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

The current PM10 concentration at Hertfordshire, UK is 20.916 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 1.328 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 12.406 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 14.773 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 7.906 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)

9.21 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

22.27 μg/m³

155

255

425

605+

Ozone (O₃)

18.08 ppb

201

201+

Sulfur Dioxide (SO₂)

0.80 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

11.63 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
2025-11-05T23:00:00.000Z	38 \| good	6.718 \| good	23.848 \| good	18.699 \| good	0.53 \| good	5.021 \| good	0.034 \| good
2025-11-06T00:00:00.000Z	38 \| good	6.613 \| good	12.801 \| good	19.516 \| good	0.808 \| good	15.895 \| good	0.637 \| good
2025-11-06T01:00:00.000Z	38 \| good	6.803 \| good	9.106 \| good	24.173 \| good	0.341 \| good	5.793 \| good	0.121 \| good
2025-11-06T02:00:00.000Z	38 \| good	6.753 \| good	9.096 \| good	24.367 \| good	0.31 \| good	5.084 \| good	0.121 \| good
2025-11-06T03:00:00.000Z	38 \| good	6.662 \| good	8.88 \| good	23.881 \| good	0.331 \| good	4.509 \| good	0.119 \| good
2025-11-06T04:00:00.000Z	38 \| good	6.705 \| good	8.878 \| good	23.454 \| good	0.33 \| good	4.26 \| good	0.119 \| good
2025-11-06T05:00:00.000Z	38 \| good	6.701 \| good	8.891 \| good	22.811 \| good	0.307 \| good	4.235 \| good	0.12 \| good
2025-11-06T06:00:00.000Z	44 \| good	7.681 \| good	25.703 \| good	13.592 \| good	0.539 \| good	7.866 \| good	0.009 \| good
2025-11-06T07:00:00.000Z	38 \| good	6.591 \| good	18.204 \| good	16.38 \| good	0.893 \| good	8.208 \| good	0.603 \| good
2025-11-06T08:00:00.000Z	33 \| good	6.46 \| good	21.362 \| good	14.038 \| good	0.684 \| good	8.959 \| good	0.011 \| good
2025-11-06T09:00:00.000Z	44 \| good	7.591 \| good	21.741 \| good	18.268 \| good	1.017 \| good	21.089 \| good	0.514 \| good
2025-11-06T10:00:00.000Z	38 \| good	7.44 \| good	22.183 \| good	15.382 \| good	0.683 \| good	12.878 \| good	0.008 \| good
2025-11-06T11:00:00.000Z	44 \| good	7.677 \| good	22.089 \| good	14.347 \| good	0.61 \| good	17.963 \| good	0.009 \| good
2025-11-06T12:00:00.000Z	38 \| good	6.847 \| good	16.954 \| good	18.032 \| good	0.69 \| good	16.585 \| good	0.005 \| good
2025-11-06T13:00:00.000Z	44 \| good	7.623 \| good	21.959 \| good	13.824 \| good	0.801 \| good	10.404 \| good	0.005 \| good
2025-11-06T14:00:00.000Z	38 \| good	7.419 \| good	15.38 \| good	12.858 \| good	0.996 \| good	9.234 \| good	0.005 \| good
2025-11-06T15:00:00.000Z	33 \| good	6.18 \| good	23.441 \| good	14.541 \| good	0.937 \| good	9.128 \| good	0.005 \| good
2025-11-06T16:00:00.000Z	33 \| good	6.454 \| good	23.96 \| good	20.47 \| good	0.834 \| good	14.032 \| good	0.008 \| good
2025-11-06T17:00:00.000Z	38 \| good	7.02 \| good	17.815 \| good	18.231 \| good	0.642 \| good	14.908 \| good	0.014 \| good
2025-11-06T18:00:00.000Z	44 \| good	7.721 \| good	26.971 \| good	20.76 \| good	0.884 \| good	15.75 \| good	0.02 \| good
2025-11-06T19:00:00.000Z	33 \| good	6.492 \| good	29.532 \| good	21.451 \| good	1.062 \| good	11.043 \| good	0.016 \| good
2025-11-06T20:00:00.000Z	33 \| good	5.619 \| good	28.586 \| good	16.112 \| good	0.834 \| good	10.593 \| good	0.018 \| good
2025-11-06T21:00:00.000Z	38 \| good	7.46 \| good	32.076 \| good	16.364 \| good	0.759 \| good	18.972 \| good	0.014 \| good
2025-11-06T22:00:00.000Z	49 \| good	9.18 \| good	21.325 \| good	17.809 \| good	0.997 \| good	15.523 \| good	0.017 \| good
2025-11-06T23:00:00.000Z	38 \| good	6.812 \| good	12.989 \| good	18.187 \| good	0.699 \| good	15.554 \| good	0.019 \| good
2025-11-07T00:00:00.000Z	60 \| moderate	13.939 \| fine	34.8 \| good	13.385 \| good	1.287 \| good	16.957 \| good	0.553 \| good
2025-11-07T01:00:00.000Z	44 \| good	7.69 \| good	25.191 \| good	8.817 \| good	1.353 \| good	18.777 \| good	0.485 \| good
2025-11-07T02:00:00.000Z	54 \| moderate	10.926 \| good	22.52 \| good	7.942 \| good	1.152 \| good	11.547 \| good	0.441 \| good
2025-11-07T03:00:00.000Z	44 \| good	8.017 \| good	22.257 \| good	7.185 \| good	1.582 \| good	10.304 \| good	0.401 \| good
2025-11-07T04:00:00.000Z	49 \| good	9.362 \| good	38.482 \| good	8.927 \| good	1.963 \| good	8.093 \| good	0.34 \| good
2025-11-07T05:00:00.000Z	49 \| good	8.874 \| good	31.472 \| good	14.047 \| good	1.701 \| good	11.418 \| good	0.338 \| good
2025-11-07T06:00:00.000Z	33 \| good	5.56 \| good	15.3 \| good	15.939 \| good	0.451 \| good	12.148 \| good	0.007 \| good
2025-11-07T07:00:00.000Z	54 \| moderate	10.894 \| good	13.542 \| good	12.836 \| good	1.91 \| good	6.243 \| good	0.01 \| good
2025-11-07T08:00:00.000Z	38 \| good	6.716 \| good	22.268 \| good	13.019 \| good	0.695 \| good	6.205 \| good	0.008 \| good
2025-11-07T09:00:00.000Z	54 \| moderate	11.381 \| good	13.008 \| good	13.293 \| good	0.676 \| good	13.381 \| good	0.148 \| good
2025-11-07T10:00:00.000Z	52 \| moderate	10.196 \| good	11.682 \| good	13.58 \| good	0.674 \| good	12.962 \| good	0.144 \| good
2025-11-07T11:00:00.000Z	49 \| good	8.62 \| good	9.961 \| good	15.89 \| good	0.733 \| good	11.838 \| good	0.144 \| good
2025-11-07T12:00:00.000Z	38 \| good	7.024 \| good	9.106 \| good	16.298 \| good	0.583 \| good	10.224 \| good	0.145 \| good
2025-11-07T13:00:00.000Z	52 \| moderate	9.86 \| good	22.645 \| good	18.627 \| good	0.516 \| good	18.149 \| good	0.007 \| good
2025-11-07T14:00:00.000Z	56 \| moderate	12.3 \| fine	29.766 \| good	17.881 \| good	0.512 \| good	13.129 \| good	0.01 \| good
2025-11-07T15:00:00.000Z	38 \| good	7.449 \| good	30.376 \| good	16.296 \| good	0.515 \| good	11.991 \| good	0.009 \| good
2025-11-07T16:00:00.000Z	44 \| good	8.012 \| good	19.867 \| good	18.301 \| good	0.637 \| good	10 \| good	0.01 \| good
2025-11-07T17:00:00.000Z	44 \| good	7.86 \| good	16.1 \| good	18.02 \| good	0.57 \| good	13.511 \| good	0.012 \| good
2025-11-07T18:00:00.000Z	38 \| good	7.118 \| good	20.952 \| good	18.291 \| good	1.892 \| good	10.116 \| good	0.015 \| good
2025-11-07T19:00:00.000Z	52 \| moderate	9.92 \| good	24.982 \| good	21.544 \| good	1.818 \| good	11.26 \| good	0.019 \| good
2025-11-07T20:00:00.000Z	44 \| good	8.485 \| good	25.517 \| good	21.943 \| good	0.554 \| good	17.574 \| good	0.017 \| good
2025-11-07T21:00:00.000Z	44 \| good	8.2 \| good	34.528 \| good	18.184 \| good	0.49 \| good	15.131 \| good	0.017 \| good
2025-11-07T22:00:00.000Z	56 \| moderate	12.3 \| fine	26.233 \| good	18.827 \| good	0.506 \| good	11.63 \| good	0.019 \| good
2025-11-07T22:00:00.000Z	49 \| good	9.212 \| good	22.275 \| good	18.077 \| good	0.799 \| good	11.629 \| good	0.018 \| good
2025-11-07T02:00:00.000Z	58 \| moderate	12.875 \| fine	15.093 \| good	7.246 \| good	0.85 \| good	17.318 \| good	0.147 \| good
2025-11-07T03:00:00.000Z	58 \| moderate	13.353 \| fine	15.406 \| good	9.911 \| good	0.663 \| good	14.854 \| good	0.141 \| good
2025-11-07T04:00:00.000Z	58 \| moderate	12.641 \| fine	15.012 \| good	11.331 \| good	0.512 \| good	12.999 \| good	0.136 \| good
2025-11-07T05:00:00.000Z	56 \| moderate	11.951 \| good	14.106 \| good	12.87 \| good	0.467 \| good	10.993 \| good	0.135 \| good
2025-11-07T06:00:00.000Z	54 \| moderate	11.305 \| good	13.289 \| good	13.795 \| good	0.478 \| good	10.345 \| good	0.137 \| good
2025-11-07T07:00:00.000Z	54 \| moderate	11.44 \| good	13.638 \| good	12.013 \| good	0.607 \| good	10.467 \| good	0.143 \| good
2025-11-07T08:00:00.000Z	56 \| moderate	11.696 \| good	13.426 \| good	12.284 \| good	0.677 \| good	11.871 \| good	0.149 \| good
2025-11-07T09:00:00.000Z	54 \| moderate	11.381 \| good	13.008 \| good	13.293 \| good	0.676 \| good	13.381 \| good	0.148 \| good
2025-11-07T10:00:00.000Z	52 \| moderate	10.196 \| good	11.682 \| good	13.58 \| good	0.674 \| good	12.962 \| good	0.144 \| good
2025-11-07T11:00:00.000Z	49 \| good	8.968 \| good	11.087 \| good	15.195 \| good	0.709 \| good	11.525 \| good	0.143 \| good
2025-11-07T12:00:00.000Z	44 \| good	7.712 \| good	10.011 \| good	17.787 \| good	0.726 \| good	9.118 \| good	0.138 \| good
2025-11-07T13:00:00.000Z	33 \| good	5.876 \| good	8.191 \| good	18.165 \| good	0.65 \| good	8.362 \| good	0.132 \| good
2025-11-07T14:00:00.000Z	33 \| good	5.898 \| good	7.473 \| good	20.295 \| good	0.529 \| good	6.773 \| good	0.126 \| good
2025-11-07T15:00:00.000Z	33 \| good	5.727 \| good	8.367 \| good	21.989 \| good	0.466 \| good	7.687 \| good	0.126 \| good
2025-11-07T16:00:00.000Z	33 \| good	6.39 \| good	9.859 \| good	20.89 \| good	0.524 \| good	9.345 \| good	0.129 \| good
2025-11-07T17:00:00.000Z	38 \| good	7.045 \| good	9.872 \| good	19.191 \| good	0.534 \| good	11.55 \| good	0.133 \| good
2025-11-07T18:00:00.000Z	44 \| good	7.543 \| good	10.223 \| good	17.632 \| good	0.609 \| good	13.394 \| good	0.137 \| good
2025-11-07T19:00:00.000Z	44 \| good	7.812 \| good	10.577 \| good	16.578 \| good	0.726 \| good	13.312 \| good	0.137 \| good
2025-11-07T20:00:00.000Z	38 \| good	7.334 \| good	10.156 \| good	15.947 \| good	0.779 \| good	13.132 \| good	0.132 \| good
2025-11-07T21:00:00.000Z	38 \| good	6.79 \| good	9.419 \| good	16.163 \| good	0.791 \| good	11.566 \| good	0.128 \| good
2025-11-07T22:00:00.000Z	33 \| good	6.317 \| good	9.183 \| good	19.529 \| good	0.716 \| good	10.016 \| good	0.124 \| good
2025-11-07T23:00:00.000Z	33 \| good	6.152 \| good	8.807 \| good	21.845 \| good	0.694 \| good	9.417 \| good	0.122 \| good
2025-11-08T00:00:00.000Z	33 \| good	6.195 \| good	8.447 \| good	22.429 \| good	0.599 \| good	9.058 \| good	0.122 \| good
2025-11-08T01:00:00.000Z	33 \| good	6.433 \| good	8.31 \| good	22.477 \| good	0.484 \| good	8.371 \| good	0.12 \| good
2025-11-08T02:00:00.000Z	33 \| good	6.242 \| good	9.133 \| good	22.848 \| good	0.407 \| good	8.082 \| good	0.121 \| good
2025-11-08T03:00:00.000Z	38 \| good	6.656 \| good	10.274 \| good	22.566 \| good	0.383 \| good	7.582 \| good	0.121 \| good
2025-11-08T04:00:00.000Z	38 \| good	7.441 \| good	10.816 \| good	21.806 \| good	0.327 \| good	7.266 \| good	0.12 \| good
2025-11-08T05:00:00.000Z	38 \| good	6.887 \| good	10.929 \| good	20.924 \| good	0.323 \| good	6.505 \| good	0.119 \| good
2025-11-08T06:00:00.000Z	44 \| good	8.056 \| good	12.489 \| good	19.7 \| good	0.352 \| good	6.488 \| good	0.12 \| good
2025-11-08T07:00:00.000Z	49 \| good	8.861 \| good	13.737 \| good	19.91 \| good	0.409 \| good	6.755 \| good	0.122 \| good
2025-11-08T08:00:00.000Z	49 \| good	8.913 \| good	14.408 \| good	17.748 \| good	0.485 \| good	8.468 \| good	0.125 \| good
2025-11-08T09:00:00.000Z	49 \| good	8.555 \| good	14.741 \| good	15.908 \| good	0.493 \| good	9.915 \| good	0.135 \| good
2025-11-08T10:00:00.000Z	38 \| good	7.363 \| good	14.129 \| good	19.962 \| good	0.484 \| good	9.771 \| good	0.136 \| good
2025-11-08T11:00:00.000Z	38 \| good	6.709 \| good	13.689 \| good	21.381 \| good	0.421 \| good	7.94 \| good	0.134 \| good
2025-11-08T12:00:00.000Z	33 \| good	5.874 \| good	11.911 \| good	23.592 \| good	0.339 \| good	6.725 \| good	0.128 \| good
2025-11-08T13:00:00.000Z	27 \| good	4.987 \| good	10.338 \| good	28 \| good	0.328 \| good	6.037 \| good	0.125 \| good
2025-11-08T14:00:00.000Z	26 \| good	4.332 \| good	8.758 \| good	28.472 \| good	0.312 \| good	6.022 \| good	0.125 \| good
2025-11-08T15:00:00.000Z	26 \| good	4.225 \| good	8.802 \| good	28.219 \| good	0.344 \| good	6.289 \| good	0.126 \| good
2025-11-08T16:00:00.000Z	27 \| good	5.086 \| good	10.023 \| good	26.571 \| good	0.469 \| good	8.798 \| good	0.13 \| good
2025-11-08T17:00:00.000Z	33 \| good	6.37 \| good	12.09 \| good	21.073 \| good	0.69 \| good	13.156 \| good	0.141 \| good
2025-11-08T18:00:00.000Z	49 \| good	8.536 \| good	14.078 \| good	15.714 \| good	0.887 \| good	16.893 \| good	0.152 \| good
2025-11-08T19:00:00.000Z	54 \| moderate	11.182 \| good	17.233 \| good	13.66 \| good	0.895 \| good	19.382 \| good	0.161 \| good
2025-11-08T20:00:00.000Z	58 \| moderate	12.92 \| fine	19.608 \| good	12.896 \| good	0.956 \| good	19.217 \| good	0.161 \| good
2025-11-08T21:00:00.000Z	60 \| moderate	14.159 \| fine	21.03 \| good	11.313 \| good	0.991 \| good	18.403 \| good	0.161 \| good
2025-11-08T22:00:00.000Z	60 \| moderate	14.098 \| fine	21.495 \| good	8.126 \| good	0.984 \| good	19.164 \| good	0.165 \| good
2025-11-08T23:00:00.000Z	60 \| moderate	14.357 \| fine	21.823 \| good	5.914 \| good	0.89 \| good	17.995 \| good	0.166 \| good
2025-11-09T00:00:00.000Z	60 \| moderate	14.043 \| fine	21.711 \| good	6.388 \| good	0.754 \| good	17.417 \| good	0.161 \| good
2025-11-09T01:00:00.000Z	60 \| moderate	13.978 \| fine	20.764 \| good	5.834 \| good	0.641 \| good	17.073 \| good	0.157 \| 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
Harpenden, Hertfordshire	49 Good	8.65μg/m³ Good	31.49μg/m³ Good	20.18ppb Good	0.57ppb Good	14.16ppb Good	0.01ppm Good
Hertford, Hertfordshire	54 Moderate	10.56μg/m³ Good	16.10μg/m³ Good	20.74ppb Good	0.59ppb Good	9.57ppb Good	0.01ppm Good
Berkhamsted, Hertfordshire	49 Good	9.22μg/m³ Good	20.11μg/m³ Good	18.16ppb Good	0.57ppb Good	5.13ppb Good	0.01ppm Good
Bushey, Hertfordshire	44 Good	8.24μg/m³ Good	21.69μg/m³ Good	20.19ppb Good	0.34ppb Good	16.64ppb Good	0.00ppm Good
Hatfield, Hertfordshire	52 Moderate	10.25μg/m³ Good	16.63μg/m³ Good	20.74ppb Good	0.55ppb Good	17.07ppb Good	0.01ppm Good
Abbots Langley, Hertfordshire	44 Good	8.26μg/m³ Good	28.95μg/m³ Good	15.69ppb Good	0.56ppb Good	12.11ppb Good	0.01ppm Good
Borehamwood, Hertfordshire	49 Good	9.20μg/m³ Good	15.17μg/m³ Good	18.41ppb Good	0.45ppb Good	10.81ppb Good	0.00ppm Good
Cheshunt, Hertfordshire	54 Moderate	11.31μg/m³ Good	17.66μg/m³ Good	18.34ppb Good	0.74ppb Good	13.45ppb Good	0.01ppm Good
Chorleywood, Hertfordshire	44 Good	7.51μg/m³ Good	21.58μg/m³ Good	15.89ppb Good	0.55ppb Good	9.57ppb Good	0.01ppm Good
Rickmansworth, Hertfordshire	44 Good	7.51μg/m³ Good	21.58μg/m³ Good	15.89ppb Good	0.55ppb Good	9.57ppb Good	0.01ppm Good
Baldock, Hertfordshire	44 Good	7.84μg/m³ Good	24.37μg/m³ Good	18.21ppb Good	1.74ppb Good	7.83ppb Good	0.02ppm Good
Hemel Hempstead, Hertfordshire	44 Good	8.26μg/m³ Good	28.95μg/m³ Good	15.69ppb Good	0.56ppb Good	12.11ppb Good	0.01ppm Good
Bishop's Stortford, Hertfordshire	22 Good	3.78μg/m³ Good	21.30μg/m³ Good	18.50ppb Good	1.83ppb Good	7.29ppb Good	0.02ppm Good
Hitchin, Hertfordshire	49 Good	8.93μg/m³ Good	23.89μg/m³ Good	17.96ppb Good	0.58ppb Good	9.57ppb Good	0.01ppm Good
Hoddesdon, Hertfordshire	54 Moderate	11.19μg/m³ Good	18.93μg/m³ Good	18.61ppb Good	0.74ppb Good	14.64ppb Good	0.01ppm Good
Letchworth, Hertfordshire	49 Good	8.93μg/m³ Good	23.89μg/m³ Good	17.96ppb Good	0.58ppb Good	9.57ppb Good	0.01ppm Good
Royston, Hertfordshire	31 Good	5.44μg/m³ Good	33.21μg/m³ Good	17.92ppb Good	2.34ppb Good	6.99ppb Good	0.02ppm Good
Potters Bar, Hertfordshire	52 Moderate	9.93μg/m³ Good	15.32μg/m³ Good	17.78ppb Good	0.68ppb Good	11.21ppb Good	0.00ppm Good
Sawbridgeworth, Hertfordshire	22 Good	3.78μg/m³ Good	21.30μg/m³ Good	18.50ppb Good	1.83ppb Good	7.29ppb Good	0.02ppm Good
Stevenage, Hertfordshire	49 Good	8.93μg/m³ Good	23.89μg/m³ Good	17.96ppb Good	0.58ppb Good	9.57ppb Good	0.01ppm Good
St Albans, Hertfordshire	49 Good	9.14μg/m³ Good	23.95μg/m³ Good	19.13ppb Good	0.42ppb Good	14.80ppb Good	0.01ppm Good
Watford, Hertfordshire	44 Good	8.26μg/m³ Good	19.20μg/m³ Good	16.77ppb Good	0.52ppb Good	13.59ppb Good	0.01ppm Good
Welwyn Garden City, Hertfordshire	44 Good	7.86μg/m³ Good	16.10μg/m³ Good	18.02ppb Good	0.57ppb Good	13.51ppb Good	0.01ppm Good
Waltham Cross, Hertfordshire	54 Moderate	11.43μg/m³ Good	16.43μg/m³ Good	18.07ppb Good	0.74ppb Good	11.67ppb Good	0.01ppm Good
Tring, Hertfordshire	44 Good	8.35μg/m³ Good	13.58μg/m³ Good	17.97ppb Good	0.58ppb Good	6.41ppb Good	0.02ppm Good
Ware, Hertfordshire	27 Good	3.78μg/m³ Good	28.81μg/m³ Good	18.03ppb Good	0.59ppb Good	10.11ppb Good	0.01ppm Good

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

0.55ppm

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 12:00:00 on 2025-11-07.

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 08:00:00 on 2025-11-06.

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 7.906 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 20.916 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.485 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 1.328 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 12.406 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 14.773 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-11-05T23:00:00.000Z	38 \| good	6.718 \| good	23.848 \| good	18.699 \| good	0.53 \| good	5.021 \| good	0.034 \| good
2025-11-06T00:00:00.000Z	38 \| good	6.613 \| good	12.801 \| good	19.516 \| good	0.808 \| good	15.895 \| good	0.637 \| good
2025-11-06T01:00:00.000Z	38 \| good	6.803 \| good	9.106 \| good	24.173 \| good	0.341 \| good	5.793 \| good	0.121 \| good
2025-11-06T02:00:00.000Z	38 \| good	6.753 \| good	9.096 \| good	24.367 \| good	0.31 \| good	5.084 \| good	0.121 \| good
2025-11-06T03:00:00.000Z	38 \| good	6.662 \| good	8.88 \| good	23.881 \| good	0.331 \| good	4.509 \| good	0.119 \| good
2025-11-06T04:00:00.000Z	38 \| good	6.705 \| good	8.878 \| good	23.454 \| good	0.33 \| good	4.26 \| good	0.119 \| good
2025-11-06T05:00:00.000Z	38 \| good	6.701 \| good	8.891 \| good	22.811 \| good	0.307 \| good	4.235 \| good	0.12 \| good
2025-11-06T06:00:00.000Z	44 \| good	7.681 \| good	25.703 \| good	13.592 \| good	0.539 \| good	7.866 \| good	0.009 \| good
2025-11-06T07:00:00.000Z	38 \| good	6.591 \| good	18.204 \| good	16.38 \| good	0.893 \| good	8.208 \| good	0.603 \| good
2025-11-06T08:00:00.000Z	33 \| good	6.46 \| good	21.362 \| good	14.038 \| good	0.684 \| good	8.959 \| good	0.011 \| good
2025-11-06T09:00:00.000Z	44 \| good	7.591 \| good	21.741 \| good	18.268 \| good	1.017 \| good	21.089 \| good	0.514 \| good
2025-11-06T10:00:00.000Z	38 \| good	7.44 \| good	22.183 \| good	15.382 \| good	0.683 \| good	12.878 \| good	0.008 \| good
2025-11-06T11:00:00.000Z	44 \| good	7.677 \| good	22.089 \| good	14.347 \| good	0.61 \| good	17.963 \| good	0.009 \| good
2025-11-06T12:00:00.000Z	38 \| good	6.847 \| good	16.954 \| good	18.032 \| good	0.69 \| good	16.585 \| good	0.005 \| good
2025-11-06T13:00:00.000Z	44 \| good	7.623 \| good	21.959 \| good	13.824 \| good	0.801 \| good	10.404 \| good	0.005 \| good
2025-11-06T14:00:00.000Z	38 \| good	7.419 \| good	15.38 \| good	12.858 \| good	0.996 \| good	9.234 \| good	0.005 \| good
2025-11-06T15:00:00.000Z	33 \| good	6.18 \| good	23.441 \| good	14.541 \| good	0.937 \| good	9.128 \| good	0.005 \| good
2025-11-06T16:00:00.000Z	33 \| good	6.454 \| good	23.96 \| good	20.47 \| good	0.834 \| good	14.032 \| good	0.008 \| good
2025-11-06T17:00:00.000Z	38 \| good	7.02 \| good	17.815 \| good	18.231 \| good	0.642 \| good	14.908 \| good	0.014 \| good
2025-11-06T18:00:00.000Z	44 \| good	7.721 \| good	26.971 \| good	20.76 \| good	0.884 \| good	15.75 \| good	0.02 \| good
2025-11-06T19:00:00.000Z	33 \| good	6.492 \| good	29.532 \| good	21.451 \| good	1.062 \| good	11.043 \| good	0.016 \| good
2025-11-06T20:00:00.000Z	33 \| good	5.619 \| good	28.586 \| good	16.112 \| good	0.834 \| good	10.593 \| good	0.018 \| good
2025-11-06T21:00:00.000Z	38 \| good	7.46 \| good	32.076 \| good	16.364 \| good	0.759 \| good	18.972 \| good	0.014 \| good
2025-11-06T22:00:00.000Z	49 \| good	9.18 \| good	21.325 \| good	17.809 \| good	0.997 \| good	15.523 \| good	0.017 \| good
2025-11-06T23:00:00.000Z	38 \| good	6.812 \| good	12.989 \| good	18.187 \| good	0.699 \| good	15.554 \| good	0.019 \| good
2025-11-07T00:00:00.000Z	60 \| moderate	13.939 \| fine	34.8 \| good	13.385 \| good	1.287 \| good	16.957 \| good	0.553 \| good
2025-11-07T01:00:00.000Z	44 \| good	7.69 \| good	25.191 \| good	8.817 \| good	1.353 \| good	18.777 \| good	0.485 \| good
2025-11-07T02:00:00.000Z	54 \| moderate	10.926 \| good	22.52 \| good	7.942 \| good	1.152 \| good	11.547 \| good	0.441 \| good
2025-11-07T03:00:00.000Z	44 \| good	8.017 \| good	22.257 \| good	7.185 \| good	1.582 \| good	10.304 \| good	0.401 \| good
2025-11-07T04:00:00.000Z	49 \| good	9.362 \| good	38.482 \| good	8.927 \| good	1.963 \| good	8.093 \| good	0.34 \| good
2025-11-07T05:00:00.000Z	49 \| good	8.874 \| good	31.472 \| good	14.047 \| good	1.701 \| good	11.418 \| good	0.338 \| good
2025-11-07T06:00:00.000Z	33 \| good	5.56 \| good	15.3 \| good	15.939 \| good	0.451 \| good	12.148 \| good	0.007 \| good
2025-11-07T07:00:00.000Z	54 \| moderate	10.894 \| good	13.542 \| good	12.836 \| good	1.91 \| good	6.243 \| good	0.01 \| good
2025-11-07T08:00:00.000Z	38 \| good	6.716 \| good	22.268 \| good	13.019 \| good	0.695 \| good	6.205 \| good	0.008 \| good
2025-11-07T09:00:00.000Z	54 \| moderate	11.381 \| good	13.008 \| good	13.293 \| good	0.676 \| good	13.381 \| good	0.148 \| good
2025-11-07T10:00:00.000Z	52 \| moderate	10.196 \| good	11.682 \| good	13.58 \| good	0.674 \| good	12.962 \| good	0.144 \| good
2025-11-07T11:00:00.000Z	49 \| good	8.62 \| good	9.961 \| good	15.89 \| good	0.733 \| good	11.838 \| good	0.144 \| good
2025-11-07T12:00:00.000Z	38 \| good	7.024 \| good	9.106 \| good	16.298 \| good	0.583 \| good	10.224 \| good	0.145 \| good
2025-11-07T13:00:00.000Z	52 \| moderate	9.86 \| good	22.645 \| good	18.627 \| good	0.516 \| good	18.149 \| good	0.007 \| good
2025-11-07T14:00:00.000Z	56 \| moderate	12.3 \| fine	29.766 \| good	17.881 \| good	0.512 \| good	13.129 \| good	0.01 \| good
2025-11-07T15:00:00.000Z	38 \| good	7.449 \| good	30.376 \| good	16.296 \| good	0.515 \| good	11.991 \| good	0.009 \| good
2025-11-07T16:00:00.000Z	44 \| good	8.012 \| good	19.867 \| good	18.301 \| good	0.637 \| good	10 \| good	0.01 \| good
2025-11-07T17:00:00.000Z	44 \| good	7.86 \| good	16.1 \| good	18.02 \| good	0.57 \| good	13.511 \| good	0.012 \| good
2025-11-07T18:00:00.000Z	38 \| good	7.118 \| good	20.952 \| good	18.291 \| good	1.892 \| good	10.116 \| good	0.015 \| good
2025-11-07T19:00:00.000Z	52 \| moderate	9.92 \| good	24.982 \| good	21.544 \| good	1.818 \| good	11.26 \| good	0.019 \| good
2025-11-07T20:00:00.000Z	44 \| good	8.485 \| good	25.517 \| good	21.943 \| good	0.554 \| good	17.574 \| good	0.017 \| good
2025-11-07T21:00:00.000Z	44 \| good	8.2 \| good	34.528 \| good	18.184 \| good	0.49 \| good	15.131 \| good	0.017 \| good
2025-11-07T22:00:00.000Z	56 \| moderate	12.3 \| fine	26.233 \| good	18.827 \| good	0.506 \| good	11.63 \| good	0.019 \| good
2025-11-07T22:00:00.000Z	49 \| good	9.212 \| good	22.275 \| good	18.077 \| good	0.799 \| good	11.629 \| good	0.018 \| good
2025-11-07T02:00:00.000Z	58 \| moderate	12.875 \| fine	15.093 \| good	7.246 \| good	0.85 \| good	17.318 \| good	0.147 \| good
2025-11-07T03:00:00.000Z	58 \| moderate	13.353 \| fine	15.406 \| good	9.911 \| good	0.663 \| good	14.854 \| good	0.141 \| good
2025-11-07T04:00:00.000Z	58 \| moderate	12.641 \| fine	15.012 \| good	11.331 \| good	0.512 \| good	12.999 \| good	0.136 \| good
2025-11-07T05:00:00.000Z	56 \| moderate	11.951 \| good	14.106 \| good	12.87 \| good	0.467 \| good	10.993 \| good	0.135 \| good
2025-11-07T06:00:00.000Z	54 \| moderate	11.305 \| good	13.289 \| good	13.795 \| good	0.478 \| good	10.345 \| good	0.137 \| good
2025-11-07T07:00:00.000Z	54 \| moderate	11.44 \| good	13.638 \| good	12.013 \| good	0.607 \| good	10.467 \| good	0.143 \| good
2025-11-07T08:00:00.000Z	56 \| moderate	11.696 \| good	13.426 \| good	12.284 \| good	0.677 \| good	11.871 \| good	0.149 \| good
2025-11-07T09:00:00.000Z	54 \| moderate	11.381 \| good	13.008 \| good	13.293 \| good	0.676 \| good	13.381 \| good	0.148 \| good
2025-11-07T10:00:00.000Z	52 \| moderate	10.196 \| good	11.682 \| good	13.58 \| good	0.674 \| good	12.962 \| good	0.144 \| good
2025-11-07T11:00:00.000Z	49 \| good	8.968 \| good	11.087 \| good	15.195 \| good	0.709 \| good	11.525 \| good	0.143 \| good
2025-11-07T12:00:00.000Z	44 \| good	7.712 \| good	10.011 \| good	17.787 \| good	0.726 \| good	9.118 \| good	0.138 \| good
2025-11-07T13:00:00.000Z	33 \| good	5.876 \| good	8.191 \| good	18.165 \| good	0.65 \| good	8.362 \| good	0.132 \| good
2025-11-07T14:00:00.000Z	33 \| good	5.898 \| good	7.473 \| good	20.295 \| good	0.529 \| good	6.773 \| good	0.126 \| good
2025-11-07T15:00:00.000Z	33 \| good	5.727 \| good	8.367 \| good	21.989 \| good	0.466 \| good	7.687 \| good	0.126 \| good
2025-11-07T16:00:00.000Z	33 \| good	6.39 \| good	9.859 \| good	20.89 \| good	0.524 \| good	9.345 \| good	0.129 \| good
2025-11-07T17:00:00.000Z	38 \| good	7.045 \| good	9.872 \| good	19.191 \| good	0.534 \| good	11.55 \| good	0.133 \| good
2025-11-07T18:00:00.000Z	44 \| good	7.543 \| good	10.223 \| good	17.632 \| good	0.609 \| good	13.394 \| good	0.137 \| good
2025-11-07T19:00:00.000Z	44 \| good	7.812 \| good	10.577 \| good	16.578 \| good	0.726 \| good	13.312 \| good	0.137 \| good
2025-11-07T20:00:00.000Z	38 \| good	7.334 \| good	10.156 \| good	15.947 \| good	0.779 \| good	13.132 \| good	0.132 \| good
2025-11-07T21:00:00.000Z	38 \| good	6.79 \| good	9.419 \| good	16.163 \| good	0.791 \| good	11.566 \| good	0.128 \| good
2025-11-07T22:00:00.000Z	33 \| good	6.317 \| good	9.183 \| good	19.529 \| good	0.716 \| good	10.016 \| good	0.124 \| good
2025-11-07T23:00:00.000Z	33 \| good	6.152 \| good	8.807 \| good	21.845 \| good	0.694 \| good	9.417 \| good	0.122 \| good
2025-11-08T00:00:00.000Z	33 \| good	6.195 \| good	8.447 \| good	22.429 \| good	0.599 \| good	9.058 \| good	0.122 \| good
2025-11-08T01:00:00.000Z	33 \| good	6.433 \| good	8.31 \| good	22.477 \| good	0.484 \| good	8.371 \| good	0.12 \| good
2025-11-08T02:00:00.000Z	33 \| good	6.242 \| good	9.133 \| good	22.848 \| good	0.407 \| good	8.082 \| good	0.121 \| good
2025-11-08T03:00:00.000Z	38 \| good	6.656 \| good	10.274 \| good	22.566 \| good	0.383 \| good	7.582 \| good	0.121 \| good
2025-11-08T04:00:00.000Z	38 \| good	7.441 \| good	10.816 \| good	21.806 \| good	0.327 \| good	7.266 \| good	0.12 \| good
2025-11-08T05:00:00.000Z	38 \| good	6.887 \| good	10.929 \| good	20.924 \| good	0.323 \| good	6.505 \| good	0.119 \| good
2025-11-08T06:00:00.000Z	44 \| good	8.056 \| good	12.489 \| good	19.7 \| good	0.352 \| good	6.488 \| good	0.12 \| good
2025-11-08T07:00:00.000Z	49 \| good	8.861 \| good	13.737 \| good	19.91 \| good	0.409 \| good	6.755 \| good	0.122 \| good
2025-11-08T08:00:00.000Z	49 \| good	8.913 \| good	14.408 \| good	17.748 \| good	0.485 \| good	8.468 \| good	0.125 \| good
2025-11-08T09:00:00.000Z	49 \| good	8.555 \| good	14.741 \| good	15.908 \| good	0.493 \| good	9.915 \| good	0.135 \| good
2025-11-08T10:00:00.000Z	38 \| good	7.363 \| good	14.129 \| good	19.962 \| good	0.484 \| good	9.771 \| good	0.136 \| good
2025-11-08T11:00:00.000Z	38 \| good	6.709 \| good	13.689 \| good	21.381 \| good	0.421 \| good	7.94 \| good	0.134 \| good
2025-11-08T12:00:00.000Z	33 \| good	5.874 \| good	11.911 \| good	23.592 \| good	0.339 \| good	6.725 \| good	0.128 \| good
2025-11-08T13:00:00.000Z	27 \| good	4.987 \| good	10.338 \| good	28 \| good	0.328 \| good	6.037 \| good	0.125 \| good
2025-11-08T14:00:00.000Z	26 \| good	4.332 \| good	8.758 \| good	28.472 \| good	0.312 \| good	6.022 \| good	0.125 \| good
2025-11-08T15:00:00.000Z	26 \| good	4.225 \| good	8.802 \| good	28.219 \| good	0.344 \| good	6.289 \| good	0.126 \| good
2025-11-08T16:00:00.000Z	27 \| good	5.086 \| good	10.023 \| good	26.571 \| good	0.469 \| good	8.798 \| good	0.13 \| good
2025-11-08T17:00:00.000Z	33 \| good	6.37 \| good	12.09 \| good	21.073 \| good	0.69 \| good	13.156 \| good	0.141 \| good
2025-11-08T18:00:00.000Z	49 \| good	8.536 \| good	14.078 \| good	15.714 \| good	0.887 \| good	16.893 \| good	0.152 \| good
2025-11-08T19:00:00.000Z	54 \| moderate	11.182 \| good	17.233 \| good	13.66 \| good	0.895 \| good	19.382 \| good	0.161 \| good
2025-11-08T20:00:00.000Z	58 \| moderate	12.92 \| fine	19.608 \| good	12.896 \| good	0.956 \| good	19.217 \| good	0.161 \| good
2025-11-08T21:00:00.000Z	60 \| moderate	14.159 \| fine	21.03 \| good	11.313 \| good	0.991 \| good	18.403 \| good	0.161 \| good
2025-11-08T22:00:00.000Z	60 \| moderate	14.098 \| fine	21.495 \| good	8.126 \| good	0.984 \| good	19.164 \| good	0.165 \| good
2025-11-08T23:00:00.000Z	60 \| moderate	14.357 \| fine	21.823 \| good	5.914 \| good	0.89 \| good	17.995 \| good	0.166 \| good
2025-11-09T00:00:00.000Z	60 \| moderate	14.043 \| fine	21.711 \| good	6.388 \| good	0.754 \| good	17.417 \| good	0.161 \| good
2025-11-09T01:00:00.000Z	60 \| moderate	13.978 \| fine	20.764 \| good	5.834 \| good	0.641 \| good	17.073 \| good	0.157 \| 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?