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

The current PM10 concentration at Hertfordshire, UK is 12.49 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.427 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 29.977 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 4.836 ppb.

Hertfordshire, UK live air quality index now

Q: What is the current concentration of PM2.5 in Hertfordshire, UK?

The current PM2.5 concentration at Hertfordshire, UK is 3.566 μg/m3.

Stay updated with real-time air quality in Hertfordshire, UK featuring accurate data on AQI, PM_2.5, PM₁₀, O₃, NO₂, SO₂, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.

Live AQI (Air Quality Index)

Good

Hertfordshire, UK

Last updated: ... (Local time)

Major air pollutants in Hertfordshire, UK

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

4.44 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

11.17 μg/m³

155

255

425

605+

Ozone (O₃)

32.98 ppb

201

201+

Sulfur Dioxide (SO₂)

0.43 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

6.62 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.17 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
2026-06-27T19:00:00.000Z	38 \| good	7.002 \| good	12.571 \| good	34.849 \| good	0.616 \| good	6.797 \| good	0.187 \| good
2026-06-27T20:00:00.000Z	39 \| good	5.821 \| good	12.98 \| good	42.02 \| good	0.62 \| good	6.659 \| good	0.2 \| good
2026-06-27T21:00:00.000Z	38 \| good	6.756 \| good	15.972 \| good	37.489 \| good	0.619 \| good	6.641 \| good	0.217 \| good
2026-06-27T22:00:00.000Z	40 \| good	6.386 \| good	12.619 \| good	42.699 \| good	0.524 \| good	5.765 \| good	0.181 \| good
2026-06-27T23:00:00.000Z	34 \| good	6.234 \| good	17.304 \| good	36.593 \| good	0.528 \| good	6.773 \| good	0.17 \| good
2026-06-28T00:00:00.000Z	42 \| good	6.906 \| good	14.979 \| good	44.951 \| good	0.704 \| good	4.81 \| good	0.151 \| good
2026-06-28T01:00:00.000Z	42 \| good	6.561 \| good	23.936 \| good	45.22 \| good	0.564 \| good	5.249 \| good	0.144 \| good
2026-06-28T02:00:00.000Z	38 \| good	6.781 \| good	15.22 \| good	36.333 \| good	0.765 \| good	5.995 \| good	0.13 \| good
2026-06-28T03:00:00.000Z	38 \| good	6.796 \| good	11.737 \| good	36.877 \| good	0.859 \| good	5.496 \| good	0.127 \| good
2026-06-28T04:00:00.000Z	33 \| good	6.499 \| good	16.778 \| good	34.47 \| good	0.859 \| good	3.67 \| good	0.123 \| good
2026-06-28T05:00:00.000Z	38 \| good	6.972 \| good	12.811 \| good	32.472 \| good	0.601 \| good	3.784 \| good	0.13 \| good
2026-06-28T06:00:00.000Z	29 \| good	4.306 \| good	13.045 \| good	31.043 \| good	0.454 \| good	2.394 \| good	0.144 \| good
2026-06-28T07:00:00.000Z	38 \| good	6.897 \| good	14.314 \| good	29.051 \| good	0.604 \| good	2.43 \| good	0.146 \| good
2026-06-28T08:00:00.000Z	27 \| good	4.666 \| good	13.12 \| good	29.189 \| good	0.502 \| good	2.02 \| good	0.151 \| good
2026-06-28T09:00:00.000Z	38 \| good	6.934 \| good	12.551 \| good	22.979 \| good	0.501 \| good	3.192 \| good	0.139 \| good
2026-06-28T10:00:00.000Z	33 \| good	6.325 \| good	12.2 \| good	21.099 \| good	0.501 \| good	4.351 \| good	0.132 \| good
2026-06-28T11:00:00.000Z	33 \| good	6.02 \| good	12.94 \| good	23.511 \| good	0.412 \| good	3.375 \| good	0.13 \| good
2026-06-28T12:00:00.000Z	27 \| good	4.827 \| good	14.03 \| good	24.512 \| good	0.412 \| good	3.335 \| good	0.129 \| good
2026-06-28T13:00:00.000Z	22 \| good	4.263 \| good	13.93 \| good	23.914 \| good	0.559 \| good	4.811 \| good	0.13 \| good
2026-06-28T14:00:00.000Z	38 \| good	7.18 \| good	11.948 \| good	24.731 \| good	0.412 \| good	4.93 \| good	0.008 \| good
2026-06-28T15:00:00.000Z	22 \| good	4.19 \| good	9.06 \| good	22.815 \| good	0.411 \| good	4.987 \| good	0.008 \| good
2026-06-28T16:00:00.000Z	27 \| good	4.585 \| good	11.229 \| good	28.722 \| good	0.412 \| good	6.638 \| good	0.008 \| good
2026-06-28T17:00:00.000Z	29 \| good	4.901 \| good	14.227 \| good	30.732 \| good	0.459 \| good	3.61 \| good	0.008 \| good
2026-06-28T18:00:00.000Z	26 \| good	4.5 \| good	14.874 \| good	27.729 \| good	0.46 \| good	6.485 \| good	0.009 \| good
2026-06-28T19:00:00.000Z	27 \| good	5.087 \| good	12.65 \| good	26.152 \| good	0.46 \| good	5.243 \| good	0.01 \| good
2026-06-28T20:00:00.000Z	31 \| good	4.188 \| good	13.538 \| good	33.257 \| good	0.512 \| good	5.409 \| good	0.01 \| good
2026-06-28T21:00:00.000Z	31 \| good	4.852 \| good	7.445 \| good	33.309 \| good	0.512 \| good	4.819 \| good	0.011 \| good
2026-06-28T22:00:00.000Z	31 \| good	3.914 \| good	15.424 \| good	34.429 \| good	0.412 \| good	4.379 \| good	0.01 \| good
2026-06-28T23:00:00.000Z	31 \| good	4.016 \| good	9.684 \| good	34.494 \| good	0.459 \| good	4.582 \| good	0.01 \| good
2026-06-29T00:00:00.000Z	31 \| good	3.287 \| good	12.941 \| good	33.822 \| good	0.562 \| good	3.91 \| good	0.153 \| good
2026-06-29T01:00:00.000Z	32 \| good	4.277 \| good	9.864 \| good	34.778 \| good	0.44 \| good	3.811 \| good	0.148 \| good
2026-06-29T02:00:00.000Z	30 \| good	3.059 \| good	9.174 \| good	32.121 \| good	0.441 \| good	4.565 \| good	0.134 \| good
2026-06-29T03:00:00.000Z	30 \| good	3.719 \| good	8.548 \| good	31.73 \| good	0.661 \| good	4.142 \| good	0.132 \| good
2026-06-29T04:00:00.000Z	29 \| good	3.569 \| good	9.473 \| good	31.444 \| good	0.621 \| good	5.268 \| good	0.132 \| good
2026-06-29T05:00:00.000Z	28 \| good	3.32 \| good	9.919 \| good	30.417 \| good	0.525 \| good	4.023 \| good	0.136 \| good
2026-06-29T06:00:00.000Z	26 \| good	4.301 \| good	9.938 \| good	28.036 \| good	0.423 \| good	7.783 \| good	0.153 \| good
2026-06-29T07:00:00.000Z	30 \| good	4.267 \| good	10.633 \| good	31.898 \| good	0.42 \| good	9.552 \| good	0.172 \| good
2026-06-29T08:00:00.000Z	25 \| good	4.099 \| good	10.962 \| good	26.795 \| good	0.503 \| good	8.164 \| good	0.167 \| good
2026-06-29T09:00:00.000Z	27 \| good	4.239 \| good	12.612 \| good	29.22 \| good	0.426 \| good	8.043 \| good	0.153 \| good
2026-06-29T10:00:00.000Z	27 \| good	3.657 \| good	10.993 \| good	28.575 \| good	0.427 \| good	7.379 \| good	0.132 \| good
2026-06-29T11:00:00.000Z	27 \| good	3.742 \| good	12.133 \| good	28.664 \| good	0.427 \| good	8.107 \| good	0.124 \| good
2026-06-29T12:00:00.000Z	26 \| good	3.382 \| good	11.966 \| good	28.286 \| good	0.425 \| good	7.621 \| good	0.124 \| good
2026-06-29T13:00:00.000Z	28 \| good	3.34 \| good	12.438 \| good	29.601 \| good	0.425 \| good	5.42 \| good	0.122 \| good
2026-06-29T14:00:00.000Z	26 \| good	3.622 \| good	11.741 \| good	28.345 \| good	0.585 \| good	6.365 \| good	0.136 \| good
2026-06-29T15:00:00.000Z	28 \| good	4.728 \| good	10.275 \| good	29.533 \| good	0.587 \| good	6.321 \| good	0.139 \| good
2026-06-29T16:00:00.000Z	33 \| good	5.939 \| good	10.473 \| good	31.276 \| good	0.586 \| good	6.922 \| good	0.124 \| good
2026-06-29T17:00:00.000Z	29 \| good	4.871 \| good	10.166 \| good	30.548 \| good	0.425 \| good	9.76 \| good	0.173 \| good
2026-06-29T18:00:00.000Z	31 \| good	4.444 \| good	11.173 \| good	32.976 \| good	0.427 \| good	6.616 \| good	0.173 \| good
2026-06-29T15:00:00.000Z	39 \| good	5.772 \| good	9.575 \| good	42.228 \| good	0.118 \| good	1.317 \| good	0.092 \| good
2026-06-29T16:00:00.000Z	39 \| good	5.748 \| good	9.299 \| good	42.425 \| good	0.124 \| good	1.485 \| good	0.092 \| good
2026-06-29T17:00:00.000Z	39 \| good	5.46 \| good	9.26 \| good	42.088 \| good	0.127 \| good	1.758 \| good	0.092 \| good
2026-06-29T18:00:00.000Z	38 \| good	5.339 \| good	9.38 \| good	41.325 \| good	0.133 \| good	1.952 \| good	0.093 \| good
2026-06-29T19:00:00.000Z	36 \| good	5.217 \| good	9.298 \| good	39.444 \| good	0.143 \| good	2.294 \| good	0.094 \| good
2026-06-29T20:00:00.000Z	34 \| good	5.129 \| good	9.491 \| good	37.472 \| good	0.154 \| good	3.352 \| good	0.096 \| good
2026-06-29T21:00:00.000Z	31 \| good	5.027 \| good	9.985 \| good	33.557 \| good	0.211 \| good	4.955 \| good	0.097 \| good
2026-06-29T22:00:00.000Z	28 \| good	5.164 \| good	10.272 \| good	29.775 \| good	0.252 \| good	5.687 \| good	0.099 \| good
2026-06-29T23:00:00.000Z	27 \| good	5.416 \| good	10.374 \| good	27.618 \| good	0.218 \| good	4.614 \| good	0.098 \| good
2026-06-30T00:00:00.000Z	33 \| good	5.837 \| good	10.708 \| good	25.909 \| good	0.189 \| good	4.13 \| good	0.096 \| good
2026-06-30T01:00:00.000Z	33 \| good	6.136 \| good	11.255 \| good	23.985 \| good	0.182 \| good	4.275 \| good	0.095 \| good
2026-06-30T02:00:00.000Z	33 \| good	6.386 \| good	11.826 \| good	22.56 \| good	0.188 \| good	4.077 \| good	0.094 \| good
2026-06-30T03:00:00.000Z	38 \| good	6.504 \| good	11.942 \| good	21.821 \| good	0.194 \| good	3.877 \| good	0.094 \| good
2026-06-30T04:00:00.000Z	38 \| good	6.501 \| good	11.725 \| good	21.686 \| good	0.196 \| good	3.936 \| good	0.094 \| good
2026-06-30T05:00:00.000Z	38 \| good	6.536 \| good	11.603 \| good	22.219 \| good	0.21 \| good	4.197 \| good	0.093 \| good
2026-06-30T06:00:00.000Z	38 \| good	6.903 \| good	11.49 \| good	21.993 \| good	0.238 \| good	4.274 \| good	0.091 \| good
2026-06-30T07:00:00.000Z	38 \| good	6.867 \| good	11.302 \| good	23.463 \| good	0.248 \| good	4.494 \| good	0.095 \| good
2026-06-30T08:00:00.000Z	38 \| good	6.54 \| good	10.603 \| good	26.676 \| good	0.238 \| good	4.191 \| good	0.095 \| good
2026-06-30T09:00:00.000Z	33 \| good	5.948 \| good	9.91 \| good	29.1 \| good	0.209 \| good	3.465 \| good	0.093 \| good
2026-06-30T10:00:00.000Z	33 \| good	5.545 \| good	9.318 \| good	31.978 \| good	0.182 \| good	2.673 \| good	0.093 \| good
2026-06-30T11:00:00.000Z	33 \| good	5.368 \| good	8.509 \| good	36.489 \| good	0.151 \| good	1.967 \| good	0.091 \| good
2026-06-30T12:00:00.000Z	37 \| good	4.843 \| good	8.324 \| good	40.131 \| good	0.117 \| good	1.508 \| good	0.089 \| good
2026-06-30T13:00:00.000Z	39 \| good	4.509 \| good	7.687 \| good	42.156 \| good	0.107 \| good	1.443 \| good	0.088 \| good
2026-06-30T14:00:00.000Z	39 \| good	4.754 \| good	7.056 \| good	41.725 \| good	0.103 \| good	1.334 \| good	0.087 \| good
2026-06-30T15:00:00.000Z	38 \| good	4.307 \| good	7.069 \| good	41.101 \| good	0.107 \| good	1.439 \| good	0.085 \| good
2026-06-30T16:00:00.000Z	37 \| good	4.275 \| good	6.552 \| good	40.489 \| good	0.105 \| good	1.72 \| good	0.085 \| good
2026-06-30T17:00:00.000Z	35 \| good	4.137 \| good	6.661 \| good	37.956 \| good	0.109 \| good	2.23 \| good	0.085 \| good
2026-06-30T18:00:00.000Z	31 \| good	3.824 \| good	7.266 \| good	33.378 \| good	0.116 \| good	2.643 \| good	0.086 \| good
2026-06-30T19:00:00.000Z	29 \| good	3.936 \| good	7.014 \| good	31.241 \| good	0.113 \| good	2.501 \| good	0.087 \| good
2026-06-30T20:00:00.000Z	28 \| good	4.317 \| good	7.198 \| good	29.98 \| good	0.114 \| good	2.602 \| good	0.086 \| good
2026-06-30T21:00:00.000Z	26 \| good	4.272 \| good	7.724 \| good	28.258 \| good	0.145 \| good	3.115 \| good	0.088 \| good
2026-06-30T22:00:00.000Z	24 \| good	4.117 \| good	8.004 \| good	25.543 \| good	0.174 \| good	3.583 \| good	0.091 \| good
2026-06-30T23:00:00.000Z	22 \| good	4.096 \| good	7.836 \| good	23.996 \| good	0.183 \| good	3.692 \| good	0.094 \| good
2026-07-01T00:00:00.000Z	22 \| good	4.232 \| good	7.819 \| good	22.218 \| good	0.187 \| good	3.816 \| good	0.096 \| good
2026-07-01T01:00:00.000Z	22 \| good	4.349 \| good	7.665 \| good	20.176 \| good	0.199 \| good	3.676 \| good	0.097 \| good
2026-07-01T02:00:00.000Z	22 \| good	4.279 \| good	7.288 \| good	18.612 \| good	0.187 \| good	3.35 \| good	0.095 \| good
2026-07-01T03:00:00.000Z	22 \| good	4.07 \| good	6.718 \| good	17.43 \| good	0.147 \| good	3.127 \| good	0.093 \| good
2026-07-01T04:00:00.000Z	22 \| good	3.83 \| good	6.214 \| good	17.54 \| good	0.128 \| good	3.068 \| good	0.09 \| good
2026-07-01T05:00:00.000Z	22 \| good	3.746 \| good	5.883 \| good	17.991 \| good	0.116 \| good	2.781 \| good	0.087 \| good
2026-07-01T06:00:00.000Z	22 \| good	3.9 \| good	5.915 \| good	18.727 \| good	0.128 \| good	2.626 \| good	0.089 \| good
2026-07-01T07:00:00.000Z	22 \| good	3.818 \| good	5.942 \| good	21.533 \| good	0.159 \| good	2.877 \| good	0.091 \| good
2026-07-01T08:00:00.000Z	23 \| good	3.521 \| good	5.791 \| good	25.466 \| good	0.155 \| good	2.875 \| good	0.091 \| good
2026-07-01T09:00:00.000Z	26 \| good	3.579 \| good	5.879 \| good	28.36 \| good	0.14 \| good	2.58 \| good	0.091 \| good
2026-07-01T10:00:00.000Z	29 \| good	3.335 \| good	5.65 \| good	31.128 \| good	0.123 \| good	2.034 \| good	0.09 \| good
2026-07-01T11:00:00.000Z	31 \| good	3.063 \| good	4.94 \| good	33.117 \| good	0.116 \| good	1.676 \| good	0.09 \| good
2026-07-01T12:00:00.000Z	31 \| good	3.202 \| good	4.762 \| good	34.243 \| good	0.113 \| good	1.54 \| good	0.091 \| good
2026-07-01T13:00:00.000Z	34 \| good	2.939 \| good	4.384 \| good	36.624 \| good	0.103 \| good	1.356 \| good	0.09 \| good
2026-07-01T14:00:00.000Z	37 \| good	2.797 \| good	4.135 \| good	39.861 \| good	0.093 \| good	1.275 \| good	0.089 \| good

Hertfordshire

Get reliable air quality data to drive your business

Hertfordshire, UK air quality map: Track AQI near you

Air quality in cities of Hertfordshire, UK

City	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
Abbots Langley, Hertfordshire	26 Good	3.84μg/m³ Good	14.05μg/m³ Good	27.90ppb Good	0.42ppb Good	6.14ppb Good	0.12ppm Good
Berkhamsted, Hertfordshire	26 Good	3.88μg/m³ Good	14.02μg/m³ Good	27.85ppb Good	0.42ppb Good	4.79ppb Good	0.12ppm Good
Bushey, Hertfordshire	29 Good	4.23μg/m³ Good	13.20μg/m³ Good	31.13ppb Good	0.37ppb Good	3.71ppb Good	0.12ppm Good
Chorleywood, Hertfordshire	28 Good	4.01μg/m³ Good	12.71μg/m³ Good	29.92ppb Good	0.42ppb Good	5.45ppb Good	0.12ppm Good
Rickmansworth, Hertfordshire	28 Good	4.01μg/m³ Good	12.71μg/m³ Good	29.92ppb Good	0.42ppb Good	5.45ppb Good	0.12ppm Good
Hertford, Hertfordshire	28 Good	3.44μg/m³ Good	10.34μg/m³ Good	30.40ppb Good	0.43ppb Good	4.52ppb Good	0.12ppm Good
Baldock, Hertfordshire	28 Good	3.72μg/m³ Good	13.02μg/m³ Good	29.55ppb Good	0.44ppb Good	5.12ppb Good	0.12ppm Good
Bishop's Stortford, Hertfordshire	28 Good	2.73μg/m³ Good	15.06μg/m³ Good	30.01ppb Good	0.41ppb Good	4.45ppb Good	0.12ppm Good
Cheshunt, Hertfordshire	30 Good	3.30μg/m³ Good	10.05μg/m³ Good	32.22ppb Good	0.45ppb Good	3.07ppb Good	0.12ppm Good
Borehamwood, Hertfordshire	29 Good	3.40μg/m³ Good	8.33μg/m³ Good	30.81ppb Good	0.41ppb Good	4.67ppb Good	0.12ppm Good
Hemel Hempstead, Hertfordshire	26 Good	3.84μg/m³ Good	14.05μg/m³ Good	27.90ppb Good	0.42ppb Good	6.14ppb Good	0.12ppm Good
Harpenden, Hertfordshire	26 Good	3.78μg/m³ Good	14.12μg/m³ Good	27.89ppb Good	0.42ppb Good	6.93ppb Good	0.12ppm Good
Hatfield, Hertfordshire	28 Good	3.68μg/m³ Good	12.19μg/m³ Good	29.83ppb Good	0.42ppb Good	5.76ppb Good	0.12ppm Good
Potters Bar, Hertfordshire	28 Good	3.75μg/m³ Good	11.59μg/m³ Good	29.79ppb Good	0.48ppb Good	4.54ppb Good	0.12ppm Good
St Albans, Hertfordshire	28 Good	4.05μg/m³ Good	12.80μg/m³ Good	30.44ppb Good	0.39ppb Good	4.90ppb Good	0.12ppm Good
Letchworth, Hertfordshire	28 Good	3.37μg/m³ Good	12.98μg/m³ Good	29.67ppb Good	0.44ppb Good	5.33ppb Good	0.12ppm Good
Sawbridgeworth, Hertfordshire	28 Good	2.73μg/m³ Good	15.06μg/m³ Good	30.01ppb Good	0.41ppb Good	4.45ppb Good	0.12ppm Good
Stevenage, Hertfordshire	28 Good	3.37μg/m³ Good	12.98μg/m³ Good	29.67ppb Good	0.44ppb Good	5.33ppb Good	0.12ppm Good
Hitchin, Hertfordshire	28 Good	3.37μg/m³ Good	12.98μg/m³ Good	29.67ppb Good	0.44ppb Good	5.33ppb Good	0.12ppm Good
Hoddesdon, Hertfordshire	30 Good	3.40μg/m³ Good	9.87μg/m³ Good	31.98ppb Good	0.45ppb Good	3.94ppb Good	0.12ppm Good
Royston, Hertfordshire	29 Good	3.23μg/m³ Good	12.20μg/m³ Good	31.17ppb Good	0.44ppb Good	4.92ppb Good	0.12ppm Good
Waltham Cross, Hertfordshire	30 Good	3.20μg/m³ Good	10.22μg/m³ Good	32.46ppb Good	0.45ppb Good	2.06ppb Good	0.12ppm Good
Tring, Hertfordshire	25 Good	3.88μg/m³ Good	14.05μg/m³ Good	26.77ppb Good	0.42ppb Good	3.67ppb Good	0.12ppm Good
Ware, Hertfordshire	29 Good	3.08μg/m³ Good	12.77μg/m³ Good	31.28ppb Good	0.42ppb Good	4.62ppb Good	0.12ppm Good
Watford, Hertfordshire	30 Good	4.06μg/m³ Good	10.96μg/m³ Good	31.57ppb Good	0.41ppb Good	5.02ppb Good	0.12ppm Good
Welwyn Garden City, Hertfordshire	28 Good	3.34μg/m³ Good	12.44μg/m³ Good	29.60ppb Good	0.42ppb Good	5.42ppb Good	0.12ppm Good

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

0.12ppm

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

Check live rankings of places in the UK affected by air pollution.

View Polluted Cities

Check live rankings of places in the UK with the cleanest air.

View Clean Cities

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 02:00:00 on 2026-06-28.

When was the best air quality at Hertfordshire, UK in the last 24 hrs?

In the last 24 hrs, the best air quality in Hertfordshire, UK was observed at 03:00:00 on 2026-06-28.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 28, categorized as Good based on real-time data.

What pollutant is the most common in Hertfordshire, UK?

The most common pollutant in Hertfordshire, UK is O3.

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

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

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

The current PM_2.5 concentration at Hertfordshire, UK is 3.566 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 12.49 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.122 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.427 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 29.977 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 4.836 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-06-27T19:00:00.000Z	38 \| good	7.002 \| good	12.571 \| good	34.849 \| good	0.616 \| good	6.797 \| good	0.187 \| good
2026-06-27T20:00:00.000Z	39 \| good	5.821 \| good	12.98 \| good	42.02 \| good	0.62 \| good	6.659 \| good	0.2 \| good
2026-06-27T21:00:00.000Z	38 \| good	6.756 \| good	15.972 \| good	37.489 \| good	0.619 \| good	6.641 \| good	0.217 \| good
2026-06-27T22:00:00.000Z	40 \| good	6.386 \| good	12.619 \| good	42.699 \| good	0.524 \| good	5.765 \| good	0.181 \| good
2026-06-27T23:00:00.000Z	34 \| good	6.234 \| good	17.304 \| good	36.593 \| good	0.528 \| good	6.773 \| good	0.17 \| good
2026-06-28T00:00:00.000Z	42 \| good	6.906 \| good	14.979 \| good	44.951 \| good	0.704 \| good	4.81 \| good	0.151 \| good
2026-06-28T01:00:00.000Z	42 \| good	6.561 \| good	23.936 \| good	45.22 \| good	0.564 \| good	5.249 \| good	0.144 \| good
2026-06-28T02:00:00.000Z	38 \| good	6.781 \| good	15.22 \| good	36.333 \| good	0.765 \| good	5.995 \| good	0.13 \| good
2026-06-28T03:00:00.000Z	38 \| good	6.796 \| good	11.737 \| good	36.877 \| good	0.859 \| good	5.496 \| good	0.127 \| good
2026-06-28T04:00:00.000Z	33 \| good	6.499 \| good	16.778 \| good	34.47 \| good	0.859 \| good	3.67 \| good	0.123 \| good
2026-06-28T05:00:00.000Z	38 \| good	6.972 \| good	12.811 \| good	32.472 \| good	0.601 \| good	3.784 \| good	0.13 \| good
2026-06-28T06:00:00.000Z	29 \| good	4.306 \| good	13.045 \| good	31.043 \| good	0.454 \| good	2.394 \| good	0.144 \| good
2026-06-28T07:00:00.000Z	38 \| good	6.897 \| good	14.314 \| good	29.051 \| good	0.604 \| good	2.43 \| good	0.146 \| good
2026-06-28T08:00:00.000Z	27 \| good	4.666 \| good	13.12 \| good	29.189 \| good	0.502 \| good	2.02 \| good	0.151 \| good
2026-06-28T09:00:00.000Z	38 \| good	6.934 \| good	12.551 \| good	22.979 \| good	0.501 \| good	3.192 \| good	0.139 \| good
2026-06-28T10:00:00.000Z	33 \| good	6.325 \| good	12.2 \| good	21.099 \| good	0.501 \| good	4.351 \| good	0.132 \| good
2026-06-28T11:00:00.000Z	33 \| good	6.02 \| good	12.94 \| good	23.511 \| good	0.412 \| good	3.375 \| good	0.13 \| good
2026-06-28T12:00:00.000Z	27 \| good	4.827 \| good	14.03 \| good	24.512 \| good	0.412 \| good	3.335 \| good	0.129 \| good
2026-06-28T13:00:00.000Z	22 \| good	4.263 \| good	13.93 \| good	23.914 \| good	0.559 \| good	4.811 \| good	0.13 \| good
2026-06-28T14:00:00.000Z	38 \| good	7.18 \| good	11.948 \| good	24.731 \| good	0.412 \| good	4.93 \| good	0.008 \| good
2026-06-28T15:00:00.000Z	22 \| good	4.19 \| good	9.06 \| good	22.815 \| good	0.411 \| good	4.987 \| good	0.008 \| good
2026-06-28T16:00:00.000Z	27 \| good	4.585 \| good	11.229 \| good	28.722 \| good	0.412 \| good	6.638 \| good	0.008 \| good
2026-06-28T17:00:00.000Z	29 \| good	4.901 \| good	14.227 \| good	30.732 \| good	0.459 \| good	3.61 \| good	0.008 \| good
2026-06-28T18:00:00.000Z	26 \| good	4.5 \| good	14.874 \| good	27.729 \| good	0.46 \| good	6.485 \| good	0.009 \| good
2026-06-28T19:00:00.000Z	27 \| good	5.087 \| good	12.65 \| good	26.152 \| good	0.46 \| good	5.243 \| good	0.01 \| good
2026-06-28T20:00:00.000Z	31 \| good	4.188 \| good	13.538 \| good	33.257 \| good	0.512 \| good	5.409 \| good	0.01 \| good
2026-06-28T21:00:00.000Z	31 \| good	4.852 \| good	7.445 \| good	33.309 \| good	0.512 \| good	4.819 \| good	0.011 \| good
2026-06-28T22:00:00.000Z	31 \| good	3.914 \| good	15.424 \| good	34.429 \| good	0.412 \| good	4.379 \| good	0.01 \| good
2026-06-28T23:00:00.000Z	31 \| good	4.016 \| good	9.684 \| good	34.494 \| good	0.459 \| good	4.582 \| good	0.01 \| good
2026-06-29T00:00:00.000Z	31 \| good	3.287 \| good	12.941 \| good	33.822 \| good	0.562 \| good	3.91 \| good	0.153 \| good
2026-06-29T01:00:00.000Z	32 \| good	4.277 \| good	9.864 \| good	34.778 \| good	0.44 \| good	3.811 \| good	0.148 \| good
2026-06-29T02:00:00.000Z	30 \| good	3.059 \| good	9.174 \| good	32.121 \| good	0.441 \| good	4.565 \| good	0.134 \| good
2026-06-29T03:00:00.000Z	30 \| good	3.719 \| good	8.548 \| good	31.73 \| good	0.661 \| good	4.142 \| good	0.132 \| good
2026-06-29T04:00:00.000Z	29 \| good	3.569 \| good	9.473 \| good	31.444 \| good	0.621 \| good	5.268 \| good	0.132 \| good
2026-06-29T05:00:00.000Z	28 \| good	3.32 \| good	9.919 \| good	30.417 \| good	0.525 \| good	4.023 \| good	0.136 \| good
2026-06-29T06:00:00.000Z	26 \| good	4.301 \| good	9.938 \| good	28.036 \| good	0.423 \| good	7.783 \| good	0.153 \| good
2026-06-29T07:00:00.000Z	30 \| good	4.267 \| good	10.633 \| good	31.898 \| good	0.42 \| good	9.552 \| good	0.172 \| good
2026-06-29T08:00:00.000Z	25 \| good	4.099 \| good	10.962 \| good	26.795 \| good	0.503 \| good	8.164 \| good	0.167 \| good
2026-06-29T09:00:00.000Z	27 \| good	4.239 \| good	12.612 \| good	29.22 \| good	0.426 \| good	8.043 \| good	0.153 \| good
2026-06-29T10:00:00.000Z	27 \| good	3.657 \| good	10.993 \| good	28.575 \| good	0.427 \| good	7.379 \| good	0.132 \| good
2026-06-29T11:00:00.000Z	27 \| good	3.742 \| good	12.133 \| good	28.664 \| good	0.427 \| good	8.107 \| good	0.124 \| good
2026-06-29T12:00:00.000Z	26 \| good	3.382 \| good	11.966 \| good	28.286 \| good	0.425 \| good	7.621 \| good	0.124 \| good
2026-06-29T13:00:00.000Z	28 \| good	3.34 \| good	12.438 \| good	29.601 \| good	0.425 \| good	5.42 \| good	0.122 \| good
2026-06-29T14:00:00.000Z	26 \| good	3.622 \| good	11.741 \| good	28.345 \| good	0.585 \| good	6.365 \| good	0.136 \| good
2026-06-29T15:00:00.000Z	28 \| good	4.728 \| good	10.275 \| good	29.533 \| good	0.587 \| good	6.321 \| good	0.139 \| good
2026-06-29T16:00:00.000Z	33 \| good	5.939 \| good	10.473 \| good	31.276 \| good	0.586 \| good	6.922 \| good	0.124 \| good
2026-06-29T17:00:00.000Z	29 \| good	4.871 \| good	10.166 \| good	30.548 \| good	0.425 \| good	9.76 \| good	0.173 \| good
2026-06-29T18:00:00.000Z	31 \| good	4.444 \| good	11.173 \| good	32.976 \| good	0.427 \| good	6.616 \| good	0.173 \| good
2026-06-29T15:00:00.000Z	39 \| good	5.772 \| good	9.575 \| good	42.228 \| good	0.118 \| good	1.317 \| good	0.092 \| good
2026-06-29T16:00:00.000Z	39 \| good	5.748 \| good	9.299 \| good	42.425 \| good	0.124 \| good	1.485 \| good	0.092 \| good
2026-06-29T17:00:00.000Z	39 \| good	5.46 \| good	9.26 \| good	42.088 \| good	0.127 \| good	1.758 \| good	0.092 \| good
2026-06-29T18:00:00.000Z	38 \| good	5.339 \| good	9.38 \| good	41.325 \| good	0.133 \| good	1.952 \| good	0.093 \| good
2026-06-29T19:00:00.000Z	36 \| good	5.217 \| good	9.298 \| good	39.444 \| good	0.143 \| good	2.294 \| good	0.094 \| good
2026-06-29T20:00:00.000Z	34 \| good	5.129 \| good	9.491 \| good	37.472 \| good	0.154 \| good	3.352 \| good	0.096 \| good
2026-06-29T21:00:00.000Z	31 \| good	5.027 \| good	9.985 \| good	33.557 \| good	0.211 \| good	4.955 \| good	0.097 \| good
2026-06-29T22:00:00.000Z	28 \| good	5.164 \| good	10.272 \| good	29.775 \| good	0.252 \| good	5.687 \| good	0.099 \| good
2026-06-29T23:00:00.000Z	27 \| good	5.416 \| good	10.374 \| good	27.618 \| good	0.218 \| good	4.614 \| good	0.098 \| good
2026-06-30T00:00:00.000Z	33 \| good	5.837 \| good	10.708 \| good	25.909 \| good	0.189 \| good	4.13 \| good	0.096 \| good
2026-06-30T01:00:00.000Z	33 \| good	6.136 \| good	11.255 \| good	23.985 \| good	0.182 \| good	4.275 \| good	0.095 \| good
2026-06-30T02:00:00.000Z	33 \| good	6.386 \| good	11.826 \| good	22.56 \| good	0.188 \| good	4.077 \| good	0.094 \| good
2026-06-30T03:00:00.000Z	38 \| good	6.504 \| good	11.942 \| good	21.821 \| good	0.194 \| good	3.877 \| good	0.094 \| good
2026-06-30T04:00:00.000Z	38 \| good	6.501 \| good	11.725 \| good	21.686 \| good	0.196 \| good	3.936 \| good	0.094 \| good
2026-06-30T05:00:00.000Z	38 \| good	6.536 \| good	11.603 \| good	22.219 \| good	0.21 \| good	4.197 \| good	0.093 \| good
2026-06-30T06:00:00.000Z	38 \| good	6.903 \| good	11.49 \| good	21.993 \| good	0.238 \| good	4.274 \| good	0.091 \| good
2026-06-30T07:00:00.000Z	38 \| good	6.867 \| good	11.302 \| good	23.463 \| good	0.248 \| good	4.494 \| good	0.095 \| good
2026-06-30T08:00:00.000Z	38 \| good	6.54 \| good	10.603 \| good	26.676 \| good	0.238 \| good	4.191 \| good	0.095 \| good
2026-06-30T09:00:00.000Z	33 \| good	5.948 \| good	9.91 \| good	29.1 \| good	0.209 \| good	3.465 \| good	0.093 \| good
2026-06-30T10:00:00.000Z	33 \| good	5.545 \| good	9.318 \| good	31.978 \| good	0.182 \| good	2.673 \| good	0.093 \| good
2026-06-30T11:00:00.000Z	33 \| good	5.368 \| good	8.509 \| good	36.489 \| good	0.151 \| good	1.967 \| good	0.091 \| good
2026-06-30T12:00:00.000Z	37 \| good	4.843 \| good	8.324 \| good	40.131 \| good	0.117 \| good	1.508 \| good	0.089 \| good
2026-06-30T13:00:00.000Z	39 \| good	4.509 \| good	7.687 \| good	42.156 \| good	0.107 \| good	1.443 \| good	0.088 \| good
2026-06-30T14:00:00.000Z	39 \| good	4.754 \| good	7.056 \| good	41.725 \| good	0.103 \| good	1.334 \| good	0.087 \| good
2026-06-30T15:00:00.000Z	38 \| good	4.307 \| good	7.069 \| good	41.101 \| good	0.107 \| good	1.439 \| good	0.085 \| good
2026-06-30T16:00:00.000Z	37 \| good	4.275 \| good	6.552 \| good	40.489 \| good	0.105 \| good	1.72 \| good	0.085 \| good
2026-06-30T17:00:00.000Z	35 \| good	4.137 \| good	6.661 \| good	37.956 \| good	0.109 \| good	2.23 \| good	0.085 \| good
2026-06-30T18:00:00.000Z	31 \| good	3.824 \| good	7.266 \| good	33.378 \| good	0.116 \| good	2.643 \| good	0.086 \| good
2026-06-30T19:00:00.000Z	29 \| good	3.936 \| good	7.014 \| good	31.241 \| good	0.113 \| good	2.501 \| good	0.087 \| good
2026-06-30T20:00:00.000Z	28 \| good	4.317 \| good	7.198 \| good	29.98 \| good	0.114 \| good	2.602 \| good	0.086 \| good
2026-06-30T21:00:00.000Z	26 \| good	4.272 \| good	7.724 \| good	28.258 \| good	0.145 \| good	3.115 \| good	0.088 \| good
2026-06-30T22:00:00.000Z	24 \| good	4.117 \| good	8.004 \| good	25.543 \| good	0.174 \| good	3.583 \| good	0.091 \| good
2026-06-30T23:00:00.000Z	22 \| good	4.096 \| good	7.836 \| good	23.996 \| good	0.183 \| good	3.692 \| good	0.094 \| good
2026-07-01T00:00:00.000Z	22 \| good	4.232 \| good	7.819 \| good	22.218 \| good	0.187 \| good	3.816 \| good	0.096 \| good
2026-07-01T01:00:00.000Z	22 \| good	4.349 \| good	7.665 \| good	20.176 \| good	0.199 \| good	3.676 \| good	0.097 \| good
2026-07-01T02:00:00.000Z	22 \| good	4.279 \| good	7.288 \| good	18.612 \| good	0.187 \| good	3.35 \| good	0.095 \| good
2026-07-01T03:00:00.000Z	22 \| good	4.07 \| good	6.718 \| good	17.43 \| good	0.147 \| good	3.127 \| good	0.093 \| good
2026-07-01T04:00:00.000Z	22 \| good	3.83 \| good	6.214 \| good	17.54 \| good	0.128 \| good	3.068 \| good	0.09 \| good
2026-07-01T05:00:00.000Z	22 \| good	3.746 \| good	5.883 \| good	17.991 \| good	0.116 \| good	2.781 \| good	0.087 \| good
2026-07-01T06:00:00.000Z	22 \| good	3.9 \| good	5.915 \| good	18.727 \| good	0.128 \| good	2.626 \| good	0.089 \| good
2026-07-01T07:00:00.000Z	22 \| good	3.818 \| good	5.942 \| good	21.533 \| good	0.159 \| good	2.877 \| good	0.091 \| good
2026-07-01T08:00:00.000Z	23 \| good	3.521 \| good	5.791 \| good	25.466 \| good	0.155 \| good	2.875 \| good	0.091 \| good
2026-07-01T09:00:00.000Z	26 \| good	3.579 \| good	5.879 \| good	28.36 \| good	0.14 \| good	2.58 \| good	0.091 \| good
2026-07-01T10:00:00.000Z	29 \| good	3.335 \| good	5.65 \| good	31.128 \| good	0.123 \| good	2.034 \| good	0.09 \| good
2026-07-01T11:00:00.000Z	31 \| good	3.063 \| good	4.94 \| good	33.117 \| good	0.116 \| good	1.676 \| good	0.09 \| good
2026-07-01T12:00:00.000Z	31 \| good	3.202 \| good	4.762 \| good	34.243 \| good	0.113 \| good	1.54 \| good	0.091 \| good
2026-07-01T13:00:00.000Z	34 \| good	2.939 \| good	4.384 \| good	36.624 \| good	0.103 \| good	1.356 \| good	0.09 \| good
2026-07-01T14:00:00.000Z	37 \| good	2.797 \| good	4.135 \| good	39.861 \| good	0.093 \| good	1.275 \| good	0.089 \| good

Hertfordshire, UK live air quality index now

Major air pollutants in Hertfordshire, UK

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Hertfordshire, UK air quality forecast and history

Get reliable air quality data to drive your business

Hertfordshire, UK air quality map: Track AQI near you

Air quality in cities of Hertfordshire, UK

Air quality in nearby states

Central Bedfordshire, UK

Greater London, UK

Halton, UK

Buckinghamshire, UK

Bedford, UK

Milton Keynes, UK

How accurate is Hertfordshire, UK air quality data?

Air quality levels in UK

Frequently asked questions

How often is the air quality data for Hertfordshire, UK updated?

When was the worst air quality at Hertfordshire, UK in the last 24 hrs?

When was the best air quality at Hertfordshire, UK in the last 24 hrs?

What is the current air quality in Hertfordshire, UK?

What pollutant is the most common in Hertfordshire, UK?

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

What is the current concentration of PM2.5 in Hertfordshire, UK?

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

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

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

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

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

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

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

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

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

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

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