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

The current PM10 concentration at Hertfordshire, UK is 12.199 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.631 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 29.529 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 7.999 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 3.509 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)

4.43 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

12.00 μg/m³

155

255

425

605+

Ozone (O₃)

30.05 ppb

201

201+

Sulfur Dioxide (SO₂)

0.57 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

6.50 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.31 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
2026-09-26T23:00:00.000Z	27 \| good	4.526 \| good	14.3 \| good	23.382 \| good	0.637 \| good	15.634 \| good	0.297 \| good
2026-09-27T00:00:00.000Z	33 \| good	5.96 \| good	15.24 \| good	19.12 \| good	0.663 \| good	19.859 \| good	0.226 \| good
2026-09-27T01:00:00.000Z	44 \| good	8.167 \| good	15.24 \| good	19.13 \| good	0.715 \| good	19.336 \| good	0.229 \| good
2026-09-27T02:00:00.000Z	38 \| good	7.38 \| good	14.697 \| good	18.779 \| good	0.582 \| good	17.989 \| good	0.212 \| good
2026-09-27T03:00:00.000Z	38 \| good	6.605 \| good	18.818 \| good	18.333 \| good	0.667 \| good	12.756 \| good	0.217 \| good
2026-09-27T04:00:00.000Z	33 \| good	6.436 \| good	22.949 \| good	14.592 \| good	0.572 \| good	15.523 \| good	0.205 \| good
2026-09-27T05:00:00.000Z	33 \| good	5.771 \| good	18.117 \| good	14.49 \| good	0.665 \| good	16.131 \| good	0.01 \| good
2026-09-27T06:00:00.000Z	52 \| moderate	9.906 \| good	16.297 \| good	18.079 \| good	0.594 \| good	14.957 \| good	0.009 \| good
2026-09-27T07:00:00.000Z	33 \| good	6.142 \| good	19.148 \| good	16.459 \| good	0.593 \| good	14.316 \| good	0.009 \| good
2026-09-27T08:00:00.000Z	49 \| good	9.32 \| good	26.4 \| good	23.98 \| good	0.59 \| good	11.518 \| good	0.01 \| good
2026-09-27T09:00:00.000Z	49 \| good	9.177 \| good	21.22 \| good	16.969 \| good	0.516 \| good	12.445 \| good	0.009 \| good
2026-09-27T10:00:00.000Z	33 \| good	6.072 \| good	17.793 \| good	19.556 \| good	0.517 \| good	9.308 \| good	0.011 \| good
2026-09-27T11:00:00.000Z	52 \| moderate	9.688 \| good	18.324 \| good	24.036 \| good	0.665 \| good	14.046 \| good	0.009 \| good
2026-09-27T12:00:00.000Z	49 \| good	9.252 \| good	19.229 \| good	17.767 \| good	0.739 \| good	13.307 \| good	0.009 \| good
2026-09-27T13:00:00.000Z	49 \| good	8.565 \| good	26.78 \| good	27.336 \| good	0.739 \| good	11.319 \| good	0.008 \| good
2026-09-27T14:00:00.000Z	38 \| good	7.445 \| good	21.148 \| good	28.75 \| good	0.739 \| good	8.286 \| good	0.008 \| good
2026-09-27T15:00:00.000Z	54 \| moderate	11.228 \| good	27.779 \| good	23.729 \| good	0.739 \| good	7.616 \| good	0.009 \| good
2026-09-27T16:00:00.000Z	49 \| good	9.35 \| good	20.519 \| good	32.83 \| good	0.665 \| good	6.756 \| good	0.009 \| good
2026-09-27T17:00:00.000Z	56 \| moderate	12.441 \| fine	18.86 \| good	34.736 \| good	0.739 \| good	7.555 \| good	0.009 \| good
2026-09-27T18:00:00.000Z	58 \| moderate	12.642 \| fine	21.105 \| good	26.867 \| good	0.665 \| good	6.377 \| good	0.01 \| good
2026-09-27T19:00:00.000Z	52 \| moderate	9.759 \| good	23.962 \| good	27.173 \| good	0.665 \| good	8.034 \| good	0.012 \| good
2026-09-27T20:00:00.000Z	56 \| moderate	12.317 \| fine	23.806 \| good	35.188 \| good	0.592 \| good	13.254 \| good	0.014 \| good
2026-09-27T21:00:00.000Z	54 \| moderate	11.16 \| good	21.98 \| good	33.962 \| good	0.594 \| good	8.866 \| good	0.017 \| good
2026-09-27T22:00:00.000Z	38 \| good	7.242 \| good	23.104 \| good	31.042 \| good	0.51 \| good	7.257 \| good	0.014 \| good
2026-09-27T23:00:00.000Z	38 \| good	6.715 \| good	21.225 \| good	34.132 \| good	0.592 \| good	6.419 \| good	0.015 \| good
2026-09-28T00:00:00.000Z	33 \| good	6.225 \| good	20.349 \| good	30.936 \| good	0.667 \| good	5.355 \| good	0.255 \| good
2026-09-28T01:00:00.000Z	33 \| good	5.995 \| good	23.172 \| good	27.927 \| good	0.72 \| good	5.656 \| good	0.18 \| good
2026-09-28T02:00:00.000Z	38 \| good	6.917 \| good	21.66 \| good	24.433 \| good	0.579 \| good	5.386 \| good	0.226 \| good
2026-09-28T03:00:00.000Z	33 \| good	6.031 \| good	16.471 \| good	26.826 \| good	0.723 \| good	5.928 \| good	0.214 \| good
2026-09-28T04:00:00.000Z	33 \| good	6.32 \| good	17.855 \| good	25.803 \| good	0.722 \| good	7.147 \| good	0.218 \| good
2026-09-28T05:00:00.000Z	33 \| good	6.326 \| good	14.928 \| good	28.652 \| good	0.593 \| good	8.457 \| good	0.197 \| good
2026-09-28T06:00:00.000Z	38 \| good	6.532 \| good	13.208 \| good	22.043 \| good	0.596 \| good	6.399 \| good	0.21 \| good
2026-09-28T07:00:00.000Z	33 \| good	5.522 \| good	13.673 \| good	12.901 \| good	0.595 \| good	12.746 \| good	0.279 \| good
2026-09-28T08:00:00.000Z	27 \| good	5.027 \| good	12.053 \| good	25.805 \| good	0.592 \| good	12.408 \| good	0.264 \| good
2026-09-28T09:00:00.000Z	33 \| good	5.539 \| good	11.577 \| good	14.316 \| good	0.667 \| good	11.701 \| good	0.235 \| good
2026-09-28T10:00:00.000Z	27 \| good	5.18 \| good	8.007 \| good	21.653 \| good	0.666 \| good	9.006 \| good	0.221 \| good
2026-09-28T11:00:00.000Z	22 \| good	3.609 \| good	14.704 \| good	17.687 \| good	0.737 \| good	8.496 \| good	0.212 \| good
2026-09-28T12:00:00.000Z	27 \| good	4.864 \| good	12.013 \| good	17.953 \| good	0.739 \| good	8.553 \| good	0.188 \| good
2026-09-28T13:00:00.000Z	27 \| good	4.871 \| good	11.03 \| good	22.134 \| good	0.586 \| good	7.726 \| good	0.165 \| good
2026-09-28T14:00:00.000Z	22 \| good	4.257 \| good	10.173 \| good	19.895 \| good	0.511 \| good	4.548 \| good	0.162 \| good
2026-09-28T15:00:00.000Z	27 \| good	4.689 \| good	7.55 \| good	20.031 \| good	0.59 \| good	4.984 \| good	0.156 \| good
2026-09-28T16:00:00.000Z	27 \| good	5.153 \| good	9.208 \| good	24.158 \| good	0.738 \| good	5.446 \| good	0.153 \| good
2026-09-28T17:00:00.000Z	24 \| good	3.373 \| good	7.393 \| good	26.293 \| good	0.888 \| good	5.478 \| good	0.169 \| good
2026-09-28T18:00:00.000Z	27 \| good	2.66 \| good	11.226 \| good	28.778 \| good	0.743 \| good	6.798 \| good	0.216 \| good
2026-09-28T19:00:00.000Z	29 \| good	2.767 \| good	12.916 \| good	30.506 \| good	0.664 \| good	9.96 \| good	0.253 \| good
2026-09-28T20:00:00.000Z	29 \| good	4.264 \| good	11.922 \| good	31.303 \| good	0.589 \| good	8.209 \| good	0.324 \| good
2026-09-28T21:00:00.000Z	31 \| good	4.247 \| good	14.08 \| good	32.6 \| good	0.592 \| good	5.354 \| good	0.312 \| good
2026-09-28T22:00:00.000Z	28 \| good	4.427 \| good	11.997 \| good	30.048 \| good	0.566 \| good	6.502 \| good	0.312 \| good
2026-09-28T21:00:00.000Z	27 \| good	5.442 \| good	9.399 \| good	21.293 \| good	0.357 \| good	6.984 \| good	0.151 \| good
2026-09-28T22:00:00.000Z	27 \| good	5.122 \| good	8.588 \| good	22.093 \| good	0.292 \| good	5.771 \| good	0.147 \| good
2026-09-28T23:00:00.000Z	22 \| good	4.456 \| good	8.269 \| good	23.57 \| good	0.225 \| good	4.177 \| good	0.139 \| good
2026-09-29T00:00:00.000Z	24 \| good	4.056 \| good	7.03 \| good	26.494 \| good	0.167 \| good	3.371 \| good	0.132 \| good
2026-09-29T01:00:00.000Z	25 \| good	3.801 \| good	6.555 \| good	26.62 \| good	0.139 \| good	2.928 \| good	0.126 \| good
2026-09-29T02:00:00.000Z	25 \| good	3.772 \| good	6.54 \| good	26.568 \| good	0.131 \| good	2.641 \| good	0.123 \| good
2026-09-29T03:00:00.000Z	24 \| good	3.737 \| good	7.241 \| good	26.316 \| good	0.128 \| good	2.54 \| good	0.121 \| good
2026-09-29T04:00:00.000Z	25 \| good	3.791 \| good	6.828 \| good	26.563 \| good	0.13 \| good	2.673 \| good	0.121 \| good
2026-09-29T05:00:00.000Z	24 \| good	4.224 \| good	7.115 \| good	26.35 \| good	0.137 \| good	2.871 \| good	0.121 \| good
2026-09-29T06:00:00.000Z	23 \| good	4.136 \| good	6.565 \| good	24.8 \| good	0.163 \| good	3.881 \| good	0.125 \| good
2026-09-29T07:00:00.000Z	22 \| good	4.453 \| good	7.358 \| good	20.489 \| good	0.237 \| good	5.759 \| good	0.135 \| good
2026-09-29T08:00:00.000Z	27 \| good	4.852 \| good	7.247 \| good	21.324 \| good	0.291 \| good	6.298 \| good	0.145 \| good
2026-09-29T09:00:00.000Z	27 \| good	4.947 \| good	7.967 \| good	23.595 \| good	0.319 \| good	5.592 \| good	0.147 \| good
2026-09-29T10:00:00.000Z	38 \| good	6.659 \| good	9.464 \| good	27.007 \| good	0.313 \| good	4.89 \| good	0.147 \| good
2026-09-29T11:00:00.000Z	38 \| good	7.274 \| good	10.713 \| good	30.458 \| good	0.34 \| good	4.101 \| good	0.151 \| good
2026-09-29T12:00:00.000Z	44 \| good	8.314 \| good	11.962 \| good	33.851 \| good	0.405 \| good	4.225 \| good	0.149 \| good
2026-09-29T13:00:00.000Z	49 \| good	9.282 \| good	13.251 \| good	37.08 \| good	0.431 \| good	4.087 \| good	0.155 \| good
2026-09-29T14:00:00.000Z	54 \| moderate	10.738 \| good	15.425 \| good	38.766 \| good	0.509 \| good	4.115 \| good	0.16 \| good
2026-09-29T15:00:00.000Z	54 \| moderate	10.924 \| good	14.967 \| good	39.582 \| good	0.519 \| good	4.359 \| good	0.162 \| good
2026-09-29T16:00:00.000Z	49 \| good	9.347 \| good	13.297 \| good	38.446 \| good	0.48 \| good	4.977 \| good	0.158 \| good
2026-09-29T17:00:00.000Z	58 \| moderate	12.957 \| fine	15.428 \| good	36.104 \| good	0.495 \| good	6.463 \| good	0.164 \| good
2026-09-29T18:00:00.000Z	60 \| moderate	14.459 \| fine	16.373 \| good	33.445 \| good	0.546 \| good	8.121 \| good	0.173 \| good
2026-09-29T19:00:00.000Z	64 \| moderate	16.434 \| fine	19.86 \| good	30.519 \| good	0.612 \| good	9.149 \| good	0.186 \| good
2026-09-29T20:00:00.000Z	67 \| moderate	17.651 \| fine	21.113 \| good	29.784 \| good	0.677 \| good	8.848 \| good	0.189 \| good
2026-09-29T21:00:00.000Z	64 \| moderate	16.45 \| fine	20.343 \| good	27.367 \| good	0.572 \| good	8.558 \| good	0.175 \| good
2026-09-29T22:00:00.000Z	60 \| moderate	13.573 \| fine	17.514 \| good	25.309 \| good	0.421 \| good	7.284 \| good	0.163 \| good
2026-09-29T23:00:00.000Z	52 \| moderate	10.196 \| good	14.256 \| good	27.884 \| good	0.378 \| good	6.378 \| good	0.152 \| good
2026-09-30T00:00:00.000Z	44 \| good	7.763 \| good	10.546 \| good	33.142 \| good	0.353 \| good	5.629 \| good	0.145 \| good
2026-09-30T01:00:00.000Z	33 \| good	6.274 \| good	10.223 \| good	32.346 \| good	0.307 \| good	4.923 \| good	0.139 \| good
2026-09-30T02:00:00.000Z	29 \| good	5.224 \| good	8.952 \| good	31.296 \| good	0.298 \| good	4.312 \| good	0.13 \| good
2026-09-30T03:00:00.000Z	30 \| good	4.568 \| good	8.908 \| good	31.505 \| good	0.31 \| good	3.615 \| good	0.127 \| good
2026-09-30T04:00:00.000Z	30 \| good	4.555 \| good	10.181 \| good	31.642 \| good	0.326 \| good	3.316 \| good	0.127 \| good
2026-09-30T05:00:00.000Z	29 \| good	4.8 \| good	10.885 \| good	31.375 \| good	0.306 \| good	3.301 \| good	0.126 \| good
2026-09-30T06:00:00.000Z	30 \| good	5.351 \| good	11.23 \| good	31.667 \| good	0.264 \| good	3.915 \| good	0.127 \| good
2026-09-30T07:00:00.000Z	33 \| good	5.987 \| good	10.944 \| good	29.889 \| good	0.275 \| good	5.801 \| good	0.131 \| good
2026-09-30T08:00:00.000Z	33 \| good	5.661 \| good	8.856 \| good	27.379 \| good	0.288 \| good	7.204 \| good	0.133 \| good
2026-09-30T09:00:00.000Z	27 \| good	4.707 \| good	7.546 \| good	26.871 \| good	0.259 \| good	7.637 \| good	0.134 \| good
2026-09-30T10:00:00.000Z	27 \| good	5.002 \| good	6.781 \| good	29.202 \| good	0.203 \| good	6.157 \| good	0.129 \| good
2026-09-30T11:00:00.000Z	33 \| good	5.587 \| good	6.922 \| good	31.487 \| good	0.182 \| good	3.824 \| good	0.119 \| good
2026-09-30T12:00:00.000Z	30 \| good	5.117 \| good	7.151 \| good	32.04 \| good	0.156 \| good	2.922 \| good	0.113 \| good
2026-09-30T13:00:00.000Z	31 \| good	4.782 \| good	7.067 \| good	33.49 \| good	0.134 \| good	2.608 \| good	0.113 \| good
2026-09-30T14:00:00.000Z	32 \| good	4.076 \| good	7.041 \| good	35.247 \| good	0.124 \| good	2.343 \| good	0.113 \| good
2026-09-30T15:00:00.000Z	31 \| good	3.974 \| good	7.652 \| good	34.252 \| good	0.131 \| good	2.843 \| good	0.114 \| good
2026-09-30T16:00:00.000Z	31 \| good	4.313 \| good	7.932 \| good	32.906 \| good	0.151 \| good	3.775 \| good	0.116 \| good
2026-09-30T17:00:00.000Z	28 \| good	4.476 \| good	8.442 \| good	30.355 \| good	0.196 \| good	5.73 \| good	0.123 \| good
2026-09-30T18:00:00.000Z	27 \| good	5.305 \| good	9.888 \| good	25.341 \| good	0.279 \| good	9.149 \| good	0.135 \| good
2026-09-30T19:00:00.000Z	33 \| good	6.323 \| good	11.811 \| good	22.21 \| good	0.37 \| good	10.704 \| good	0.137 \| good
2026-09-30T20:00:00.000Z	38 \| good	6.827 \| good	12.343 \| good	21.297 \| good	0.384 \| good	10.833 \| good	0.141 \| 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
Bushey, Hertfordshire	33 Good	5.57μg/m³ Good	11.72μg/m³ Good	31.35ppb Good	0.68ppb Good	8.28ppb Good	0.25ppm Good
Borehamwood, Hertfordshire	29 Good	4.55μg/m³ Good	8.43μg/m³ Good	31.20ppb Good	0.67ppb Good	6.78ppb Good	0.25ppm Good
Hertford, Hertfordshire	29 Good	3.25μg/m³ Good	11.84μg/m³ Good	30.56ppb Good	0.66ppb Good	10.72ppb Good	0.25ppm Good
Hatfield, Hertfordshire	28 Good	3.50μg/m³ Good	11.08μg/m³ Good	30.21ppb Good	0.66ppb Good	10.53ppb Good	0.25ppm Good
Baldock, Hertfordshire	29 Good	2.97μg/m³ Good	13.01μg/m³ Good	30.57ppb Good	0.58ppb Good	8.62ppb Good	0.25ppm Good
Stevenage, Hertfordshire	28 Good	2.81μg/m³ Good	14.43μg/m³ Good	30.39ppb Good	0.59ppb Good	10.12ppb Good	0.25ppm Good
Hoddesdon, Hertfordshire	29 Good	3.25μg/m³ Good	11.84μg/m³ Good	30.56ppb Good	0.66ppb Good	10.72ppb Good	0.25ppm Good
Royston, Hertfordshire	28 Good	2.75μg/m³ Good	13.53μg/m³ Good	30.15ppb Good	0.52ppb Good	9.80ppb Good	0.25ppm Good
Hitchin, Hertfordshire	28 Good	2.81μg/m³ Good	14.43μg/m³ Good	30.39ppb Good	0.59ppb Good	10.12ppb Good	0.25ppm Good
Letchworth, Hertfordshire	28 Good	2.81μg/m³ Good	14.43μg/m³ Good	30.39ppb Good	0.59ppb Good	10.12ppb Good	0.25ppm Good
St Albans, Hertfordshire	29 Good	5.13μg/m³ Good	11.94μg/m³ Good	30.72ppb Good	0.67ppb Good	10.95ppb Good	0.25ppm Good
Welwyn Garden City, Hertfordshire	29 Good	2.77μg/m³ Good	12.92μg/m³ Good	30.51ppb Good	0.66ppb Good	9.96ppb Good	0.25ppm Good
Tring, Hertfordshire	28 Good	3.96μg/m³ Good	17.68μg/m³ Good	30.29ppb Good	0.67ppb Good	5.28ppb Good	0.25ppm Good
Bishop's Stortford, Hertfordshire	27 Good	3.20μg/m³ Good	11.83μg/m³ Good	29.50ppb Good	0.52ppb Good	6.06ppb Good	0.25ppm Good
Harpenden, Hertfordshire	27 Good	3.48μg/m³ Good	13.60μg/m³ Good	28.81ppb Good	0.66ppb Good	7.68ppb Good	0.25ppm Good
Sawbridgeworth, Hertfordshire	27 Good	3.20μg/m³ Good	11.83μg/m³ Good	29.50ppb Good	0.52ppb Good	6.06ppb Good	0.25ppm Good
Potters Bar, Hertfordshire	27 Good	4.08μg/m³ Good	9.04μg/m³ Good	29.34ppb Good	0.66ppb Good	6.80ppb Good	0.25ppm Good
Ware, Hertfordshire	28 Good	2.79μg/m³ Good	11.74μg/m³ Good	29.66ppb Good	0.55ppb Good	7.71ppb Good	0.25ppm Good
Cheshunt, Hertfordshire	27 Good	3.42μg/m³ Good	9.57μg/m³ Good	28.54ppb Good	0.66ppb Good	5.87ppb Good	0.25ppm Good
Berkhamsted, Hertfordshire	26 Good	3.97μg/m³ Good	10.91μg/m³ Good	27.68ppb Good	0.67ppb Good	5.02ppb Good	0.25ppm Good
Abbots Langley, Hertfordshire	26 Good	3.72μg/m³ Good	10.71μg/m³ Good	28.10ppb Good	0.66ppb Good	5.24ppb Good	0.25ppm Good
Hemel Hempstead, Hertfordshire	26 Good	3.72μg/m³ Good	10.71μg/m³ Good	28.10ppb Good	0.66ppb Good	5.24ppb Good	0.25ppm Good
Chorleywood, Hertfordshire	26 Good	3.39μg/m³ Good	13.10μg/m³ Good	27.55ppb Good	0.67ppb Good	8.44ppb Good	0.25ppm Good
Rickmansworth, Hertfordshire	26 Good	3.39μg/m³ Good	13.10μg/m³ Good	27.55ppb Good	0.67ppb Good	8.44ppb Good	0.25ppm Good
Waltham Cross, Hertfordshire	27 Good	3.41μg/m³ Good	9.58μg/m³ Good	28.56ppb Good	0.66ppb Good	5.81ppb Good	0.25ppm Good
Watford, Hertfordshire	26 Good	3.34μg/m³ Good	14.20μg/m³ Good	27.55ppb Good	0.66ppb Good	7.58ppb Good	0.25ppm Good

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

0.25ppm

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 08:00:00 on 2026-09-27.

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 02:00:00 on 2026-09-28.

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 3.509 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 12.199 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.253 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.631 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 29.529 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 7.999 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-26T23:00:00.000Z	27 \| good	4.526 \| good	14.3 \| good	23.382 \| good	0.637 \| good	15.634 \| good	0.297 \| good
2026-09-27T00:00:00.000Z	33 \| good	5.96 \| good	15.24 \| good	19.12 \| good	0.663 \| good	19.859 \| good	0.226 \| good
2026-09-27T01:00:00.000Z	44 \| good	8.167 \| good	15.24 \| good	19.13 \| good	0.715 \| good	19.336 \| good	0.229 \| good
2026-09-27T02:00:00.000Z	38 \| good	7.38 \| good	14.697 \| good	18.779 \| good	0.582 \| good	17.989 \| good	0.212 \| good
2026-09-27T03:00:00.000Z	38 \| good	6.605 \| good	18.818 \| good	18.333 \| good	0.667 \| good	12.756 \| good	0.217 \| good
2026-09-27T04:00:00.000Z	33 \| good	6.436 \| good	22.949 \| good	14.592 \| good	0.572 \| good	15.523 \| good	0.205 \| good
2026-09-27T05:00:00.000Z	33 \| good	5.771 \| good	18.117 \| good	14.49 \| good	0.665 \| good	16.131 \| good	0.01 \| good
2026-09-27T06:00:00.000Z	52 \| moderate	9.906 \| good	16.297 \| good	18.079 \| good	0.594 \| good	14.957 \| good	0.009 \| good
2026-09-27T07:00:00.000Z	33 \| good	6.142 \| good	19.148 \| good	16.459 \| good	0.593 \| good	14.316 \| good	0.009 \| good
2026-09-27T08:00:00.000Z	49 \| good	9.32 \| good	26.4 \| good	23.98 \| good	0.59 \| good	11.518 \| good	0.01 \| good
2026-09-27T09:00:00.000Z	49 \| good	9.177 \| good	21.22 \| good	16.969 \| good	0.516 \| good	12.445 \| good	0.009 \| good
2026-09-27T10:00:00.000Z	33 \| good	6.072 \| good	17.793 \| good	19.556 \| good	0.517 \| good	9.308 \| good	0.011 \| good
2026-09-27T11:00:00.000Z	52 \| moderate	9.688 \| good	18.324 \| good	24.036 \| good	0.665 \| good	14.046 \| good	0.009 \| good
2026-09-27T12:00:00.000Z	49 \| good	9.252 \| good	19.229 \| good	17.767 \| good	0.739 \| good	13.307 \| good	0.009 \| good
2026-09-27T13:00:00.000Z	49 \| good	8.565 \| good	26.78 \| good	27.336 \| good	0.739 \| good	11.319 \| good	0.008 \| good
2026-09-27T14:00:00.000Z	38 \| good	7.445 \| good	21.148 \| good	28.75 \| good	0.739 \| good	8.286 \| good	0.008 \| good
2026-09-27T15:00:00.000Z	54 \| moderate	11.228 \| good	27.779 \| good	23.729 \| good	0.739 \| good	7.616 \| good	0.009 \| good
2026-09-27T16:00:00.000Z	49 \| good	9.35 \| good	20.519 \| good	32.83 \| good	0.665 \| good	6.756 \| good	0.009 \| good
2026-09-27T17:00:00.000Z	56 \| moderate	12.441 \| fine	18.86 \| good	34.736 \| good	0.739 \| good	7.555 \| good	0.009 \| good
2026-09-27T18:00:00.000Z	58 \| moderate	12.642 \| fine	21.105 \| good	26.867 \| good	0.665 \| good	6.377 \| good	0.01 \| good
2026-09-27T19:00:00.000Z	52 \| moderate	9.759 \| good	23.962 \| good	27.173 \| good	0.665 \| good	8.034 \| good	0.012 \| good
2026-09-27T20:00:00.000Z	56 \| moderate	12.317 \| fine	23.806 \| good	35.188 \| good	0.592 \| good	13.254 \| good	0.014 \| good
2026-09-27T21:00:00.000Z	54 \| moderate	11.16 \| good	21.98 \| good	33.962 \| good	0.594 \| good	8.866 \| good	0.017 \| good
2026-09-27T22:00:00.000Z	38 \| good	7.242 \| good	23.104 \| good	31.042 \| good	0.51 \| good	7.257 \| good	0.014 \| good
2026-09-27T23:00:00.000Z	38 \| good	6.715 \| good	21.225 \| good	34.132 \| good	0.592 \| good	6.419 \| good	0.015 \| good
2026-09-28T00:00:00.000Z	33 \| good	6.225 \| good	20.349 \| good	30.936 \| good	0.667 \| good	5.355 \| good	0.255 \| good
2026-09-28T01:00:00.000Z	33 \| good	5.995 \| good	23.172 \| good	27.927 \| good	0.72 \| good	5.656 \| good	0.18 \| good
2026-09-28T02:00:00.000Z	38 \| good	6.917 \| good	21.66 \| good	24.433 \| good	0.579 \| good	5.386 \| good	0.226 \| good
2026-09-28T03:00:00.000Z	33 \| good	6.031 \| good	16.471 \| good	26.826 \| good	0.723 \| good	5.928 \| good	0.214 \| good
2026-09-28T04:00:00.000Z	33 \| good	6.32 \| good	17.855 \| good	25.803 \| good	0.722 \| good	7.147 \| good	0.218 \| good
2026-09-28T05:00:00.000Z	33 \| good	6.326 \| good	14.928 \| good	28.652 \| good	0.593 \| good	8.457 \| good	0.197 \| good
2026-09-28T06:00:00.000Z	38 \| good	6.532 \| good	13.208 \| good	22.043 \| good	0.596 \| good	6.399 \| good	0.21 \| good
2026-09-28T07:00:00.000Z	33 \| good	5.522 \| good	13.673 \| good	12.901 \| good	0.595 \| good	12.746 \| good	0.279 \| good
2026-09-28T08:00:00.000Z	27 \| good	5.027 \| good	12.053 \| good	25.805 \| good	0.592 \| good	12.408 \| good	0.264 \| good
2026-09-28T09:00:00.000Z	33 \| good	5.539 \| good	11.577 \| good	14.316 \| good	0.667 \| good	11.701 \| good	0.235 \| good
2026-09-28T10:00:00.000Z	27 \| good	5.18 \| good	8.007 \| good	21.653 \| good	0.666 \| good	9.006 \| good	0.221 \| good
2026-09-28T11:00:00.000Z	22 \| good	3.609 \| good	14.704 \| good	17.687 \| good	0.737 \| good	8.496 \| good	0.212 \| good
2026-09-28T12:00:00.000Z	27 \| good	4.864 \| good	12.013 \| good	17.953 \| good	0.739 \| good	8.553 \| good	0.188 \| good
2026-09-28T13:00:00.000Z	27 \| good	4.871 \| good	11.03 \| good	22.134 \| good	0.586 \| good	7.726 \| good	0.165 \| good
2026-09-28T14:00:00.000Z	22 \| good	4.257 \| good	10.173 \| good	19.895 \| good	0.511 \| good	4.548 \| good	0.162 \| good
2026-09-28T15:00:00.000Z	27 \| good	4.689 \| good	7.55 \| good	20.031 \| good	0.59 \| good	4.984 \| good	0.156 \| good
2026-09-28T16:00:00.000Z	27 \| good	5.153 \| good	9.208 \| good	24.158 \| good	0.738 \| good	5.446 \| good	0.153 \| good
2026-09-28T17:00:00.000Z	24 \| good	3.373 \| good	7.393 \| good	26.293 \| good	0.888 \| good	5.478 \| good	0.169 \| good
2026-09-28T18:00:00.000Z	27 \| good	2.66 \| good	11.226 \| good	28.778 \| good	0.743 \| good	6.798 \| good	0.216 \| good
2026-09-28T19:00:00.000Z	29 \| good	2.767 \| good	12.916 \| good	30.506 \| good	0.664 \| good	9.96 \| good	0.253 \| good
2026-09-28T20:00:00.000Z	29 \| good	4.264 \| good	11.922 \| good	31.303 \| good	0.589 \| good	8.209 \| good	0.324 \| good
2026-09-28T21:00:00.000Z	31 \| good	4.247 \| good	14.08 \| good	32.6 \| good	0.592 \| good	5.354 \| good	0.312 \| good
2026-09-28T22:00:00.000Z	28 \| good	4.427 \| good	11.997 \| good	30.048 \| good	0.566 \| good	6.502 \| good	0.312 \| good
2026-09-28T21:00:00.000Z	27 \| good	5.442 \| good	9.399 \| good	21.293 \| good	0.357 \| good	6.984 \| good	0.151 \| good
2026-09-28T22:00:00.000Z	27 \| good	5.122 \| good	8.588 \| good	22.093 \| good	0.292 \| good	5.771 \| good	0.147 \| good
2026-09-28T23:00:00.000Z	22 \| good	4.456 \| good	8.269 \| good	23.57 \| good	0.225 \| good	4.177 \| good	0.139 \| good
2026-09-29T00:00:00.000Z	24 \| good	4.056 \| good	7.03 \| good	26.494 \| good	0.167 \| good	3.371 \| good	0.132 \| good
2026-09-29T01:00:00.000Z	25 \| good	3.801 \| good	6.555 \| good	26.62 \| good	0.139 \| good	2.928 \| good	0.126 \| good
2026-09-29T02:00:00.000Z	25 \| good	3.772 \| good	6.54 \| good	26.568 \| good	0.131 \| good	2.641 \| good	0.123 \| good
2026-09-29T03:00:00.000Z	24 \| good	3.737 \| good	7.241 \| good	26.316 \| good	0.128 \| good	2.54 \| good	0.121 \| good
2026-09-29T04:00:00.000Z	25 \| good	3.791 \| good	6.828 \| good	26.563 \| good	0.13 \| good	2.673 \| good	0.121 \| good
2026-09-29T05:00:00.000Z	24 \| good	4.224 \| good	7.115 \| good	26.35 \| good	0.137 \| good	2.871 \| good	0.121 \| good
2026-09-29T06:00:00.000Z	23 \| good	4.136 \| good	6.565 \| good	24.8 \| good	0.163 \| good	3.881 \| good	0.125 \| good
2026-09-29T07:00:00.000Z	22 \| good	4.453 \| good	7.358 \| good	20.489 \| good	0.237 \| good	5.759 \| good	0.135 \| good
2026-09-29T08:00:00.000Z	27 \| good	4.852 \| good	7.247 \| good	21.324 \| good	0.291 \| good	6.298 \| good	0.145 \| good
2026-09-29T09:00:00.000Z	27 \| good	4.947 \| good	7.967 \| good	23.595 \| good	0.319 \| good	5.592 \| good	0.147 \| good
2026-09-29T10:00:00.000Z	38 \| good	6.659 \| good	9.464 \| good	27.007 \| good	0.313 \| good	4.89 \| good	0.147 \| good
2026-09-29T11:00:00.000Z	38 \| good	7.274 \| good	10.713 \| good	30.458 \| good	0.34 \| good	4.101 \| good	0.151 \| good
2026-09-29T12:00:00.000Z	44 \| good	8.314 \| good	11.962 \| good	33.851 \| good	0.405 \| good	4.225 \| good	0.149 \| good
2026-09-29T13:00:00.000Z	49 \| good	9.282 \| good	13.251 \| good	37.08 \| good	0.431 \| good	4.087 \| good	0.155 \| good
2026-09-29T14:00:00.000Z	54 \| moderate	10.738 \| good	15.425 \| good	38.766 \| good	0.509 \| good	4.115 \| good	0.16 \| good
2026-09-29T15:00:00.000Z	54 \| moderate	10.924 \| good	14.967 \| good	39.582 \| good	0.519 \| good	4.359 \| good	0.162 \| good
2026-09-29T16:00:00.000Z	49 \| good	9.347 \| good	13.297 \| good	38.446 \| good	0.48 \| good	4.977 \| good	0.158 \| good
2026-09-29T17:00:00.000Z	58 \| moderate	12.957 \| fine	15.428 \| good	36.104 \| good	0.495 \| good	6.463 \| good	0.164 \| good
2026-09-29T18:00:00.000Z	60 \| moderate	14.459 \| fine	16.373 \| good	33.445 \| good	0.546 \| good	8.121 \| good	0.173 \| good
2026-09-29T19:00:00.000Z	64 \| moderate	16.434 \| fine	19.86 \| good	30.519 \| good	0.612 \| good	9.149 \| good	0.186 \| good
2026-09-29T20:00:00.000Z	67 \| moderate	17.651 \| fine	21.113 \| good	29.784 \| good	0.677 \| good	8.848 \| good	0.189 \| good
2026-09-29T21:00:00.000Z	64 \| moderate	16.45 \| fine	20.343 \| good	27.367 \| good	0.572 \| good	8.558 \| good	0.175 \| good
2026-09-29T22:00:00.000Z	60 \| moderate	13.573 \| fine	17.514 \| good	25.309 \| good	0.421 \| good	7.284 \| good	0.163 \| good
2026-09-29T23:00:00.000Z	52 \| moderate	10.196 \| good	14.256 \| good	27.884 \| good	0.378 \| good	6.378 \| good	0.152 \| good
2026-09-30T00:00:00.000Z	44 \| good	7.763 \| good	10.546 \| good	33.142 \| good	0.353 \| good	5.629 \| good	0.145 \| good
2026-09-30T01:00:00.000Z	33 \| good	6.274 \| good	10.223 \| good	32.346 \| good	0.307 \| good	4.923 \| good	0.139 \| good
2026-09-30T02:00:00.000Z	29 \| good	5.224 \| good	8.952 \| good	31.296 \| good	0.298 \| good	4.312 \| good	0.13 \| good
2026-09-30T03:00:00.000Z	30 \| good	4.568 \| good	8.908 \| good	31.505 \| good	0.31 \| good	3.615 \| good	0.127 \| good
2026-09-30T04:00:00.000Z	30 \| good	4.555 \| good	10.181 \| good	31.642 \| good	0.326 \| good	3.316 \| good	0.127 \| good
2026-09-30T05:00:00.000Z	29 \| good	4.8 \| good	10.885 \| good	31.375 \| good	0.306 \| good	3.301 \| good	0.126 \| good
2026-09-30T06:00:00.000Z	30 \| good	5.351 \| good	11.23 \| good	31.667 \| good	0.264 \| good	3.915 \| good	0.127 \| good
2026-09-30T07:00:00.000Z	33 \| good	5.987 \| good	10.944 \| good	29.889 \| good	0.275 \| good	5.801 \| good	0.131 \| good
2026-09-30T08:00:00.000Z	33 \| good	5.661 \| good	8.856 \| good	27.379 \| good	0.288 \| good	7.204 \| good	0.133 \| good
2026-09-30T09:00:00.000Z	27 \| good	4.707 \| good	7.546 \| good	26.871 \| good	0.259 \| good	7.637 \| good	0.134 \| good
2026-09-30T10:00:00.000Z	27 \| good	5.002 \| good	6.781 \| good	29.202 \| good	0.203 \| good	6.157 \| good	0.129 \| good
2026-09-30T11:00:00.000Z	33 \| good	5.587 \| good	6.922 \| good	31.487 \| good	0.182 \| good	3.824 \| good	0.119 \| good
2026-09-30T12:00:00.000Z	30 \| good	5.117 \| good	7.151 \| good	32.04 \| good	0.156 \| good	2.922 \| good	0.113 \| good
2026-09-30T13:00:00.000Z	31 \| good	4.782 \| good	7.067 \| good	33.49 \| good	0.134 \| good	2.608 \| good	0.113 \| good
2026-09-30T14:00:00.000Z	32 \| good	4.076 \| good	7.041 \| good	35.247 \| good	0.124 \| good	2.343 \| good	0.113 \| good
2026-09-30T15:00:00.000Z	31 \| good	3.974 \| good	7.652 \| good	34.252 \| good	0.131 \| good	2.843 \| good	0.114 \| good
2026-09-30T16:00:00.000Z	31 \| good	4.313 \| good	7.932 \| good	32.906 \| good	0.151 \| good	3.775 \| good	0.116 \| good
2026-09-30T17:00:00.000Z	28 \| good	4.476 \| good	8.442 \| good	30.355 \| good	0.196 \| good	5.73 \| good	0.123 \| good
2026-09-30T18:00:00.000Z	27 \| good	5.305 \| good	9.888 \| good	25.341 \| good	0.279 \| good	9.149 \| good	0.135 \| good
2026-09-30T19:00:00.000Z	33 \| good	6.323 \| good	11.811 \| good	22.21 \| good	0.37 \| good	10.704 \| good	0.137 \| good
2026-09-30T20:00:00.000Z	38 \| good	6.827 \| good	12.343 \| good	21.297 \| good	0.384 \| good	10.833 \| good	0.141 \| 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?