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

The current PM10 concentration at Hertfordshire, UK is 16.534 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.621 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 6.88 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 17.401 ppb.

Hertfordshire, UK live air quality index now

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

The current PM2.5 concentration at Hertfordshire, UK is 5.72 μg/m3.

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)

5.72 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

16.53 μg/m³

155

255

425

605+

Ozone (O₃)

6.88 ppb

201

201+

Sulfur Dioxide (SO₂)

0.62 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

17.40 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.64 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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
2026-09-08T08:00:00.000Z	24 \| good	4.055 \| good	11.012 \| good	25.831 \| good	0.698 \| good	8.058 \| good	0.594 \| good
2026-09-08T09:00:00.000Z	27 \| good	4.516 \| good	11.708 \| good	27.841 \| good	0.7 \| good	8.927 \| good	0.665 \| good
2026-09-08T10:00:00.000Z	26 \| good	3.088 \| good	10.311 \| good	28.273 \| good	0.829 \| good	10.539 \| good	0.686 \| good
2026-09-08T11:00:00.000Z	26 \| good	3.313 \| good	11.168 \| good	28.464 \| good	0.867 \| good	10.693 \| good	0.552 \| good
2026-09-08T12:00:00.000Z	22 \| good	3.568 \| good	10.043 \| good	22.589 \| good	0.845 \| good	11.031 \| good	0.487 \| good
2026-09-08T13:00:00.000Z	19 \| good	3.366 \| good	9.78 \| good	20.824 \| good	0.866 \| good	13.826 \| good	0.36 \| good
2026-09-08T14:00:00.000Z	21 \| good	3.338 \| good	9.877 \| good	23.431 \| good	0.865 \| good	18.071 \| good	0.289 \| good
2026-09-08T15:00:00.000Z	22 \| good	3.347 \| good	17.713 \| good	23.598 \| good	0.785 \| good	16.197 \| good	0.341 \| good
2026-09-08T16:00:00.000Z	22 \| good	3.898 \| good	10.544 \| good	23.999 \| good	0.702 \| good	16.462 \| good	0.32 \| good
2026-09-08T17:00:00.000Z	22 \| good	3.845 \| good	12.994 \| good	24.079 \| good	0.699 \| good	11.532 \| good	0.317 \| good
2026-09-08T18:00:00.000Z	23 \| good	3.868 \| good	9.858 \| good	25.453 \| good	0.698 \| good	8.835 \| good	0.334 \| good
2026-09-08T19:00:00.000Z	24 \| good	3.558 \| good	11.11 \| good	26.365 \| good	0.698 \| good	10.689 \| good	0.301 \| good
2026-09-08T20:00:00.000Z	23 \| good	3.671 \| good	11.18 \| good	25.446 \| good	0.699 \| good	8.382 \| good	0.345 \| good
2026-09-08T21:00:00.000Z	26 \| good	4.061 \| good	13.089 \| good	28.16 \| good	0.608 \| good	7.551 \| good	0.386 \| good
2026-09-08T22:00:00.000Z	24 \| good	4.063 \| good	12.436 \| good	25.751 \| good	0.701 \| good	6.821 \| good	0.417 \| good
2026-09-08T23:00:00.000Z	25 \| good	3.576 \| good	11.627 \| good	26.747 \| good	0.612 \| good	5.193 \| good	0.384 \| good
2026-09-09T00:00:00.000Z	24 \| good	3.253 \| good	9.663 \| good	26.055 \| good	0.706 \| good	5.218 \| good	0.351 \| good
2026-09-09T01:00:00.000Z	22 \| good	3.716 \| good	6.948 \| good	19.769 \| good	0.715 \| good	4.859 \| good	0.334 \| good
2026-09-09T02:00:00.000Z	22 \| good	3.587 \| good	7.903 \| good	21.547 \| good	0.715 \| good	4.98 \| good	0.325 \| good
2026-09-09T03:00:00.000Z	22 \| good	3.782 \| good	8.137 \| good	19.568 \| good	0.62 \| good	4.99 \| good	0.291 \| good
2026-09-09T04:00:00.000Z	22 \| good	4.222 \| good	7.935 \| good	19.235 \| good	0.613 \| good	5.103 \| good	0.321 \| good
2026-09-09T05:00:00.000Z	22 \| good	3.73 \| good	8.201 \| good	21.124 \| good	0.612 \| good	4.568 \| good	0.374 \| good
2026-09-09T06:00:00.000Z	22 \| good	4.197 \| good	8.577 \| good	20.811 \| good	0.712 \| good	6.568 \| good	0.442 \| good
2026-09-09T07:00:00.000Z	22 \| good	4 \| good	8.127 \| good	22.093 \| good	0.67 \| good	8.225 \| good	0.509 \| good
2026-09-09T08:00:00.000Z	20 \| good	3.343 \| good	9.3 \| good	21.962 \| good	0.608 \| good	8.598 \| good	0.59 \| good
2026-09-09T09:00:00.000Z	22 \| good	3.63 \| good	10.856 \| good	20.405 \| good	0.611 \| good	8.354 \| good	0.679 \| good
2026-09-09T10:00:00.000Z	17 \| good	3.476 \| good	10.644 \| good	17.848 \| good	0.571 \| good	9.001 \| good	0.735 \| good
2026-09-09T11:00:00.000Z	22 \| good	3.822 \| good	11.811 \| good	17.012 \| good	0.571 \| good	8.413 \| good	0.582 \| good
2026-09-09T12:00:00.000Z	19 \| good	3.312 \| good	12.198 \| good	19.954 \| good	0.57 \| good	8.616 \| good	0.513 \| good
2026-09-09T13:00:00.000Z	19 \| good	3.36 \| good	12.353 \| good	20.007 \| good	0.571 \| good	8.624 \| good	0.415 \| good
2026-09-09T14:00:00.000Z	22 \| good	3.27 \| good	10.919 \| good	24.21 \| good	0.736 \| good	8.342 \| good	0.416 \| good
2026-09-09T15:00:00.000Z	19 \| good	3.062 \| good	8.021 \| good	20.307 \| good	0.654 \| good	6.459 \| good	0.424 \| good
2026-09-09T16:00:00.000Z	21 \| good	2.886 \| good	8.199 \| good	23.497 \| good	0.697 \| good	6.913 \| good	0.386 \| good
2026-09-09T17:00:00.000Z	25 \| good	3.345 \| good	10.55 \| good	27.196 \| good	0.698 \| good	7.918 \| good	0.374 \| good
2026-09-09T18:00:00.000Z	24 \| good	3.062 \| good	7.897 \| good	25.536 \| good	1.132 \| good	11.852 \| good	0.367 \| good
2026-09-09T19:00:00.000Z	29 \| good	3.387 \| good	7.86 \| good	31.07 \| good	0.724 \| good	12.428 \| good	0.367 \| good
2026-09-09T20:00:00.000Z	27 \| good	3.484 \| good	7.771 \| good	28.68 \| good	0.618 \| good	11.888 \| good	0.393 \| good
2026-09-09T21:00:00.000Z	26 \| good	3.059 \| good	8.728 \| good	27.62 \| good	0.627 \| good	11.422 \| good	0.403 \| good
2026-09-09T22:00:00.000Z	23 \| good	3.165 \| good	9.529 \| good	25.009 \| good	0.686 \| good	16.809 \| good	0.409 \| good
2026-09-09T23:00:00.000Z	21 \| good	2.873 \| good	6.344 \| good	22.986 \| good	0.818 \| good	17.837 \| good	0.417 \| good
2026-09-10T00:00:00.000Z	27 \| good	5.421 \| good	7.6 \| good	20.053 \| good	0.951 \| good	10.675 \| good	0.441 \| good
2026-09-10T01:00:00.000Z	44 \| good	8.498 \| good	12.382 \| good	19.331 \| good	0.684 \| good	16.496 \| good	0.51 \| good
2026-09-10T02:00:00.000Z	49 \| good	8.92 \| good	11.841 \| good	14.483 \| good	0.622 \| good	11.19 \| good	0.41 \| good
2026-09-10T03:00:00.000Z	27 \| good	5.179 \| good	16.457 \| good	10.604 \| good	0.572 \| good	10.69 \| good	0.44 \| good
2026-09-10T04:00:00.000Z	33 \| good	5.951 \| good	17.356 \| good	8.998 \| good	0.59 \| good	17.615 \| good	0.499 \| good
2026-09-10T05:00:00.000Z	33 \| good	5.582 \| good	17.079 \| good	8.72 \| good	0.594 \| good	17.427 \| good	0.624 \| good
2026-09-10T06:00:00.000Z	33 \| good	6.179 \| good	17.902 \| good	6.141 \| good	0.612 \| good	18.852 \| good	0.638 \| good
2026-09-10T07:00:00.000Z	33 \| good	5.767 \| good	12.33 \| good	8.043 \| good	0.612 \| good	16.747 \| good	0.763 \| good
2026-09-10T07:00:00.000Z	33 \| good	5.72 \| good	16.534 \| good	6.88 \| good	0.621 \| good	17.401 \| good	0.638 \| good
2026-09-10T08:00:00.000Z	52 \| moderate	10.329 \| good	16.345 \| good	11.532 \| good	0.429 \| good	10.736 \| good	0.167 \| good
2026-09-10T09:00:00.000Z	44 \| good	7.8 \| good	12.951 \| good	19.723 \| good	0.409 \| good	7.712 \| good	0.16 \| good
2026-09-10T10:00:00.000Z	28 \| good	5.306 \| good	10.232 \| good	29.693 \| good	0.302 \| good	5.291 \| good	0.151 \| good
2026-09-10T11:00:00.000Z	31 \| good	4.402 \| good	9.204 \| good	32.52 \| good	0.258 \| good	4.178 \| good	0.146 \| good
2026-09-10T12:00:00.000Z	32 \| good	4.279 \| good	7.167 \| good	35.302 \| good	0.222 \| good	3.035 \| good	0.141 \| good
2026-09-10T13:00:00.000Z	35 \| good	3.762 \| good	7.294 \| good	38.209 \| good	0.163 \| good	2.346 \| good	0.138 \| good
2026-09-10T14:00:00.000Z	36 \| good	3.625 \| good	7.207 \| good	38.975 \| good	0.127 \| good	2.313 \| good	0.135 \| good
2026-09-10T15:00:00.000Z	35 \| good	3.846 \| good	7.391 \| good	38.338 \| good	0.153 \| good	2.843 \| good	0.134 \| good
2026-09-10T16:00:00.000Z	33 \| good	4.278 \| good	8.285 \| good	36.291 \| good	0.135 \| good	3.031 \| good	0.132 \| good
2026-09-10T17:00:00.000Z	31 \| good	4.412 \| good	8.678 \| good	33.162 \| good	0.161 \| good	4.548 \| good	0.134 \| good
2026-09-10T18:00:00.000Z	30 \| good	4.609 \| good	9.514 \| good	31.985 \| good	0.207 \| good	5.978 \| good	0.137 \| good
2026-09-10T19:00:00.000Z	28 \| good	4.902 \| good	9.792 \| good	30.444 \| good	0.243 \| good	6.692 \| good	0.138 \| good
2026-09-10T20:00:00.000Z	28 \| good	4.845 \| good	9.527 \| good	29.856 \| good	0.289 \| good	6.59 \| good	0.139 \| good
2026-09-10T21:00:00.000Z	29 \| good	5.148 \| good	9.299 \| good	30.96 \| good	0.27 \| good	5.854 \| good	0.14 \| good
2026-09-10T22:00:00.000Z	30 \| good	5.079 \| good	8.512 \| good	32.438 \| good	0.246 \| good	5.3 \| good	0.138 \| good
2026-09-10T23:00:00.000Z	30 \| good	5.179 \| good	8.316 \| good	32.42 \| good	0.216 \| good	4.913 \| good	0.135 \| good
2026-09-11T00:00:00.000Z	29 \| good	5.067 \| good	8.929 \| good	31.402 \| good	0.199 \| good	4.287 \| good	0.131 \| good
2026-09-11T01:00:00.000Z	29 \| good	4.743 \| good	9.053 \| good	30.949 \| good	0.21 \| good	3.586 \| good	0.13 \| good
2026-09-11T02:00:00.000Z	29 \| good	4.291 \| good	7.585 \| good	30.83 \| good	0.164 \| good	3.026 \| good	0.127 \| good
2026-09-11T03:00:00.000Z	28 \| good	3.927 \| good	6.801 \| good	29.524 \| good	0.126 \| good	2.582 \| good	0.125 \| good
2026-09-11T04:00:00.000Z	26 \| good	4.046 \| good	6.514 \| good	28.289 \| good	0.105 \| good	2.266 \| good	0.123 \| good
2026-09-11T05:00:00.000Z	24 \| good	4.095 \| good	6.641 \| good	25.605 \| good	0.11 \| good	2.501 \| good	0.125 \| good
2026-09-11T06:00:00.000Z	22 \| good	4.305 \| good	6.669 \| good	23.133 \| good	0.151 \| good	3.611 \| good	0.128 \| good
2026-09-11T07:00:00.000Z	22 \| good	4.297 \| good	7.071 \| good	22.053 \| good	0.182 \| good	4.827 \| good	0.133 \| good
2026-09-11T08:00:00.000Z	22 \| good	3.894 \| good	6.567 \| good	22.537 \| good	0.177 \| good	4.497 \| good	0.131 \| good
2026-09-11T09:00:00.000Z	22 \| good	3.086 \| good	6.114 \| good	23.993 \| good	0.146 \| good	3.567 \| good	0.128 \| good
2026-09-11T10:00:00.000Z	23 \| good	2.899 \| good	6.037 \| good	24.623 \| good	0.129 \| good	2.413 \| good	0.126 \| good
2026-09-11T11:00:00.000Z	25 \| good	2.729 \| good	5.992 \| good	27.453 \| good	0.117 \| good	2.162 \| good	0.125 \| good
2026-09-11T12:00:00.000Z	28 \| good	2.653 \| good	6.094 \| good	30.215 \| good	0.108 \| good	1.987 \| good	0.125 \| good
2026-09-11T13:00:00.000Z	31 \| good	2.902 \| good	6.1 \| good	33.156 \| good	0.12 \| good	1.838 \| good	0.125 \| good
2026-09-11T14:00:00.000Z	33 \| good	2.99 \| good	5.924 \| good	35.725 \| good	0.113 \| good	1.737 \| good	0.126 \| good
2026-09-11T15:00:00.000Z	34 \| good	3.019 \| good	5.708 \| good	37.289 \| good	0.107 \| good	1.901 \| good	0.127 \| good
2026-09-11T16:00:00.000Z	35 \| good	3.271 \| good	6.057 \| good	37.734 \| good	0.105 \| good	2.363 \| good	0.129 \| good
2026-09-11T17:00:00.000Z	33 \| good	3.752 \| good	6.412 \| good	36.449 \| good	0.156 \| good	3.032 \| good	0.132 \| good
2026-09-11T18:00:00.000Z	29 \| good	3.93 \| good	6.936 \| good	30.723 \| good	0.256 \| good	5.343 \| good	0.138 \| good
2026-09-11T19:00:00.000Z	24 \| good	4.386 \| good	8.111 \| good	26.279 \| good	0.323 \| good	8.184 \| good	0.144 \| good
2026-09-11T20:00:00.000Z	27 \| good	5.185 \| good	9.094 \| good	20.928 \| good	0.376 \| good	11.9 \| good	0.153 \| good
2026-09-11T21:00:00.000Z	33 \| good	5.681 \| good	9.74 \| good	18.757 \| good	0.383 \| good	12.677 \| good	0.155 \| good
2026-09-11T22:00:00.000Z	33 \| good	5.716 \| good	9.758 \| good	17.701 \| good	0.364 \| good	11.38 \| good	0.153 \| good
2026-09-11T23:00:00.000Z	33 \| good	6.14 \| good	10.035 \| good	16.721 \| good	0.342 \| good	10.585 \| good	0.152 \| good
2026-09-12T00:00:00.000Z	38 \| good	6.501 \| good	10.703 \| good	17.024 \| good	0.309 \| good	10.668 \| good	0.148 \| good
2026-09-12T01:00:00.000Z	38 \| good	7.061 \| good	10.393 \| good	15.878 \| good	0.272 \| good	9.431 \| good	0.148 \| good
2026-09-12T02:00:00.000Z	44 \| good	8.222 \| good	10.653 \| good	13.826 \| good	0.254 \| good	8.437 \| good	0.147 \| good
2026-09-12T03:00:00.000Z	49 \| good	9.347 \| good	11.762 \| good	11.887 \| good	0.239 \| good	8.158 \| good	0.149 \| good
2026-09-12T04:00:00.000Z	52 \| moderate	9.833 \| good	12.793 \| good	10.839 \| good	0.233 \| good	8.108 \| good	0.15 \| good
2026-09-12T05:00:00.000Z	52 \| moderate	9.715 \| good	13.547 \| good	11.258 \| good	0.252 \| good	8.275 \| good	0.151 \| good
2026-09-12T06:00:00.000Z	52 \| moderate	10.475 \| good	14.052 \| good	13.215 \| good	0.275 \| good	7.746 \| good	0.158 \| good
2026-09-12T07:00:00.000Z	52 \| moderate	10.21 \| good	13.847 \| good	15.542 \| good	0.361 \| good	6.358 \| good	0.164 \| 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	5.11μg/m³ Good	21.79μg/m³ Good	7.26ppb Good	0.60ppb Good	17.00ppb Good	0.64ppm Good
Cheshunt, Hertfordshire	33 Good	5.95μg/m³ Good	19.82μg/m³ Good	6.66ppb Good	0.62ppb Good	19.41ppb Good	0.64ppm Good
Hemel Hempstead, Hertfordshire	27 Good	4.75μg/m³ Good	18.56μg/m³ Good	6.32ppb Good	0.62ppb Good	15.75ppb Good	0.64ppm Good
Rickmansworth, Hertfordshire	49 Good	9.02μg/m³ Good	11.41μg/m³ Good	6.07ppb Good	0.63ppb Good	17.30ppb Good	0.64ppm Good
Harpenden, Hertfordshire	33 Good	6.11μg/m³ Good	9.96μg/m³ Good	6.00ppb Good	0.61ppb Good	16.88ppb Good	0.64ppm Good
Bishop's Stortford, Hertfordshire	27 Good	4.59μg/m³ Good	22.18μg/m³ Good	7.54ppb Good	0.61ppb Good	22.03ppb Good	0.64ppm Good
Berkhamsted, Hertfordshire	16 Good	1.40μg/m³ Good	7.17μg/m³ Good	6.14ppb Good	0.62ppb Good	17.40ppb Good	0.64ppm Good
Hatfield, Hertfordshire	27 Good	5.38μg/m³ Good	9.99μg/m³ Good	6.87ppb Good	0.62ppb Good	16.54ppb Good	0.64ppm Good
Borehamwood, Hertfordshire	27 Good	5.12μg/m³ Good	11.09μg/m³ Good	7.58ppb Good	0.66ppb Good	20.92ppb Good	0.64ppm Good
Bushey, Hertfordshire	44 Good	7.98μg/m³ Good	22.09μg/m³ Good	7.08ppb Good	0.72ppb Good	23.98ppb Good	0.64ppm Good
Chorleywood, Hertfordshire	49 Good	9.02μg/m³ Good	11.41μg/m³ Good	6.07ppb Good	0.63ppb Good	17.30ppb Good	0.64ppm Good
Abbots Langley, Hertfordshire	27 Good	4.75μg/m³ Good	18.56μg/m³ Good	6.32ppb Good	0.62ppb Good	15.75ppb Good	0.64ppm Good
Hertford, Hertfordshire	33 Good	6.35μg/m³ Good	16.18μg/m³ Good	6.38ppb Good	0.63ppb Good	14.14ppb Good	0.64ppm Good
Stevenage, Hertfordshire	27 Good	5.11μg/m³ Good	21.79μg/m³ Good	7.26ppb Good	0.60ppb Good	17.00ppb Good	0.64ppm Good
St Albans, Hertfordshire	38 Good	6.57μg/m³ Good	17.17μg/m³ Good	7.13ppb Good	0.68ppb Good	23.09ppb Good	0.64ppm Good
Hoddesdon, Hertfordshire	33 Good	6.35μg/m³ Good	16.18μg/m³ Good	6.38ppb Good	0.63ppb Good	14.14ppb Good	0.64ppm Good
Royston, Hertfordshire	27 Good	5.15μg/m³ Good	9.70μg/m³ Good	8.43ppb Good	0.57ppb Good	8.38ppb Good	0.64ppm Good
Letchworth, Hertfordshire	27 Good	5.11μg/m³ Good	21.79μg/m³ Good	7.26ppb Good	0.60ppb Good	17.00ppb Good	0.64ppm Good
Hitchin, Hertfordshire	27 Good	5.11μg/m³ Good	21.79μg/m³ Good	7.26ppb Good	0.60ppb Good	17.00ppb Good	0.64ppm Good
Sawbridgeworth, Hertfordshire	27 Good	4.59μg/m³ Good	22.18μg/m³ Good	7.54ppb Good	0.61ppb Good	22.03ppb Good	0.64ppm Good
Potters Bar, Hertfordshire	33 Good	5.51μg/m³ Good	13.24μg/m³ Good	6.71ppb Good	0.62ppb Good	19.68ppb Good	0.64ppm Good
Waltham Cross, Hertfordshire	33 Good	5.95μg/m³ Good	20.09μg/m³ Good	6.68ppb Good	0.62ppb Good	19.48ppb Good	0.64ppm Good
Tring, Hertfordshire	33 Good	6.42μg/m³ Good	12.06μg/m³ Good	7.37ppb Good	0.55ppb Good	9.65ppb Good	0.64ppm Good
Watford, Hertfordshire	33 Good	5.94μg/m³ Good	18.11μg/m³ Good	7.75ppb Good	0.63ppb Good	16.51ppb Good	0.64ppm Good
Welwyn Garden City, Hertfordshire	33 Good	6.18μg/m³ Good	17.90μg/m³ Good	6.14ppb Good	0.61ppb Good	18.85ppb Good	0.64ppm Good
Ware, Hertfordshire	27 Good	5.23μg/m³ Good	17.71μg/m³ Good	6.66ppb Good	0.61ppb Good	15.23ppb Good	0.64ppm Good

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

0.64ppm

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 02:00:00 on 2026-09-10.

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 10:00:00 on 2026-09-09.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 33, 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 5.72 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 16.534 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.638 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.621 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 6.88 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 17.401 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-08T08:00:00.000Z	24 \| good	4.055 \| good	11.012 \| good	25.831 \| good	0.698 \| good	8.058 \| good	0.594 \| good
2026-09-08T09:00:00.000Z	27 \| good	4.516 \| good	11.708 \| good	27.841 \| good	0.7 \| good	8.927 \| good	0.665 \| good
2026-09-08T10:00:00.000Z	26 \| good	3.088 \| good	10.311 \| good	28.273 \| good	0.829 \| good	10.539 \| good	0.686 \| good
2026-09-08T11:00:00.000Z	26 \| good	3.313 \| good	11.168 \| good	28.464 \| good	0.867 \| good	10.693 \| good	0.552 \| good
2026-09-08T12:00:00.000Z	22 \| good	3.568 \| good	10.043 \| good	22.589 \| good	0.845 \| good	11.031 \| good	0.487 \| good
2026-09-08T13:00:00.000Z	19 \| good	3.366 \| good	9.78 \| good	20.824 \| good	0.866 \| good	13.826 \| good	0.36 \| good
2026-09-08T14:00:00.000Z	21 \| good	3.338 \| good	9.877 \| good	23.431 \| good	0.865 \| good	18.071 \| good	0.289 \| good
2026-09-08T15:00:00.000Z	22 \| good	3.347 \| good	17.713 \| good	23.598 \| good	0.785 \| good	16.197 \| good	0.341 \| good
2026-09-08T16:00:00.000Z	22 \| good	3.898 \| good	10.544 \| good	23.999 \| good	0.702 \| good	16.462 \| good	0.32 \| good
2026-09-08T17:00:00.000Z	22 \| good	3.845 \| good	12.994 \| good	24.079 \| good	0.699 \| good	11.532 \| good	0.317 \| good
2026-09-08T18:00:00.000Z	23 \| good	3.868 \| good	9.858 \| good	25.453 \| good	0.698 \| good	8.835 \| good	0.334 \| good
2026-09-08T19:00:00.000Z	24 \| good	3.558 \| good	11.11 \| good	26.365 \| good	0.698 \| good	10.689 \| good	0.301 \| good
2026-09-08T20:00:00.000Z	23 \| good	3.671 \| good	11.18 \| good	25.446 \| good	0.699 \| good	8.382 \| good	0.345 \| good
2026-09-08T21:00:00.000Z	26 \| good	4.061 \| good	13.089 \| good	28.16 \| good	0.608 \| good	7.551 \| good	0.386 \| good
2026-09-08T22:00:00.000Z	24 \| good	4.063 \| good	12.436 \| good	25.751 \| good	0.701 \| good	6.821 \| good	0.417 \| good
2026-09-08T23:00:00.000Z	25 \| good	3.576 \| good	11.627 \| good	26.747 \| good	0.612 \| good	5.193 \| good	0.384 \| good
2026-09-09T00:00:00.000Z	24 \| good	3.253 \| good	9.663 \| good	26.055 \| good	0.706 \| good	5.218 \| good	0.351 \| good
2026-09-09T01:00:00.000Z	22 \| good	3.716 \| good	6.948 \| good	19.769 \| good	0.715 \| good	4.859 \| good	0.334 \| good
2026-09-09T02:00:00.000Z	22 \| good	3.587 \| good	7.903 \| good	21.547 \| good	0.715 \| good	4.98 \| good	0.325 \| good
2026-09-09T03:00:00.000Z	22 \| good	3.782 \| good	8.137 \| good	19.568 \| good	0.62 \| good	4.99 \| good	0.291 \| good
2026-09-09T04:00:00.000Z	22 \| good	4.222 \| good	7.935 \| good	19.235 \| good	0.613 \| good	5.103 \| good	0.321 \| good
2026-09-09T05:00:00.000Z	22 \| good	3.73 \| good	8.201 \| good	21.124 \| good	0.612 \| good	4.568 \| good	0.374 \| good
2026-09-09T06:00:00.000Z	22 \| good	4.197 \| good	8.577 \| good	20.811 \| good	0.712 \| good	6.568 \| good	0.442 \| good
2026-09-09T07:00:00.000Z	22 \| good	4 \| good	8.127 \| good	22.093 \| good	0.67 \| good	8.225 \| good	0.509 \| good
2026-09-09T08:00:00.000Z	20 \| good	3.343 \| good	9.3 \| good	21.962 \| good	0.608 \| good	8.598 \| good	0.59 \| good
2026-09-09T09:00:00.000Z	22 \| good	3.63 \| good	10.856 \| good	20.405 \| good	0.611 \| good	8.354 \| good	0.679 \| good
2026-09-09T10:00:00.000Z	17 \| good	3.476 \| good	10.644 \| good	17.848 \| good	0.571 \| good	9.001 \| good	0.735 \| good
2026-09-09T11:00:00.000Z	22 \| good	3.822 \| good	11.811 \| good	17.012 \| good	0.571 \| good	8.413 \| good	0.582 \| good
2026-09-09T12:00:00.000Z	19 \| good	3.312 \| good	12.198 \| good	19.954 \| good	0.57 \| good	8.616 \| good	0.513 \| good
2026-09-09T13:00:00.000Z	19 \| good	3.36 \| good	12.353 \| good	20.007 \| good	0.571 \| good	8.624 \| good	0.415 \| good
2026-09-09T14:00:00.000Z	22 \| good	3.27 \| good	10.919 \| good	24.21 \| good	0.736 \| good	8.342 \| good	0.416 \| good
2026-09-09T15:00:00.000Z	19 \| good	3.062 \| good	8.021 \| good	20.307 \| good	0.654 \| good	6.459 \| good	0.424 \| good
2026-09-09T16:00:00.000Z	21 \| good	2.886 \| good	8.199 \| good	23.497 \| good	0.697 \| good	6.913 \| good	0.386 \| good
2026-09-09T17:00:00.000Z	25 \| good	3.345 \| good	10.55 \| good	27.196 \| good	0.698 \| good	7.918 \| good	0.374 \| good
2026-09-09T18:00:00.000Z	24 \| good	3.062 \| good	7.897 \| good	25.536 \| good	1.132 \| good	11.852 \| good	0.367 \| good
2026-09-09T19:00:00.000Z	29 \| good	3.387 \| good	7.86 \| good	31.07 \| good	0.724 \| good	12.428 \| good	0.367 \| good
2026-09-09T20:00:00.000Z	27 \| good	3.484 \| good	7.771 \| good	28.68 \| good	0.618 \| good	11.888 \| good	0.393 \| good
2026-09-09T21:00:00.000Z	26 \| good	3.059 \| good	8.728 \| good	27.62 \| good	0.627 \| good	11.422 \| good	0.403 \| good
2026-09-09T22:00:00.000Z	23 \| good	3.165 \| good	9.529 \| good	25.009 \| good	0.686 \| good	16.809 \| good	0.409 \| good
2026-09-09T23:00:00.000Z	21 \| good	2.873 \| good	6.344 \| good	22.986 \| good	0.818 \| good	17.837 \| good	0.417 \| good
2026-09-10T00:00:00.000Z	27 \| good	5.421 \| good	7.6 \| good	20.053 \| good	0.951 \| good	10.675 \| good	0.441 \| good
2026-09-10T01:00:00.000Z	44 \| good	8.498 \| good	12.382 \| good	19.331 \| good	0.684 \| good	16.496 \| good	0.51 \| good
2026-09-10T02:00:00.000Z	49 \| good	8.92 \| good	11.841 \| good	14.483 \| good	0.622 \| good	11.19 \| good	0.41 \| good
2026-09-10T03:00:00.000Z	27 \| good	5.179 \| good	16.457 \| good	10.604 \| good	0.572 \| good	10.69 \| good	0.44 \| good
2026-09-10T04:00:00.000Z	33 \| good	5.951 \| good	17.356 \| good	8.998 \| good	0.59 \| good	17.615 \| good	0.499 \| good
2026-09-10T05:00:00.000Z	33 \| good	5.582 \| good	17.079 \| good	8.72 \| good	0.594 \| good	17.427 \| good	0.624 \| good
2026-09-10T06:00:00.000Z	33 \| good	6.179 \| good	17.902 \| good	6.141 \| good	0.612 \| good	18.852 \| good	0.638 \| good
2026-09-10T07:00:00.000Z	33 \| good	5.767 \| good	12.33 \| good	8.043 \| good	0.612 \| good	16.747 \| good	0.763 \| good
2026-09-10T07:00:00.000Z	33 \| good	5.72 \| good	16.534 \| good	6.88 \| good	0.621 \| good	17.401 \| good	0.638 \| good
2026-09-10T08:00:00.000Z	52 \| moderate	10.329 \| good	16.345 \| good	11.532 \| good	0.429 \| good	10.736 \| good	0.167 \| good
2026-09-10T09:00:00.000Z	44 \| good	7.8 \| good	12.951 \| good	19.723 \| good	0.409 \| good	7.712 \| good	0.16 \| good
2026-09-10T10:00:00.000Z	28 \| good	5.306 \| good	10.232 \| good	29.693 \| good	0.302 \| good	5.291 \| good	0.151 \| good
2026-09-10T11:00:00.000Z	31 \| good	4.402 \| good	9.204 \| good	32.52 \| good	0.258 \| good	4.178 \| good	0.146 \| good
2026-09-10T12:00:00.000Z	32 \| good	4.279 \| good	7.167 \| good	35.302 \| good	0.222 \| good	3.035 \| good	0.141 \| good
2026-09-10T13:00:00.000Z	35 \| good	3.762 \| good	7.294 \| good	38.209 \| good	0.163 \| good	2.346 \| good	0.138 \| good
2026-09-10T14:00:00.000Z	36 \| good	3.625 \| good	7.207 \| good	38.975 \| good	0.127 \| good	2.313 \| good	0.135 \| good
2026-09-10T15:00:00.000Z	35 \| good	3.846 \| good	7.391 \| good	38.338 \| good	0.153 \| good	2.843 \| good	0.134 \| good
2026-09-10T16:00:00.000Z	33 \| good	4.278 \| good	8.285 \| good	36.291 \| good	0.135 \| good	3.031 \| good	0.132 \| good
2026-09-10T17:00:00.000Z	31 \| good	4.412 \| good	8.678 \| good	33.162 \| good	0.161 \| good	4.548 \| good	0.134 \| good
2026-09-10T18:00:00.000Z	30 \| good	4.609 \| good	9.514 \| good	31.985 \| good	0.207 \| good	5.978 \| good	0.137 \| good
2026-09-10T19:00:00.000Z	28 \| good	4.902 \| good	9.792 \| good	30.444 \| good	0.243 \| good	6.692 \| good	0.138 \| good
2026-09-10T20:00:00.000Z	28 \| good	4.845 \| good	9.527 \| good	29.856 \| good	0.289 \| good	6.59 \| good	0.139 \| good
2026-09-10T21:00:00.000Z	29 \| good	5.148 \| good	9.299 \| good	30.96 \| good	0.27 \| good	5.854 \| good	0.14 \| good
2026-09-10T22:00:00.000Z	30 \| good	5.079 \| good	8.512 \| good	32.438 \| good	0.246 \| good	5.3 \| good	0.138 \| good
2026-09-10T23:00:00.000Z	30 \| good	5.179 \| good	8.316 \| good	32.42 \| good	0.216 \| good	4.913 \| good	0.135 \| good
2026-09-11T00:00:00.000Z	29 \| good	5.067 \| good	8.929 \| good	31.402 \| good	0.199 \| good	4.287 \| good	0.131 \| good
2026-09-11T01:00:00.000Z	29 \| good	4.743 \| good	9.053 \| good	30.949 \| good	0.21 \| good	3.586 \| good	0.13 \| good
2026-09-11T02:00:00.000Z	29 \| good	4.291 \| good	7.585 \| good	30.83 \| good	0.164 \| good	3.026 \| good	0.127 \| good
2026-09-11T03:00:00.000Z	28 \| good	3.927 \| good	6.801 \| good	29.524 \| good	0.126 \| good	2.582 \| good	0.125 \| good
2026-09-11T04:00:00.000Z	26 \| good	4.046 \| good	6.514 \| good	28.289 \| good	0.105 \| good	2.266 \| good	0.123 \| good
2026-09-11T05:00:00.000Z	24 \| good	4.095 \| good	6.641 \| good	25.605 \| good	0.11 \| good	2.501 \| good	0.125 \| good
2026-09-11T06:00:00.000Z	22 \| good	4.305 \| good	6.669 \| good	23.133 \| good	0.151 \| good	3.611 \| good	0.128 \| good
2026-09-11T07:00:00.000Z	22 \| good	4.297 \| good	7.071 \| good	22.053 \| good	0.182 \| good	4.827 \| good	0.133 \| good
2026-09-11T08:00:00.000Z	22 \| good	3.894 \| good	6.567 \| good	22.537 \| good	0.177 \| good	4.497 \| good	0.131 \| good
2026-09-11T09:00:00.000Z	22 \| good	3.086 \| good	6.114 \| good	23.993 \| good	0.146 \| good	3.567 \| good	0.128 \| good
2026-09-11T10:00:00.000Z	23 \| good	2.899 \| good	6.037 \| good	24.623 \| good	0.129 \| good	2.413 \| good	0.126 \| good
2026-09-11T11:00:00.000Z	25 \| good	2.729 \| good	5.992 \| good	27.453 \| good	0.117 \| good	2.162 \| good	0.125 \| good
2026-09-11T12:00:00.000Z	28 \| good	2.653 \| good	6.094 \| good	30.215 \| good	0.108 \| good	1.987 \| good	0.125 \| good
2026-09-11T13:00:00.000Z	31 \| good	2.902 \| good	6.1 \| good	33.156 \| good	0.12 \| good	1.838 \| good	0.125 \| good
2026-09-11T14:00:00.000Z	33 \| good	2.99 \| good	5.924 \| good	35.725 \| good	0.113 \| good	1.737 \| good	0.126 \| good
2026-09-11T15:00:00.000Z	34 \| good	3.019 \| good	5.708 \| good	37.289 \| good	0.107 \| good	1.901 \| good	0.127 \| good
2026-09-11T16:00:00.000Z	35 \| good	3.271 \| good	6.057 \| good	37.734 \| good	0.105 \| good	2.363 \| good	0.129 \| good
2026-09-11T17:00:00.000Z	33 \| good	3.752 \| good	6.412 \| good	36.449 \| good	0.156 \| good	3.032 \| good	0.132 \| good
2026-09-11T18:00:00.000Z	29 \| good	3.93 \| good	6.936 \| good	30.723 \| good	0.256 \| good	5.343 \| good	0.138 \| good
2026-09-11T19:00:00.000Z	24 \| good	4.386 \| good	8.111 \| good	26.279 \| good	0.323 \| good	8.184 \| good	0.144 \| good
2026-09-11T20:00:00.000Z	27 \| good	5.185 \| good	9.094 \| good	20.928 \| good	0.376 \| good	11.9 \| good	0.153 \| good
2026-09-11T21:00:00.000Z	33 \| good	5.681 \| good	9.74 \| good	18.757 \| good	0.383 \| good	12.677 \| good	0.155 \| good
2026-09-11T22:00:00.000Z	33 \| good	5.716 \| good	9.758 \| good	17.701 \| good	0.364 \| good	11.38 \| good	0.153 \| good
2026-09-11T23:00:00.000Z	33 \| good	6.14 \| good	10.035 \| good	16.721 \| good	0.342 \| good	10.585 \| good	0.152 \| good
2026-09-12T00:00:00.000Z	38 \| good	6.501 \| good	10.703 \| good	17.024 \| good	0.309 \| good	10.668 \| good	0.148 \| good
2026-09-12T01:00:00.000Z	38 \| good	7.061 \| good	10.393 \| good	15.878 \| good	0.272 \| good	9.431 \| good	0.148 \| good
2026-09-12T02:00:00.000Z	44 \| good	8.222 \| good	10.653 \| good	13.826 \| good	0.254 \| good	8.437 \| good	0.147 \| good
2026-09-12T03:00:00.000Z	49 \| good	9.347 \| good	11.762 \| good	11.887 \| good	0.239 \| good	8.158 \| good	0.149 \| good
2026-09-12T04:00:00.000Z	52 \| moderate	9.833 \| good	12.793 \| good	10.839 \| good	0.233 \| good	8.108 \| good	0.15 \| good
2026-09-12T05:00:00.000Z	52 \| moderate	9.715 \| good	13.547 \| good	11.258 \| good	0.252 \| good	8.275 \| good	0.151 \| good
2026-09-12T06:00:00.000Z	52 \| moderate	10.475 \| good	14.052 \| good	13.215 \| good	0.275 \| good	7.746 \| good	0.158 \| good
2026-09-12T07:00:00.000Z	52 \| moderate	10.21 \| good	13.847 \| good	15.542 \| good	0.361 \| good	6.358 \| good	0.164 \| 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?