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

The current PM10 concentration at Hertfordshire, UK is 9.284 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.147 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 30.777 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 4.825 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 3.328 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)

3.33 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

9.28 μg/m³

155

255

425

605+

Ozone (O₃)

30.78 ppb

201

201+

Sulfur Dioxide (SO₂)

0.15 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.83 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.01 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
2025-12-26T19:00:00.000Z	52 \| moderate	9.747 \| good	34.912 \| good	19.844 \| good	0.468 \| good	8.222 \| good	0.008 \| good
2025-12-26T20:00:00.000Z	49 \| good	8.637 \| good	26.851 \| good	22.381 \| good	0.368 \| good	7.885 \| good	0.008 \| good
2025-12-26T21:00:00.000Z	49 \| good	8.709 \| good	27.566 \| good	20.912 \| good	0.427 \| good	7.897 \| good	0.008 \| good
2025-12-26T22:00:00.000Z	52 \| moderate	10.341 \| good	28.934 \| good	19.674 \| good	0.359 \| good	7.961 \| good	0.005 \| good
2025-12-26T23:00:00.000Z	52 \| moderate	9.929 \| good	22.472 \| good	19.363 \| good	0.346 \| good	7.579 \| good	0.005 \| good
2025-12-27T00:00:00.000Z	52 \| moderate	9.882 \| good	24.498 \| good	18.965 \| good	0.455 \| good	4.026 \| good	0.305 \| good
2025-12-27T01:00:00.000Z	52 \| moderate	10.3 \| good	27.632 \| good	17.644 \| good	0.382 \| good	6.446 \| good	0.574 \| good
2025-12-27T02:00:00.000Z	54 \| moderate	10.61 \| good	27.971 \| good	17.63 \| good	0.382 \| good	5.017 \| good	0.228 \| good
2025-12-27T03:00:00.000Z	54 \| moderate	11.315 \| good	23.533 \| good	15.952 \| good	0.476 \| good	10.262 \| good	0.241 \| good
2025-12-27T04:00:00.000Z	54 \| moderate	11.104 \| good	25.866 \| good	17.753 \| good	0.382 \| good	10.589 \| good	0.188 \| good
2025-12-27T05:00:00.000Z	52 \| moderate	10.372 \| good	30.614 \| good	18.294 \| good	0.468 \| good	12.215 \| good	0.169 \| good
2025-12-27T06:00:00.000Z	54 \| moderate	11.174 \| good	32.68 \| good	18.202 \| good	0.304 \| good	11.133 \| good	0.004 \| good
2025-12-27T07:00:00.000Z	54 \| moderate	11.317 \| good	33.559 \| good	17.967 \| good	0.305 \| good	5.655 \| good	0.006 \| good
2025-12-27T08:00:00.000Z	54 \| moderate	10.831 \| good	36.185 \| good	21.613 \| good	0.345 \| good	8.944 \| good	0.007 \| good
2025-12-27T09:00:00.000Z	56 \| moderate	11.661 \| good	28.93 \| good	24.969 \| good	0.309 \| good	5.489 \| good	0.006 \| good
2025-12-27T10:00:00.000Z	44 \| good	8.486 \| good	30.442 \| good	26.029 \| good	0.305 \| good	7.747 \| good	0.004 \| good
2025-12-27T11:00:00.000Z	52 \| moderate	9.699 \| good	24.312 \| good	17.956 \| good	0.306 \| good	7.431 \| good	0.005 \| good
2025-12-27T12:00:00.000Z	49 \| good	8.559 \| good	24.25 \| good	26.003 \| good	0.417 \| good	4.619 \| good	0.006 \| good
2025-12-27T13:00:00.000Z	52 \| moderate	10.2 \| good	27.55 \| good	18.794 \| good	0.422 \| good	4.59 \| good	0.005 \| good
2025-12-27T14:00:00.000Z	52 \| moderate	9.518 \| good	31.539 \| good	17.789 \| good	0.352 \| good	4.494 \| good	0.007 \| good
2025-12-27T15:00:00.000Z	49 \| good	8.942 \| good	28.788 \| good	23.596 \| good	0.304 \| good	4.371 \| good	0.008 \| good
2025-12-27T16:00:00.000Z	52 \| moderate	10.441 \| good	34.894 \| good	15.553 \| good	0.378 \| good	5.529 \| good	0.01 \| good
2025-12-27T17:00:00.000Z	58 \| moderate	13.119 \| fine	29 \| good	27.63 \| good	0.305 \| good	5.368 \| good	0.015 \| good
2025-12-27T18:00:00.000Z	56 \| moderate	11.62 \| good	22.443 \| good	18.44 \| good	0.304 \| good	5.382 \| good	0.019 \| good
2025-12-27T19:00:00.000Z	33 \| good	6.163 \| good	19.977 \| good	22.027 \| good	0.305 \| good	3.247 \| good	0.028 \| good
2025-12-27T20:00:00.000Z	33 \| good	5.504 \| good	23.272 \| good	24.268 \| good	0.304 \| good	3.154 \| good	0.037 \| good
2025-12-27T21:00:00.000Z	44 \| good	8.155 \| good	24.37 \| good	20.244 \| good	0.381 \| good	3.358 \| good	0.028 \| good
2025-12-27T22:00:00.000Z	44 \| good	7.855 \| good	18.8 \| good	24.496 \| good	0.303 \| good	3.665 \| good	0.033 \| good
2025-12-27T23:00:00.000Z	49 \| good	9.362 \| good	25.88 \| good	29.437 \| good	0.383 \| good	5.1 \| good	0.025 \| good
2025-12-28T00:00:00.000Z	30 \| good	4.551 \| good	11.378 \| good	32.411 \| good	0.382 \| good	3.084 \| good	1.101 \| good
2025-12-28T01:00:00.000Z	28 \| good	5.499 \| good	7.08 \| good	29.969 \| good	0.494 \| good	3.571 \| good	1.078 \| good
2025-12-28T02:00:00.000Z	30 \| good	3.69 \| good	12.749 \| good	32.135 \| good	0.382 \| good	8.819 \| good	1.233 \| good
2025-12-28T03:00:00.000Z	31 \| good	5.275 \| good	12.085 \| good	33.69 \| good	0.499 \| good	8.431 \| good	0.638 \| good
2025-12-28T04:00:00.000Z	29 \| good	4.443 \| good	12.314 \| good	30.652 \| good	0.501 \| good	9.771 \| good	0.677 \| good
2025-12-28T05:00:00.000Z	28 \| good	4.202 \| good	6.39 \| good	29.673 \| good	0.499 \| good	9.521 \| good	0.432 \| good
2025-12-28T06:00:00.000Z	30 \| good	4.132 \| good	13.206 \| good	31.707 \| good	0.343 \| good	7.59 \| good	0.008 \| good
2025-12-28T07:00:00.000Z	28 \| good	3.598 \| good	10.57 \| good	30.396 \| good	0.345 \| good	2.776 \| good	0.01 \| good
2025-12-28T08:00:00.000Z	27 \| good	2.173 \| good	14.462 \| good	28.661 \| good	0.148 \| good	1.8 \| good	0.014 \| good
2025-12-28T09:00:00.000Z	28 \| good	2.635 \| good	7.935 \| good	29.92 \| good	0.188 \| good	1.66 \| good	0.014 \| good
2025-12-28T10:00:00.000Z	27 \| good	2.636 \| good	6.6 \| good	29.204 \| good	0.186 \| good	1.698 \| good	0.007 \| good
2025-12-28T11:00:00.000Z	28 \| good	2.304 \| good	8.4 \| good	29.804 \| good	0.177 \| good	1.699 \| good	0.004 \| good
2025-12-28T12:00:00.000Z	25 \| good	3.518 \| good	8.88 \| good	27.373 \| good	0.145 \| good	1.704 \| good	0.004 \| good
2025-12-28T13:00:00.000Z	27 \| good	2.347 \| good	6.68 \| good	28.578 \| good	0.144 \| good	2.125 \| good	0.004 \| good
2025-12-28T14:00:00.000Z	27 \| good	3.038 \| good	7.965 \| good	29.367 \| good	0.144 \| good	2.135 \| good	0.004 \| good
2025-12-28T15:00:00.000Z	27 \| good	2.484 \| good	9.698 \| good	29.303 \| good	0.143 \| good	2.011 \| good	0.005 \| good
2025-12-28T16:00:00.000Z	26 \| good	3.546 \| good	8.88 \| good	27.918 \| good	0.143 \| good	1.674 \| good	0.005 \| good
2025-12-28T17:00:00.000Z	26 \| good	3.664 \| good	6.482 \| good	27.652 \| good	0.145 \| good	1.645 \| good	0.006 \| good
2025-12-28T18:00:00.000Z	29 \| good	3.388 \| good	10.619 \| good	31.474 \| good	0.151 \| good	1.607 \| good	0.006 \| good
2025-12-28T18:00:00.000Z	29 \| good	3.328 \| good	9.284 \| good	30.777 \| good	0.147 \| good	4.825 \| good	0.006 \| good
2025-12-28T19:00:00.000Z	28 \| good	5.476 \| good	13.926 \| good	29.979 \| good	0.334 \| good	3.992 \| good	0.13 \| good
2025-12-28T20:00:00.000Z	33 \| good	5.551 \| good	14.541 \| good	28.676 \| good	0.39 \| good	4.401 \| good	0.13 \| good
2025-12-28T21:00:00.000Z	33 \| good	5.927 \| good	15.137 \| good	27.146 \| good	0.385 \| good	4.744 \| good	0.131 \| good
2025-12-28T22:00:00.000Z	38 \| good	6.594 \| good	13.638 \| good	26.117 \| good	0.344 \| good	5.124 \| good	0.132 \| good
2025-12-28T23:00:00.000Z	33 \| good	6.245 \| good	14.86 \| good	26.062 \| good	0.321 \| good	4.647 \| good	0.132 \| good
2025-12-29T00:00:00.000Z	33 \| good	6.165 \| good	12.655 \| good	26.587 \| good	0.289 \| good	3.856 \| good	0.131 \| good
2025-12-29T01:00:00.000Z	33 \| good	5.992 \| good	12.116 \| good	27.092 \| good	0.269 \| good	3.376 \| good	0.129 \| good
2025-12-29T02:00:00.000Z	27 \| good	5.389 \| good	12.241 \| good	27.792 \| good	0.254 \| good	2.876 \| good	0.127 \| good
2025-12-29T03:00:00.000Z	27 \| good	4.589 \| good	11.946 \| good	28.42 \| good	0.243 \| good	2.306 \| good	0.124 \| good
2025-12-29T04:00:00.000Z	27 \| good	3.989 \| good	10.5 \| good	28.783 \| good	0.237 \| good	2.015 \| good	0.122 \| good
2025-12-29T05:00:00.000Z	27 \| good	3.726 \| good	9.558 \| good	28.783 \| good	0.238 \| good	2.076 \| good	0.121 \| good
2025-12-29T06:00:00.000Z	26 \| good	3.739 \| good	8.997 \| good	28.4 \| good	0.265 \| good	2.294 \| good	0.12 \| good
2025-12-29T07:00:00.000Z	26 \| good	3.824 \| good	8.781 \| good	27.667 \| good	0.372 \| good	3.369 \| good	0.121 \| good
2025-12-29T08:00:00.000Z	24 \| good	4.075 \| good	8.844 \| good	25.843 \| good	0.489 \| good	5.273 \| good	0.127 \| good
2025-12-29T09:00:00.000Z	22 \| good	4.337 \| good	9.139 \| good	22.284 \| good	0.565 \| good	6.835 \| good	0.13 \| good
2025-12-29T10:00:00.000Z	22 \| good	4.322 \| good	9.723 \| good	22.898 \| good	0.607 \| good	6.511 \| good	0.13 \| good
2025-12-29T11:00:00.000Z	24 \| good	4.009 \| good	10.406 \| good	25.768 \| good	0.557 \| good	5.827 \| good	0.129 \| good
2025-12-29T12:00:00.000Z	25 \| good	3.959 \| good	8.979 \| good	26.678 \| good	0.434 \| good	5.099 \| good	0.127 \| good
2025-12-29T13:00:00.000Z	27 \| good	3.207 \| good	8.052 \| good	28.995 \| good	0.339 \| good	4.051 \| good	0.123 \| good
2025-12-29T14:00:00.000Z	29 \| good	2.765 \| good	8.571 \| good	30.667 \| good	0.303 \| good	3.84 \| good	0.123 \| good
2025-12-29T15:00:00.000Z	29 \| good	3.175 \| good	9.247 \| good	31.476 \| good	0.349 \| good	4.081 \| good	0.126 \| good
2025-12-29T16:00:00.000Z	28 \| good	3.288 \| good	10.163 \| good	30.108 \| good	0.32 \| good	4.687 \| good	0.126 \| good
2025-12-29T17:00:00.000Z	26 \| good	3.921 \| good	10.498 \| good	28.441 \| good	0.412 \| good	5.596 \| good	0.128 \| good
2025-12-29T18:00:00.000Z	27 \| good	5.167 \| good	10.579 \| good	24.978 \| good	0.501 \| good	6.539 \| good	0.133 \| good
2025-12-29T19:00:00.000Z	27 \| good	5.348 \| good	11.03 \| good	24.454 \| good	0.519 \| good	6.083 \| good	0.136 \| good
2025-12-29T20:00:00.000Z	33 \| good	6.052 \| good	11.543 \| good	25.213 \| good	0.554 \| good	5.403 \| good	0.135 \| good
2025-12-29T21:00:00.000Z	38 \| good	6.801 \| good	12.098 \| good	26.174 \| good	0.613 \| good	4.958 \| good	0.135 \| good
2025-12-29T22:00:00.000Z	38 \| good	6.858 \| good	11.336 \| good	27.141 \| good	0.545 \| good	4.425 \| good	0.134 \| good
2025-12-29T23:00:00.000Z	27 \| good	5.353 \| good	10.979 \| good	28.248 \| good	0.373 \| good	3.59 \| good	0.132 \| good
2025-12-30T00:00:00.000Z	27 \| good	4.868 \| good	9.783 \| good	28.54 \| good	0.269 \| good	2.768 \| good	0.128 \| good
2025-12-30T01:00:00.000Z	28 \| good	4.318 \| good	9.111 \| good	29.66 \| good	0.229 \| good	2.064 \| good	0.124 \| good
2025-12-30T02:00:00.000Z	30 \| good	3.5 \| good	10.057 \| good	31.505 \| good	0.188 \| good	1.366 \| good	0.123 \| good
2025-12-30T03:00:00.000Z	30 \| good	3.205 \| good	10.809 \| good	32.221 \| good	0.173 \| good	1.08 \| good	0.123 \| good
2025-12-30T04:00:00.000Z	30 \| good	3.198 \| good	11.413 \| good	32.202 \| good	0.177 \| good	1.198 \| good	0.122 \| good
2025-12-30T05:00:00.000Z	30 \| good	3.711 \| good	11.158 \| good	31.976 \| good	0.19 \| good	1.292 \| good	0.121 \| good
2025-12-30T06:00:00.000Z	30 \| good	3.998 \| good	10.501 \| good	32.11 \| good	0.264 \| good	1.546 \| good	0.121 \| good
2025-12-30T07:00:00.000Z	31 \| good	3.81 \| good	10.188 \| good	33.174 \| good	0.346 \| good	2.441 \| good	0.123 \| good
2025-12-30T08:00:00.000Z	30 \| good	3.976 \| good	10.389 \| good	31.762 \| good	0.497 \| good	4.328 \| good	0.129 \| good
2025-12-30T09:00:00.000Z	29 \| good	4.166 \| good	10.739 \| good	30.519 \| good	0.629 \| good	5.967 \| good	0.133 \| good
2025-12-30T10:00:00.000Z	29 \| good	4.312 \| good	10.92 \| good	30.647 \| good	0.65 \| good	6.214 \| good	0.135 \| good
2025-12-30T11:00:00.000Z	29 \| good	4.382 \| good	10.66 \| good	30.738 \| good	0.621 \| good	5.474 \| good	0.134 \| good
2025-12-30T12:00:00.000Z	30 \| good	3.907 \| good	10.293 \| good	31.919 \| good	0.525 \| good	4.66 \| good	0.133 \| good
2025-12-30T13:00:00.000Z	30 \| good	3.794 \| good	10.626 \| good	32.25 \| good	0.474 \| good	4.167 \| good	0.133 \| good
2025-12-30T14:00:00.000Z	30 \| good	3.887 \| good	10.264 \| good	32.477 \| good	0.55 \| good	4.209 \| good	0.134 \| good
2025-12-30T15:00:00.000Z	30 \| good	3.989 \| good	9.685 \| good	32.229 \| good	0.563 \| good	4.868 \| good	0.137 \| good
2025-12-30T16:00:00.000Z	29 \| good	4.167 \| good	9.921 \| good	30.721 \| good	0.594 \| good	5.985 \| good	0.139 \| good
2025-12-30T17:00:00.000Z	27 \| good	4.534 \| good	12.541 \| good	27.247 \| good	0.667 \| good	6.933 \| good	0.144 \| good
2025-12-30T18:00:00.000Z	27 \| good	5.072 \| good	15.354 \| good	23.171 \| good	0.79 \| good	7.944 \| good	0.151 \| 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
Borehamwood, Hertfordshire	31 Good	2.27μg/m³ Good	6.56μg/m³ Good	34.21ppb Good	0.12ppb Good	4.76ppb Good	0.00ppm Good
Bushey, Hertfordshire	30 Good	4.33μg/m³ Good	6.08μg/m³ Good	31.94ppb Good	0.14ppb Good	13.03ppb Good	0.00ppm Good
Watford, Hertfordshire	30 Good	4.33μg/m³ Good	6.08μg/m³ Good	31.94ppb Good	0.14ppb Good	13.03ppb Good	0.00ppm Good
Abbots Langley, Hertfordshire	29 Good	3.50μg/m³ Good	6.08μg/m³ Good	31.00ppb Good	0.15ppb Good	6.54ppb Good	0.01ppm Good
Hemel Hempstead, Hertfordshire	29 Good	3.50μg/m³ Good	6.08μg/m³ Good	31.00ppb Good	0.15ppb Good	6.54ppb Good	0.01ppm Good
Baldock, Hertfordshire	29 Good	3.40μg/m³ Good	9.35μg/m³ Good	31.07ppb Good	0.15ppb Good	1.62ppb Good	0.01ppm Good
Hatfield, Hertfordshire	29 Good	2.72μg/m³ Good	11.00μg/m³ Good	31.43ppb Good	0.15ppb Good	1.61ppb Good	0.00ppm Good
Chorleywood, Hertfordshire	30 Good	3.04μg/m³ Good	6.08μg/m³ Good	31.55ppb Good	0.15ppb Good	6.35ppb Good	0.01ppm Good
Harpenden, Hertfordshire	29 Good	3.45μg/m³ Good	9.08μg/m³ Good	30.89ppb Good	0.15ppb Good	6.17ppb Good	0.01ppm Good
Hertford, Hertfordshire	30 Good	2.60μg/m³ Good	10.66μg/m³ Good	31.57ppb Good	0.15ppb Good	1.62ppb Good	0.01ppm Good
Rickmansworth, Hertfordshire	30 Good	3.04μg/m³ Good	6.08μg/m³ Good	31.55ppb Good	0.15ppb Good	6.35ppb Good	0.01ppm Good
St Albans, Hertfordshire	30 Good	3.45μg/m³ Good	11.00μg/m³ Good	31.60ppb Good	0.15ppb Good	6.29ppb Good	0.01ppm Good
Stevenage, Hertfordshire	29 Good	3.40μg/m³ Good	9.35μg/m³ Good	31.07ppb Good	0.15ppb Good	1.62ppb Good	0.01ppm Good
Hitchin, Hertfordshire	29 Good	3.40μg/m³ Good	9.35μg/m³ Good	31.07ppb Good	0.15ppb Good	1.62ppb Good	0.01ppm Good
Letchworth, Hertfordshire	29 Good	3.40μg/m³ Good	9.35μg/m³ Good	31.07ppb Good	0.15ppb Good	1.62ppb Good	0.01ppm Good
Royston, Hertfordshire	29 Good	3.29μg/m³ Good	10.56μg/m³ Good	30.80ppb Good	0.15ppb Good	1.61ppb Good	0.01ppm Good
Ware, Hertfordshire	30 Good	2.50μg/m³ Good	8.10μg/m³ Good	31.70ppb Good	0.15ppb Good	1.60ppb Good	0.01ppm Good
Welwyn Garden City, Hertfordshire	29 Good	3.39μg/m³ Good	10.62μg/m³ Good	31.47ppb Good	0.15ppb Good	1.61ppb Good	0.01ppm Good
Berkhamsted, Hertfordshire	28 Good	3.53μg/m³ Good	6.08μg/m³ Good	30.25ppb Good	0.15ppb Good	1.64ppb Good	0.01ppm Good
Bishop's Stortford, Hertfordshire	28 Good	2.47μg/m³ Good	16.32μg/m³ Good	29.81ppb Good	0.15ppb Good	1.62ppb Good	0.01ppm Good
Sawbridgeworth, Hertfordshire	28 Good	2.47μg/m³ Good	16.32μg/m³ Good	29.81ppb Good	0.15ppb Good	1.62ppb Good	0.01ppm Good
Potters Bar, Hertfordshire	27 Good	5.06μg/m³ Good	11.77μg/m³ Good	28.26ppb Good	0.13ppb Good	14.74ppb Good	0.00ppm Good
Tring, Hertfordshire	28 Good	3.53μg/m³ Good	6.08μg/m³ Good	30.13ppb Good	0.15ppb Good	1.61ppb Good	0.01ppm Good
Waltham Cross, Hertfordshire	27 Good	3.17μg/m³ Good	10.22μg/m³ Good	28.73ppb Good	0.14ppb Good	4.74ppb Good	0.00ppm Good
Cheshunt, Hertfordshire	26 Good	3.56μg/m³ Good	11.06μg/m³ Good	28.48ppb Good	0.14ppb Good	7.09ppb Good	0.00ppm Good
Hoddesdon, Hertfordshire	26 Good	3.75μg/m³ Good	12.08μg/m³ Good	27.78ppb Good	0.14ppb Good	8.78ppb Good	0.00ppm 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 06:00:00 on 2025-12-27.

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 12:00:00 on 2025-12-28.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 29, 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 3.328 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 9.284 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.006 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.147 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 30.777 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 4.825 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-26T19:00:00.000Z	52 \| moderate	9.747 \| good	34.912 \| good	19.844 \| good	0.468 \| good	8.222 \| good	0.008 \| good
2025-12-26T20:00:00.000Z	49 \| good	8.637 \| good	26.851 \| good	22.381 \| good	0.368 \| good	7.885 \| good	0.008 \| good
2025-12-26T21:00:00.000Z	49 \| good	8.709 \| good	27.566 \| good	20.912 \| good	0.427 \| good	7.897 \| good	0.008 \| good
2025-12-26T22:00:00.000Z	52 \| moderate	10.341 \| good	28.934 \| good	19.674 \| good	0.359 \| good	7.961 \| good	0.005 \| good
2025-12-26T23:00:00.000Z	52 \| moderate	9.929 \| good	22.472 \| good	19.363 \| good	0.346 \| good	7.579 \| good	0.005 \| good
2025-12-27T00:00:00.000Z	52 \| moderate	9.882 \| good	24.498 \| good	18.965 \| good	0.455 \| good	4.026 \| good	0.305 \| good
2025-12-27T01:00:00.000Z	52 \| moderate	10.3 \| good	27.632 \| good	17.644 \| good	0.382 \| good	6.446 \| good	0.574 \| good
2025-12-27T02:00:00.000Z	54 \| moderate	10.61 \| good	27.971 \| good	17.63 \| good	0.382 \| good	5.017 \| good	0.228 \| good
2025-12-27T03:00:00.000Z	54 \| moderate	11.315 \| good	23.533 \| good	15.952 \| good	0.476 \| good	10.262 \| good	0.241 \| good
2025-12-27T04:00:00.000Z	54 \| moderate	11.104 \| good	25.866 \| good	17.753 \| good	0.382 \| good	10.589 \| good	0.188 \| good
2025-12-27T05:00:00.000Z	52 \| moderate	10.372 \| good	30.614 \| good	18.294 \| good	0.468 \| good	12.215 \| good	0.169 \| good
2025-12-27T06:00:00.000Z	54 \| moderate	11.174 \| good	32.68 \| good	18.202 \| good	0.304 \| good	11.133 \| good	0.004 \| good
2025-12-27T07:00:00.000Z	54 \| moderate	11.317 \| good	33.559 \| good	17.967 \| good	0.305 \| good	5.655 \| good	0.006 \| good
2025-12-27T08:00:00.000Z	54 \| moderate	10.831 \| good	36.185 \| good	21.613 \| good	0.345 \| good	8.944 \| good	0.007 \| good
2025-12-27T09:00:00.000Z	56 \| moderate	11.661 \| good	28.93 \| good	24.969 \| good	0.309 \| good	5.489 \| good	0.006 \| good
2025-12-27T10:00:00.000Z	44 \| good	8.486 \| good	30.442 \| good	26.029 \| good	0.305 \| good	7.747 \| good	0.004 \| good
2025-12-27T11:00:00.000Z	52 \| moderate	9.699 \| good	24.312 \| good	17.956 \| good	0.306 \| good	7.431 \| good	0.005 \| good
2025-12-27T12:00:00.000Z	49 \| good	8.559 \| good	24.25 \| good	26.003 \| good	0.417 \| good	4.619 \| good	0.006 \| good
2025-12-27T13:00:00.000Z	52 \| moderate	10.2 \| good	27.55 \| good	18.794 \| good	0.422 \| good	4.59 \| good	0.005 \| good
2025-12-27T14:00:00.000Z	52 \| moderate	9.518 \| good	31.539 \| good	17.789 \| good	0.352 \| good	4.494 \| good	0.007 \| good
2025-12-27T15:00:00.000Z	49 \| good	8.942 \| good	28.788 \| good	23.596 \| good	0.304 \| good	4.371 \| good	0.008 \| good
2025-12-27T16:00:00.000Z	52 \| moderate	10.441 \| good	34.894 \| good	15.553 \| good	0.378 \| good	5.529 \| good	0.01 \| good
2025-12-27T17:00:00.000Z	58 \| moderate	13.119 \| fine	29 \| good	27.63 \| good	0.305 \| good	5.368 \| good	0.015 \| good
2025-12-27T18:00:00.000Z	56 \| moderate	11.62 \| good	22.443 \| good	18.44 \| good	0.304 \| good	5.382 \| good	0.019 \| good
2025-12-27T19:00:00.000Z	33 \| good	6.163 \| good	19.977 \| good	22.027 \| good	0.305 \| good	3.247 \| good	0.028 \| good
2025-12-27T20:00:00.000Z	33 \| good	5.504 \| good	23.272 \| good	24.268 \| good	0.304 \| good	3.154 \| good	0.037 \| good
2025-12-27T21:00:00.000Z	44 \| good	8.155 \| good	24.37 \| good	20.244 \| good	0.381 \| good	3.358 \| good	0.028 \| good
2025-12-27T22:00:00.000Z	44 \| good	7.855 \| good	18.8 \| good	24.496 \| good	0.303 \| good	3.665 \| good	0.033 \| good
2025-12-27T23:00:00.000Z	49 \| good	9.362 \| good	25.88 \| good	29.437 \| good	0.383 \| good	5.1 \| good	0.025 \| good
2025-12-28T00:00:00.000Z	30 \| good	4.551 \| good	11.378 \| good	32.411 \| good	0.382 \| good	3.084 \| good	1.101 \| good
2025-12-28T01:00:00.000Z	28 \| good	5.499 \| good	7.08 \| good	29.969 \| good	0.494 \| good	3.571 \| good	1.078 \| good
2025-12-28T02:00:00.000Z	30 \| good	3.69 \| good	12.749 \| good	32.135 \| good	0.382 \| good	8.819 \| good	1.233 \| good
2025-12-28T03:00:00.000Z	31 \| good	5.275 \| good	12.085 \| good	33.69 \| good	0.499 \| good	8.431 \| good	0.638 \| good
2025-12-28T04:00:00.000Z	29 \| good	4.443 \| good	12.314 \| good	30.652 \| good	0.501 \| good	9.771 \| good	0.677 \| good
2025-12-28T05:00:00.000Z	28 \| good	4.202 \| good	6.39 \| good	29.673 \| good	0.499 \| good	9.521 \| good	0.432 \| good
2025-12-28T06:00:00.000Z	30 \| good	4.132 \| good	13.206 \| good	31.707 \| good	0.343 \| good	7.59 \| good	0.008 \| good
2025-12-28T07:00:00.000Z	28 \| good	3.598 \| good	10.57 \| good	30.396 \| good	0.345 \| good	2.776 \| good	0.01 \| good
2025-12-28T08:00:00.000Z	27 \| good	2.173 \| good	14.462 \| good	28.661 \| good	0.148 \| good	1.8 \| good	0.014 \| good
2025-12-28T09:00:00.000Z	28 \| good	2.635 \| good	7.935 \| good	29.92 \| good	0.188 \| good	1.66 \| good	0.014 \| good
2025-12-28T10:00:00.000Z	27 \| good	2.636 \| good	6.6 \| good	29.204 \| good	0.186 \| good	1.698 \| good	0.007 \| good
2025-12-28T11:00:00.000Z	28 \| good	2.304 \| good	8.4 \| good	29.804 \| good	0.177 \| good	1.699 \| good	0.004 \| good
2025-12-28T12:00:00.000Z	25 \| good	3.518 \| good	8.88 \| good	27.373 \| good	0.145 \| good	1.704 \| good	0.004 \| good
2025-12-28T13:00:00.000Z	27 \| good	2.347 \| good	6.68 \| good	28.578 \| good	0.144 \| good	2.125 \| good	0.004 \| good
2025-12-28T14:00:00.000Z	27 \| good	3.038 \| good	7.965 \| good	29.367 \| good	0.144 \| good	2.135 \| good	0.004 \| good
2025-12-28T15:00:00.000Z	27 \| good	2.484 \| good	9.698 \| good	29.303 \| good	0.143 \| good	2.011 \| good	0.005 \| good
2025-12-28T16:00:00.000Z	26 \| good	3.546 \| good	8.88 \| good	27.918 \| good	0.143 \| good	1.674 \| good	0.005 \| good
2025-12-28T17:00:00.000Z	26 \| good	3.664 \| good	6.482 \| good	27.652 \| good	0.145 \| good	1.645 \| good	0.006 \| good
2025-12-28T18:00:00.000Z	29 \| good	3.388 \| good	10.619 \| good	31.474 \| good	0.151 \| good	1.607 \| good	0.006 \| good
2025-12-28T18:00:00.000Z	29 \| good	3.328 \| good	9.284 \| good	30.777 \| good	0.147 \| good	4.825 \| good	0.006 \| good
2025-12-28T19:00:00.000Z	28 \| good	5.476 \| good	13.926 \| good	29.979 \| good	0.334 \| good	3.992 \| good	0.13 \| good
2025-12-28T20:00:00.000Z	33 \| good	5.551 \| good	14.541 \| good	28.676 \| good	0.39 \| good	4.401 \| good	0.13 \| good
2025-12-28T21:00:00.000Z	33 \| good	5.927 \| good	15.137 \| good	27.146 \| good	0.385 \| good	4.744 \| good	0.131 \| good
2025-12-28T22:00:00.000Z	38 \| good	6.594 \| good	13.638 \| good	26.117 \| good	0.344 \| good	5.124 \| good	0.132 \| good
2025-12-28T23:00:00.000Z	33 \| good	6.245 \| good	14.86 \| good	26.062 \| good	0.321 \| good	4.647 \| good	0.132 \| good
2025-12-29T00:00:00.000Z	33 \| good	6.165 \| good	12.655 \| good	26.587 \| good	0.289 \| good	3.856 \| good	0.131 \| good
2025-12-29T01:00:00.000Z	33 \| good	5.992 \| good	12.116 \| good	27.092 \| good	0.269 \| good	3.376 \| good	0.129 \| good
2025-12-29T02:00:00.000Z	27 \| good	5.389 \| good	12.241 \| good	27.792 \| good	0.254 \| good	2.876 \| good	0.127 \| good
2025-12-29T03:00:00.000Z	27 \| good	4.589 \| good	11.946 \| good	28.42 \| good	0.243 \| good	2.306 \| good	0.124 \| good
2025-12-29T04:00:00.000Z	27 \| good	3.989 \| good	10.5 \| good	28.783 \| good	0.237 \| good	2.015 \| good	0.122 \| good
2025-12-29T05:00:00.000Z	27 \| good	3.726 \| good	9.558 \| good	28.783 \| good	0.238 \| good	2.076 \| good	0.121 \| good
2025-12-29T06:00:00.000Z	26 \| good	3.739 \| good	8.997 \| good	28.4 \| good	0.265 \| good	2.294 \| good	0.12 \| good
2025-12-29T07:00:00.000Z	26 \| good	3.824 \| good	8.781 \| good	27.667 \| good	0.372 \| good	3.369 \| good	0.121 \| good
2025-12-29T08:00:00.000Z	24 \| good	4.075 \| good	8.844 \| good	25.843 \| good	0.489 \| good	5.273 \| good	0.127 \| good
2025-12-29T09:00:00.000Z	22 \| good	4.337 \| good	9.139 \| good	22.284 \| good	0.565 \| good	6.835 \| good	0.13 \| good
2025-12-29T10:00:00.000Z	22 \| good	4.322 \| good	9.723 \| good	22.898 \| good	0.607 \| good	6.511 \| good	0.13 \| good
2025-12-29T11:00:00.000Z	24 \| good	4.009 \| good	10.406 \| good	25.768 \| good	0.557 \| good	5.827 \| good	0.129 \| good
2025-12-29T12:00:00.000Z	25 \| good	3.959 \| good	8.979 \| good	26.678 \| good	0.434 \| good	5.099 \| good	0.127 \| good
2025-12-29T13:00:00.000Z	27 \| good	3.207 \| good	8.052 \| good	28.995 \| good	0.339 \| good	4.051 \| good	0.123 \| good
2025-12-29T14:00:00.000Z	29 \| good	2.765 \| good	8.571 \| good	30.667 \| good	0.303 \| good	3.84 \| good	0.123 \| good
2025-12-29T15:00:00.000Z	29 \| good	3.175 \| good	9.247 \| good	31.476 \| good	0.349 \| good	4.081 \| good	0.126 \| good
2025-12-29T16:00:00.000Z	28 \| good	3.288 \| good	10.163 \| good	30.108 \| good	0.32 \| good	4.687 \| good	0.126 \| good
2025-12-29T17:00:00.000Z	26 \| good	3.921 \| good	10.498 \| good	28.441 \| good	0.412 \| good	5.596 \| good	0.128 \| good
2025-12-29T18:00:00.000Z	27 \| good	5.167 \| good	10.579 \| good	24.978 \| good	0.501 \| good	6.539 \| good	0.133 \| good
2025-12-29T19:00:00.000Z	27 \| good	5.348 \| good	11.03 \| good	24.454 \| good	0.519 \| good	6.083 \| good	0.136 \| good
2025-12-29T20:00:00.000Z	33 \| good	6.052 \| good	11.543 \| good	25.213 \| good	0.554 \| good	5.403 \| good	0.135 \| good
2025-12-29T21:00:00.000Z	38 \| good	6.801 \| good	12.098 \| good	26.174 \| good	0.613 \| good	4.958 \| good	0.135 \| good
2025-12-29T22:00:00.000Z	38 \| good	6.858 \| good	11.336 \| good	27.141 \| good	0.545 \| good	4.425 \| good	0.134 \| good
2025-12-29T23:00:00.000Z	27 \| good	5.353 \| good	10.979 \| good	28.248 \| good	0.373 \| good	3.59 \| good	0.132 \| good
2025-12-30T00:00:00.000Z	27 \| good	4.868 \| good	9.783 \| good	28.54 \| good	0.269 \| good	2.768 \| good	0.128 \| good
2025-12-30T01:00:00.000Z	28 \| good	4.318 \| good	9.111 \| good	29.66 \| good	0.229 \| good	2.064 \| good	0.124 \| good
2025-12-30T02:00:00.000Z	30 \| good	3.5 \| good	10.057 \| good	31.505 \| good	0.188 \| good	1.366 \| good	0.123 \| good
2025-12-30T03:00:00.000Z	30 \| good	3.205 \| good	10.809 \| good	32.221 \| good	0.173 \| good	1.08 \| good	0.123 \| good
2025-12-30T04:00:00.000Z	30 \| good	3.198 \| good	11.413 \| good	32.202 \| good	0.177 \| good	1.198 \| good	0.122 \| good
2025-12-30T05:00:00.000Z	30 \| good	3.711 \| good	11.158 \| good	31.976 \| good	0.19 \| good	1.292 \| good	0.121 \| good
2025-12-30T06:00:00.000Z	30 \| good	3.998 \| good	10.501 \| good	32.11 \| good	0.264 \| good	1.546 \| good	0.121 \| good
2025-12-30T07:00:00.000Z	31 \| good	3.81 \| good	10.188 \| good	33.174 \| good	0.346 \| good	2.441 \| good	0.123 \| good
2025-12-30T08:00:00.000Z	30 \| good	3.976 \| good	10.389 \| good	31.762 \| good	0.497 \| good	4.328 \| good	0.129 \| good
2025-12-30T09:00:00.000Z	29 \| good	4.166 \| good	10.739 \| good	30.519 \| good	0.629 \| good	5.967 \| good	0.133 \| good
2025-12-30T10:00:00.000Z	29 \| good	4.312 \| good	10.92 \| good	30.647 \| good	0.65 \| good	6.214 \| good	0.135 \| good
2025-12-30T11:00:00.000Z	29 \| good	4.382 \| good	10.66 \| good	30.738 \| good	0.621 \| good	5.474 \| good	0.134 \| good
2025-12-30T12:00:00.000Z	30 \| good	3.907 \| good	10.293 \| good	31.919 \| good	0.525 \| good	4.66 \| good	0.133 \| good
2025-12-30T13:00:00.000Z	30 \| good	3.794 \| good	10.626 \| good	32.25 \| good	0.474 \| good	4.167 \| good	0.133 \| good
2025-12-30T14:00:00.000Z	30 \| good	3.887 \| good	10.264 \| good	32.477 \| good	0.55 \| good	4.209 \| good	0.134 \| good
2025-12-30T15:00:00.000Z	30 \| good	3.989 \| good	9.685 \| good	32.229 \| good	0.563 \| good	4.868 \| good	0.137 \| good
2025-12-30T16:00:00.000Z	29 \| good	4.167 \| good	9.921 \| good	30.721 \| good	0.594 \| good	5.985 \| good	0.139 \| good
2025-12-30T17:00:00.000Z	27 \| good	4.534 \| good	12.541 \| good	27.247 \| good	0.667 \| good	6.933 \| good	0.144 \| good
2025-12-30T18:00:00.000Z	27 \| good	5.072 \| good	15.354 \| good	23.171 \| good	0.79 \| good	7.944 \| good	0.151 \| 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?