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

The current PM10 concentration at Hertfordshire, UK is 20.765 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.471 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 28.457 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 6.586 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 7.962 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)

7.96 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

20.77 μg/m³

155

255

425

605+

Ozone (O₃)

28.46 ppb

201

201+

Sulfur Dioxide (SO₂)

0.47 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

6.59 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
2025-12-05T10:00:00.000Z	60 \| moderate	14.06 \| fine	33.26 \| good	9.738 \| good	1.149 \| good	22.818 \| good	0.063 \| good
2025-12-05T11:00:00.000Z	54 \| moderate	11.32 \| good	21.072 \| good	8.131 \| good	0.927 \| good	25.872 \| good	0.047 \| good
2025-12-05T12:00:00.000Z	54 \| moderate	11.12 \| good	14.272 \| good	9.149 \| good	0.865 \| good	25.596 \| good	0.048 \| good
2025-12-05T13:00:00.000Z	38 \| good	7.391 \| good	13.779 \| good	9.655 \| good	0.786 \| good	25.787 \| good	0.045 \| good
2025-12-05T14:00:00.000Z	52 \| moderate	9.558 \| good	13.831 \| good	13.002 \| good	0.874 \| good	20.021 \| good	0.051 \| good
2025-12-05T15:00:00.000Z	38 \| good	7.476 \| good	15.881 \| good	13.337 \| good	0.832 \| good	17.435 \| good	0.065 \| good
2025-12-05T16:00:00.000Z	33 \| good	5.589 \| good	10.186 \| good	15.327 \| good	0.824 \| good	21.028 \| good	0.057 \| good
2025-12-05T17:00:00.000Z	27 \| good	5.124 \| good	15.833 \| good	23.54 \| good	0.699 \| good	17.377 \| good	0.076 \| good
2025-12-05T18:00:00.000Z	33 \| good	5.509 \| good	13.946 \| good	21.245 \| good	0.659 \| good	12.504 \| good	1.451 \| good
2025-12-05T19:00:00.000Z	33 \| good	5.532 \| good	19.695 \| good	24.623 \| good	0.655 \| good	11.115 \| good	1.73 \| good
2025-12-05T20:00:00.000Z	27 \| good	5.261 \| good	17.716 \| good	28.488 \| good	0.662 \| good	8.772 \| good	2.091 \| good
2025-12-05T21:00:00.000Z	27 \| good	5.081 \| good	22.064 \| good	25.695 \| good	0.71 \| good	10.592 \| good	1.729 \| good
2025-12-05T22:00:00.000Z	44 \| good	8.246 \| good	11.963 \| good	28.242 \| good	0.667 \| good	13.533 \| good	0.056 \| good
2025-12-05T23:00:00.000Z	33 \| good	5.916 \| good	10.916 \| good	29.842 \| good	0.661 \| good	11.497 \| good	0.039 \| good
2025-12-06T00:00:00.000Z	26 \| good	4.157 \| good	22.053 \| good	28.216 \| good	0.609 \| good	4.309 \| good	1.146 \| good
2025-12-06T01:00:00.000Z	29 \| good	5.148 \| good	10.542 \| good	31.13 \| good	0.611 \| good	4.366 \| good	0.906 \| good
2025-12-06T02:00:00.000Z	33 \| good	5.526 \| good	16.56 \| good	35.241 \| good	0.612 \| good	3.156 \| good	0.92 \| good
2025-12-06T03:00:00.000Z	33 \| good	5.885 \| good	14.213 \| good	27.936 \| good	0.706 \| good	3.751 \| good	0.738 \| good
2025-12-06T04:00:00.000Z	38 \| good	6.603 \| good	12.585 \| good	28.845 \| good	0.614 \| good	3.63 \| good	0.652 \| good
2025-12-06T05:00:00.000Z	29 \| good	4.719 \| good	20.047 \| good	31.338 \| good	0.565 \| good	2.39 \| good	0.871 \| good
2025-12-06T06:00:00.000Z	29 \| good	4.917 \| good	14.892 \| good	30.536 \| good	0.626 \| good	2.939 \| good	0.528 \| good
2025-12-06T07:00:00.000Z	31 \| good	4.829 \| good	10.823 \| good	32.87 \| good	0.706 \| good	1.412 \| good	0.784 \| good
2025-12-06T08:00:00.000Z	31 \| good	5.055 \| good	16.13 \| good	32.952 \| good	0.642 \| good	2.604 \| good	0.505 \| good
2025-12-06T09:00:00.000Z	31 \| good	5.28 \| good	16.139 \| good	32.643 \| good	0.635 \| good	3.069 \| good	0.409 \| good
2025-12-06T10:00:00.000Z	33 \| good	6.107 \| good	15.863 \| good	33.266 \| good	0.713 \| good	4.366 \| good	0.32 \| good
2025-12-06T11:00:00.000Z	33 \| good	5.665 \| good	19.734 \| good	32.674 \| good	0.624 \| good	4.719 \| good	0.265 \| good
2025-12-06T12:00:00.000Z	33 \| good	5.842 \| good	16.502 \| good	33.536 \| good	0.705 \| good	3.846 \| good	0.538 \| good
2025-12-06T13:00:00.000Z	33 \| good	5.843 \| good	17.564 \| good	30.678 \| good	0.617 \| good	3.112 \| good	0.267 \| good
2025-12-06T14:00:00.000Z	33 \| good	5.686 \| good	15.554 \| good	29.71 \| good	0.618 \| good	2.941 \| good	0.246 \| good
2025-12-06T15:00:00.000Z	27 \| good	5.46 \| good	21.192 \| good	29.004 \| good	0.408 \| good	3.88 \| good	0.006 \| good
2025-12-06T16:00:00.000Z	38 \| good	6.739 \| good	20.27 \| good	32.395 \| good	0.479 \| good	5.085 \| good	0.006 \| good
2025-12-06T17:00:00.000Z	33 \| good	6.031 \| good	18.21 \| good	31.241 \| good	0.477 \| good	5.274 \| good	0.008 \| good
2025-12-06T18:00:00.000Z	38 \| good	6.766 \| good	15.439 \| good	30.104 \| good	0.473 \| good	5.46 \| good	0.01 \| good
2025-12-06T19:00:00.000Z	33 \| good	5.822 \| good	13.957 \| good	30.052 \| good	0.539 \| good	4.548 \| good	0.01 \| good
2025-12-06T20:00:00.000Z	31 \| good	5.487 \| good	9.784 \| good	34.092 \| good	0.539 \| good	3.899 \| good	0.014 \| good
2025-12-06T21:00:00.000Z	33 \| good	5.512 \| good	16.777 \| good	31.569 \| good	0.539 \| good	3.458 \| good	0.014 \| good
2025-12-06T22:00:00.000Z	38 \| good	6.627 \| good	22.362 \| good	30.906 \| good	0.542 \| good	3.53 \| good	0.024 \| good
2025-12-06T23:00:00.000Z	38 \| good	6.572 \| good	22.698 \| good	30.656 \| good	0.553 \| good	2.798 \| good	0.024 \| good
2025-12-07T00:00:00.000Z	44 \| good	8.284 \| good	29.217 \| good	30.772 \| good	0.61 \| good	2.482 \| good	0.74 \| good
2025-12-07T01:00:00.000Z	38 \| good	6.873 \| good	23.352 \| good	30.928 \| good	0.564 \| good	2.251 \| good	0.675 \| good
2025-12-07T02:00:00.000Z	44 \| good	7.822 \| good	20.154 \| good	32.604 \| good	0.655 \| good	1.902 \| good	0.578 \| good
2025-12-07T03:00:00.000Z	38 \| good	7.022 \| good	28.32 \| good	30.288 \| good	0.518 \| good	1.806 \| good	0.573 \| good
2025-12-07T04:00:00.000Z	38 \| good	7.342 \| good	24.68 \| good	32.501 \| good	0.429 \| good	1.703 \| good	0.493 \| good
2025-12-07T05:00:00.000Z	44 \| good	8.233 \| good	26.905 \| good	27.846 \| good	0.591 \| good	3.511 \| good	0.025 \| good
2025-12-07T06:00:00.000Z	38 \| good	6.684 \| good	25.695 \| good	32.603 \| good	0.456 \| good	4.293 \| good	0.012 \| good
2025-12-07T07:00:00.000Z	33 \| good	6.14 \| good	31.387 \| good	31.618 \| good	0.517 \| good	6.212 \| good	0.011 \| good
2025-12-07T08:00:00.000Z	49 \| good	9.26 \| good	22.821 \| good	31.391 \| good	0.497 \| good	10.437 \| good	0.013 \| good
2025-12-07T09:00:00.000Z	44 \| good	7.962 \| good	20.765 \| good	28.457 \| good	0.471 \| good	6.586 \| good	0.013 \| good
2025-12-07T10:00:00.000Z	38 \| good	6.999 \| good	10.209 \| good	15.676 \| good	0.689 \| good	14.076 \| good	0.144 \| good
2025-12-07T11:00:00.000Z	33 \| good	5.804 \| good	8.555 \| good	16.381 \| good	0.772 \| good	13.701 \| good	0.146 \| good
2025-12-07T12:00:00.000Z	27 \| good	4.872 \| good	7.301 \| good	19.131 \| good	0.556 \| good	12.317 \| good	0.14 \| good
2025-12-07T13:00:00.000Z	22 \| good	4.368 \| good	6.237 \| good	22.253 \| good	0.421 \| good	10.782 \| good	0.139 \| good
2025-12-07T14:00:00.000Z	22 \| good	3.914 \| good	5.332 \| good	21.839 \| good	0.344 \| good	11.139 \| good	0.135 \| good
2025-12-07T15:00:00.000Z	18 \| good	3.374 \| good	4.43 \| good	19.13 \| good	0.307 \| good	11.327 \| good	0.128 \| good
2025-12-07T16:00:00.000Z	22 \| good	3.512 \| good	4.202 \| good	19.43 \| good	0.242 \| good	9.366 \| good	0.124 \| good
2025-12-07T17:00:00.000Z	22 \| good	3.541 \| good	4.224 \| good	24.256 \| good	0.199 \| good	7.333 \| good	0.115 \| good
2025-12-07T18:00:00.000Z	29 \| good	4.004 \| good	6.625 \| good	30.745 \| good	0.2 \| good	4.309 \| good	0.107 \| good
2025-12-07T19:00:00.000Z	31 \| good	4.535 \| good	7.479 \| good	33.178 \| good	0.202 \| good	3.609 \| good	0.104 \| good
2025-12-07T20:00:00.000Z	32 \| good	4.304 \| good	6.839 \| good	34.625 \| good	0.193 \| good	3.292 \| good	0.102 \| good
2025-12-07T21:00:00.000Z	31 \| good	3.99 \| good	5.667 \| good	33.211 \| good	0.191 \| good	2.749 \| good	0.1 \| good
2025-12-07T22:00:00.000Z	30 \| good	3.217 \| good	4.462 \| good	32.458 \| good	0.165 \| good	2 \| good	0.102 \| good
2025-12-07T23:00:00.000Z	31 \| good	2.619 \| good	4.07 \| good	34.125 \| good	0.157 \| good	1.638 \| good	0.105 \| good
2025-12-08T00:00:00.000Z	31 \| good	2.425 \| good	4.515 \| good	34.16 \| good	0.178 \| good	1.454 \| good	0.107 \| good
2025-12-08T01:00:00.000Z	32 \| good	2.487 \| good	5.228 \| good	35.151 \| good	0.194 \| good	1.515 \| good	0.106 \| good
2025-12-08T02:00:00.000Z	33 \| good	2.849 \| good	5.403 \| good	35.602 \| good	0.204 \| good	1.385 \| good	0.105 \| good
2025-12-08T03:00:00.000Z	33 \| good	2.686 \| good	5.366 \| good	35.813 \| good	0.216 \| good	1.253 \| good	0.106 \| good
2025-12-08T04:00:00.000Z	31 \| good	2.695 \| good	5.243 \| good	34.059 \| good	0.23 \| good	1.262 \| good	0.106 \| good
2025-12-08T05:00:00.000Z	31 \| good	2.983 \| good	5.591 \| good	33.519 \| good	0.249 \| good	1.45 \| good	0.106 \| good
2025-12-08T06:00:00.000Z	31 \| good	2.873 \| good	5.969 \| good	33.325 \| good	0.228 \| good	1.961 \| good	0.104 \| good
2025-12-08T07:00:00.000Z	29 \| good	3.04 \| good	5.898 \| good	31.203 \| good	0.31 \| good	3.325 \| good	0.107 \| good
2025-12-08T08:00:00.000Z	27 \| good	3.668 \| good	7.609 \| good	28.848 \| good	0.42 \| good	5.536 \| good	0.111 \| good
2025-12-08T09:00:00.000Z	26 \| good	4.482 \| good	9.143 \| good	27.87 \| good	0.48 \| good	6.85 \| good	0.113 \| good
2025-12-08T10:00:00.000Z	27 \| good	5.001 \| good	9.359 \| good	28.325 \| good	0.427 \| good	6.485 \| good	0.113 \| good
2025-12-08T11:00:00.000Z	26 \| good	4.418 \| good	7.28 \| good	27.766 \| good	0.39 \| good	5.366 \| good	0.11 \| good
2025-12-08T12:00:00.000Z	29 \| good	3.629 \| good	5.422 \| good	30.771 \| good	0.396 \| good	4.473 \| good	0.109 \| good
2025-12-08T13:00:00.000Z	30 \| good	3.768 \| good	5.279 \| good	31.932 \| good	0.278 \| good	4.435 \| good	0.109 \| good
2025-12-08T14:00:00.000Z	28 \| good	3.402 \| good	5.063 \| good	29.813 \| good	0.273 \| good	4.82 \| good	0.111 \| good
2025-12-08T15:00:00.000Z	28 \| good	3.464 \| good	4.858 \| good	29.995 \| good	0.239 \| good	5.454 \| good	0.113 \| good
2025-12-08T16:00:00.000Z	27 \| good	3.841 \| good	5.307 \| good	28.823 \| good	0.249 \| good	6.313 \| good	0.117 \| good
2025-12-08T17:00:00.000Z	26 \| good	4.228 \| good	5.755 \| good	28.137 \| good	0.255 \| good	7.332 \| good	0.122 \| good
2025-12-08T18:00:00.000Z	27 \| good	5.071 \| good	6.977 \| good	27.953 \| good	0.299 \| good	8.185 \| good	0.127 \| good
2025-12-08T19:00:00.000Z	33 \| good	6.081 \| good	7.97 \| good	26.734 \| good	0.361 \| good	8.055 \| good	0.123 \| good
2025-12-08T20:00:00.000Z	38 \| good	6.801 \| good	8.81 \| good	25.688 \| good	0.424 \| good	8.47 \| good	0.12 \| good
2025-12-08T21:00:00.000Z	38 \| good	6.646 \| good	8.241 \| good	25.74 \| good	0.45 \| good	7.985 \| good	0.119 \| good
2025-12-08T22:00:00.000Z	33 \| good	6.007 \| good	7.619 \| good	26.602 \| good	0.435 \| good	7.206 \| good	0.119 \| good
2025-12-08T23:00:00.000Z	27 \| good	5.357 \| good	7.409 \| good	26.388 \| good	0.41 \| good	7.554 \| good	0.118 \| good
2025-12-09T00:00:00.000Z	27 \| good	4.73 \| good	8.054 \| good	25.353 \| good	0.388 \| good	7.002 \| good	0.116 \| good
2025-12-09T01:00:00.000Z	27 \| good	5.449 \| good	7.38 \| good	26.092 \| good	0.323 \| good	5.812 \| good	0.111 \| good
2025-12-09T02:00:00.000Z	27 \| good	4.852 \| good	7.589 \| good	26.787 \| good	0.252 \| good	4.702 \| good	0.106 \| good
2025-12-09T03:00:00.000Z	25 \| good	3.83 \| good	6.247 \| good	26.668 \| good	0.179 \| good	3.542 \| good	0.104 \| good
2025-12-09T04:00:00.000Z	26 \| good	2.752 \| good	3.238 \| good	27.833 \| good	0.118 \| good	2.56 \| good	0.102 \| good
2025-12-09T05:00:00.000Z	27 \| good	2.467 \| good	2.912 \| good	29.157 \| good	0.117 \| good	2.244 \| good	0.1 \| good
2025-12-09T06:00:00.000Z	27 \| good	2.427 \| good	2.794 \| good	28.933 \| good	0.162 \| good	2.402 \| good	0.099 \| good
2025-12-09T07:00:00.000Z	28 \| good	2.615 \| good	3.063 \| good	30.259 \| good	0.199 \| good	3.103 \| good	0.099 \| good
2025-12-09T08:00:00.000Z	28 \| good	2.487 \| good	3.303 \| good	29.7 \| good	0.262 \| good	3.99 \| good	0.102 \| good
2025-12-09T09:00:00.000Z	28 \| good	2.387 \| good	3.229 \| good	29.678 \| good	0.27 \| good	4.808 \| good	0.103 \| 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	49 Good	8.76μg/m³ Good	21.63μg/m³ Good	27.55ppb Good	0.37ppb Good	9.50ppb Good	0.00ppm Good
Chorleywood, Hertfordshire	38 Good	6.70μg/m³ Good	19.61μg/m³ Good	31.02ppb Good	0.45ppb Good	5.74ppb Good	0.01ppm Good
Hemel Hempstead, Hertfordshire	38 Good	6.77μg/m³ Good	20.43μg/m³ Good	31.24ppb Good	0.45ppb Good	6.52ppb Good	0.01ppm Good
Berkhamsted, Hertfordshire	38 Good	6.73μg/m³ Good	20.06μg/m³ Good	27.62ppb Good	0.43ppb Good	5.19ppb Good	0.02ppm Good
Cheshunt, Hertfordshire	49 Good	9.04μg/m³ Good	16.57μg/m³ Good	25.22ppb Good	0.50ppb Good	6.75ppb Good	0.01ppm Good
Hertford, Hertfordshire	52 Moderate	9.69μg/m³ Good	24.80μg/m³ Good	31.50ppb Good	0.50ppb Good	6.34ppb Good	0.01ppm Good
Abbots Langley, Hertfordshire	38 Good	6.77μg/m³ Good	20.43μg/m³ Good	31.24ppb Good	0.45ppb Good	6.52ppb Good	0.01ppm Good
Baldock, Hertfordshire	33 Good	6.21μg/m³ Good	20.18μg/m³ Good	27.50ppb Good	0.50ppb Good	5.24ppb Good	0.02ppm Good
Rickmansworth, Hertfordshire	38 Good	6.70μg/m³ Good	19.61μg/m³ Good	31.02ppb Good	0.45ppb Good	5.74ppb Good	0.01ppm Good
Borehamwood, Hertfordshire	44 Good	7.73μg/m³ Good	13.92μg/m³ Good	23.73ppb Good	0.41ppb Good	6.47ppb Good	0.01ppm Good
Bishop's Stortford, Hertfordshire	52 Moderate	10.38μg/m³ Good	19.97μg/m³ Good	31.28ppb Good	0.52ppb Good	5.34ppb Good	0.02ppm Good
Harpenden, Hertfordshire	38 Good	6.78μg/m³ Good	20.21μg/m³ Good	26.57ppb Good	0.45ppb Good	5.67ppb Good	0.01ppm Good
Hatfield, Hertfordshire	44 Good	8.26μg/m³ Good	16.88μg/m³ Good	23.91ppb Good	0.45ppb Good	4.15ppb Good	0.01ppm Good
Sawbridgeworth, Hertfordshire	52 Moderate	10.38μg/m³ Good	19.97μg/m³ Good	31.28ppb Good	0.52ppb Good	5.34ppb Good	0.02ppm Good
Potters Bar, Hertfordshire	49 Good	8.70μg/m³ Good	15.50μg/m³ Good	25.31ppb Good	0.48ppb Good	8.16ppb Good	0.00ppm Good
Stevenage, Hertfordshire	38 Good	6.73μg/m³ Good	22.71μg/m³ Good	31.10ppb Good	0.49ppb Good	10.00ppb Good	0.02ppm Good
Letchworth, Hertfordshire	38 Good	6.73μg/m³ Good	22.71μg/m³ Good	31.10ppb Good	0.49ppb Good	10.00ppb Good	0.02ppm Good
St Albans, Hertfordshire	49 Good	8.51μg/m³ Good	20.45μg/m³ Good	26.23ppb Good	0.40ppb Good	8.45ppb Good	0.01ppm Good
Hitchin, Hertfordshire	38 Good	6.73μg/m³ Good	22.71μg/m³ Good	31.10ppb Good	0.49ppb Good	10.00ppb Good	0.02ppm Good
Hoddesdon, Hertfordshire	49 Good	8.96μg/m³ Good	18.48μg/m³ Good	25.22ppb Good	0.49ppb Good	8.05ppb Good	0.01ppm Good
Royston, Hertfordshire	38 Good	6.61μg/m³ Good	37.80μg/m³ Good	28.91ppb Good	0.50ppb Good	3.29ppb Good	0.02ppm Good
Tring, Hertfordshire	38 Good	6.74μg/m³ Good	21.00μg/m³ Good	28.70ppb Good	0.44ppb Good	3.02ppb Good	0.02ppm Good
Ware, Hertfordshire	49 Good	9.15μg/m³ Good	27.74μg/m³ Good	31.24ppb Good	0.50ppb Good	5.81ppb Good	0.01ppm Good
Welwyn Garden City, Hertfordshire	49 Good	9.26μg/m³ Good	22.82μg/m³ Good	31.39ppb Good	0.50ppb Good	10.44ppb Good	0.01ppm Good
Waltham Cross, Hertfordshire	49 Good	9.13μg/m³ Good	14.69μg/m³ Good	25.22ppb Good	0.50ppb Good	4.19ppb Good	0.01ppm Good
Watford, Hertfordshire	49 Good	8.85μg/m³ Good	19.01μg/m³ Good	23.65ppb Good	0.50ppb Good	5.32ppb 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

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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 2025-12-07.

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 03:00:00 on 2025-12-06.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 44, categorized as Good based on real-time data.

What pollutant is the most common in Hertfordshire, UK?

The most common pollutant in Hertfordshire, UK is PM2.5.

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

If the air quality in Hertfordshire, UK is poor, consider staying indoors and wearing a mask to protect yourself.

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

The current PM_2.5 concentration at Hertfordshire, UK is 7.962 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 20.765 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.013 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.471 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 28.457 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 6.586 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-12-05T10:00:00.000Z	60 \| moderate	14.06 \| fine	33.26 \| good	9.738 \| good	1.149 \| good	22.818 \| good	0.063 \| good
2025-12-05T11:00:00.000Z	54 \| moderate	11.32 \| good	21.072 \| good	8.131 \| good	0.927 \| good	25.872 \| good	0.047 \| good
2025-12-05T12:00:00.000Z	54 \| moderate	11.12 \| good	14.272 \| good	9.149 \| good	0.865 \| good	25.596 \| good	0.048 \| good
2025-12-05T13:00:00.000Z	38 \| good	7.391 \| good	13.779 \| good	9.655 \| good	0.786 \| good	25.787 \| good	0.045 \| good
2025-12-05T14:00:00.000Z	52 \| moderate	9.558 \| good	13.831 \| good	13.002 \| good	0.874 \| good	20.021 \| good	0.051 \| good
2025-12-05T15:00:00.000Z	38 \| good	7.476 \| good	15.881 \| good	13.337 \| good	0.832 \| good	17.435 \| good	0.065 \| good
2025-12-05T16:00:00.000Z	33 \| good	5.589 \| good	10.186 \| good	15.327 \| good	0.824 \| good	21.028 \| good	0.057 \| good
2025-12-05T17:00:00.000Z	27 \| good	5.124 \| good	15.833 \| good	23.54 \| good	0.699 \| good	17.377 \| good	0.076 \| good
2025-12-05T18:00:00.000Z	33 \| good	5.509 \| good	13.946 \| good	21.245 \| good	0.659 \| good	12.504 \| good	1.451 \| good
2025-12-05T19:00:00.000Z	33 \| good	5.532 \| good	19.695 \| good	24.623 \| good	0.655 \| good	11.115 \| good	1.73 \| good
2025-12-05T20:00:00.000Z	27 \| good	5.261 \| good	17.716 \| good	28.488 \| good	0.662 \| good	8.772 \| good	2.091 \| good
2025-12-05T21:00:00.000Z	27 \| good	5.081 \| good	22.064 \| good	25.695 \| good	0.71 \| good	10.592 \| good	1.729 \| good
2025-12-05T22:00:00.000Z	44 \| good	8.246 \| good	11.963 \| good	28.242 \| good	0.667 \| good	13.533 \| good	0.056 \| good
2025-12-05T23:00:00.000Z	33 \| good	5.916 \| good	10.916 \| good	29.842 \| good	0.661 \| good	11.497 \| good	0.039 \| good
2025-12-06T00:00:00.000Z	26 \| good	4.157 \| good	22.053 \| good	28.216 \| good	0.609 \| good	4.309 \| good	1.146 \| good
2025-12-06T01:00:00.000Z	29 \| good	5.148 \| good	10.542 \| good	31.13 \| good	0.611 \| good	4.366 \| good	0.906 \| good
2025-12-06T02:00:00.000Z	33 \| good	5.526 \| good	16.56 \| good	35.241 \| good	0.612 \| good	3.156 \| good	0.92 \| good
2025-12-06T03:00:00.000Z	33 \| good	5.885 \| good	14.213 \| good	27.936 \| good	0.706 \| good	3.751 \| good	0.738 \| good
2025-12-06T04:00:00.000Z	38 \| good	6.603 \| good	12.585 \| good	28.845 \| good	0.614 \| good	3.63 \| good	0.652 \| good
2025-12-06T05:00:00.000Z	29 \| good	4.719 \| good	20.047 \| good	31.338 \| good	0.565 \| good	2.39 \| good	0.871 \| good
2025-12-06T06:00:00.000Z	29 \| good	4.917 \| good	14.892 \| good	30.536 \| good	0.626 \| good	2.939 \| good	0.528 \| good
2025-12-06T07:00:00.000Z	31 \| good	4.829 \| good	10.823 \| good	32.87 \| good	0.706 \| good	1.412 \| good	0.784 \| good
2025-12-06T08:00:00.000Z	31 \| good	5.055 \| good	16.13 \| good	32.952 \| good	0.642 \| good	2.604 \| good	0.505 \| good
2025-12-06T09:00:00.000Z	31 \| good	5.28 \| good	16.139 \| good	32.643 \| good	0.635 \| good	3.069 \| good	0.409 \| good
2025-12-06T10:00:00.000Z	33 \| good	6.107 \| good	15.863 \| good	33.266 \| good	0.713 \| good	4.366 \| good	0.32 \| good
2025-12-06T11:00:00.000Z	33 \| good	5.665 \| good	19.734 \| good	32.674 \| good	0.624 \| good	4.719 \| good	0.265 \| good
2025-12-06T12:00:00.000Z	33 \| good	5.842 \| good	16.502 \| good	33.536 \| good	0.705 \| good	3.846 \| good	0.538 \| good
2025-12-06T13:00:00.000Z	33 \| good	5.843 \| good	17.564 \| good	30.678 \| good	0.617 \| good	3.112 \| good	0.267 \| good
2025-12-06T14:00:00.000Z	33 \| good	5.686 \| good	15.554 \| good	29.71 \| good	0.618 \| good	2.941 \| good	0.246 \| good
2025-12-06T15:00:00.000Z	27 \| good	5.46 \| good	21.192 \| good	29.004 \| good	0.408 \| good	3.88 \| good	0.006 \| good
2025-12-06T16:00:00.000Z	38 \| good	6.739 \| good	20.27 \| good	32.395 \| good	0.479 \| good	5.085 \| good	0.006 \| good
2025-12-06T17:00:00.000Z	33 \| good	6.031 \| good	18.21 \| good	31.241 \| good	0.477 \| good	5.274 \| good	0.008 \| good
2025-12-06T18:00:00.000Z	38 \| good	6.766 \| good	15.439 \| good	30.104 \| good	0.473 \| good	5.46 \| good	0.01 \| good
2025-12-06T19:00:00.000Z	33 \| good	5.822 \| good	13.957 \| good	30.052 \| good	0.539 \| good	4.548 \| good	0.01 \| good
2025-12-06T20:00:00.000Z	31 \| good	5.487 \| good	9.784 \| good	34.092 \| good	0.539 \| good	3.899 \| good	0.014 \| good
2025-12-06T21:00:00.000Z	33 \| good	5.512 \| good	16.777 \| good	31.569 \| good	0.539 \| good	3.458 \| good	0.014 \| good
2025-12-06T22:00:00.000Z	38 \| good	6.627 \| good	22.362 \| good	30.906 \| good	0.542 \| good	3.53 \| good	0.024 \| good
2025-12-06T23:00:00.000Z	38 \| good	6.572 \| good	22.698 \| good	30.656 \| good	0.553 \| good	2.798 \| good	0.024 \| good
2025-12-07T00:00:00.000Z	44 \| good	8.284 \| good	29.217 \| good	30.772 \| good	0.61 \| good	2.482 \| good	0.74 \| good
2025-12-07T01:00:00.000Z	38 \| good	6.873 \| good	23.352 \| good	30.928 \| good	0.564 \| good	2.251 \| good	0.675 \| good
2025-12-07T02:00:00.000Z	44 \| good	7.822 \| good	20.154 \| good	32.604 \| good	0.655 \| good	1.902 \| good	0.578 \| good
2025-12-07T03:00:00.000Z	38 \| good	7.022 \| good	28.32 \| good	30.288 \| good	0.518 \| good	1.806 \| good	0.573 \| good
2025-12-07T04:00:00.000Z	38 \| good	7.342 \| good	24.68 \| good	32.501 \| good	0.429 \| good	1.703 \| good	0.493 \| good
2025-12-07T05:00:00.000Z	44 \| good	8.233 \| good	26.905 \| good	27.846 \| good	0.591 \| good	3.511 \| good	0.025 \| good
2025-12-07T06:00:00.000Z	38 \| good	6.684 \| good	25.695 \| good	32.603 \| good	0.456 \| good	4.293 \| good	0.012 \| good
2025-12-07T07:00:00.000Z	33 \| good	6.14 \| good	31.387 \| good	31.618 \| good	0.517 \| good	6.212 \| good	0.011 \| good
2025-12-07T08:00:00.000Z	49 \| good	9.26 \| good	22.821 \| good	31.391 \| good	0.497 \| good	10.437 \| good	0.013 \| good
2025-12-07T09:00:00.000Z	44 \| good	7.962 \| good	20.765 \| good	28.457 \| good	0.471 \| good	6.586 \| good	0.013 \| good
2025-12-07T10:00:00.000Z	38 \| good	6.999 \| good	10.209 \| good	15.676 \| good	0.689 \| good	14.076 \| good	0.144 \| good
2025-12-07T11:00:00.000Z	33 \| good	5.804 \| good	8.555 \| good	16.381 \| good	0.772 \| good	13.701 \| good	0.146 \| good
2025-12-07T12:00:00.000Z	27 \| good	4.872 \| good	7.301 \| good	19.131 \| good	0.556 \| good	12.317 \| good	0.14 \| good
2025-12-07T13:00:00.000Z	22 \| good	4.368 \| good	6.237 \| good	22.253 \| good	0.421 \| good	10.782 \| good	0.139 \| good
2025-12-07T14:00:00.000Z	22 \| good	3.914 \| good	5.332 \| good	21.839 \| good	0.344 \| good	11.139 \| good	0.135 \| good
2025-12-07T15:00:00.000Z	18 \| good	3.374 \| good	4.43 \| good	19.13 \| good	0.307 \| good	11.327 \| good	0.128 \| good
2025-12-07T16:00:00.000Z	22 \| good	3.512 \| good	4.202 \| good	19.43 \| good	0.242 \| good	9.366 \| good	0.124 \| good
2025-12-07T17:00:00.000Z	22 \| good	3.541 \| good	4.224 \| good	24.256 \| good	0.199 \| good	7.333 \| good	0.115 \| good
2025-12-07T18:00:00.000Z	29 \| good	4.004 \| good	6.625 \| good	30.745 \| good	0.2 \| good	4.309 \| good	0.107 \| good
2025-12-07T19:00:00.000Z	31 \| good	4.535 \| good	7.479 \| good	33.178 \| good	0.202 \| good	3.609 \| good	0.104 \| good
2025-12-07T20:00:00.000Z	32 \| good	4.304 \| good	6.839 \| good	34.625 \| good	0.193 \| good	3.292 \| good	0.102 \| good
2025-12-07T21:00:00.000Z	31 \| good	3.99 \| good	5.667 \| good	33.211 \| good	0.191 \| good	2.749 \| good	0.1 \| good
2025-12-07T22:00:00.000Z	30 \| good	3.217 \| good	4.462 \| good	32.458 \| good	0.165 \| good	2 \| good	0.102 \| good
2025-12-07T23:00:00.000Z	31 \| good	2.619 \| good	4.07 \| good	34.125 \| good	0.157 \| good	1.638 \| good	0.105 \| good
2025-12-08T00:00:00.000Z	31 \| good	2.425 \| good	4.515 \| good	34.16 \| good	0.178 \| good	1.454 \| good	0.107 \| good
2025-12-08T01:00:00.000Z	32 \| good	2.487 \| good	5.228 \| good	35.151 \| good	0.194 \| good	1.515 \| good	0.106 \| good
2025-12-08T02:00:00.000Z	33 \| good	2.849 \| good	5.403 \| good	35.602 \| good	0.204 \| good	1.385 \| good	0.105 \| good
2025-12-08T03:00:00.000Z	33 \| good	2.686 \| good	5.366 \| good	35.813 \| good	0.216 \| good	1.253 \| good	0.106 \| good
2025-12-08T04:00:00.000Z	31 \| good	2.695 \| good	5.243 \| good	34.059 \| good	0.23 \| good	1.262 \| good	0.106 \| good
2025-12-08T05:00:00.000Z	31 \| good	2.983 \| good	5.591 \| good	33.519 \| good	0.249 \| good	1.45 \| good	0.106 \| good
2025-12-08T06:00:00.000Z	31 \| good	2.873 \| good	5.969 \| good	33.325 \| good	0.228 \| good	1.961 \| good	0.104 \| good
2025-12-08T07:00:00.000Z	29 \| good	3.04 \| good	5.898 \| good	31.203 \| good	0.31 \| good	3.325 \| good	0.107 \| good
2025-12-08T08:00:00.000Z	27 \| good	3.668 \| good	7.609 \| good	28.848 \| good	0.42 \| good	5.536 \| good	0.111 \| good
2025-12-08T09:00:00.000Z	26 \| good	4.482 \| good	9.143 \| good	27.87 \| good	0.48 \| good	6.85 \| good	0.113 \| good
2025-12-08T10:00:00.000Z	27 \| good	5.001 \| good	9.359 \| good	28.325 \| good	0.427 \| good	6.485 \| good	0.113 \| good
2025-12-08T11:00:00.000Z	26 \| good	4.418 \| good	7.28 \| good	27.766 \| good	0.39 \| good	5.366 \| good	0.11 \| good
2025-12-08T12:00:00.000Z	29 \| good	3.629 \| good	5.422 \| good	30.771 \| good	0.396 \| good	4.473 \| good	0.109 \| good
2025-12-08T13:00:00.000Z	30 \| good	3.768 \| good	5.279 \| good	31.932 \| good	0.278 \| good	4.435 \| good	0.109 \| good
2025-12-08T14:00:00.000Z	28 \| good	3.402 \| good	5.063 \| good	29.813 \| good	0.273 \| good	4.82 \| good	0.111 \| good
2025-12-08T15:00:00.000Z	28 \| good	3.464 \| good	4.858 \| good	29.995 \| good	0.239 \| good	5.454 \| good	0.113 \| good
2025-12-08T16:00:00.000Z	27 \| good	3.841 \| good	5.307 \| good	28.823 \| good	0.249 \| good	6.313 \| good	0.117 \| good
2025-12-08T17:00:00.000Z	26 \| good	4.228 \| good	5.755 \| good	28.137 \| good	0.255 \| good	7.332 \| good	0.122 \| good
2025-12-08T18:00:00.000Z	27 \| good	5.071 \| good	6.977 \| good	27.953 \| good	0.299 \| good	8.185 \| good	0.127 \| good
2025-12-08T19:00:00.000Z	33 \| good	6.081 \| good	7.97 \| good	26.734 \| good	0.361 \| good	8.055 \| good	0.123 \| good
2025-12-08T20:00:00.000Z	38 \| good	6.801 \| good	8.81 \| good	25.688 \| good	0.424 \| good	8.47 \| good	0.12 \| good
2025-12-08T21:00:00.000Z	38 \| good	6.646 \| good	8.241 \| good	25.74 \| good	0.45 \| good	7.985 \| good	0.119 \| good
2025-12-08T22:00:00.000Z	33 \| good	6.007 \| good	7.619 \| good	26.602 \| good	0.435 \| good	7.206 \| good	0.119 \| good
2025-12-08T23:00:00.000Z	27 \| good	5.357 \| good	7.409 \| good	26.388 \| good	0.41 \| good	7.554 \| good	0.118 \| good
2025-12-09T00:00:00.000Z	27 \| good	4.73 \| good	8.054 \| good	25.353 \| good	0.388 \| good	7.002 \| good	0.116 \| good
2025-12-09T01:00:00.000Z	27 \| good	5.449 \| good	7.38 \| good	26.092 \| good	0.323 \| good	5.812 \| good	0.111 \| good
2025-12-09T02:00:00.000Z	27 \| good	4.852 \| good	7.589 \| good	26.787 \| good	0.252 \| good	4.702 \| good	0.106 \| good
2025-12-09T03:00:00.000Z	25 \| good	3.83 \| good	6.247 \| good	26.668 \| good	0.179 \| good	3.542 \| good	0.104 \| good
2025-12-09T04:00:00.000Z	26 \| good	2.752 \| good	3.238 \| good	27.833 \| good	0.118 \| good	2.56 \| good	0.102 \| good
2025-12-09T05:00:00.000Z	27 \| good	2.467 \| good	2.912 \| good	29.157 \| good	0.117 \| good	2.244 \| good	0.1 \| good
2025-12-09T06:00:00.000Z	27 \| good	2.427 \| good	2.794 \| good	28.933 \| good	0.162 \| good	2.402 \| good	0.099 \| good
2025-12-09T07:00:00.000Z	28 \| good	2.615 \| good	3.063 \| good	30.259 \| good	0.199 \| good	3.103 \| good	0.099 \| good
2025-12-09T08:00:00.000Z	28 \| good	2.487 \| good	3.303 \| good	29.7 \| good	0.262 \| good	3.99 \| good	0.102 \| good
2025-12-09T09:00:00.000Z	28 \| good	2.387 \| good	3.229 \| good	29.678 \| good	0.27 \| good	4.808 \| good	0.103 \| 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?