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

The current PM10 concentration at Hertfordshire, UK is 17.731 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.642 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 21.476 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 11.195 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 7.667 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)

7.67 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

17.73 μg/m³

155

255

425

605+

Ozone (O₃)

21.48 ppb

201

201+

Sulfur Dioxide (SO₂)

0.64 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

11.20 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.76 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
2026-11-11T00:00:00.000Z	67 \| moderate	18.084 \| fine	21.763 \| good	14.026 \| good	1.286 \| good	11.555 \| good	0.642 \| good
2026-11-11T01:00:00.000Z	62 \| moderate	14.707 \| fine	28.135 \| good	14.36 \| good	0.867 \| good	10.821 \| good	0.623 \| good
2026-11-11T02:00:00.000Z	54 \| moderate	11.207 \| good	21.275 \| good	13.906 \| good	0.861 \| good	8.309 \| good	0.623 \| good
2026-11-11T03:00:00.000Z	60 \| moderate	14.303 \| fine	34.061 \| good	17.058 \| good	0.853 \| good	9.139 \| good	0.623 \| good
2026-11-11T04:00:00.000Z	54 \| moderate	11.2 \| good	37.262 \| good	17.842 \| good	0.853 \| good	4.786 \| good	0.623 \| good
2026-11-11T05:00:00.000Z	54 \| moderate	10.8 \| good	37.645 \| good	19.676 \| good	0.863 \| good	4.99 \| good	0.623 \| good
2026-11-11T06:00:00.000Z	58 \| moderate	12.96 \| fine	26.54 \| good	18.867 \| good	0.852 \| good	7.535 \| good	0.623 \| good
2026-11-11T07:00:00.000Z	49 \| good	9.191 \| good	23.82 \| good	18.272 \| good	0.847 \| good	4.409 \| good	0.742 \| good
2026-11-11T08:00:00.000Z	56 \| moderate	12.359 \| fine	21.711 \| good	18.782 \| good	0.848 \| good	8.31 \| good	0.623 \| good
2026-11-11T09:00:00.000Z	58 \| moderate	13.233 \| fine	22.74 \| good	19.706 \| good	0.91 \| good	9.479 \| good	0.623 \| good
2026-11-11T10:00:00.000Z	52 \| moderate	9.66 \| good	27.3 \| good	17.167 \| good	0.901 \| good	9.972 \| good	0.623 \| good
2026-11-11T11:00:00.000Z	52 \| moderate	9.66 \| good	35.509 \| good	17.619 \| good	0.894 \| good	9.615 \| good	0.623 \| good
2026-11-11T12:00:00.000Z	66 \| moderate	17.169 \| fine	33.351 \| good	16.313 \| good	0.854 \| good	11.244 \| good	0.623 \| good
2026-11-11T13:00:00.000Z	56 \| moderate	12.427 \| fine	21.36 \| good	16.137 \| good	0.722 \| good	10.919 \| good	0.623 \| good
2026-11-11T14:00:00.000Z	18 \| good	2.4 \| good	11.15 \| good	18.589 \| good	0.602 \| good	10.749 \| good	0.623 \| good
2026-11-11T15:00:00.000Z	60 \| moderate	14.197 \| fine	14.374 \| good	20.725 \| good	1.259 \| good	7.431 \| good	0.623 \| good
2026-11-11T16:00:00.000Z	60 \| moderate	14.048 \| fine	35.15 \| good	16.248 \| good	0.713 \| good	10.04 \| good	0.743 \| good
2026-11-11T17:00:00.000Z	62 \| moderate	15.16 \| fine	32.119 \| good	20.656 \| good	0.916 \| good	13.529 \| good	0.702 \| good
2026-11-11T18:00:00.000Z	62 \| moderate	15.032 \| fine	32.956 \| good	16.884 \| good	0.855 \| good	15.285 \| good	0.682 \| good
2026-11-11T19:00:00.000Z	71 \| moderate	19.934 \| fine	36.934 \| good	17.93 \| good	0.937 \| good	13.71 \| good	0.722 \| good
2026-11-11T20:00:00.000Z	56 \| moderate	11.515 \| good	23.056 \| good	17.608 \| good	0.857 \| good	11.615 \| good	0.642 \| good
2026-11-11T21:00:00.000Z	22 \| good	4 \| good	18.315 \| good	18.978 \| good	0.905 \| good	9.417 \| good	0.642 \| good
2026-11-11T22:00:00.000Z	67 \| moderate	17.971 \| fine	19.54 \| good	19.258 \| good	0.83 \| good	13.341 \| good	0.642 \| good
2026-11-11T23:00:00.000Z	67 \| moderate	18.224 \| fine	25.83 \| good	15.28 \| good	0.832 \| good	10.516 \| good	0.623 \| good
2026-11-12T00:00:00.000Z	56 \| moderate	12.314 \| fine	40.826 \| good	15.205 \| good	0.767 \| good	9.956 \| good	0.623 \| good
2026-11-12T01:00:00.000Z	49 \| good	9.047 \| good	25.15 \| good	16.038 \| good	0.767 \| good	7.998 \| good	0.623 \| good
2026-11-12T02:00:00.000Z	49 \| good	8.865 \| good	16.802 \| good	16.894 \| good	0.763 \| good	7.38 \| good	0.623 \| good
2026-11-12T03:00:00.000Z	38 \| good	7.266 \| good	16.679 \| good	16.058 \| good	0.762 \| good	7.069 \| good	0.623 \| good
2026-11-12T04:00:00.000Z	44 \| good	8.032 \| good	23.134 \| good	17.087 \| good	0.764 \| good	8.434 \| good	0.623 \| good
2026-11-12T05:00:00.000Z	49 \| good	8.831 \| good	16.409 \| good	16.152 \| good	0.833 \| good	6.691 \| good	0.642 \| good
2026-11-12T06:00:00.000Z	44 \| good	8.44 \| good	17.2 \| good	18.714 \| good	0.836 \| good	8.057 \| good	0.662 \| good
2026-11-12T07:00:00.000Z	56 \| moderate	11.703 \| good	18.408 \| good	16.984 \| good	0.832 \| good	8.901 \| good	0.662 \| good
2026-11-12T08:00:00.000Z	44 \| good	8.343 \| good	17.12 \| good	10.495 \| good	0.972 \| good	12.109 \| good	0.682 \| good
2026-11-12T09:00:00.000Z	38 \| good	7.388 \| good	25.861 \| good	12.361 \| good	1.115 \| good	11.213 \| good	0.702 \| good
2026-11-12T10:00:00.000Z	44 \| good	7.637 \| good	22.78 \| good	15.029 \| good	1.028 \| good	14.631 \| good	0.702 \| good
2026-11-12T11:00:00.000Z	49 \| good	9.327 \| good	14.711 \| good	20.907 \| good	3.003 \| good	12.319 \| good	0.682 \| good
2026-11-12T12:00:00.000Z	49 \| good	8.993 \| good	33.964 \| good	18.944 \| good	3.121 \| good	10.201 \| good	0.682 \| good
2026-11-12T13:00:00.000Z	44 \| good	8.181 \| good	38.107 \| good	15.335 \| good	0.828 \| good	8.86 \| good	0.682 \| good
2026-11-12T14:00:00.000Z	49 \| good	9.054 \| good	19.09 \| good	15.414 \| good	0.711 \| good	8.272 \| good	0.682 \| good
2026-11-12T15:00:00.000Z	44 \| good	8.239 \| good	21.284 \| good	16.292 \| good	0.712 \| good	6.494 \| good	0.702 \| good
2026-11-12T16:00:00.000Z	49 \| good	8.573 \| good	25.043 \| good	22.513 \| good	0.695 \| good	7.666 \| good	0.761 \| good
2026-11-12T17:00:00.000Z	44 \| good	8.489 \| good	15.816 \| good	24.987 \| good	0.785 \| good	10.286 \| good	0.826 \| good
2026-11-12T18:00:00.000Z	44 \| good	7.913 \| good	36.346 \| good	24.96 \| good	0.791 \| good	13.815 \| good	0.761 \| good
2026-11-12T19:00:00.000Z	44 \| good	8.32 \| good	19.474 \| good	24.117 \| good	0.655 \| good	11.654 \| good	0.781 \| good
2026-11-12T20:00:00.000Z	49 \| good	9.374 \| good	13.592 \| good	22.669 \| good	0.717 \| good	9.132 \| good	0.781 \| good
2026-11-12T21:00:00.000Z	49 \| good	9.137 \| good	17.843 \| good	21.37 \| good	0.652 \| good	9.779 \| good	0.801 \| good
2026-11-12T22:00:00.000Z	44 \| good	7.972 \| good	16 \| good	20.364 \| good	0.656 \| good	7.129 \| good	0.761 \| good
2026-11-12T23:00:00.000Z	44 \| good	7.667 \| good	17.731 \| good	21.476 \| good	0.642 \| good	11.195 \| good	0.761 \| good
2026-11-13T00:00:00.000Z	44 \| good	8.087 \| good	11.426 \| good	20.11 \| good	0.51 \| good	9.157 \| good	0.152 \| good
2026-11-13T01:00:00.000Z	49 \| good	8.703 \| good	11.809 \| good	20.025 \| good	0.446 \| good	8.13 \| good	0.152 \| good
2026-11-13T02:00:00.000Z	49 \| good	9.255 \| good	11.617 \| good	19.922 \| good	0.43 \| good	7.493 \| good	0.152 \| good
2026-11-13T03:00:00.000Z	49 \| good	9.053 \| good	11.236 \| good	20.436 \| good	0.41 \| good	6.672 \| good	0.15 \| good
2026-11-13T04:00:00.000Z	49 \| good	8.785 \| good	11.091 \| good	20.774 \| good	0.392 \| good	5.869 \| good	0.148 \| good
2026-11-13T05:00:00.000Z	49 \| good	8.839 \| good	11.227 \| good	20.69 \| good	0.392 \| good	5.648 \| good	0.148 \| good
2026-11-13T06:00:00.000Z	49 \| good	9.169 \| good	12.042 \| good	19.929 \| good	0.447 \| good	6.236 \| good	0.149 \| good
2026-11-13T07:00:00.000Z	52 \| moderate	9.862 \| good	13.795 \| good	17.484 \| good	0.595 \| good	8.508 \| good	0.154 \| good
2026-11-13T08:00:00.000Z	54 \| moderate	10.592 \| good	15.59 \| good	14.881 \| good	0.696 \| good	12.353 \| good	0.164 \| good
2026-11-13T09:00:00.000Z	52 \| moderate	9.883 \| good	16.331 \| good	16.906 \| good	0.814 \| good	13.014 \| good	0.171 \| good
2026-11-13T10:00:00.000Z	44 \| good	8.445 \| good	15.347 \| good	19.792 \| good	0.721 \| good	10.528 \| good	0.164 \| good
2026-11-13T11:00:00.000Z	44 \| good	7.903 \| good	13.924 \| good	21.206 \| good	0.646 \| good	9.151 \| good	0.163 \| good
2026-11-13T12:00:00.000Z	38 \| good	6.569 \| good	11.737 \| good	23.562 \| good	0.588 \| good	8.26 \| good	0.16 \| good
2026-11-13T13:00:00.000Z	33 \| good	6.136 \| good	10.418 \| good	24.866 \| good	0.506 \| good	8.183 \| good	0.159 \| good
2026-11-13T14:00:00.000Z	33 \| good	5.91 \| good	9.823 \| good	24.906 \| good	0.511 \| good	8.552 \| good	0.163 \| good
2026-11-13T15:00:00.000Z	33 \| good	6.32 \| good	10.609 \| good	21.599 \| good	0.551 \| good	10.395 \| good	0.168 \| good
2026-11-13T16:00:00.000Z	44 \| good	7.871 \| good	12.6 \| good	16.32 \| good	0.598 \| good	16.419 \| good	0.18 \| good
2026-11-13T17:00:00.000Z	49 \| good	8.655 \| good	15.054 \| good	10.325 \| good	0.733 \| good	21.214 \| good	0.192 \| good
2026-11-13T18:00:00.000Z	54 \| moderate	11.336 \| good	17.34 \| good	4.304 \| good	0.763 \| good	26.397 \| good	0.213 \| good
2026-11-13T19:00:00.000Z	58 \| moderate	13.32 \| fine	19.044 \| good	1.929 \| good	0.891 \| good	26.754 \| good	0.225 \| good
2026-11-13T20:00:00.000Z	62 \| moderate	15.057 \| fine	20.118 \| good	0.474 \| good	0.975 \| good	26.728 \| good	0.234 \| good
2026-11-13T21:00:00.000Z	64 \| moderate	16.25 \| fine	20.487 \| good	0.521 \| good	0.983 \| good	25.357 \| good	0.233 \| good
2026-11-13T22:00:00.000Z	66 \| moderate	16.764 \| fine	20.481 \| good	0.793 \| good	1.051 \| good	23.632 \| good	0.226 \| good
2026-11-13T23:00:00.000Z	66 \| moderate	17.047 \| fine	20.836 \| good	0.966 \| good	1.034 \| good	22.53 \| good	0.223 \| good
2026-11-14T00:00:00.000Z	66 \| moderate	17.235 \| fine	21.082 \| good	1.15 \| good	0.951 \| good	22.078 \| good	0.22 \| good
2026-11-14T01:00:00.000Z	67 \| moderate	18.235 \| fine	22.487 \| good	1.698 \| good	0.932 \| good	20.973 \| good	0.22 \| good
2026-11-14T02:00:00.000Z	69 \| moderate	18.671 \| fine	23.729 \| good	2.56 \| good	0.87 \| good	19.732 \| good	0.222 \| good
2026-11-14T03:00:00.000Z	69 \| moderate	19.272 \| fine	23.475 \| good	3.181 \| good	0.828 \| good	19.665 \| good	0.221 \| good
2026-11-14T04:00:00.000Z	69 \| moderate	19.376 \| fine	23.536 \| good	3.107 \| good	0.818 \| good	19.801 \| good	0.222 \| good
2026-11-14T05:00:00.000Z	71 \| moderate	20.392 \| fine	25.116 \| good	2.365 \| good	0.856 \| good	20.803 \| good	0.228 \| good
2026-11-14T06:00:00.000Z	75 \| moderate	22.074 \| fine	24.988 \| good	1.495 \| good	0.898 \| good	23.45 \| good	0.244 \| good
2026-11-14T07:00:00.000Z	75 \| moderate	22.277 \| fine	26.166 \| good	0.718 \| good	1.055 \| good	26.299 \| good	0.26 \| good
2026-11-14T08:00:00.000Z	71 \| moderate	20.461 \| fine	26.645 \| good	0.49 \| good	1.24 \| good	27.892 \| good	0.275 \| good
2026-11-14T09:00:00.000Z	69 \| moderate	19.216 \| fine	25.203 \| good	3.264 \| good	1.162 \| good	24.739 \| good	0.258 \| good
2026-11-14T10:00:00.000Z	67 \| moderate	18.326 \| fine	21.526 \| good	7.599 \| good	1.196 \| good	21.849 \| good	0.25 \| good
2026-11-14T11:00:00.000Z	66 \| moderate	16.816 \| fine	20.325 \| good	12.168 \| good	1.301 \| good	18.631 \| good	0.23 \| good
2026-11-14T12:00:00.000Z	64 \| moderate	16.072 \| fine	20.575 \| good	14.231 \| good	1.256 \| good	17.928 \| good	0.221 \| good
2026-11-14T13:00:00.000Z	60 \| moderate	14.253 \| fine	20.295 \| good	17.291 \| good	0.88 \| good	15.648 \| good	0.207 \| good
2026-11-14T14:00:00.000Z	54 \| moderate	11.482 \| good	17.764 \| good	20.804 \| good	0.708 \| good	14.626 \| good	0.184 \| good
2026-11-14T15:00:00.000Z	49 \| good	8.954 \| good	13.468 \| good	19.361 \| good	0.628 \| good	13.968 \| good	0.178 \| good
2026-11-14T16:00:00.000Z	44 \| good	8.042 \| good	11.343 \| good	17.716 \| good	0.632 \| good	15.469 \| good	0.185 \| good
2026-11-14T17:00:00.000Z	49 \| good	8.992 \| good	12.702 \| good	13.66 \| good	0.61 \| good	18.213 \| good	0.189 \| good
2026-11-14T18:00:00.000Z	54 \| moderate	10.917 \| good	15.804 \| good	10.537 \| good	0.629 \| good	21.021 \| good	0.201 \| good
2026-11-14T19:00:00.000Z	56 \| moderate	11.895 \| good	16.373 \| good	10.837 \| good	0.749 \| good	20.306 \| good	0.203 \| good
2026-11-14T20:00:00.000Z	56 \| moderate	11.9 \| good	15.996 \| good	11.004 \| good	0.845 \| good	18.3 \| good	0.195 \| good
2026-11-14T21:00:00.000Z	56 \| moderate	12.068 \| good	17.01 \| good	10.866 \| good	0.78 \| good	16.568 \| good	0.182 \| good
2026-11-14T22:00:00.000Z	58 \| moderate	12.881 \| fine	15.517 \| good	10.698 \| good	0.707 \| good	15.255 \| good	0.178 \| good
2026-11-14T23:00:00.000Z	58 \| moderate	13.494 \| fine	15.958 \| good	10.718 \| good	0.701 \| good	15.744 \| good	0.18 \| 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
Cheshunt, Hertfordshire	38 Good	6.91μg/m³ Good	19.45μg/m³ Good	20.29ppb Good	0.66ppb Good	10.71ppb Good	0.76ppm Good
Hatfield, Hertfordshire	44 Good	7.97μg/m³ Good	16.00μg/m³ Good	20.36ppb Good	0.66ppb Good	7.13ppb Good	0.76ppm Good
Bushey, Hertfordshire	33 Good	6.14μg/m³ Good	14.71μg/m³ Good	22.25ppb Good	0.72ppb Good	14.62ppb Good	0.76ppm Good
Hemel Hempstead, Hertfordshire	44 Good	7.97μg/m³ Good	35.69μg/m³ Good	21.68ppb Good	0.67ppb Good	13.11ppb Good	0.76ppm Good
Borehamwood, Hertfordshire	38 Good	7.15μg/m³ Good	12.04μg/m³ Good	20.65ppb Good	0.67ppb Good	15.03ppb Good	0.76ppm Good
Rickmansworth, Hertfordshire	44 Good	7.93μg/m³ Good	12.40μg/m³ Good	20.12ppb Good	0.67ppb Good	8.53ppb Good	0.76ppm Good
Abbots Langley, Hertfordshire	44 Good	7.97μg/m³ Good	35.69μg/m³ Good	21.68ppb Good	0.67ppb Good	13.11ppb Good	0.76ppm Good
Baldock, Hertfordshire	44 Good	8.19μg/m³ Good	13.37μg/m³ Good	20.08ppb Good	0.63ppb Good	10.82ppb Good	0.76ppm Good
Bishop's Stortford, Hertfordshire	49 Good	8.82μg/m³ Good	13.31μg/m³ Good	24.35ppb Good	0.47ppb Good	12.48ppb Good	0.76ppm Good
Harpenden, Hertfordshire	38 Good	7.12μg/m³ Good	16.00μg/m³ Good	22.79ppb Good	0.66ppb Good	10.34ppb Good	0.76ppm Good
Hertford, Hertfordshire	44 Good	8.15μg/m³ Good	13.42μg/m³ Good	23.08ppb Good	0.64ppb Good	8.81ppb Good	0.76ppm Good
Berkhamsted, Hertfordshire	33 Good	5.64μg/m³ Good	20.47μg/m³ Good	22.67ppb Good	0.67ppb Good	12.88ppb Good	0.76ppm Good
Chorleywood, Hertfordshire	44 Good	7.93μg/m³ Good	12.40μg/m³ Good	20.12ppb Good	0.67ppb Good	8.53ppb Good	0.76ppm Good
Hoddesdon, Hertfordshire	44 Good	8.15μg/m³ Good	13.42μg/m³ Good	23.08ppb Good	0.64ppb Good	8.81ppb Good	0.76ppm Good
Letchworth, Hertfordshire	44 Good	7.99μg/m³ Good	15.97μg/m³ Good	20.66ppb Good	0.64ppb Good	7.24ppb Good	0.76ppm Good
Stevenage, Hertfordshire	44 Good	7.99μg/m³ Good	15.97μg/m³ Good	20.66ppb Good	0.64ppb Good	7.24ppb Good	0.76ppm Good
Hitchin, Hertfordshire	44 Good	7.99μg/m³ Good	15.97μg/m³ Good	20.66ppb Good	0.64ppb Good	7.24ppb Good	0.76ppm Good
Sawbridgeworth, Hertfordshire	49 Good	8.82μg/m³ Good	13.31μg/m³ Good	24.35ppb Good	0.47ppb Good	12.48ppb Good	0.76ppm Good
St Albans, Hertfordshire	38 Good	7.31μg/m³ Good	21.07μg/m³ Good	21.80ppb Good	0.70ppb Good	16.91ppb Good	0.76ppm Good
Royston, Hertfordshire	44 Good	8.19μg/m³ Good	13.25μg/m³ Good	20.78ppb Good	0.61ppb Good	12.06ppb Good	0.76ppm Good
Potters Bar, Hertfordshire	38 Good	7.00μg/m³ Good	12.89μg/m³ Good	19.52ppb Good	0.67ppb Good	9.65ppb Good	0.76ppm Good
Waltham Cross, Hertfordshire	38 Good	6.93μg/m³ Good	19.80μg/m³ Good	20.27ppb Good	0.66ppb Good	10.84ppb Good	0.76ppm Good
Watford, Hertfordshire	38 Good	6.58μg/m³ Good	12.00μg/m³ Good	21.27ppb Good	0.67ppb Good	15.00ppb Good	0.76ppm Good
Welwyn Garden City, Hertfordshire	44 Good	8.03μg/m³ Good	16.68μg/m³ Good	20.16ppb Good	0.65ppb Good	7.51ppb Good	0.76ppm Good
Tring, Hertfordshire	44 Good	7.70μg/m³ Good	32.98μg/m³ Good	22.75ppb Good	0.66ppb Good	19.48ppb Good	0.76ppm Good
Ware, Hertfordshire	49 Good	8.78μg/m³ Good	22.73μg/m³ Good	22.31ppb Good	0.56ppb Good	10.51ppb Good	0.76ppm Good

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

0.76ppm

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 11:00:00 on 2026-11-11.

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 09:00:00 on 2026-11-12.

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 7.667 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 17.731 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.761 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.642 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 21.476 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 11.195 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-11-11T00:00:00.000Z	67 \| moderate	18.084 \| fine	21.763 \| good	14.026 \| good	1.286 \| good	11.555 \| good	0.642 \| good
2026-11-11T01:00:00.000Z	62 \| moderate	14.707 \| fine	28.135 \| good	14.36 \| good	0.867 \| good	10.821 \| good	0.623 \| good
2026-11-11T02:00:00.000Z	54 \| moderate	11.207 \| good	21.275 \| good	13.906 \| good	0.861 \| good	8.309 \| good	0.623 \| good
2026-11-11T03:00:00.000Z	60 \| moderate	14.303 \| fine	34.061 \| good	17.058 \| good	0.853 \| good	9.139 \| good	0.623 \| good
2026-11-11T04:00:00.000Z	54 \| moderate	11.2 \| good	37.262 \| good	17.842 \| good	0.853 \| good	4.786 \| good	0.623 \| good
2026-11-11T05:00:00.000Z	54 \| moderate	10.8 \| good	37.645 \| good	19.676 \| good	0.863 \| good	4.99 \| good	0.623 \| good
2026-11-11T06:00:00.000Z	58 \| moderate	12.96 \| fine	26.54 \| good	18.867 \| good	0.852 \| good	7.535 \| good	0.623 \| good
2026-11-11T07:00:00.000Z	49 \| good	9.191 \| good	23.82 \| good	18.272 \| good	0.847 \| good	4.409 \| good	0.742 \| good
2026-11-11T08:00:00.000Z	56 \| moderate	12.359 \| fine	21.711 \| good	18.782 \| good	0.848 \| good	8.31 \| good	0.623 \| good
2026-11-11T09:00:00.000Z	58 \| moderate	13.233 \| fine	22.74 \| good	19.706 \| good	0.91 \| good	9.479 \| good	0.623 \| good
2026-11-11T10:00:00.000Z	52 \| moderate	9.66 \| good	27.3 \| good	17.167 \| good	0.901 \| good	9.972 \| good	0.623 \| good
2026-11-11T11:00:00.000Z	52 \| moderate	9.66 \| good	35.509 \| good	17.619 \| good	0.894 \| good	9.615 \| good	0.623 \| good
2026-11-11T12:00:00.000Z	66 \| moderate	17.169 \| fine	33.351 \| good	16.313 \| good	0.854 \| good	11.244 \| good	0.623 \| good
2026-11-11T13:00:00.000Z	56 \| moderate	12.427 \| fine	21.36 \| good	16.137 \| good	0.722 \| good	10.919 \| good	0.623 \| good
2026-11-11T14:00:00.000Z	18 \| good	2.4 \| good	11.15 \| good	18.589 \| good	0.602 \| good	10.749 \| good	0.623 \| good
2026-11-11T15:00:00.000Z	60 \| moderate	14.197 \| fine	14.374 \| good	20.725 \| good	1.259 \| good	7.431 \| good	0.623 \| good
2026-11-11T16:00:00.000Z	60 \| moderate	14.048 \| fine	35.15 \| good	16.248 \| good	0.713 \| good	10.04 \| good	0.743 \| good
2026-11-11T17:00:00.000Z	62 \| moderate	15.16 \| fine	32.119 \| good	20.656 \| good	0.916 \| good	13.529 \| good	0.702 \| good
2026-11-11T18:00:00.000Z	62 \| moderate	15.032 \| fine	32.956 \| good	16.884 \| good	0.855 \| good	15.285 \| good	0.682 \| good
2026-11-11T19:00:00.000Z	71 \| moderate	19.934 \| fine	36.934 \| good	17.93 \| good	0.937 \| good	13.71 \| good	0.722 \| good
2026-11-11T20:00:00.000Z	56 \| moderate	11.515 \| good	23.056 \| good	17.608 \| good	0.857 \| good	11.615 \| good	0.642 \| good
2026-11-11T21:00:00.000Z	22 \| good	4 \| good	18.315 \| good	18.978 \| good	0.905 \| good	9.417 \| good	0.642 \| good
2026-11-11T22:00:00.000Z	67 \| moderate	17.971 \| fine	19.54 \| good	19.258 \| good	0.83 \| good	13.341 \| good	0.642 \| good
2026-11-11T23:00:00.000Z	67 \| moderate	18.224 \| fine	25.83 \| good	15.28 \| good	0.832 \| good	10.516 \| good	0.623 \| good
2026-11-12T00:00:00.000Z	56 \| moderate	12.314 \| fine	40.826 \| good	15.205 \| good	0.767 \| good	9.956 \| good	0.623 \| good
2026-11-12T01:00:00.000Z	49 \| good	9.047 \| good	25.15 \| good	16.038 \| good	0.767 \| good	7.998 \| good	0.623 \| good
2026-11-12T02:00:00.000Z	49 \| good	8.865 \| good	16.802 \| good	16.894 \| good	0.763 \| good	7.38 \| good	0.623 \| good
2026-11-12T03:00:00.000Z	38 \| good	7.266 \| good	16.679 \| good	16.058 \| good	0.762 \| good	7.069 \| good	0.623 \| good
2026-11-12T04:00:00.000Z	44 \| good	8.032 \| good	23.134 \| good	17.087 \| good	0.764 \| good	8.434 \| good	0.623 \| good
2026-11-12T05:00:00.000Z	49 \| good	8.831 \| good	16.409 \| good	16.152 \| good	0.833 \| good	6.691 \| good	0.642 \| good
2026-11-12T06:00:00.000Z	44 \| good	8.44 \| good	17.2 \| good	18.714 \| good	0.836 \| good	8.057 \| good	0.662 \| good
2026-11-12T07:00:00.000Z	56 \| moderate	11.703 \| good	18.408 \| good	16.984 \| good	0.832 \| good	8.901 \| good	0.662 \| good
2026-11-12T08:00:00.000Z	44 \| good	8.343 \| good	17.12 \| good	10.495 \| good	0.972 \| good	12.109 \| good	0.682 \| good
2026-11-12T09:00:00.000Z	38 \| good	7.388 \| good	25.861 \| good	12.361 \| good	1.115 \| good	11.213 \| good	0.702 \| good
2026-11-12T10:00:00.000Z	44 \| good	7.637 \| good	22.78 \| good	15.029 \| good	1.028 \| good	14.631 \| good	0.702 \| good
2026-11-12T11:00:00.000Z	49 \| good	9.327 \| good	14.711 \| good	20.907 \| good	3.003 \| good	12.319 \| good	0.682 \| good
2026-11-12T12:00:00.000Z	49 \| good	8.993 \| good	33.964 \| good	18.944 \| good	3.121 \| good	10.201 \| good	0.682 \| good
2026-11-12T13:00:00.000Z	44 \| good	8.181 \| good	38.107 \| good	15.335 \| good	0.828 \| good	8.86 \| good	0.682 \| good
2026-11-12T14:00:00.000Z	49 \| good	9.054 \| good	19.09 \| good	15.414 \| good	0.711 \| good	8.272 \| good	0.682 \| good
2026-11-12T15:00:00.000Z	44 \| good	8.239 \| good	21.284 \| good	16.292 \| good	0.712 \| good	6.494 \| good	0.702 \| good
2026-11-12T16:00:00.000Z	49 \| good	8.573 \| good	25.043 \| good	22.513 \| good	0.695 \| good	7.666 \| good	0.761 \| good
2026-11-12T17:00:00.000Z	44 \| good	8.489 \| good	15.816 \| good	24.987 \| good	0.785 \| good	10.286 \| good	0.826 \| good
2026-11-12T18:00:00.000Z	44 \| good	7.913 \| good	36.346 \| good	24.96 \| good	0.791 \| good	13.815 \| good	0.761 \| good
2026-11-12T19:00:00.000Z	44 \| good	8.32 \| good	19.474 \| good	24.117 \| good	0.655 \| good	11.654 \| good	0.781 \| good
2026-11-12T20:00:00.000Z	49 \| good	9.374 \| good	13.592 \| good	22.669 \| good	0.717 \| good	9.132 \| good	0.781 \| good
2026-11-12T21:00:00.000Z	49 \| good	9.137 \| good	17.843 \| good	21.37 \| good	0.652 \| good	9.779 \| good	0.801 \| good
2026-11-12T22:00:00.000Z	44 \| good	7.972 \| good	16 \| good	20.364 \| good	0.656 \| good	7.129 \| good	0.761 \| good
2026-11-12T23:00:00.000Z	44 \| good	7.667 \| good	17.731 \| good	21.476 \| good	0.642 \| good	11.195 \| good	0.761 \| good
2026-11-13T00:00:00.000Z	44 \| good	8.087 \| good	11.426 \| good	20.11 \| good	0.51 \| good	9.157 \| good	0.152 \| good
2026-11-13T01:00:00.000Z	49 \| good	8.703 \| good	11.809 \| good	20.025 \| good	0.446 \| good	8.13 \| good	0.152 \| good
2026-11-13T02:00:00.000Z	49 \| good	9.255 \| good	11.617 \| good	19.922 \| good	0.43 \| good	7.493 \| good	0.152 \| good
2026-11-13T03:00:00.000Z	49 \| good	9.053 \| good	11.236 \| good	20.436 \| good	0.41 \| good	6.672 \| good	0.15 \| good
2026-11-13T04:00:00.000Z	49 \| good	8.785 \| good	11.091 \| good	20.774 \| good	0.392 \| good	5.869 \| good	0.148 \| good
2026-11-13T05:00:00.000Z	49 \| good	8.839 \| good	11.227 \| good	20.69 \| good	0.392 \| good	5.648 \| good	0.148 \| good
2026-11-13T06:00:00.000Z	49 \| good	9.169 \| good	12.042 \| good	19.929 \| good	0.447 \| good	6.236 \| good	0.149 \| good
2026-11-13T07:00:00.000Z	52 \| moderate	9.862 \| good	13.795 \| good	17.484 \| good	0.595 \| good	8.508 \| good	0.154 \| good
2026-11-13T08:00:00.000Z	54 \| moderate	10.592 \| good	15.59 \| good	14.881 \| good	0.696 \| good	12.353 \| good	0.164 \| good
2026-11-13T09:00:00.000Z	52 \| moderate	9.883 \| good	16.331 \| good	16.906 \| good	0.814 \| good	13.014 \| good	0.171 \| good
2026-11-13T10:00:00.000Z	44 \| good	8.445 \| good	15.347 \| good	19.792 \| good	0.721 \| good	10.528 \| good	0.164 \| good
2026-11-13T11:00:00.000Z	44 \| good	7.903 \| good	13.924 \| good	21.206 \| good	0.646 \| good	9.151 \| good	0.163 \| good
2026-11-13T12:00:00.000Z	38 \| good	6.569 \| good	11.737 \| good	23.562 \| good	0.588 \| good	8.26 \| good	0.16 \| good
2026-11-13T13:00:00.000Z	33 \| good	6.136 \| good	10.418 \| good	24.866 \| good	0.506 \| good	8.183 \| good	0.159 \| good
2026-11-13T14:00:00.000Z	33 \| good	5.91 \| good	9.823 \| good	24.906 \| good	0.511 \| good	8.552 \| good	0.163 \| good
2026-11-13T15:00:00.000Z	33 \| good	6.32 \| good	10.609 \| good	21.599 \| good	0.551 \| good	10.395 \| good	0.168 \| good
2026-11-13T16:00:00.000Z	44 \| good	7.871 \| good	12.6 \| good	16.32 \| good	0.598 \| good	16.419 \| good	0.18 \| good
2026-11-13T17:00:00.000Z	49 \| good	8.655 \| good	15.054 \| good	10.325 \| good	0.733 \| good	21.214 \| good	0.192 \| good
2026-11-13T18:00:00.000Z	54 \| moderate	11.336 \| good	17.34 \| good	4.304 \| good	0.763 \| good	26.397 \| good	0.213 \| good
2026-11-13T19:00:00.000Z	58 \| moderate	13.32 \| fine	19.044 \| good	1.929 \| good	0.891 \| good	26.754 \| good	0.225 \| good
2026-11-13T20:00:00.000Z	62 \| moderate	15.057 \| fine	20.118 \| good	0.474 \| good	0.975 \| good	26.728 \| good	0.234 \| good
2026-11-13T21:00:00.000Z	64 \| moderate	16.25 \| fine	20.487 \| good	0.521 \| good	0.983 \| good	25.357 \| good	0.233 \| good
2026-11-13T22:00:00.000Z	66 \| moderate	16.764 \| fine	20.481 \| good	0.793 \| good	1.051 \| good	23.632 \| good	0.226 \| good
2026-11-13T23:00:00.000Z	66 \| moderate	17.047 \| fine	20.836 \| good	0.966 \| good	1.034 \| good	22.53 \| good	0.223 \| good
2026-11-14T00:00:00.000Z	66 \| moderate	17.235 \| fine	21.082 \| good	1.15 \| good	0.951 \| good	22.078 \| good	0.22 \| good
2026-11-14T01:00:00.000Z	67 \| moderate	18.235 \| fine	22.487 \| good	1.698 \| good	0.932 \| good	20.973 \| good	0.22 \| good
2026-11-14T02:00:00.000Z	69 \| moderate	18.671 \| fine	23.729 \| good	2.56 \| good	0.87 \| good	19.732 \| good	0.222 \| good
2026-11-14T03:00:00.000Z	69 \| moderate	19.272 \| fine	23.475 \| good	3.181 \| good	0.828 \| good	19.665 \| good	0.221 \| good
2026-11-14T04:00:00.000Z	69 \| moderate	19.376 \| fine	23.536 \| good	3.107 \| good	0.818 \| good	19.801 \| good	0.222 \| good
2026-11-14T05:00:00.000Z	71 \| moderate	20.392 \| fine	25.116 \| good	2.365 \| good	0.856 \| good	20.803 \| good	0.228 \| good
2026-11-14T06:00:00.000Z	75 \| moderate	22.074 \| fine	24.988 \| good	1.495 \| good	0.898 \| good	23.45 \| good	0.244 \| good
2026-11-14T07:00:00.000Z	75 \| moderate	22.277 \| fine	26.166 \| good	0.718 \| good	1.055 \| good	26.299 \| good	0.26 \| good
2026-11-14T08:00:00.000Z	71 \| moderate	20.461 \| fine	26.645 \| good	0.49 \| good	1.24 \| good	27.892 \| good	0.275 \| good
2026-11-14T09:00:00.000Z	69 \| moderate	19.216 \| fine	25.203 \| good	3.264 \| good	1.162 \| good	24.739 \| good	0.258 \| good
2026-11-14T10:00:00.000Z	67 \| moderate	18.326 \| fine	21.526 \| good	7.599 \| good	1.196 \| good	21.849 \| good	0.25 \| good
2026-11-14T11:00:00.000Z	66 \| moderate	16.816 \| fine	20.325 \| good	12.168 \| good	1.301 \| good	18.631 \| good	0.23 \| good
2026-11-14T12:00:00.000Z	64 \| moderate	16.072 \| fine	20.575 \| good	14.231 \| good	1.256 \| good	17.928 \| good	0.221 \| good
2026-11-14T13:00:00.000Z	60 \| moderate	14.253 \| fine	20.295 \| good	17.291 \| good	0.88 \| good	15.648 \| good	0.207 \| good
2026-11-14T14:00:00.000Z	54 \| moderate	11.482 \| good	17.764 \| good	20.804 \| good	0.708 \| good	14.626 \| good	0.184 \| good
2026-11-14T15:00:00.000Z	49 \| good	8.954 \| good	13.468 \| good	19.361 \| good	0.628 \| good	13.968 \| good	0.178 \| good
2026-11-14T16:00:00.000Z	44 \| good	8.042 \| good	11.343 \| good	17.716 \| good	0.632 \| good	15.469 \| good	0.185 \| good
2026-11-14T17:00:00.000Z	49 \| good	8.992 \| good	12.702 \| good	13.66 \| good	0.61 \| good	18.213 \| good	0.189 \| good
2026-11-14T18:00:00.000Z	54 \| moderate	10.917 \| good	15.804 \| good	10.537 \| good	0.629 \| good	21.021 \| good	0.201 \| good
2026-11-14T19:00:00.000Z	56 \| moderate	11.895 \| good	16.373 \| good	10.837 \| good	0.749 \| good	20.306 \| good	0.203 \| good
2026-11-14T20:00:00.000Z	56 \| moderate	11.9 \| good	15.996 \| good	11.004 \| good	0.845 \| good	18.3 \| good	0.195 \| good
2026-11-14T21:00:00.000Z	56 \| moderate	12.068 \| good	17.01 \| good	10.866 \| good	0.78 \| good	16.568 \| good	0.182 \| good
2026-11-14T22:00:00.000Z	58 \| moderate	12.881 \| fine	15.517 \| good	10.698 \| good	0.707 \| good	15.255 \| good	0.178 \| good
2026-11-14T23:00:00.000Z	58 \| moderate	13.494 \| fine	15.958 \| good	10.718 \| good	0.701 \| good	15.744 \| good	0.18 \| 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?