 \| good	21.402 \| good	0.228 \| good	7.202 \| good	0.118 \| good
2025-07-24T01:00:00.000Z	44 \| good	8.32 \| good	9.83 \| good	18.828 \| good	0.197 \| good	6.194 \| good	0.118 \| good
2025-07-24T02:00:00.000Z	44 \| good	8.487 \| good	10.064 \| good	17.887 \| good	0.186 \| good	5.395 \| good	0.118 \| good
2025-07-24T03:00:00.000Z	49 \| good	8.516 \| good	9.968 \| good	17.314 \| good	0.183 \| good	4.979 \| good	0.118 \| good
2025-07-24T04:00:00.000Z	49 \| good	9.075 \| good	10.15 \| good	16.907 \| good	0.184 \| good	4.828 \| good	0.119 \| good
2025-07-24T05:00:00.000Z	52 \| moderate	9.569 \| good	10.228 \| good	16.301 \| good	0.19 \| good	5.448 \| good	0.119 \| good
2025-07-24T06:00:00.000Z	52 \| moderate	9.755 \| good	10.922 \| good	18.39 \| good	0.206 \| good	5.258 \| good	0.122 \| good
2025-07-24T07:00:00.000Z	52 \| moderate	9.772 \| good	11.239 \| good	20.508 \| good	0.233 \| good	5.756 \| good	0.13 \| good
2025-07-24T08:00:00.000Z	33 \| good	6.442 \| good	9.565 \| good	23.902 \| good	0.165 \| good	4.89 \| good	0.126 \| good
2025-07-24T09:00:00.000Z	33 \| good	5.885 \| good	8.218 \| good	29.199 \| good	0.127 \| good	4.005 \| good	0.122 \| good
2025-07-24T10:00:00.000Z	33 \| good	5.181 \| good	7.172 \| good	35.814 \| good	0.113 \| good	2.939 \| good	0.12 \| good
2025-07-24T11:00:00.000Z	36 \| good	4.785 \| good	6.357 \| good	39.476 \| good	0.122 \| good	2.491 \| good	0.12 \| good
2025-07-24T12:00:00.000Z	40 \| good	4.742 \| good	7.293 \| good	42.505 \| good	0.127 \| good	2.068 \| good	0.12 \| good
2025-07-24T13:00:00.000Z	43 \| good	4.648 \| good	7.715 \| good	45.732 \| good	0.128 \| good	1.513 \| good	0.121 \| good
2025-07-24T14:00:00.000Z	44 \| good	4.346 \| good	6.18 \| good	46.826 \| good	0.111 \| good	1.294 \| good	0.122 \| good

Hertfordshire

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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
Baldock, Hertfordshire	27 Good	5.06μg/m³ Good	11.61μg/m³ Good	26.50ppb Good	0.76ppb Good	12.64ppb Good	0.02ppm Good
Hitchin, Hertfordshire	27 Good	5.06μg/m³ Good	11.61μg/m³ Good	26.50ppb Good	0.76ppb Good	12.64ppb Good	0.02ppm Good
Letchworth, Hertfordshire	27 Good	5.06μg/m³ Good	11.61μg/m³ Good	26.50ppb Good	0.76ppb Good	12.64ppb Good	0.02ppm Good
Stevenage, Hertfordshire	27 Good	5.06μg/m³ Good	11.61μg/m³ Good	26.50ppb Good	0.76ppb Good	12.64ppb Good	0.02ppm Good
Welwyn Garden City, Hertfordshire	27 Good	5.11μg/m³ Good	8.79μg/m³ Good	26.43ppb Good	0.76ppb Good	12.18ppb Good	0.01ppm Good
Abbots Langley, Hertfordshire	27 Good	2.57μg/m³ Good	6.39μg/m³ Good	28.69ppb Good	0.74ppb Good	9.46ppb Good	0.01ppm Good
Berkhamsted, Hertfordshire	27 Good	2.41μg/m³ Good	6.36μg/m³ Good	28.67ppb Good	0.74ppb Good	5.41ppb Good	0.01ppm Good
Hemel Hempstead, Hertfordshire	27 Good	2.57μg/m³ Good	6.39μg/m³ Good	28.69ppb Good	0.74ppb Good	9.46ppb Good	0.01ppm Good
Harpenden, Hertfordshire	25 Good	2.69μg/m³ Good	9.49μg/m³ Good	26.95ppb Good	0.76ppb Good	12.35ppb Good	0.01ppm Good
Hatfield, Hertfordshire	25 Good	2.53μg/m³ Good	6.60μg/m³ Good	26.64ppb Good	0.75ppb Good	13.00ppb Good	0.01ppm Good
Rickmansworth, Hertfordshire	25 Good	2.57μg/m³ Good	6.36μg/m³ Good	26.92ppb Good	0.76ppb Good	10.15ppb Good	0.01ppm Good
Cheshunt, Hertfordshire	25 Good	2.56μg/m³ Good	7.94μg/m³ Good	26.64ppb Good	0.93ppb Good	6.27ppb Good	0.01ppm Good
Chorleywood, Hertfordshire	25 Good	2.57μg/m³ Good	6.36μg/m³ Good	26.92ppb Good	0.76ppb Good	10.15ppb Good	0.01ppm Good
Potters Bar, Hertfordshire	25 Good	2.47μg/m³ Good	6.41μg/m³ Good	27.03ppb Good	1.00ppb Good	5.26ppb Good	0.01ppm Good
Waltham Cross, Hertfordshire	25 Good	2.57μg/m³ Good	8.01μg/m³ Good	26.62ppb Good	0.93ppb Good	6.36ppb Good	0.01ppm Good
Tring, Hertfordshire	25 Good	2.42μg/m³ Good	6.40μg/m³ Good	27.00ppb Good	0.75ppb Good	7.64ppb Good	0.02ppm Good
Bushey, Hertfordshire	24 Good	3.02μg/m³ Good	10.23μg/m³ Good	26.25ppb Good	0.46ppb Good	13.65ppb Good	0.00ppm Good
Borehamwood, Hertfordshire	24 Good	2.35μg/m³ Good	5.71μg/m³ Good	26.38ppb Good	0.67ppb Good	4.55ppb Good	0.00ppm Good
Hertford, Hertfordshire	24 Good	2.57μg/m³ Good	7.67μg/m³ Good	26.29ppb Good	0.84ppb Good	10.01ppb Good	0.01ppm Good
Royston, Hertfordshire	24 Good	3.12μg/m³ Good	10.59μg/m³ Good	25.64ppb Good	0.72ppb Good	8.86ppb Good	0.02ppm Good
St Albans, Hertfordshire	24 Good	2.83μg/m³ Good	9.08μg/m³ Good	26.35ppb Good	0.58ppb Good	10.79ppb Good	0.00ppm Good
Hoddesdon, Hertfordshire	24 Good	2.57μg/m³ Good	7.67μg/m³ Good	26.29ppb Good	0.84ppb Good	10.01ppb Good	0.01ppm Good
Ware, Hertfordshire	24 Good	3.12μg/m³ Good	8.90μg/m³ Good	26.39ppb Good	0.78ppb Good	9.45ppb Good	0.01ppm Good
Watford, Hertfordshire	24 Good	2.51μg/m³ Good	6.60μg/m³ Good	26.37ppb Good	0.74ppb Good	9.78ppb Good	0.01ppm Good
Bishop's Stortford, Hertfordshire	23 Good	2.93μg/m³ Good	6.26μg/m³ Good	25.29ppb Good	0.83ppb Good	9.34ppb Good	0.02ppm Good
Sawbridgeworth, Hertfordshire	23 Good	2.93μg/m³ Good	6.26μg/m³ Good	25.29ppb Good	0.83ppb Good	9.34ppb 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

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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 07:00:00 on 2025-07-21.

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 09:00:00 on 2025-07-22.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 24, 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 O3.

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 3.051 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 8.245 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.01 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.838 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 25.754 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 8.076 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-07-20T20:00:00.000Z	27 \| good	4.665 \| good	16.341 \| good	27.313 \| good	0.861 \| good	6.103 \| good	0.018 \| good
2025-07-20T21:00:00.000Z	27 \| good	4.809 \| good	12.053 \| good	24.281 \| good	0.795 \| good	14.16 \| good	0.018 \| good
2025-07-20T22:00:00.000Z	27 \| good	4.837 \| good	15.764 \| good	25.608 \| good	0.785 \| good	6.313 \| good	0.014 \| good
2025-07-20T23:00:00.000Z	31 \| good	4.709 \| good	11.421 \| good	33.327 \| good	0.872 \| good	7.083 \| good	0.014 \| good
2025-07-21T00:00:00.000Z	30 \| good	4.039 \| good	9.282 \| good	31.626 \| good	0.808 \| good	6.36 \| good	0.283 \| good
2025-07-21T01:00:00.000Z	25 \| good	3.868 \| good	7.718 \| good	26.587 \| good	0.808 \| good	9.553 \| good	0.269 \| good
2025-07-21T02:00:00.000Z	26 \| good	3.14 \| good	10.516 \| good	28.337 \| good	0.805 \| good	10.67 \| good	0.271 \| good
2025-07-21T03:00:00.000Z	27 \| good	4.948 \| good	10.035 \| good	28.778 \| good	0.7 \| good	8.369 \| good	0.266 \| good
2025-07-21T04:00:00.000Z	23 \| good	2.908 \| good	10.865 \| good	24.932 \| good	0.751 \| good	12.688 \| good	0.273 \| good
2025-07-21T05:00:00.000Z	20 \| good	2.97 \| good	10.497 \| good	21.629 \| good	0.646 \| good	5.046 \| good	0.014 \| good
2025-07-21T06:00:00.000Z	18 \| good	3.331 \| good	9.916 \| good	19.171 \| good	0.736 \| good	4.58 \| good	0.016 \| good
2025-07-21T07:00:00.000Z	16 \| good	2.992 \| good	14.7 \| good	15.014 \| good	0.721 \| good	6.978 \| good	0.015 \| good
2025-07-21T08:00:00.000Z	22 \| good	3.501 \| good	14.54 \| good	14.095 \| good	0.715 \| good	7.393 \| good	0.014 \| good
2025-07-21T09:00:00.000Z	16 \| good	3.237 \| good	14.273 \| good	13.575 \| good	0.824 \| good	5.956 \| good	0.013 \| good
2025-07-21T10:00:00.000Z	22 \| good	3.699 \| good	13.489 \| good	20.107 \| good	0.703 \| good	5.037 \| good	0.012 \| good
2025-07-21T11:00:00.000Z	22 \| good	3.543 \| good	10.18 \| good	18.082 \| good	0.811 \| good	9.019 \| good	0.012 \| good
2025-07-21T12:00:00.000Z	23 \| good	4.36 \| good	11.2 \| good	25.003 \| good	0.731 \| good	13.377 \| good	0.013 \| good
2025-07-21T13:00:00.000Z	22 \| good	3.744 \| good	12.8 \| good	19.852 \| good	0.735 \| good	10.055 \| good	0.014 \| good
2025-07-21T14:00:00.000Z	23 \| good	2.817 \| good	10.736 \| good	25.006 \| good	0.739 \| good	12.349 \| good	0.014 \| good
2025-07-21T15:00:00.000Z	24 \| good	3.567 \| good	9.722 \| good	25.504 \| good	0.817 \| good	10.75 \| good	0.014 \| good
2025-07-21T16:00:00.000Z	25 \| good	3.471 \| good	7.396 \| good	26.908 \| good	0.725 \| good	9.062 \| good	0.014 \| good
2025-07-21T17:00:00.000Z	26 \| good	3.767 \| good	9.25 \| good	28.423 \| good	0.644 \| good	11.191 \| good	0.014 \| good
2025-07-21T18:00:00.000Z	30 \| good	3.803 \| good	10.657 \| good	31.535 \| good	0.733 \| good	7.403 \| good	0.015 \| good
2025-07-21T19:00:00.000Z	32 \| good	4.037 \| good	9.303 \| good	35.499 \| good	0.73 \| good	6.599 \| good	0.015 \| good
2025-07-21T20:00:00.000Z	27 \| good	3.592 \| good	9.612 \| good	28.609 \| good	0.647 \| good	7.766 \| good	0.021 \| good
2025-07-21T21:00:00.000Z	30 \| good	5.04 \| good	10.624 \| good	32.342 \| good	0.714 \| good	6.302 \| good	0.02 \| good
2025-07-21T22:00:00.000Z	27 \| good	4.171 \| good	12.518 \| good	28.784 \| good	0.633 \| good	11.288 \| good	0.012 \| good
2025-07-21T23:00:00.000Z	28 \| good	4.84 \| good	12.145 \| good	29.967 \| good	0.636 \| good	7.473 \| good	0.012 \| good
2025-07-22T00:00:00.000Z	26 \| good	3.442 \| good	14.663 \| good	27.743 \| good	0.781 \| good	8.26 \| good	0.258 \| good
2025-07-22T01:00:00.000Z	27 \| good	5.12 \| good	12.525 \| good	24.651 \| good	0.765 \| good	5.617 \| good	0.239 \| good
2025-07-22T02:00:00.000Z	19 \| good	3.156 \| good	11.203 \| good	19.904 \| good	0.808 \| good	4.763 \| good	0.235 \| good
2025-07-22T03:00:00.000Z	21 \| good	2.924 \| good	12.366 \| good	23.415 \| good	0.889 \| good	4.138 \| good	0.234 \| good
2025-07-22T04:00:00.000Z	22 \| good	3.52 \| good	14.454 \| good	19.905 \| good	0.708 \| good	5.684 \| good	0.237 \| good
2025-07-22T05:00:00.000Z	23 \| good	3.345 \| good	11.546 \| good	24.927 \| good	0.817 \| good	7.634 \| good	0.014 \| good
2025-07-22T06:00:00.000Z	22 \| good	3.774 \| good	12.041 \| good	16.961 \| good	0.735 \| good	8.161 \| good	0.013 \| good
2025-07-22T07:00:00.000Z	19 \| good	3.271 \| good	9.821 \| good	21.482 \| good	0.806 \| good	12.808 \| good	0.013 \| good
2025-07-22T08:00:00.000Z	23 \| good	2.969 \| good	8.568 \| good	24.638 \| good	0.736 \| good	9.65 \| good	0.012 \| good
2025-07-22T09:00:00.000Z	16 \| good	3.231 \| good	8.946 \| good	16.913 \| good	0.695 \| good	8.674 \| good	0.011 \| good
2025-07-22T10:00:00.000Z	17 \| good	2.726 \| good	7.187 \| good	17.86 \| good	0.692 \| good	11.759 \| good	0.011 \| good
2025-07-22T11:00:00.000Z	19 \| good	2.455 \| good	6.723 \| good	19.642 \| good	0.768 \| good	13.569 \| good	0.011 \| good
2025-07-22T12:00:00.000Z	19 \| good	3.44 \| good	8.966 \| good	20.813 \| good	0.781 \| good	9.842 \| good	0.014 \| good
2025-07-22T13:00:00.000Z	22 \| good	4.479 \| good	9.063 \| good	22.002 \| good	0.882 \| good	9.763 \| good	0.014 \| good
2025-07-22T14:00:00.000Z	20 \| good	2.568 \| good	7.383 \| good	21.728 \| good	0.869 \| good	9.829 \| good	0.011 \| good
2025-07-22T15:00:00.000Z	23 \| good	2.52 \| good	12.284 \| good	25.153 \| good	0.77 \| good	11.086 \| good	0.011 \| good
2025-07-22T16:00:00.000Z	26 \| good	4 \| good	10.554 \| good	27.687 \| good	0.687 \| good	14.071 \| good	0.011 \| good
2025-07-22T17:00:00.000Z	27 \| good	5.111 \| good	8.79 \| good	26.425 \| good	0.76 \| good	12.18 \| good	0.012 \| good
2025-07-22T18:00:00.000Z	26 \| good	2.838 \| good	8.08 \| good	27.85 \| good	0.757 \| good	14.541 \| good	0.012 \| good
2025-07-22T19:00:00.000Z	26 \| good	2.561 \| good	8.024 \| good	27.823 \| good	0.677 \| good	13.486 \| good	0.013 \| good
2025-07-22T19:00:00.000Z	25 \| good	3.224 \| good	7.937 \| good	26.927 \| good	0.763 \| good	10.358 \| good	0.011 \| good
2025-07-22T15:00:00.000Z	35 \| good	4.398 \| good	4.86 \| good	38.49 \| good	0.106 \| good	2.279 \| good	0.111 \| good
2025-07-22T16:00:00.000Z	36 \| good	4.167 \| good	4.705 \| good	38.636 \| good	0.107 \| good	2.439 \| good	0.111 \| good
2025-07-22T17:00:00.000Z	36 \| good	3.535 \| good	4.358 \| good	39.429 \| good	0.107 \| good	2.698 \| good	0.108 \| good
2025-07-22T18:00:00.000Z	35 \| good	3.232 \| good	3.995 \| good	38.207 \| good	0.115 \| good	3.12 \| good	0.107 \| good
2025-07-22T19:00:00.000Z	32 \| good	3.098 \| good	4.036 \| good	34.721 \| good	0.149 \| good	3.94 \| good	0.11 \| good
2025-07-22T20:00:00.000Z	30 \| good	3.341 \| good	4.491 \| good	32.128 \| good	0.21 \| good	4.866 \| good	0.113 \| good
2025-07-22T21:00:00.000Z	29 \| good	3.71 \| good	5.036 \| good	30.554 \| good	0.261 \| good	6.12 \| good	0.115 \| good
2025-07-22T22:00:00.000Z	24 \| good	4.101 \| good	5.562 \| good	25.674 \| good	0.263 \| good	6.923 \| good	0.117 \| good
2025-07-22T23:00:00.000Z	27 \| good	4.552 \| good	6.309 \| good	23.093 \| good	0.208 \| good	7.523 \| good	0.117 \| good
2025-07-23T00:00:00.000Z	27 \| good	5.159 \| good	7.169 \| good	22.411 \| good	0.214 \| good	7.791 \| good	0.119 \| good
2025-07-23T01:00:00.000Z	33 \| good	5.931 \| good	9.136 \| good	21.729 \| good	0.201 \| good	7.117 \| good	0.121 \| good
2025-07-23T02:00:00.000Z	38 \| good	7.137 \| good	10.638 \| good	19.21 \| good	0.207 \| good	6.116 \| good	0.12 \| good
2025-07-23T03:00:00.000Z	44 \| good	7.62 \| good	9.986 \| good	18.407 \| good	0.197 \| good	5.416 \| good	0.119 \| good
2025-07-23T04:00:00.000Z	38 \| good	7.302 \| good	9.771 \| good	17.793 \| good	0.205 \| good	5.251 \| good	0.119 \| good
2025-07-23T05:00:00.000Z	38 \| good	6.636 \| good	9.828 \| good	17.202 \| good	0.219 \| good	4.924 \| good	0.119 \| good
2025-07-23T06:00:00.000Z	33 \| good	6.45 \| good	9.235 \| good	18.686 \| good	0.225 \| good	4.893 \| good	0.119 \| good
2025-07-23T07:00:00.000Z	33 \| good	5.552 \| good	8.02 \| good	21.816 \| good	0.24 \| good	5.117 \| good	0.121 \| good
2025-07-23T08:00:00.000Z	27 \| good	5.255 \| good	7.882 \| good	25.015 \| good	0.214 \| good	4.7 \| good	0.118 \| good
2025-07-23T09:00:00.000Z	27 \| good	4.994 \| good	6.618 \| good	27.273 \| good	0.191 \| good	3.505 \| good	0.116 \| good
2025-07-23T10:00:00.000Z	29 \| good	4.372 \| good	6.024 \| good	30.839 \| good	0.156 \| good	2.532 \| good	0.116 \| good
2025-07-23T11:00:00.000Z	32 \| good	3.84 \| good	5.628 \| good	34.874 \| good	0.126 \| good	2.09 \| good	0.116 \| good
2025-07-23T12:00:00.000Z	34 \| good	3.806 \| good	5.613 \| good	36.758 \| good	0.113 \| good	1.818 \| good	0.115 \| good
2025-07-23T13:00:00.000Z	37 \| good	3.608 \| good	5.349 \| good	40.014 \| good	0.106 \| good	1.589 \| good	0.114 \| good
2025-07-23T14:00:00.000Z	38 \| good	3.471 \| good	5.328 \| good	41.227 \| good	0.103 \| good	1.46 \| good	0.113 \| good
2025-07-23T15:00:00.000Z	40 \| good	3.561 \| good	5.273 \| good	42.957 \| good	0.108 \| good	1.591 \| good	0.113 \| good
2025-07-23T16:00:00.000Z	40 \| good	3.786 \| good	5.42 \| good	43.1 \| good	0.113 \| good	1.864 \| good	0.113 \| good
2025-07-23T17:00:00.000Z	40 \| good	3.872 \| good	5.373 \| good	43.04 \| good	0.121 \| good	2.117 \| good	0.112 \| good
2025-07-23T18:00:00.000Z	40 \| good	4.102 \| good	5.78 \| good	42.672 \| good	0.135 \| good	2.57 \| good	0.111 \| good
2025-07-23T19:00:00.000Z	38 \| good	4.957 \| good	6.129 \| good	40.668 \| good	0.168 \| good	3.33 \| good	0.112 \| good
2025-07-23T20:00:00.000Z	34 \| good	5.153 \| good	6.214 \| good	36.946 \| good	0.234 \| good	4.811 \| good	0.114 \| good
2025-07-23T21:00:00.000Z	30 \| good	5.224 \| good	6.692 \| good	31.517 \| good	0.287 \| good	7.437 \| good	0.115 \| good
2025-07-23T22:00:00.000Z	33 \| good	6.4 \| good	7.642 \| good	26.855 \| good	0.299 \| good	8.684 \| good	0.117 \| good
2025-07-23T23:00:00.000Z	38 \| good	7.484 \| good	8.892 \| good	23.683 \| good	0.27 \| good	7.788 \| good	0.117 \| good
2025-07-24T00:00:00.000Z	44 \| good	8.247 \| good	9.836 \| good	21.402 \| good	0.228 \| good	7.202 \| good	0.118 \| good
2025-07-24T01:00:00.000Z	44 \| good	8.32 \| good	9.83 \| good	18.828 \| good	0.197 \| good	6.194 \| good	0.118 \| good
2025-07-24T02:00:00.000Z	44 \| good	8.487 \| good	10.064 \| good	17.887 \| good	0.186 \| good	5.395 \| good	0.118 \| good
2025-07-24T03:00:00.000Z	49 \| good	8.516 \| good	9.968 \| good	17.314 \| good	0.183 \| good	4.979 \| good	0.118 \| good
2025-07-24T04:00:00.000Z	49 \| good	9.075 \| good	10.15 \| good	16.907 \| good	0.184 \| good	4.828 \| good	0.119 \| good
2025-07-24T05:00:00.000Z	52 \| moderate	9.569 \| good	10.228 \| good	16.301 \| good	0.19 \| good	5.448 \| good	0.119 \| good
2025-07-24T06:00:00.000Z	52 \| moderate	9.755 \| good	10.922 \| good	18.39 \| good	0.206 \| good	5.258 \| good	0.122 \| good
2025-07-24T07:00:00.000Z	52 \| moderate	9.772 \| good	11.239 \| good	20.508 \| good	0.233 \| good	5.756 \| good	0.13 \| good
2025-07-24T08:00:00.000Z	33 \| good	6.442 \| good	9.565 \| good	23.902 \| good	0.165 \| good	4.89 \| good	0.126 \| good
2025-07-24T09:00:00.000Z	33 \| good	5.885 \| good	8.218 \| good	29.199 \| good	0.127 \| good	4.005 \| good	0.122 \| good
2025-07-24T10:00:00.000Z	33 \| good	5.181 \| good	7.172 \| good	35.814 \| good	0.113 \| good	2.939 \| good	0.12 \| good
2025-07-24T11:00:00.000Z	36 \| good	4.785 \| good	6.357 \| good	39.476 \| good	0.122 \| good	2.491 \| good	0.12 \| good
2025-07-24T12:00:00.000Z	40 \| good	4.742 \| good	7.293 \| good	42.505 \| good	0.127 \| good	2.068 \| good	0.12 \| good
2025-07-24T13:00:00.000Z	43 \| good	4.648 \| good	7.715 \| good	45.732 \| good	0.128 \| good	1.513 \| good	0.121 \| good
2025-07-24T14:00:00.000Z	44 \| good	4.346 \| good	6.18 \| good	46.826 \| good	0.111 \| good	1.294 \| good	0.122 \| 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

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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?