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

The current PM10 concentration at Hertfordshire, UK is 12.655 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.956 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 19.929 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 18.237 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 6.338 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)

7.55 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

19.77 μg/m³

155

255

425

605+

Ozone (O₃)

21.37 ppb

201

201+

Sulfur Dioxide (SO₂)

0.86 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

14.25 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.80 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

Hertfordshire, UK

Get Live Pollen Counts

Hertfordshire, UK

Scroll To Air Quality Map

Track live Hertfordshire, UK air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-02-10T02:00:00.000Z	54 \| moderate	11.409 \| good	22.139 \| good	22.246 \| good	0.664 \| good	5.479 \| good	0.493 \| good
2026-02-10T03:00:00.000Z	52 \| moderate	10.444 \| good	16.595 \| good	16.757 \| good	0.721 \| good	7.783 \| good	0.522 \| good
2026-02-10T04:00:00.000Z	49 \| good	8.825 \| good	23.042 \| good	21.069 \| good	0.671 \| good	8.346 \| good	0.473 \| good
2026-02-10T05:00:00.000Z	54 \| moderate	10.875 \| good	31.956 \| good	20.707 \| good	0.678 \| good	7.309 \| good	0.478 \| good
2026-02-10T06:00:00.000Z	44 \| good	8.145 \| good	24.319 \| good	16.385 \| good	0.75 \| good	4.114 \| good	0.007 \| good
2026-02-10T07:00:00.000Z	38 \| good	6.67 \| good	15.468 \| good	19.365 \| good	0.825 \| good	3.479 \| good	0.008 \| good
2026-02-10T08:00:00.000Z	54 \| moderate	11.248 \| good	30.801 \| good	16.826 \| good	0.752 \| good	11.982 \| good	0.011 \| good
2026-02-10T09:00:00.000Z	49 \| good	9.282 \| good	18.033 \| good	16.305 \| good	0.858 \| good	5.16 \| good	0.012 \| good
2026-02-10T10:00:00.000Z	56 \| moderate	12.219 \| fine	15.94 \| good	14.101 \| good	0.763 \| good	9.489 \| good	0.009 \| good
2026-02-10T11:00:00.000Z	52 \| moderate	9.919 \| good	12.082 \| good	14.823 \| good	0.811 \| good	9.186 \| good	0.009 \| good
2026-02-10T12:00:00.000Z	54 \| moderate	11.456 \| good	26.12 \| good	15.094 \| good	0.805 \| good	11.199 \| good	0.007 \| good
2026-02-10T13:00:00.000Z	58 \| moderate	13.369 \| fine	22.221 \| good	14.919 \| good	0.763 \| good	9.586 \| good	0.007 \| good
2026-02-10T14:00:00.000Z	58 \| moderate	13.016 \| fine	31.185 \| good	19.259 \| good	0.806 \| good	7.761 \| good	0.009 \| good
2026-02-10T15:00:00.000Z	52 \| moderate	9.549 \| good	12.465 \| good	14.184 \| good	0.878 \| good	4.809 \| good	0.008 \| good
2026-02-10T16:00:00.000Z	44 \| good	7.547 \| good	21.84 \| good	22.514 \| good	0.762 \| good	8.064 \| good	0.008 \| good
2026-02-10T17:00:00.000Z	33 \| good	6.053 \| good	12.707 \| good	25.287 \| good	0.727 \| good	6.351 \| good	0.009 \| good
2026-02-10T18:00:00.000Z	49 \| good	9.217 \| good	11.866 \| good	20.543 \| good	0.726 \| good	17.22 \| good	0.01 \| good
2026-02-10T19:00:00.000Z	52 \| moderate	9.957 \| good	35.432 \| good	19.941 \| good	0.743 \| good	8.894 \| good	0.013 \| good
2026-02-10T20:00:00.000Z	52 \| moderate	9.569 \| good	29.17 \| good	19.301 \| good	0.748 \| good	14.136 \| good	0.014 \| good
2026-02-10T21:00:00.000Z	56 \| moderate	12.028 \| good	22.423 \| good	15.545 \| good	0.765 \| good	10.328 \| good	0.015 \| good
2026-02-10T22:00:00.000Z	44 \| good	8.42 \| good	31.76 \| good	17.324 \| good	0.918 \| good	9.266 \| good	0.014 \| good
2026-02-10T23:00:00.000Z	38 \| good	6.919 \| good	29.813 \| good	16.682 \| good	0.912 \| good	6.373 \| good	0.013 \| good
2026-02-11T00:00:00.000Z	49 \| good	9.453 \| good	22.68 \| good	18.974 \| good	0.91 \| good	16.09 \| good	0.817 \| good
2026-02-11T01:00:00.000Z	44 \| good	8.197 \| good	32.67 \| good	15.173 \| good	0.95 \| good	20.277 \| good	0.781 \| good
2026-02-11T02:00:00.000Z	52 \| moderate	10.282 \| good	21.674 \| good	19.319 \| good	0.926 \| good	19.223 \| good	0.67 \| good
2026-02-11T03:00:00.000Z	54 \| moderate	10.6 \| good	23.976 \| good	19.429 \| good	0.904 \| good	14.415 \| good	0.514 \| good
2026-02-11T04:00:00.000Z	52 \| moderate	9.632 \| good	25.143 \| good	17.512 \| good	0.863 \| good	18.719 \| good	0.465 \| good
2026-02-11T05:00:00.000Z	49 \| good	8.946 \| good	27.517 \| good	21.407 \| good	0.859 \| good	14.961 \| good	0.378 \| good
2026-02-11T06:00:00.000Z	38 \| good	7.158 \| good	11.4 \| good	17.488 \| good	0.84 \| good	18.766 \| good	0.009 \| good
2026-02-11T07:00:00.000Z	44 \| good	7.893 \| good	16.788 \| good	18.015 \| good	0.859 \| good	7.765 \| good	0.01 \| good
2026-02-11T08:00:00.000Z	33 \| good	5.911 \| good	28.799 \| good	12.933 \| good	0.926 \| good	7.207 \| good	0.012 \| good
2026-02-11T09:00:00.000Z	22 \| good	4.462 \| good	15.88 \| good	15.282 \| good	1.01 \| good	9.451 \| good	0.011 \| good
2026-02-11T10:00:00.000Z	49 \| good	8.672 \| good	16.727 \| good	15.281 \| good	0.921 \| good	8.298 \| good	0.012 \| good
2026-02-11T11:00:00.000Z	24 \| good	4.268 \| good	7.153 \| good	26.084 \| good	0.949 \| good	8.547 \| good	0.012 \| good
2026-02-11T12:00:00.000Z	44 \| good	7.506 \| good	15.724 \| good	20.065 \| good	1.009 \| good	6.509 \| good	0.006 \| good
2026-02-11T13:00:00.000Z	38 \| good	6.725 \| good	14.32 \| good	24.497 \| good	0.925 \| good	5.798 \| good	0.006 \| good
2026-02-11T14:00:00.000Z	27 \| good	5.428 \| good	20.307 \| good	19.106 \| good	2.131 \| good	6.502 \| good	0.006 \| good
2026-02-11T15:00:00.000Z	38 \| good	6.811 \| good	23.862 \| good	22.643 \| good	1.152 \| good	5.229 \| good	0.007 \| good
2026-02-11T16:00:00.000Z	44 \| good	7.535 \| good	25.846 \| good	15.634 \| good	0.996 \| good	6.871 \| good	0.008 \| good
2026-02-11T17:00:00.000Z	33 \| good	6.465 \| good	35.078 \| good	24.198 \| good	0.983 \| good	6.652 \| good	0.009 \| good
2026-02-11T18:00:00.000Z	27 \| good	4.66 \| good	22.751 \| good	25.961 \| good	1.11 \| good	14.665 \| good	0.012 \| good
2026-02-11T19:00:00.000Z	33 \| good	5.98 \| good	23.351 \| good	26.411 \| good	0.945 \| good	15.823 \| good	0.015 \| good
2026-02-11T20:00:00.000Z	38 \| good	7.221 \| good	18.771 \| good	24.134 \| good	0.851 \| good	15.212 \| good	0.019 \| good
2026-02-11T21:00:00.000Z	38 \| good	6.73 \| good	14.778 \| good	28.951 \| good	0.864 \| good	17.147 \| good	0.016 \| good
2026-02-11T22:00:00.000Z	38 \| good	6.683 \| good	25.395 \| good	22.938 \| good	0.946 \| good	15.273 \| good	0.02 \| good
2026-02-11T23:00:00.000Z	52 \| moderate	10.304 \| good	22.856 \| good	20.544 \| good	0.949 \| good	23.968 \| good	0.019 \| good
2026-02-12T00:00:00.000Z	49 \| good	9.478 \| good	22.298 \| good	27.283 \| good	0.951 \| good	22.269 \| good	1.009 \| good
2026-02-12T01:00:00.000Z	38 \| good	7.442 \| good	15.657 \| good	19.224 \| good	0.864 \| good	14.342 \| good	0.803 \| good
2026-02-12T01:00:00.000Z	44 \| good	7.552 \| good	19.766 \| good	21.37 \| good	0.862 \| good	14.251 \| good	0.803 \| good
2026-02-12T00:00:00.000Z	52 \| moderate	10.157 \| good	12.214 \| good	18.409 \| good	0.525 \| good	15.976 \| good	0.167 \| good
2026-02-12T01:00:00.000Z	52 \| moderate	10.299 \| good	12.661 \| good	19.539 \| good	0.434 \| good	13.353 \| good	0.167 \| good
2026-02-12T02:00:00.000Z	52 \| moderate	10.386 \| good	13.665 \| good	18.925 \| good	0.363 \| good	10.688 \| good	0.158 \| good
2026-02-12T03:00:00.000Z	54 \| moderate	11.31 \| good	13.907 \| good	19.496 \| good	0.348 \| good	7.817 \| good	0.15 \| good
2026-02-12T04:00:00.000Z	52 \| moderate	10.237 \| good	13.574 \| good	19.968 \| good	0.282 \| good	5.989 \| good	0.143 \| good
2026-02-12T05:00:00.000Z	52 \| moderate	9.533 \| good	12.028 \| good	20.774 \| good	0.261 \| good	4.904 \| good	0.143 \| good
2026-02-12T06:00:00.000Z	52 \| moderate	9.546 \| good	11.62 \| good	23.194 \| good	0.293 \| good	4.703 \| good	0.141 \| good
2026-02-12T07:00:00.000Z	52 \| moderate	9.714 \| good	13.051 \| good	22.935 \| good	0.386 \| good	6.977 \| good	0.148 \| good
2026-02-12T08:00:00.000Z	52 \| moderate	10.359 \| good	15.934 \| good	19.99 \| good	0.44 \| good	9.63 \| good	0.153 \| good
2026-02-12T09:00:00.000Z	52 \| moderate	9.699 \| good	13.308 \| good	21.574 \| good	0.421 \| good	10.302 \| good	0.153 \| good
2026-02-12T10:00:00.000Z	49 \| good	9.074 \| good	14.001 \| good	23.054 \| good	0.396 \| good	9.104 \| good	0.148 \| good
2026-02-12T11:00:00.000Z	49 \| good	8.736 \| good	12.996 \| good	25.598 \| good	0.397 \| good	7.912 \| good	0.146 \| good
2026-02-12T12:00:00.000Z	49 \| good	8.67 \| good	11.515 \| good	22.607 \| good	0.403 \| good	7.377 \| good	0.157 \| good
2026-02-12T13:00:00.000Z	44 \| good	8.036 \| good	9.03 \| good	17.609 \| good	0.384 \| good	7.612 \| good	0.176 \| good
2026-02-12T14:00:00.000Z	38 \| good	7.19 \| good	7.63 \| good	13.847 \| good	0.352 \| good	7.755 \| good	0.211 \| good
2026-02-12T15:00:00.000Z	33 \| good	5.53 \| good	6.824 \| good	11.757 \| good	0.333 \| good	7.761 \| good	0.225 \| good
2026-02-12T16:00:00.000Z	27 \| good	5.133 \| good	6.496 \| good	12.318 \| good	0.319 \| good	7.326 \| good	0.225 \| good
2026-02-12T17:00:00.000Z	27 \| good	5.364 \| good	6.881 \| good	13.296 \| good	0.378 \| good	7.855 \| good	0.235 \| good
2026-02-12T18:00:00.000Z	33 \| good	6.333 \| good	8.329 \| good	13.405 \| good	0.494 \| good	8.556 \| good	0.239 \| good
2026-02-12T19:00:00.000Z	38 \| good	6.821 \| good	8.615 \| good	12.329 \| good	0.492 \| good	8.63 \| good	0.242 \| good
2026-02-12T20:00:00.000Z	38 \| good	7.225 \| good	8.991 \| good	12.434 \| good	0.406 \| good	7.709 \| good	0.237 \| good
2026-02-12T21:00:00.000Z	38 \| good	6.665 \| good	8.816 \| good	12.938 \| good	0.404 \| good	6.839 \| good	0.237 \| good
2026-02-12T22:00:00.000Z	38 \| good	6.683 \| good	8.488 \| good	14.217 \| good	0.438 \| good	6.091 \| good	0.232 \| good
2026-02-12T23:00:00.000Z	38 \| good	7.027 \| good	8.972 \| good	15.434 \| good	0.385 \| good	5.344 \| good	0.218 \| good
2026-02-13T00:00:00.000Z	38 \| good	7.277 \| good	8.957 \| good	16.532 \| good	0.296 \| good	4.618 \| good	0.209 \| good
2026-02-13T01:00:00.000Z	38 \| good	6.672 \| good	8.048 \| good	18.218 \| good	0.194 \| good	3.811 \| good	0.2 \| good
2026-02-13T02:00:00.000Z	33 \| good	5.644 \| good	6.664 \| good	18.785 \| good	0.142 \| good	3.001 \| good	0.19 \| good
2026-02-13T03:00:00.000Z	27 \| good	5.061 \| good	5.835 \| good	19.374 \| good	0.128 \| good	2.614 \| good	0.179 \| good
2026-02-13T04:00:00.000Z	22 \| good	4.218 \| good	5.421 \| good	21.66 \| good	0.107 \| good	2.247 \| good	0.168 \| good
2026-02-13T05:00:00.000Z	22 \| good	3.558 \| good	5.199 \| good	22.64 \| good	0.114 \| good	1.741 \| good	0.157 \| good
2026-02-13T06:00:00.000Z	21 \| good	3.181 \| good	4.82 \| good	23.363 \| good	0.167 \| good	1.914 \| good	0.155 \| good
2026-02-13T07:00:00.000Z	24 \| good	3.104 \| good	4.484 \| good	25.928 \| good	0.191 \| good	2.411 \| good	0.154 \| good
2026-02-13T08:00:00.000Z	26 \| good	3.114 \| good	4.696 \| good	27.716 \| good	0.245 \| good	3.108 \| good	0.155 \| good
2026-02-13T09:00:00.000Z	28 \| good	3.218 \| good	4.765 \| good	29.835 \| good	0.257 \| good	3.339 \| good	0.157 \| good
2026-02-13T10:00:00.000Z	30 \| good	3.336 \| good	4.92 \| good	31.63 \| good	0.231 \| good	3.081 \| good	0.155 \| good
2026-02-13T11:00:00.000Z	31 \| good	3.354 \| good	4.883 \| good	32.851 \| good	0.203 \| good	2.646 \| good	0.151 \| good
2026-02-13T12:00:00.000Z	31 \| good	3.221 \| good	4.853 \| good	34.449 \| good	0.181 \| good	2.227 \| good	0.147 \| good
2026-02-13T13:00:00.000Z	33 \| good	3.308 \| good	5.713 \| good	36.018 \| good	0.171 \| good	1.933 \| good	0.143 \| good
2026-02-13T14:00:00.000Z	34 \| good	2.928 \| good	5.758 \| good	37.32 \| good	0.161 \| good	1.804 \| good	0.14 \| good
2026-02-13T15:00:00.000Z	35 \| good	2.96 \| good	5.712 \| good	38.407 \| good	0.163 \| good	2.104 \| good	0.139 \| good
2026-02-13T16:00:00.000Z	35 \| good	2.856 \| good	6.075 \| good	37.983 \| good	0.166 \| good	2.54 \| good	0.141 \| good
2026-02-13T17:00:00.000Z	35 \| good	3.057 \| good	6.782 \| good	38.169 \| good	0.223 \| good	3.255 \| good	0.143 \| good
2026-02-13T18:00:00.000Z	33 \| good	3.286 \| good	7.353 \| good	35.722 \| good	0.268 \| good	3.497 \| good	0.147 \| good
2026-02-13T19:00:00.000Z	31 \| good	3.532 \| good	7.391 \| good	34.092 \| good	0.299 \| good	3.623 \| good	0.148 \| good
2026-02-13T20:00:00.000Z	32 \| good	3.752 \| good	7.366 \| good	35.051 \| good	0.319 \| good	3.483 \| good	0.145 \| good
2026-02-13T21:00:00.000Z	31 \| good	3.375 \| good	6.004 \| good	34.238 \| good	0.399 \| good	3.128 \| good	0.144 \| good
2026-02-13T22:00:00.000Z	32 \| good	3.364 \| good	6.073 \| good	35.175 \| good	0.503 \| good	3.258 \| good	0.143 \| good
2026-02-13T23:00:00.000Z	32 \| good	3.516 \| good	5.51 \| good	34.84 \| good	0.433 \| good	3.336 \| good	0.143 \| 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
Welwyn Garden City, Hertfordshire	52 Moderate	10.30μg/m³ Good	22.86μg/m³ Good	20.54ppb Good	0.95ppb Good	23.97ppb Good	0.02ppm Good
Bishop's Stortford, Hertfordshire	49 Good	9.30μg/m³ Good	10.20μg/m³ Good	20.89ppb Good	1.01ppb Good	12.23ppb Good	0.03ppm Good
Sawbridgeworth, Hertfordshire	49 Good	9.30μg/m³ Good	10.20μg/m³ Good	20.89ppb Good	1.01ppb Good	12.23ppb Good	0.03ppm Good
Waltham Cross, Hertfordshire	49 Good	9.07μg/m³ Good	16.33μg/m³ Good	16.81ppb Good	0.93ppb Good	15.86ppb Good	0.01ppm Good
Cheshunt, Hertfordshire	49 Good	8.94μg/m³ Good	16.67μg/m³ Good	15.95ppb Good	0.93ppb Good	18.75ppb Good	0.01ppm Good
Hatfield, Hertfordshire	49 Good	8.74μg/m³ Good	15.82μg/m³ Good	21.39ppb Good	0.96ppb Good	20.47ppb Good	0.01ppm Good
Hoddesdon, Hertfordshire	49 Good	8.79μg/m³ Good	17.01μg/m³ Good	15.05ppb Good	0.94ppb Good	20.96ppb Good	0.01ppm Good
Potters Bar, Hertfordshire	49 Good	8.69μg/m³ Good	12.78μg/m³ Good	18.83ppb Good	0.93ppb Good	18.81ppb Good	0.01ppm Good
Harpenden, Hertfordshire	49 Good	8.63μg/m³ Good	18.23μg/m³ Good	21.69ppb Good	0.95ppb Good	17.85ppb Good	0.02ppm Good
Ware, Hertfordshire	44 Good	8.22μg/m³ Good	8.75μg/m³ Good	13.80ppb Good	0.95ppb Good	15.19ppb Good	0.02ppm Good
Hemel Hempstead, Hertfordshire	38 Good	7.17μg/m³ Good	11.00μg/m³ Good	22.10ppb Good	0.95ppb Good	21.62ppb Good	0.02ppm Good
Abbots Langley, Hertfordshire	38 Good	7.17μg/m³ Good	11.00μg/m³ Good	22.10ppb Good	0.95ppb Good	21.62ppb Good	0.02ppm Good
Watford, Hertfordshire	38 Good	7.14μg/m³ Good	11.00μg/m³ Good	20.67ppb Good	0.96ppb Good	17.85ppb Good	0.01ppm Good
Berkhamsted, Hertfordshire	38 Good	6.68μg/m³ Good	10.91μg/m³ Good	24.61ppb Good	0.95ppb Good	13.20ppb Good	0.03ppm Good
Royston, Hertfordshire	33 Good	6.42μg/m³ Good	17.07μg/m³ Good	14.00ppb Good	0.97ppb Good	11.70ppb Good	0.03ppm Good
Borehamwood, Hertfordshire	27 Good	4.97μg/m³ Good	8.53μg/m³ Good	21.79ppb Good	0.95ppb Good	17.00ppb Good	0.01ppm Good
St Albans, Hertfordshire	27 Good	4.79μg/m³ Good	12.23μg/m³ Good	22.19ppb Good	0.97ppb Good	20.72ppb Good	0.01ppm Good
Rickmansworth, Hertfordshire	27 Good	4.62μg/m³ Good	11.00μg/m³ Good	13.68ppb Good	0.96ppb Good	25.32ppb Good	0.02ppm Good
Chorleywood, Hertfordshire	27 Good	4.62μg/m³ Good	11.00μg/m³ Good	13.68ppb Good	0.96ppb Good	25.32ppb Good	0.02ppm Good
Bushey, Hertfordshire	22 Good	4.30μg/m³ Good	10.74μg/m³ Good	22.14ppb Good	0.99ppb Good	19.87ppb Good	0.00ppm Good
Hertford, Hertfordshire	24 Good	1.40μg/m³ Good	7.44μg/m³ Good	25.59ppb Good	0.96ppb Good	17.85ppb Good	0.02ppm Good
Baldock, Hertfordshire	21 Good	1.60μg/m³ Good	8.82μg/m³ Good	23.25ppb Good	0.94ppb Good	17.85ppb Good	0.03ppm Good
Letchworth, Hertfordshire	21 Good	1.60μg/m³ Good	8.82μg/m³ Good	23.25ppb Good	0.94ppb Good	17.85ppb Good	0.03ppm Good
Stevenage, Hertfordshire	21 Good	1.60μg/m³ Good	8.82μg/m³ Good	23.25ppb Good	0.94ppb Good	17.85ppb Good	0.03ppm Good
Hitchin, Hertfordshire	21 Good	1.60μg/m³ Good	8.82μg/m³ Good	23.25ppb Good	0.94ppb Good	17.85ppb Good	0.03ppm Good
Tring, Hertfordshire	49 Good	9.13μg/m³ Good	22.97μg/m³ Good	16.77ppb Good	0.94ppb Good	14.38ppb Good	0.03ppm Good

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

0.04ppm

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 03:00:00 on 2026-02-11.

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 2026-02-11.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 33, 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 6.338 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 12.655 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.018 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.956 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 19.929 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 18.237 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-02-10T02:00:00.000Z	54 \| moderate	11.409 \| good	22.139 \| good	22.246 \| good	0.664 \| good	5.479 \| good	0.493 \| good
2026-02-10T03:00:00.000Z	52 \| moderate	10.444 \| good	16.595 \| good	16.757 \| good	0.721 \| good	7.783 \| good	0.522 \| good
2026-02-10T04:00:00.000Z	49 \| good	8.825 \| good	23.042 \| good	21.069 \| good	0.671 \| good	8.346 \| good	0.473 \| good
2026-02-10T05:00:00.000Z	54 \| moderate	10.875 \| good	31.956 \| good	20.707 \| good	0.678 \| good	7.309 \| good	0.478 \| good
2026-02-10T06:00:00.000Z	44 \| good	8.145 \| good	24.319 \| good	16.385 \| good	0.75 \| good	4.114 \| good	0.007 \| good
2026-02-10T07:00:00.000Z	38 \| good	6.67 \| good	15.468 \| good	19.365 \| good	0.825 \| good	3.479 \| good	0.008 \| good
2026-02-10T08:00:00.000Z	54 \| moderate	11.248 \| good	30.801 \| good	16.826 \| good	0.752 \| good	11.982 \| good	0.011 \| good
2026-02-10T09:00:00.000Z	49 \| good	9.282 \| good	18.033 \| good	16.305 \| good	0.858 \| good	5.16 \| good	0.012 \| good
2026-02-10T10:00:00.000Z	56 \| moderate	12.219 \| fine	15.94 \| good	14.101 \| good	0.763 \| good	9.489 \| good	0.009 \| good
2026-02-10T11:00:00.000Z	52 \| moderate	9.919 \| good	12.082 \| good	14.823 \| good	0.811 \| good	9.186 \| good	0.009 \| good
2026-02-10T12:00:00.000Z	54 \| moderate	11.456 \| good	26.12 \| good	15.094 \| good	0.805 \| good	11.199 \| good	0.007 \| good
2026-02-10T13:00:00.000Z	58 \| moderate	13.369 \| fine	22.221 \| good	14.919 \| good	0.763 \| good	9.586 \| good	0.007 \| good
2026-02-10T14:00:00.000Z	58 \| moderate	13.016 \| fine	31.185 \| good	19.259 \| good	0.806 \| good	7.761 \| good	0.009 \| good
2026-02-10T15:00:00.000Z	52 \| moderate	9.549 \| good	12.465 \| good	14.184 \| good	0.878 \| good	4.809 \| good	0.008 \| good
2026-02-10T16:00:00.000Z	44 \| good	7.547 \| good	21.84 \| good	22.514 \| good	0.762 \| good	8.064 \| good	0.008 \| good
2026-02-10T17:00:00.000Z	33 \| good	6.053 \| good	12.707 \| good	25.287 \| good	0.727 \| good	6.351 \| good	0.009 \| good
2026-02-10T18:00:00.000Z	49 \| good	9.217 \| good	11.866 \| good	20.543 \| good	0.726 \| good	17.22 \| good	0.01 \| good
2026-02-10T19:00:00.000Z	52 \| moderate	9.957 \| good	35.432 \| good	19.941 \| good	0.743 \| good	8.894 \| good	0.013 \| good
2026-02-10T20:00:00.000Z	52 \| moderate	9.569 \| good	29.17 \| good	19.301 \| good	0.748 \| good	14.136 \| good	0.014 \| good
2026-02-10T21:00:00.000Z	56 \| moderate	12.028 \| good	22.423 \| good	15.545 \| good	0.765 \| good	10.328 \| good	0.015 \| good
2026-02-10T22:00:00.000Z	44 \| good	8.42 \| good	31.76 \| good	17.324 \| good	0.918 \| good	9.266 \| good	0.014 \| good
2026-02-10T23:00:00.000Z	38 \| good	6.919 \| good	29.813 \| good	16.682 \| good	0.912 \| good	6.373 \| good	0.013 \| good
2026-02-11T00:00:00.000Z	49 \| good	9.453 \| good	22.68 \| good	18.974 \| good	0.91 \| good	16.09 \| good	0.817 \| good
2026-02-11T01:00:00.000Z	44 \| good	8.197 \| good	32.67 \| good	15.173 \| good	0.95 \| good	20.277 \| good	0.781 \| good
2026-02-11T02:00:00.000Z	52 \| moderate	10.282 \| good	21.674 \| good	19.319 \| good	0.926 \| good	19.223 \| good	0.67 \| good
2026-02-11T03:00:00.000Z	54 \| moderate	10.6 \| good	23.976 \| good	19.429 \| good	0.904 \| good	14.415 \| good	0.514 \| good
2026-02-11T04:00:00.000Z	52 \| moderate	9.632 \| good	25.143 \| good	17.512 \| good	0.863 \| good	18.719 \| good	0.465 \| good
2026-02-11T05:00:00.000Z	49 \| good	8.946 \| good	27.517 \| good	21.407 \| good	0.859 \| good	14.961 \| good	0.378 \| good
2026-02-11T06:00:00.000Z	38 \| good	7.158 \| good	11.4 \| good	17.488 \| good	0.84 \| good	18.766 \| good	0.009 \| good
2026-02-11T07:00:00.000Z	44 \| good	7.893 \| good	16.788 \| good	18.015 \| good	0.859 \| good	7.765 \| good	0.01 \| good
2026-02-11T08:00:00.000Z	33 \| good	5.911 \| good	28.799 \| good	12.933 \| good	0.926 \| good	7.207 \| good	0.012 \| good
2026-02-11T09:00:00.000Z	22 \| good	4.462 \| good	15.88 \| good	15.282 \| good	1.01 \| good	9.451 \| good	0.011 \| good
2026-02-11T10:00:00.000Z	49 \| good	8.672 \| good	16.727 \| good	15.281 \| good	0.921 \| good	8.298 \| good	0.012 \| good
2026-02-11T11:00:00.000Z	24 \| good	4.268 \| good	7.153 \| good	26.084 \| good	0.949 \| good	8.547 \| good	0.012 \| good
2026-02-11T12:00:00.000Z	44 \| good	7.506 \| good	15.724 \| good	20.065 \| good	1.009 \| good	6.509 \| good	0.006 \| good
2026-02-11T13:00:00.000Z	38 \| good	6.725 \| good	14.32 \| good	24.497 \| good	0.925 \| good	5.798 \| good	0.006 \| good
2026-02-11T14:00:00.000Z	27 \| good	5.428 \| good	20.307 \| good	19.106 \| good	2.131 \| good	6.502 \| good	0.006 \| good
2026-02-11T15:00:00.000Z	38 \| good	6.811 \| good	23.862 \| good	22.643 \| good	1.152 \| good	5.229 \| good	0.007 \| good
2026-02-11T16:00:00.000Z	44 \| good	7.535 \| good	25.846 \| good	15.634 \| good	0.996 \| good	6.871 \| good	0.008 \| good
2026-02-11T17:00:00.000Z	33 \| good	6.465 \| good	35.078 \| good	24.198 \| good	0.983 \| good	6.652 \| good	0.009 \| good
2026-02-11T18:00:00.000Z	27 \| good	4.66 \| good	22.751 \| good	25.961 \| good	1.11 \| good	14.665 \| good	0.012 \| good
2026-02-11T19:00:00.000Z	33 \| good	5.98 \| good	23.351 \| good	26.411 \| good	0.945 \| good	15.823 \| good	0.015 \| good
2026-02-11T20:00:00.000Z	38 \| good	7.221 \| good	18.771 \| good	24.134 \| good	0.851 \| good	15.212 \| good	0.019 \| good
2026-02-11T21:00:00.000Z	38 \| good	6.73 \| good	14.778 \| good	28.951 \| good	0.864 \| good	17.147 \| good	0.016 \| good
2026-02-11T22:00:00.000Z	38 \| good	6.683 \| good	25.395 \| good	22.938 \| good	0.946 \| good	15.273 \| good	0.02 \| good
2026-02-11T23:00:00.000Z	52 \| moderate	10.304 \| good	22.856 \| good	20.544 \| good	0.949 \| good	23.968 \| good	0.019 \| good
2026-02-12T00:00:00.000Z	49 \| good	9.478 \| good	22.298 \| good	27.283 \| good	0.951 \| good	22.269 \| good	1.009 \| good
2026-02-12T01:00:00.000Z	38 \| good	7.442 \| good	15.657 \| good	19.224 \| good	0.864 \| good	14.342 \| good	0.803 \| good
2026-02-12T01:00:00.000Z	44 \| good	7.552 \| good	19.766 \| good	21.37 \| good	0.862 \| good	14.251 \| good	0.803 \| good
2026-02-12T00:00:00.000Z	52 \| moderate	10.157 \| good	12.214 \| good	18.409 \| good	0.525 \| good	15.976 \| good	0.167 \| good
2026-02-12T01:00:00.000Z	52 \| moderate	10.299 \| good	12.661 \| good	19.539 \| good	0.434 \| good	13.353 \| good	0.167 \| good
2026-02-12T02:00:00.000Z	52 \| moderate	10.386 \| good	13.665 \| good	18.925 \| good	0.363 \| good	10.688 \| good	0.158 \| good
2026-02-12T03:00:00.000Z	54 \| moderate	11.31 \| good	13.907 \| good	19.496 \| good	0.348 \| good	7.817 \| good	0.15 \| good
2026-02-12T04:00:00.000Z	52 \| moderate	10.237 \| good	13.574 \| good	19.968 \| good	0.282 \| good	5.989 \| good	0.143 \| good
2026-02-12T05:00:00.000Z	52 \| moderate	9.533 \| good	12.028 \| good	20.774 \| good	0.261 \| good	4.904 \| good	0.143 \| good
2026-02-12T06:00:00.000Z	52 \| moderate	9.546 \| good	11.62 \| good	23.194 \| good	0.293 \| good	4.703 \| good	0.141 \| good
2026-02-12T07:00:00.000Z	52 \| moderate	9.714 \| good	13.051 \| good	22.935 \| good	0.386 \| good	6.977 \| good	0.148 \| good
2026-02-12T08:00:00.000Z	52 \| moderate	10.359 \| good	15.934 \| good	19.99 \| good	0.44 \| good	9.63 \| good	0.153 \| good
2026-02-12T09:00:00.000Z	52 \| moderate	9.699 \| good	13.308 \| good	21.574 \| good	0.421 \| good	10.302 \| good	0.153 \| good
2026-02-12T10:00:00.000Z	49 \| good	9.074 \| good	14.001 \| good	23.054 \| good	0.396 \| good	9.104 \| good	0.148 \| good
2026-02-12T11:00:00.000Z	49 \| good	8.736 \| good	12.996 \| good	25.598 \| good	0.397 \| good	7.912 \| good	0.146 \| good
2026-02-12T12:00:00.000Z	49 \| good	8.67 \| good	11.515 \| good	22.607 \| good	0.403 \| good	7.377 \| good	0.157 \| good
2026-02-12T13:00:00.000Z	44 \| good	8.036 \| good	9.03 \| good	17.609 \| good	0.384 \| good	7.612 \| good	0.176 \| good
2026-02-12T14:00:00.000Z	38 \| good	7.19 \| good	7.63 \| good	13.847 \| good	0.352 \| good	7.755 \| good	0.211 \| good
2026-02-12T15:00:00.000Z	33 \| good	5.53 \| good	6.824 \| good	11.757 \| good	0.333 \| good	7.761 \| good	0.225 \| good
2026-02-12T16:00:00.000Z	27 \| good	5.133 \| good	6.496 \| good	12.318 \| good	0.319 \| good	7.326 \| good	0.225 \| good
2026-02-12T17:00:00.000Z	27 \| good	5.364 \| good	6.881 \| good	13.296 \| good	0.378 \| good	7.855 \| good	0.235 \| good
2026-02-12T18:00:00.000Z	33 \| good	6.333 \| good	8.329 \| good	13.405 \| good	0.494 \| good	8.556 \| good	0.239 \| good
2026-02-12T19:00:00.000Z	38 \| good	6.821 \| good	8.615 \| good	12.329 \| good	0.492 \| good	8.63 \| good	0.242 \| good
2026-02-12T20:00:00.000Z	38 \| good	7.225 \| good	8.991 \| good	12.434 \| good	0.406 \| good	7.709 \| good	0.237 \| good
2026-02-12T21:00:00.000Z	38 \| good	6.665 \| good	8.816 \| good	12.938 \| good	0.404 \| good	6.839 \| good	0.237 \| good
2026-02-12T22:00:00.000Z	38 \| good	6.683 \| good	8.488 \| good	14.217 \| good	0.438 \| good	6.091 \| good	0.232 \| good
2026-02-12T23:00:00.000Z	38 \| good	7.027 \| good	8.972 \| good	15.434 \| good	0.385 \| good	5.344 \| good	0.218 \| good
2026-02-13T00:00:00.000Z	38 \| good	7.277 \| good	8.957 \| good	16.532 \| good	0.296 \| good	4.618 \| good	0.209 \| good
2026-02-13T01:00:00.000Z	38 \| good	6.672 \| good	8.048 \| good	18.218 \| good	0.194 \| good	3.811 \| good	0.2 \| good
2026-02-13T02:00:00.000Z	33 \| good	5.644 \| good	6.664 \| good	18.785 \| good	0.142 \| good	3.001 \| good	0.19 \| good
2026-02-13T03:00:00.000Z	27 \| good	5.061 \| good	5.835 \| good	19.374 \| good	0.128 \| good	2.614 \| good	0.179 \| good
2026-02-13T04:00:00.000Z	22 \| good	4.218 \| good	5.421 \| good	21.66 \| good	0.107 \| good	2.247 \| good	0.168 \| good
2026-02-13T05:00:00.000Z	22 \| good	3.558 \| good	5.199 \| good	22.64 \| good	0.114 \| good	1.741 \| good	0.157 \| good
2026-02-13T06:00:00.000Z	21 \| good	3.181 \| good	4.82 \| good	23.363 \| good	0.167 \| good	1.914 \| good	0.155 \| good
2026-02-13T07:00:00.000Z	24 \| good	3.104 \| good	4.484 \| good	25.928 \| good	0.191 \| good	2.411 \| good	0.154 \| good
2026-02-13T08:00:00.000Z	26 \| good	3.114 \| good	4.696 \| good	27.716 \| good	0.245 \| good	3.108 \| good	0.155 \| good
2026-02-13T09:00:00.000Z	28 \| good	3.218 \| good	4.765 \| good	29.835 \| good	0.257 \| good	3.339 \| good	0.157 \| good
2026-02-13T10:00:00.000Z	30 \| good	3.336 \| good	4.92 \| good	31.63 \| good	0.231 \| good	3.081 \| good	0.155 \| good
2026-02-13T11:00:00.000Z	31 \| good	3.354 \| good	4.883 \| good	32.851 \| good	0.203 \| good	2.646 \| good	0.151 \| good
2026-02-13T12:00:00.000Z	31 \| good	3.221 \| good	4.853 \| good	34.449 \| good	0.181 \| good	2.227 \| good	0.147 \| good
2026-02-13T13:00:00.000Z	33 \| good	3.308 \| good	5.713 \| good	36.018 \| good	0.171 \| good	1.933 \| good	0.143 \| good
2026-02-13T14:00:00.000Z	34 \| good	2.928 \| good	5.758 \| good	37.32 \| good	0.161 \| good	1.804 \| good	0.14 \| good
2026-02-13T15:00:00.000Z	35 \| good	2.96 \| good	5.712 \| good	38.407 \| good	0.163 \| good	2.104 \| good	0.139 \| good
2026-02-13T16:00:00.000Z	35 \| good	2.856 \| good	6.075 \| good	37.983 \| good	0.166 \| good	2.54 \| good	0.141 \| good
2026-02-13T17:00:00.000Z	35 \| good	3.057 \| good	6.782 \| good	38.169 \| good	0.223 \| good	3.255 \| good	0.143 \| good
2026-02-13T18:00:00.000Z	33 \| good	3.286 \| good	7.353 \| good	35.722 \| good	0.268 \| good	3.497 \| good	0.147 \| good
2026-02-13T19:00:00.000Z	31 \| good	3.532 \| good	7.391 \| good	34.092 \| good	0.299 \| good	3.623 \| good	0.148 \| good
2026-02-13T20:00:00.000Z	32 \| good	3.752 \| good	7.366 \| good	35.051 \| good	0.319 \| good	3.483 \| good	0.145 \| good
2026-02-13T21:00:00.000Z	31 \| good	3.375 \| good	6.004 \| good	34.238 \| good	0.399 \| good	3.128 \| good	0.144 \| good
2026-02-13T22:00:00.000Z	32 \| good	3.364 \| good	6.073 \| good	35.175 \| good	0.503 \| good	3.258 \| good	0.143 \| good
2026-02-13T23:00:00.000Z	32 \| good	3.516 \| good	5.51 \| good	34.84 \| good	0.433 \| good	3.336 \| good	0.143 \| 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?