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

The current PM10 concentration at Hertfordshire, UK is 17.22 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.331 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 29.846 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 4.204 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 5.377 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)

4.76 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

14.38 μg/m³

155

255

425

605+

Ozone (O₃)

35.47 ppb

201

201+

Sulfur Dioxide (SO₂)

0.42 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

3.66 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.02 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
2026-03-27T21:00:00.000Z	49 \| good	9.295 \| good	23.614 \| good	32.549 \| good	0.544 \| good	9.024 \| good	0.02 \| good
2026-03-27T22:00:00.000Z	29 \| good	4.797 \| good	18.192 \| good	30.588 \| good	0.608 \| good	9.393 \| good	0.019 \| good
2026-03-27T23:00:00.000Z	49 \| good	8.976 \| good	16.388 \| good	23.653 \| good	0.602 \| good	12.868 \| good	0.016 \| good
2026-03-28T00:00:00.000Z	38 \| good	6.515 \| good	24.338 \| good	25.17 \| good	0.47 \| good	7.401 \| good	0.273 \| good
2026-03-28T01:00:00.000Z	49 \| good	8.661 \| good	21.6 \| good	24.505 \| good	0.527 \| good	7.303 \| good	0.23 \| good
2026-03-28T02:00:00.000Z	52 \| moderate	9.81 \| good	20.6 \| good	25.35 \| good	0.433 \| good	6.997 \| good	0.217 \| good
2026-03-28T03:00:00.000Z	49 \| good	8.817 \| good	30.032 \| good	27.93 \| good	0.433 \| good	4 \| good	0.209 \| good
2026-03-28T04:00:00.000Z	44 \| good	7.839 \| good	24.012 \| good	29.464 \| good	0.382 \| good	4.652 \| good	0.203 \| good
2026-03-28T05:00:00.000Z	52 \| moderate	10.114 \| good	13.559 \| good	30.176 \| good	0.382 \| good	4.272 \| good	0.2 \| good
2026-03-28T06:00:00.000Z	38 \| good	7.138 \| good	14.795 \| good	33.666 \| good	0.382 \| good	4.364 \| good	0.198 \| good
2026-03-28T07:00:00.000Z	38 \| good	6.926 \| good	19.717 \| good	31.486 \| good	0.507 \| good	3.423 \| good	0.011 \| good
2026-03-28T08:00:00.000Z	29 \| good	5.464 \| good	23.884 \| good	31.106 \| good	0.421 \| good	6.14 \| good	0.013 \| good
2026-03-28T09:00:00.000Z	33 \| good	6.342 \| good	20.576 \| good	29.23 \| good	0.491 \| good	5.214 \| good	0.014 \| good
2026-03-28T10:00:00.000Z	33 \| good	6.052 \| good	24.796 \| good	32.509 \| good	0.423 \| good	6.676 \| good	0.015 \| good
2026-03-28T11:00:00.000Z	44 \| good	8.045 \| good	18.661 \| good	30.605 \| good	0.351 \| good	6.803 \| good	0.015 \| good
2026-03-28T12:00:00.000Z	44 \| good	7.652 \| good	12.692 \| good	32.57 \| good	0.423 \| good	5.717 \| good	0.015 \| good
2026-03-28T13:00:00.000Z	44 \| good	7.901 \| good	26 \| good	31.02 \| good	0.351 \| good	7.241 \| good	0.015 \| good
2026-03-28T14:00:00.000Z	49 \| good	9.005 \| good	23.2 \| good	33.124 \| good	0.351 \| good	6.492 \| good	0.014 \| good
2026-03-28T15:00:00.000Z	44 \| good	8.122 \| good	19.866 \| good	29.624 \| good	0.351 \| good	7.685 \| good	0.017 \| good
2026-03-28T16:00:00.000Z	38 \| good	7.448 \| good	22.23 \| good	36.952 \| good	0.425 \| good	7.287 \| good	0.015 \| good
2026-03-28T17:00:00.000Z	35 \| good	6.25 \| good	23.158 \| good	37.831 \| good	0.424 \| good	7.252 \| good	0.015 \| good
2026-03-28T18:00:00.000Z	52 \| moderate	10.105 \| good	22.183 \| good	37.487 \| good	0.351 \| good	5.163 \| good	0.015 \| good
2026-03-28T19:00:00.000Z	44 \| good	8.293 \| good	19.01 \| good	38.109 \| good	0.419 \| good	4.951 \| good	0.017 \| good
2026-03-28T20:00:00.000Z	38 \| good	7.318 \| good	18.226 \| good	36.993 \| good	0.35 \| good	7.659 \| good	0.017 \| good
2026-03-28T21:00:00.000Z	49 \| good	8.639 \| good	32.644 \| good	37.708 \| good	0.35 \| good	8.121 \| good	0.016 \| good
2026-03-28T22:00:00.000Z	34 \| good	6.295 \| good	26.386 \| good	37.028 \| good	0.351 \| good	4.776 \| good	0.016 \| good
2026-03-28T23:00:00.000Z	33 \| good	5.915 \| good	22.259 \| good	36.272 \| good	0.351 \| good	8.846 \| good	0.016 \| good
2026-03-29T00:00:00.000Z	35 \| good	6.264 \| good	15.029 \| good	37.603 \| good	0.482 \| good	9.008 \| good	0.266 \| good
2026-03-29T01:00:00.000Z	38 \| good	6.62 \| good	13.966 \| good	35.67 \| good	0.382 \| good	8.569 \| good	0.264 \| good
2026-03-29T02:00:00.000Z	31 \| good	4.684 \| good	13.433 \| good	32.54 \| good	0.382 \| good	6.79 \| good	0.247 \| good
2026-03-29T03:00:00.000Z	29 \| good	4.467 \| good	13.389 \| good	30.545 \| good	0.382 \| good	4.758 \| good	0.299 \| good
2026-03-29T04:00:00.000Z	29 \| good	5.486 \| good	13.112 \| good	30.712 \| good	0.382 \| good	3.119 \| good	0.285 \| good
2026-03-29T05:00:00.000Z	27 \| good	4.743 \| good	14.496 \| good	25.928 \| good	0.329 \| good	3.618 \| good	0.015 \| good
2026-03-29T06:00:00.000Z	33 \| good	5.52 \| good	14.339 \| good	27.121 \| good	0.331 \| good	3.614 \| good	0.015 \| good
2026-03-29T07:00:00.000Z	27 \| good	4.98 \| good	15.198 \| good	27.072 \| good	0.472 \| good	4.36 \| good	0.015 \| good
2026-03-29T08:00:00.000Z	33 \| good	5.664 \| good	18.62 \| good	27.229 \| good	0.516 \| good	6.004 \| good	0.016 \| good
2026-03-29T09:00:00.000Z	27 \| good	5.308 \| good	17.885 \| good	25.881 \| good	0.565 \| good	7.862 \| good	0.018 \| good
2026-03-29T10:00:00.000Z	27 \| good	4.548 \| good	18.572 \| good	25.93 \| good	0.399 \| good	5.092 \| good	0.017 \| good
2026-03-29T11:00:00.000Z	27 \| good	5.453 \| good	14.922 \| good	23.852 \| good	0.402 \| good	6.245 \| good	0.014 \| good
2026-03-29T12:00:00.000Z	33 \| good	5.883 \| good	13.643 \| good	24.923 \| good	0.329 \| good	4.805 \| good	0.013 \| good
2026-03-29T13:00:00.000Z	27 \| good	5.453 \| good	22.359 \| good	24.508 \| good	0.329 \| good	3.758 \| good	0.015 \| good
2026-03-29T14:00:00.000Z	33 \| good	5.537 \| good	23.427 \| good	28.313 \| good	0.41 \| good	4.795 \| good	0.014 \| good
2026-03-29T15:00:00.000Z	33 \| good	5.678 \| good	18.133 \| good	30.912 \| good	0.329 \| good	3.865 \| good	0.015 \| good
2026-03-29T16:00:00.000Z	33 \| good	5.543 \| good	18.824 \| good	31 \| good	0.329 \| good	2.865 \| good	0.015 \| good
2026-03-29T17:00:00.000Z	33 \| good	5.56 \| good	15.015 \| good	33.066 \| good	0.329 \| good	2.381 \| good	0.015 \| good
2026-03-29T18:00:00.000Z	32 \| good	5.328 \| good	15.143 \| good	34.652 \| good	0.329 \| good	3.912 \| good	0.014 \| good
2026-03-29T19:00:00.000Z	34 \| good	5.255 \| good	18.583 \| good	37.345 \| good	0.329 \| good	3.232 \| good	0.016 \| good
2026-03-29T20:00:00.000Z	35 \| good	4.499 \| good	13.419 \| good	37.83 \| good	0.402 \| good	2.707 \| good	0.021 \| good
2026-03-29T20:00:00.000Z	32 \| good	4.765 \| good	14.378 \| good	35.469 \| good	0.416 \| good	3.66 \| good	0.02 \| good
2026-03-29T16:00:00.000Z	42 \| good	4.128 \| good	7.792 \| good	44.766 \| good	0.113 \| good	2.153 \| good	0.143 \| good
2026-03-29T17:00:00.000Z	42 \| good	4.541 \| good	7.976 \| good	44.596 \| good	0.115 \| good	2.362 \| good	0.143 \| good
2026-03-29T18:00:00.000Z	41 \| good	4.846 \| good	6.825 \| good	44.094 \| good	0.179 \| good	2.801 \| good	0.14 \| good
2026-03-29T19:00:00.000Z	41 \| good	4.283 \| good	6.23 \| good	43.543 \| good	0.203 \| good	3.032 \| good	0.135 \| good
2026-03-29T20:00:00.000Z	40 \| good	4.654 \| good	6.632 \| good	42.985 \| good	0.213 \| good	2.945 \| good	0.132 \| good
2026-03-29T21:00:00.000Z	39 \| good	4.844 \| good	7.44 \| good	41.853 \| good	0.234 \| good	2.839 \| good	0.129 \| good
2026-03-29T22:00:00.000Z	38 \| good	5.046 \| good	8.365 \| good	40.992 \| good	0.221 \| good	2.662 \| good	0.126 \| good
2026-03-29T23:00:00.000Z	37 \| good	5.308 \| good	9.102 \| good	40.228 \| good	0.209 \| good	2.223 \| good	0.123 \| good
2026-03-30T00:00:00.000Z	37 \| good	5.386 \| good	9.805 \| good	39.736 \| good	0.214 \| good	2.095 \| good	0.119 \| good
2026-03-30T01:00:00.000Z	35 \| good	5.105 \| good	10.311 \| good	37.561 \| good	0.226 \| good	1.933 \| good	0.117 \| good
2026-03-30T02:00:00.000Z	34 \| good	4.979 \| good	10.825 \| good	37.212 \| good	0.227 \| good	1.706 \| good	0.116 \| good
2026-03-30T03:00:00.000Z	34 \| good	5.071 \| good	11.69 \| good	36.969 \| good	0.232 \| good	1.554 \| good	0.116 \| good
2026-03-30T04:00:00.000Z	34 \| good	5.275 \| good	12.983 \| good	37.471 \| good	0.237 \| good	1.427 \| good	0.115 \| good
2026-03-30T05:00:00.000Z	35 \| good	5.516 \| good	13.028 \| good	37.781 \| good	0.234 \| good	1.769 \| good	0.115 \| good
2026-03-30T06:00:00.000Z	34 \| good	5.932 \| good	13.914 \| good	37.401 \| good	0.24 \| good	2.614 \| good	0.116 \| good
2026-03-30T07:00:00.000Z	35 \| good	6.203 \| good	14.96 \| good	37.94 \| good	0.257 \| good	3.186 \| good	0.119 \| good
2026-03-30T08:00:00.000Z	38 \| good	6.188 \| good	12.418 \| good	40.949 \| good	0.311 \| good	3.058 \| good	0.119 \| good
2026-03-30T09:00:00.000Z	39 \| good	5.216 \| good	12.319 \| good	41.763 \| good	0.23 \| good	2.518 \| good	0.118 \| good
2026-03-30T10:00:00.000Z	40 \| good	5.202 \| good	13.848 \| good	43.466 \| good	0.209 \| good	2.15 \| good	0.12 \| good
2026-03-30T11:00:00.000Z	42 \| good	5.308 \| good	12.332 \| good	45.053 \| good	0.209 \| good	2.101 \| good	0.12 \| good
2026-03-30T12:00:00.000Z	43 \| good	5.031 \| good	11.922 \| good	46.093 \| good	0.208 \| good	1.994 \| good	0.121 \| good
2026-03-30T13:00:00.000Z	45 \| good	4.748 \| good	11.465 \| good	48.817 \| good	0.205 \| good	1.793 \| good	0.123 \| good
2026-03-30T14:00:00.000Z	47 \| good	4.532 \| good	10.485 \| good	51.22 \| good	0.204 \| good	1.602 \| good	0.123 \| good
2026-03-30T15:00:00.000Z	48 \| good	4.448 \| good	10.175 \| good	51.71 \| good	0.209 \| good	1.724 \| good	0.122 \| good
2026-03-30T16:00:00.000Z	48 \| good	4.554 \| good	10.251 \| good	51.529 \| good	0.222 \| good	2.057 \| good	0.124 \| good
2026-03-30T17:00:00.000Z	46 \| good	4.639 \| good	10.318 \| good	49.999 \| good	0.234 \| good	2.579 \| good	0.127 \| good
2026-03-30T18:00:00.000Z	44 \| good	4.852 \| good	10.223 \| good	47.371 \| good	0.283 \| good	3.699 \| good	0.132 \| good
2026-03-30T19:00:00.000Z	40 \| good	5.529 \| good	10.149 \| good	43.266 \| good	0.359 \| good	4.465 \| good	0.133 \| good
2026-03-30T20:00:00.000Z	38 \| good	6.12 \| good	10.639 \| good	41.001 \| good	0.421 \| good	4.794 \| good	0.134 \| good
2026-03-30T21:00:00.000Z	38 \| good	6.632 \| good	10.894 \| good	41.447 \| good	0.377 \| good	4.49 \| good	0.134 \| good
2026-03-30T22:00:00.000Z	38 \| good	7.362 \| good	10.944 \| good	39.85 \| good	0.384 \| good	4.629 \| good	0.135 \| good
2026-03-30T23:00:00.000Z	44 \| good	7.542 \| good	11.738 \| good	37.177 \| good	0.409 \| good	4.836 \| good	0.136 \| good
2026-03-31T00:00:00.000Z	44 \| good	7.613 \| good	12.948 \| good	34.546 \| good	0.407 \| good	5.123 \| good	0.136 \| good
2026-03-31T01:00:00.000Z	44 \| good	7.976 \| good	13.793 \| good	32.633 \| good	0.383 \| good	4.785 \| good	0.136 \| good
2026-03-31T02:00:00.000Z	49 \| good	8.505 \| good	14.322 \| good	31.523 \| good	0.385 \| good	4.256 \| good	0.135 \| good
2026-03-31T03:00:00.000Z	49 \| good	8.63 \| good	14.549 \| good	31.284 \| good	0.347 \| good	3.87 \| good	0.134 \| good
2026-03-31T04:00:00.000Z	49 \| good	8.591 \| good	13.969 \| good	31.197 \| good	0.273 \| good	3.817 \| good	0.133 \| good
2026-03-31T05:00:00.000Z	44 \| good	8.059 \| good	14.271 \| good	29.379 \| good	0.29 \| good	4.142 \| good	0.132 \| good
2026-03-31T06:00:00.000Z	44 \| good	7.845 \| good	14.473 \| good	28.073 \| good	0.401 \| good	5.479 \| good	0.136 \| good
2026-03-31T07:00:00.000Z	44 \| good	7.849 \| good	14.714 \| good	26.431 \| good	0.433 \| good	6.765 \| good	0.14 \| good
2026-03-31T08:00:00.000Z	38 \| good	6.867 \| good	13.503 \| good	26.411 \| good	0.531 \| good	7.907 \| good	0.144 \| good
2026-03-31T09:00:00.000Z	33 \| good	6.478 \| good	10.672 \| good	26.031 \| good	0.431 \| good	7.451 \| good	0.14 \| good
2026-03-31T10:00:00.000Z	33 \| good	6.172 \| good	9.077 \| good	26.388 \| good	0.305 \| good	5.584 \| good	0.135 \| good
2026-03-31T11:00:00.000Z	27 \| good	5.407 \| good	8.161 \| good	28.045 \| good	0.27 \| good	4.208 \| good	0.129 \| good
2026-03-31T12:00:00.000Z	27 \| good	5.229 \| good	7.037 \| good	29.322 \| good	0.216 \| good	4.076 \| good	0.126 \| good
2026-03-31T13:00:00.000Z	28 \| good	4.811 \| good	7.112 \| good	30.29 \| good	0.232 \| good	3.774 \| good	0.126 \| good
2026-03-31T14:00:00.000Z	29 \| good	4.912 \| good	7.304 \| good	30.587 \| good	0.237 \| good	4.497 \| good	0.128 \| good
2026-03-31T15:00:00.000Z	29 \| good	4.936 \| good	7.118 \| good	30.765 \| good	0.223 \| good	4.727 \| good	0.129 \| good

Hertfordshire

Get reliable air quality data to drive your business

Hertfordshire, UK air quality map: Track AQI near you

Air quality in cities of Hertfordshire, UK

City	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
Abbots Langley, Hertfordshire	29 Good	5.49μg/m³ Good	17.82μg/m³ Good	31.05ppb Good	0.33ppb Good	2.85ppb Good	0.01ppm Good
Baldock, Hertfordshire	28 Good	4.65μg/m³ Good	20.47μg/m³ Good	29.55ppb Good	0.33ppb Good	3.33ppb Good	0.02ppm Good
Berkhamsted, Hertfordshire	29 Good	4.69μg/m³ Good	18.58μg/m³ Good	30.92ppb Good	0.33ppb Good	3.00ppb Good	0.02ppm Good
Bishop's Stortford, Hertfordshire	27 Good	4.26μg/m³ Good	22.15μg/m³ Good	29.06ppb Good	0.34ppb Good	3.67ppb Good	0.02ppm Good
Borehamwood, Hertfordshire	27 Good	5.42μg/m³ Good	9.56μg/m³ Good	27.52ppb Good	0.33ppb Good	3.15ppb Good	0.00ppm Good
Bushey, Hertfordshire	33 Good	6.34μg/m³ Good	11.78μg/m³ Good	27.58ppb Good	0.34ppb Good	7.32ppb Good	0.00ppm Good
Cheshunt, Hertfordshire	33 Good	5.95μg/m³ Good	14.53μg/m³ Good	29.20ppb Good	0.33ppb Good	5.43ppb Good	0.01ppm Good
Chorleywood, Hertfordshire	33 Good	5.71μg/m³ Good	15.33μg/m³ Good	31.34ppb Good	0.33ppb Good	4.90ppb Good	0.01ppm Good
Harpenden, Hertfordshire	33 Good	5.53μg/m³ Good	23.16μg/m³ Good	30.67ppb Good	0.33ppb Good	4.31ppb Good	0.02ppm Good
Hatfield, Hertfordshire	33 Good	5.78μg/m³ Good	15.80μg/m³ Good	31.37ppb Good	0.33ppb Good	4.92ppb Good	0.01ppm Good
Hemel Hempstead, Hertfordshire	29 Good	5.49μg/m³ Good	17.82μg/m³ Good	31.05ppb Good	0.33ppb Good	2.85ppb Good	0.01ppm Good
Hertford, Hertfordshire	29 Good	5.43μg/m³ Good	15.80μg/m³ Good	30.57ppb Good	0.33ppb Good	5.40ppb Good	0.01ppm Good
Hitchin, Hertfordshire	27 Good	4.67μg/m³ Good	22.77μg/m³ Good	28.59ppb Good	0.33ppb Good	3.33ppb Good	0.02ppm Good
Hoddesdon, Hertfordshire	33 Good	6.32μg/m³ Good	17.34μg/m³ Good	28.72ppb Good	0.33ppb Good	5.89ppb Good	0.01ppm Good
Letchworth, Hertfordshire	27 Good	4.67μg/m³ Good	22.77μg/m³ Good	28.59ppb Good	0.33ppb Good	3.33ppb Good	0.02ppm Good
Potters Bar, Hertfordshire	27 Good	4.98μg/m³ Good	9.07μg/m³ Good	29.28ppb Good	0.33ppb Good	5.14ppb Good	0.01ppm Good
Rickmansworth, Hertfordshire	33 Good	5.71μg/m³ Good	15.33μg/m³ Good	31.34ppb Good	0.33ppb Good	4.90ppb Good	0.01ppm Good
Royston, Hertfordshire	33 Good	5.57μg/m³ Good	17.81μg/m³ Good	30.20ppb Good	0.33ppb Good	3.44ppb Good	0.03ppm Good
Sawbridgeworth, Hertfordshire	27 Good	4.26μg/m³ Good	22.15μg/m³ Good	29.06ppb Good	0.34ppb Good	3.67ppb Good	0.02ppm Good
St Albans, Hertfordshire	33 Good	6.08μg/m³ Good	12.10μg/m³ Good	27.95ppb Good	0.34ppb Good	5.30ppb Good	0.01ppm Good
Stevenage, Hertfordshire	27 Good	4.67μg/m³ Good	22.77μg/m³ Good	28.59ppb Good	0.33ppb Good	3.33ppb Good	0.02ppm Good
Tring, Hertfordshire	33 Good	5.55μg/m³ Good	12.63μg/m³ Good	31.47ppb Good	0.33ppb Good	2.92ppb Good	0.02ppm Good
Waltham Cross, Hertfordshire	33 Good	5.59μg/m³ Good	11.82μg/m³ Good	29.67ppb Good	0.33ppb Good	4.83ppb Good	0.01ppm Good
Ware, Hertfordshire	33 Good	5.79μg/m³ Good	25.59μg/m³ Good	30.52ppb Good	0.33ppb Good	3.62ppb Good	0.02ppm Good
Watford, Hertfordshire	33 Good	5.50μg/m³ Good	14.65μg/m³ Good	31.23ppb Good	0.33ppb Good	4.60ppb Good	0.01ppm Good
Welwyn Garden City, Hertfordshire	33 Good	5.68μg/m³ Good	18.13μg/m³ Good	30.91ppb Good	0.33ppb Good	3.87ppb Good	0.01ppm Good

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

0.03ppm

How accurate is Hertfordshire, UK air quality data?

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

Source: Ambee Data Sources

Air quality levels in UK

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

View Polluted Cities

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

View Clean Cities

Frequently asked questions

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

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

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

The worst air quality in Hertfordshire, UK in the last 24 hours was observed at 06:00:00 on 2026-03-28.

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 01:00:00 on 2026-03-29.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 28, 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 5.377 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 17.22 μg/m³.

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

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

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.331 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 29.846 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 4.204 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-03-27T21:00:00.000Z	49 \| good	9.295 \| good	23.614 \| good	32.549 \| good	0.544 \| good	9.024 \| good	0.02 \| good
2026-03-27T22:00:00.000Z	29 \| good	4.797 \| good	18.192 \| good	30.588 \| good	0.608 \| good	9.393 \| good	0.019 \| good
2026-03-27T23:00:00.000Z	49 \| good	8.976 \| good	16.388 \| good	23.653 \| good	0.602 \| good	12.868 \| good	0.016 \| good
2026-03-28T00:00:00.000Z	38 \| good	6.515 \| good	24.338 \| good	25.17 \| good	0.47 \| good	7.401 \| good	0.273 \| good
2026-03-28T01:00:00.000Z	49 \| good	8.661 \| good	21.6 \| good	24.505 \| good	0.527 \| good	7.303 \| good	0.23 \| good
2026-03-28T02:00:00.000Z	52 \| moderate	9.81 \| good	20.6 \| good	25.35 \| good	0.433 \| good	6.997 \| good	0.217 \| good
2026-03-28T03:00:00.000Z	49 \| good	8.817 \| good	30.032 \| good	27.93 \| good	0.433 \| good	4 \| good	0.209 \| good
2026-03-28T04:00:00.000Z	44 \| good	7.839 \| good	24.012 \| good	29.464 \| good	0.382 \| good	4.652 \| good	0.203 \| good
2026-03-28T05:00:00.000Z	52 \| moderate	10.114 \| good	13.559 \| good	30.176 \| good	0.382 \| good	4.272 \| good	0.2 \| good
2026-03-28T06:00:00.000Z	38 \| good	7.138 \| good	14.795 \| good	33.666 \| good	0.382 \| good	4.364 \| good	0.198 \| good
2026-03-28T07:00:00.000Z	38 \| good	6.926 \| good	19.717 \| good	31.486 \| good	0.507 \| good	3.423 \| good	0.011 \| good
2026-03-28T08:00:00.000Z	29 \| good	5.464 \| good	23.884 \| good	31.106 \| good	0.421 \| good	6.14 \| good	0.013 \| good
2026-03-28T09:00:00.000Z	33 \| good	6.342 \| good	20.576 \| good	29.23 \| good	0.491 \| good	5.214 \| good	0.014 \| good
2026-03-28T10:00:00.000Z	33 \| good	6.052 \| good	24.796 \| good	32.509 \| good	0.423 \| good	6.676 \| good	0.015 \| good
2026-03-28T11:00:00.000Z	44 \| good	8.045 \| good	18.661 \| good	30.605 \| good	0.351 \| good	6.803 \| good	0.015 \| good
2026-03-28T12:00:00.000Z	44 \| good	7.652 \| good	12.692 \| good	32.57 \| good	0.423 \| good	5.717 \| good	0.015 \| good
2026-03-28T13:00:00.000Z	44 \| good	7.901 \| good	26 \| good	31.02 \| good	0.351 \| good	7.241 \| good	0.015 \| good
2026-03-28T14:00:00.000Z	49 \| good	9.005 \| good	23.2 \| good	33.124 \| good	0.351 \| good	6.492 \| good	0.014 \| good
2026-03-28T15:00:00.000Z	44 \| good	8.122 \| good	19.866 \| good	29.624 \| good	0.351 \| good	7.685 \| good	0.017 \| good
2026-03-28T16:00:00.000Z	38 \| good	7.448 \| good	22.23 \| good	36.952 \| good	0.425 \| good	7.287 \| good	0.015 \| good
2026-03-28T17:00:00.000Z	35 \| good	6.25 \| good	23.158 \| good	37.831 \| good	0.424 \| good	7.252 \| good	0.015 \| good
2026-03-28T18:00:00.000Z	52 \| moderate	10.105 \| good	22.183 \| good	37.487 \| good	0.351 \| good	5.163 \| good	0.015 \| good
2026-03-28T19:00:00.000Z	44 \| good	8.293 \| good	19.01 \| good	38.109 \| good	0.419 \| good	4.951 \| good	0.017 \| good
2026-03-28T20:00:00.000Z	38 \| good	7.318 \| good	18.226 \| good	36.993 \| good	0.35 \| good	7.659 \| good	0.017 \| good
2026-03-28T21:00:00.000Z	49 \| good	8.639 \| good	32.644 \| good	37.708 \| good	0.35 \| good	8.121 \| good	0.016 \| good
2026-03-28T22:00:00.000Z	34 \| good	6.295 \| good	26.386 \| good	37.028 \| good	0.351 \| good	4.776 \| good	0.016 \| good
2026-03-28T23:00:00.000Z	33 \| good	5.915 \| good	22.259 \| good	36.272 \| good	0.351 \| good	8.846 \| good	0.016 \| good
2026-03-29T00:00:00.000Z	35 \| good	6.264 \| good	15.029 \| good	37.603 \| good	0.482 \| good	9.008 \| good	0.266 \| good
2026-03-29T01:00:00.000Z	38 \| good	6.62 \| good	13.966 \| good	35.67 \| good	0.382 \| good	8.569 \| good	0.264 \| good
2026-03-29T02:00:00.000Z	31 \| good	4.684 \| good	13.433 \| good	32.54 \| good	0.382 \| good	6.79 \| good	0.247 \| good
2026-03-29T03:00:00.000Z	29 \| good	4.467 \| good	13.389 \| good	30.545 \| good	0.382 \| good	4.758 \| good	0.299 \| good
2026-03-29T04:00:00.000Z	29 \| good	5.486 \| good	13.112 \| good	30.712 \| good	0.382 \| good	3.119 \| good	0.285 \| good
2026-03-29T05:00:00.000Z	27 \| good	4.743 \| good	14.496 \| good	25.928 \| good	0.329 \| good	3.618 \| good	0.015 \| good
2026-03-29T06:00:00.000Z	33 \| good	5.52 \| good	14.339 \| good	27.121 \| good	0.331 \| good	3.614 \| good	0.015 \| good
2026-03-29T07:00:00.000Z	27 \| good	4.98 \| good	15.198 \| good	27.072 \| good	0.472 \| good	4.36 \| good	0.015 \| good
2026-03-29T08:00:00.000Z	33 \| good	5.664 \| good	18.62 \| good	27.229 \| good	0.516 \| good	6.004 \| good	0.016 \| good
2026-03-29T09:00:00.000Z	27 \| good	5.308 \| good	17.885 \| good	25.881 \| good	0.565 \| good	7.862 \| good	0.018 \| good
2026-03-29T10:00:00.000Z	27 \| good	4.548 \| good	18.572 \| good	25.93 \| good	0.399 \| good	5.092 \| good	0.017 \| good
2026-03-29T11:00:00.000Z	27 \| good	5.453 \| good	14.922 \| good	23.852 \| good	0.402 \| good	6.245 \| good	0.014 \| good
2026-03-29T12:00:00.000Z	33 \| good	5.883 \| good	13.643 \| good	24.923 \| good	0.329 \| good	4.805 \| good	0.013 \| good
2026-03-29T13:00:00.000Z	27 \| good	5.453 \| good	22.359 \| good	24.508 \| good	0.329 \| good	3.758 \| good	0.015 \| good
2026-03-29T14:00:00.000Z	33 \| good	5.537 \| good	23.427 \| good	28.313 \| good	0.41 \| good	4.795 \| good	0.014 \| good
2026-03-29T15:00:00.000Z	33 \| good	5.678 \| good	18.133 \| good	30.912 \| good	0.329 \| good	3.865 \| good	0.015 \| good
2026-03-29T16:00:00.000Z	33 \| good	5.543 \| good	18.824 \| good	31 \| good	0.329 \| good	2.865 \| good	0.015 \| good
2026-03-29T17:00:00.000Z	33 \| good	5.56 \| good	15.015 \| good	33.066 \| good	0.329 \| good	2.381 \| good	0.015 \| good
2026-03-29T18:00:00.000Z	32 \| good	5.328 \| good	15.143 \| good	34.652 \| good	0.329 \| good	3.912 \| good	0.014 \| good
2026-03-29T19:00:00.000Z	34 \| good	5.255 \| good	18.583 \| good	37.345 \| good	0.329 \| good	3.232 \| good	0.016 \| good
2026-03-29T20:00:00.000Z	35 \| good	4.499 \| good	13.419 \| good	37.83 \| good	0.402 \| good	2.707 \| good	0.021 \| good
2026-03-29T20:00:00.000Z	32 \| good	4.765 \| good	14.378 \| good	35.469 \| good	0.416 \| good	3.66 \| good	0.02 \| good
2026-03-29T16:00:00.000Z	42 \| good	4.128 \| good	7.792 \| good	44.766 \| good	0.113 \| good	2.153 \| good	0.143 \| good
2026-03-29T17:00:00.000Z	42 \| good	4.541 \| good	7.976 \| good	44.596 \| good	0.115 \| good	2.362 \| good	0.143 \| good
2026-03-29T18:00:00.000Z	41 \| good	4.846 \| good	6.825 \| good	44.094 \| good	0.179 \| good	2.801 \| good	0.14 \| good
2026-03-29T19:00:00.000Z	41 \| good	4.283 \| good	6.23 \| good	43.543 \| good	0.203 \| good	3.032 \| good	0.135 \| good
2026-03-29T20:00:00.000Z	40 \| good	4.654 \| good	6.632 \| good	42.985 \| good	0.213 \| good	2.945 \| good	0.132 \| good
2026-03-29T21:00:00.000Z	39 \| good	4.844 \| good	7.44 \| good	41.853 \| good	0.234 \| good	2.839 \| good	0.129 \| good
2026-03-29T22:00:00.000Z	38 \| good	5.046 \| good	8.365 \| good	40.992 \| good	0.221 \| good	2.662 \| good	0.126 \| good
2026-03-29T23:00:00.000Z	37 \| good	5.308 \| good	9.102 \| good	40.228 \| good	0.209 \| good	2.223 \| good	0.123 \| good
2026-03-30T00:00:00.000Z	37 \| good	5.386 \| good	9.805 \| good	39.736 \| good	0.214 \| good	2.095 \| good	0.119 \| good
2026-03-30T01:00:00.000Z	35 \| good	5.105 \| good	10.311 \| good	37.561 \| good	0.226 \| good	1.933 \| good	0.117 \| good
2026-03-30T02:00:00.000Z	34 \| good	4.979 \| good	10.825 \| good	37.212 \| good	0.227 \| good	1.706 \| good	0.116 \| good
2026-03-30T03:00:00.000Z	34 \| good	5.071 \| good	11.69 \| good	36.969 \| good	0.232 \| good	1.554 \| good	0.116 \| good
2026-03-30T04:00:00.000Z	34 \| good	5.275 \| good	12.983 \| good	37.471 \| good	0.237 \| good	1.427 \| good	0.115 \| good
2026-03-30T05:00:00.000Z	35 \| good	5.516 \| good	13.028 \| good	37.781 \| good	0.234 \| good	1.769 \| good	0.115 \| good
2026-03-30T06:00:00.000Z	34 \| good	5.932 \| good	13.914 \| good	37.401 \| good	0.24 \| good	2.614 \| good	0.116 \| good
2026-03-30T07:00:00.000Z	35 \| good	6.203 \| good	14.96 \| good	37.94 \| good	0.257 \| good	3.186 \| good	0.119 \| good
2026-03-30T08:00:00.000Z	38 \| good	6.188 \| good	12.418 \| good	40.949 \| good	0.311 \| good	3.058 \| good	0.119 \| good
2026-03-30T09:00:00.000Z	39 \| good	5.216 \| good	12.319 \| good	41.763 \| good	0.23 \| good	2.518 \| good	0.118 \| good
2026-03-30T10:00:00.000Z	40 \| good	5.202 \| good	13.848 \| good	43.466 \| good	0.209 \| good	2.15 \| good	0.12 \| good
2026-03-30T11:00:00.000Z	42 \| good	5.308 \| good	12.332 \| good	45.053 \| good	0.209 \| good	2.101 \| good	0.12 \| good
2026-03-30T12:00:00.000Z	43 \| good	5.031 \| good	11.922 \| good	46.093 \| good	0.208 \| good	1.994 \| good	0.121 \| good
2026-03-30T13:00:00.000Z	45 \| good	4.748 \| good	11.465 \| good	48.817 \| good	0.205 \| good	1.793 \| good	0.123 \| good
2026-03-30T14:00:00.000Z	47 \| good	4.532 \| good	10.485 \| good	51.22 \| good	0.204 \| good	1.602 \| good	0.123 \| good
2026-03-30T15:00:00.000Z	48 \| good	4.448 \| good	10.175 \| good	51.71 \| good	0.209 \| good	1.724 \| good	0.122 \| good
2026-03-30T16:00:00.000Z	48 \| good	4.554 \| good	10.251 \| good	51.529 \| good	0.222 \| good	2.057 \| good	0.124 \| good
2026-03-30T17:00:00.000Z	46 \| good	4.639 \| good	10.318 \| good	49.999 \| good	0.234 \| good	2.579 \| good	0.127 \| good
2026-03-30T18:00:00.000Z	44 \| good	4.852 \| good	10.223 \| good	47.371 \| good	0.283 \| good	3.699 \| good	0.132 \| good
2026-03-30T19:00:00.000Z	40 \| good	5.529 \| good	10.149 \| good	43.266 \| good	0.359 \| good	4.465 \| good	0.133 \| good
2026-03-30T20:00:00.000Z	38 \| good	6.12 \| good	10.639 \| good	41.001 \| good	0.421 \| good	4.794 \| good	0.134 \| good
2026-03-30T21:00:00.000Z	38 \| good	6.632 \| good	10.894 \| good	41.447 \| good	0.377 \| good	4.49 \| good	0.134 \| good
2026-03-30T22:00:00.000Z	38 \| good	7.362 \| good	10.944 \| good	39.85 \| good	0.384 \| good	4.629 \| good	0.135 \| good
2026-03-30T23:00:00.000Z	44 \| good	7.542 \| good	11.738 \| good	37.177 \| good	0.409 \| good	4.836 \| good	0.136 \| good
2026-03-31T00:00:00.000Z	44 \| good	7.613 \| good	12.948 \| good	34.546 \| good	0.407 \| good	5.123 \| good	0.136 \| good
2026-03-31T01:00:00.000Z	44 \| good	7.976 \| good	13.793 \| good	32.633 \| good	0.383 \| good	4.785 \| good	0.136 \| good
2026-03-31T02:00:00.000Z	49 \| good	8.505 \| good	14.322 \| good	31.523 \| good	0.385 \| good	4.256 \| good	0.135 \| good
2026-03-31T03:00:00.000Z	49 \| good	8.63 \| good	14.549 \| good	31.284 \| good	0.347 \| good	3.87 \| good	0.134 \| good
2026-03-31T04:00:00.000Z	49 \| good	8.591 \| good	13.969 \| good	31.197 \| good	0.273 \| good	3.817 \| good	0.133 \| good
2026-03-31T05:00:00.000Z	44 \| good	8.059 \| good	14.271 \| good	29.379 \| good	0.29 \| good	4.142 \| good	0.132 \| good
2026-03-31T06:00:00.000Z	44 \| good	7.845 \| good	14.473 \| good	28.073 \| good	0.401 \| good	5.479 \| good	0.136 \| good
2026-03-31T07:00:00.000Z	44 \| good	7.849 \| good	14.714 \| good	26.431 \| good	0.433 \| good	6.765 \| good	0.14 \| good
2026-03-31T08:00:00.000Z	38 \| good	6.867 \| good	13.503 \| good	26.411 \| good	0.531 \| good	7.907 \| good	0.144 \| good
2026-03-31T09:00:00.000Z	33 \| good	6.478 \| good	10.672 \| good	26.031 \| good	0.431 \| good	7.451 \| good	0.14 \| good
2026-03-31T10:00:00.000Z	33 \| good	6.172 \| good	9.077 \| good	26.388 \| good	0.305 \| good	5.584 \| good	0.135 \| good
2026-03-31T11:00:00.000Z	27 \| good	5.407 \| good	8.161 \| good	28.045 \| good	0.27 \| good	4.208 \| good	0.129 \| good
2026-03-31T12:00:00.000Z	27 \| good	5.229 \| good	7.037 \| good	29.322 \| good	0.216 \| good	4.076 \| good	0.126 \| good
2026-03-31T13:00:00.000Z	28 \| good	4.811 \| good	7.112 \| good	30.29 \| good	0.232 \| good	3.774 \| good	0.126 \| good
2026-03-31T14:00:00.000Z	29 \| good	4.912 \| good	7.304 \| good	30.587 \| good	0.237 \| good	4.497 \| good	0.128 \| good
2026-03-31T15:00:00.000Z	29 \| good	4.936 \| good	7.118 \| good	30.765 \| good	0.223 \| good	4.727 \| good	0.129 \| good

Hertfordshire, UK live air quality index now

Major air pollutants in Hertfordshire, UK

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Hertfordshire, UK air quality forecast and history

Get reliable air quality data to drive your business

Hertfordshire, UK air quality map: Track AQI near you

Air quality in cities of Hertfordshire, UK

Air quality in nearby states

Central Bedfordshire, UK

Greater London, UK

Halton, UK

Buckinghamshire, UK

Bedford, UK

Milton Keynes, UK

How accurate is Hertfordshire, UK air quality data?

Air quality levels in UK

Frequently asked questions

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

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

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

What is the current air quality in Hertfordshire, UK?

What pollutant is the most common in Hertfordshire, UK?

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

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

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

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

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

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

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

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

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

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

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

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

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