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

The current PM10 concentration at Hertfordshire, UK is 21.027 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.81 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 49.348 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 5.919 ppb.

Live air quality index in Hertfordshire, UK today

Name: Live air pollution levels in Hertfordshire, UK today
Creator: Ambee

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

Live AQI (Air Quality Index)

Good

Hertfordshire, UK

Last updated: ... (Local time)

Major air pollutants in Hertfordshire, UK

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

9.09 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

21.84 μg/m³

155

255

425

605+

Ozone (O₃)

41.98 ppb

201

201+

Sulfur Dioxide (SO₂)

0.58 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

4.73 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.26 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

Hertfordshire, UK

Get Live Pollen Counts

Hertfordshire, UK

Scroll To Air Quality Map

Track live Hertfordshire, UK air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-30T02:00:00.000Z	33 \| good	6.358 \| good	16.578 \| good	26.897 \| good	0.836 \| good	5.696 \| good	0.488 \| good
2025-06-30T03:00:00.000Z	38 \| good	7.08 \| good	15.3 \| good	26.94 \| good	0.669 \| good	5.318 \| good	0.467 \| good
2025-06-30T04:00:00.000Z	33 \| good	6.353 \| good	20.44 \| good	24.761 \| good	0.561 \| good	9.969 \| good	0.529 \| good
2025-06-30T05:00:00.000Z	31 \| good	4.849 \| good	33.16 \| good	26.332 \| good	0.864 \| good	7.521 \| good	0.021 \| good
2025-06-30T06:00:00.000Z	38 \| good	6.546 \| good	16.28 \| good	11.287 \| good	0.932 \| good	9.052 \| good	0.013 \| good
2025-06-30T07:00:00.000Z	27 \| good	4.872 \| good	14.74 \| good	19.811 \| good	0.856 \| good	7.281 \| good	0.016 \| good
2025-06-30T08:00:00.000Z	22 \| good	4.06 \| good	12.64 \| good	21.227 \| good	0.86 \| good	5.952 \| good	0.011 \| good
2025-06-30T09:00:00.000Z	33 \| good	5.611 \| good	26.862 \| good	24.743 \| good	0.877 \| good	6.287 \| good	0.014 \| good
2025-06-30T10:00:00.000Z	33 \| good	5.824 \| good	14.851 \| good	17.859 \| good	1.023 \| good	8.721 \| good	0.01 \| good
2025-06-30T11:00:00.000Z	22 \| good	3.98 \| good	10.172 \| good	19.602 \| good	1.079 \| good	4.721 \| good	0.01 \| good
2025-06-30T12:00:00.000Z	33 \| good	6.294 \| good	10.555 \| good	26.201 \| good	1.153 \| good	5.265 \| good	0.01 \| good
2025-06-30T13:00:00.000Z	33 \| good	5.862 \| good	16.116 \| good	27.478 \| good	1.088 \| good	4.578 \| good	0.01 \| good
2025-06-30T14:00:00.000Z	33 \| good	5.747 \| good	27.687 \| good	25 \| good	1.091 \| good	4.292 \| good	0.01 \| good
2025-06-30T15:00:00.000Z	31 \| good	5.299 \| good	23.139 \| good	33.359 \| good	1.087 \| good	4.523 \| good	0.01 \| good
2025-06-30T16:00:00.000Z	46 \| good	6.737 \| good	17.717 \| good	50.31 \| good	0.922 \| good	4.114 \| good	0.013 \| good
2025-06-30T17:00:00.000Z	33 \| good	5.744 \| good	13.191 \| good	31.456 \| good	1.007 \| good	5.416 \| good	0.01 \| good
2025-06-30T18:00:00.000Z	33 \| good	6.145 \| good	18.871 \| good	29.79 \| good	0.935 \| good	5.123 \| good	0.011 \| good
2025-06-30T19:00:00.000Z	37 \| good	6.14 \| good	18.617 \| good	39.791 \| good	1.001 \| good	4.897 \| good	0.011 \| good
2025-06-30T20:00:00.000Z	35 \| good	6.25 \| good	25.732 \| good	37.951 \| good	1.073 \| good	6.666 \| good	0.016 \| good
2025-06-30T21:00:00.000Z	33 \| good	5.006 \| good	15.847 \| good	36.343 \| good	1.023 \| good	6.532 \| good	0.022 \| good
2025-06-30T22:00:00.000Z	33 \| good	5.637 \| good	12.316 \| good	35.026 \| good	1.013 \| good	5.915 \| good	0.013 \| good
2025-06-30T23:00:00.000Z	29 \| good	5.264 \| good	16.178 \| good	31.287 \| good	0.982 \| good	3.814 \| good	0.011 \| good
2025-07-01T00:00:00.000Z	39 \| good	4.986 \| good	16.745 \| good	41.552 \| good	0.887 \| good	8.479 \| good	0.221 \| good
2025-07-01T01:00:00.000Z	44 \| good	4.944 \| good	19.853 \| good	48.418 \| good	1 \| good	5.488 \| good	0.304 \| good
2025-07-01T02:00:00.000Z	47 \| good	5.243 \| good	13.049 \| good	51.09 \| good	0.96 \| good	5.65 \| good	0.304 \| good
2025-07-01T03:00:00.000Z	42 \| good	6.198 \| good	11.356 \| good	45.047 \| good	0.917 \| good	5.494 \| good	0.291 \| good
2025-07-01T04:00:00.000Z	37 \| good	6.263 \| good	23.838 \| good	39.781 \| good	0.986 \| good	7.986 \| good	0.298 \| good
2025-07-01T05:00:00.000Z	34 \| good	6.197 \| good	25.197 \| good	36.92 \| good	1.008 \| good	6.829 \| good	0.304 \| good
2025-07-01T06:00:00.000Z	38 \| good	6.884 \| good	21.023 \| good	25.381 \| good	0.98 \| good	10.734 \| good	0.312 \| good
2025-07-01T07:00:00.000Z	33 \| good	6.334 \| good	24.952 \| good	29.986 \| good	0.906 \| good	8.799 \| good	0.316 \| good
2025-07-01T08:00:00.000Z	38 \| good	7.257 \| good	20.409 \| good	25.803 \| good	1.022 \| good	7.835 \| good	0.306 \| good
2025-07-01T09:00:00.000Z	38 \| good	6.74 \| good	16.874 \| good	30.047 \| good	1.043 \| good	5.877 \| good	0.291 \| good
2025-07-01T10:00:00.000Z	38 \| good	6.875 \| good	14.227 \| good	29.693 \| good	0.98 \| good	6.806 \| good	0.224 \| good
2025-07-01T11:00:00.000Z	38 \| good	6.791 \| good	20.44 \| good	31.921 \| good	0.979 \| good	8.726 \| good	0.219 \| good
2025-07-01T12:00:00.000Z	44 \| good	8.344 \| good	23.251 \| good	36.927 \| good	0.989 \| good	11.468 \| good	0.224 \| good
2025-07-01T13:00:00.000Z	38 \| good	7.466 \| good	16.941 \| good	40.055 \| good	1.018 \| good	13.78 \| good	0.231 \| good
2025-07-01T14:00:00.000Z	44 \| good	7.562 \| good	17.769 \| good	36.73 \| good	1.151 \| good	14.762 \| good	0.231 \| good
2025-07-01T15:00:00.000Z	50 \| good	7.24 \| good	26.12 \| good	53.84 \| good	0.613 \| good	14.802 \| good	0.221 \| good
2025-07-01T16:00:00.000Z	48 \| good	7.677 \| good	23.004 \| good	52.449 \| good	0.713 \| good	14.729 \| good	0.226 \| good
2025-07-01T17:00:00.000Z	58 \| moderate	8.034 \| good	17.428 \| good	56.895 \| fine	0.794 \| good	13.196 \| good	0.213 \| good
2025-07-01T18:00:00.000Z	64 \| moderate	7.806 \| good	26.322 \| good	59.12 \| fine	0.71 \| good	13.223 \| good	0.228 \| good
2025-07-01T19:00:00.000Z	49 \| good	7.589 \| good	28.162 \| good	52.565 \| good	0.667 \| good	9.717 \| good	0.247 \| good
2025-07-01T20:00:00.000Z	46 \| good	7.996 \| good	29.183 \| good	49.891 \| good	0.816 \| good	6.813 \| good	0.301 \| good
2025-07-01T21:00:00.000Z	42 \| good	7.488 \| good	22.92 \| good	44.578 \| good	0.614 \| good	6.545 \| good	0.309 \| good
2025-07-01T22:00:00.000Z	49 \| good	9.246 \| good	22.854 \| good	51.986 \| good	0.809 \| good	7.034 \| good	0.238 \| good
2025-07-01T23:00:00.000Z	45 \| good	8.229 \| good	21.812 \| good	49.067 \| good	0.62 \| good	5.989 \| good	0.232 \| good
2025-07-02T00:00:00.000Z	52 \| moderate	9.516 \| good	23.337 \| good	42.438 \| good	0.579 \| good	2.922 \| good	0.258 \| good
2025-07-02T01:00:00.000Z	49 \| good	9.088 \| good	21.842 \| good	41.982 \| good	0.583 \| good	4.734 \| good	0.261 \| good
2025-07-02T00:00:00.000Z	33 \| good	5.62 \| good	7.253 \| good	25.468 \| good	0.215 \| good	4.682 \| good	0.118 \| good
2025-07-02T01:00:00.000Z	38 \| good	6.673 \| good	9.183 \| good	24.14 \| good	0.207 \| good	5.376 \| good	0.116 \| good
2025-07-02T02:00:00.000Z	38 \| good	7.21 \| good	10.13 \| good	23.83 \| good	0.193 \| good	4.781 \| good	0.115 \| good
2025-07-02T03:00:00.000Z	38 \| good	7.372 \| good	10.508 \| good	22.824 \| good	0.19 \| good	4.223 \| good	0.115 \| good
2025-07-02T04:00:00.000Z	44 \| good	7.653 \| good	11.081 \| good	22.289 \| good	0.18 \| good	3.726 \| good	0.115 \| good
2025-07-02T05:00:00.000Z	38 \| good	7.481 \| good	11.516 \| good	24.45 \| good	0.159 \| good	3.234 \| good	0.113 \| good
2025-07-02T06:00:00.000Z	38 \| good	6.697 \| good	11.591 \| good	21.848 \| good	0.181 \| good	3.786 \| good	0.114 \| good
2025-07-02T07:00:00.000Z	33 \| good	6.321 \| good	10.938 \| good	22.739 \| good	0.218 \| good	5.191 \| good	0.115 \| good
2025-07-02T08:00:00.000Z	33 \| good	5.986 \| good	10.098 \| good	22.756 \| good	0.253 \| good	5.545 \| good	0.117 \| good
2025-07-02T09:00:00.000Z	33 \| good	5.588 \| good	8.988 \| good	24.761 \| good	0.27 \| good	5.38 \| good	0.119 \| good
2025-07-02T10:00:00.000Z	28 \| good	5.439 \| good	9.991 \| good	30.442 \| good	0.234 \| good	4.845 \| good	0.119 \| good
2025-07-02T11:00:00.000Z	29 \| good	5.462 \| good	7.983 \| good	30.98 \| good	0.166 \| good	4.364 \| good	0.122 \| good
2025-07-02T12:00:00.000Z	33 \| good	5.736 \| good	7.176 \| good	28.374 \| good	0.129 \| good	4.709 \| good	0.122 \| good
2025-07-02T13:00:00.000Z	33 \| good	4.993 \| good	6.035 \| good	35.678 \| good	0.127 \| good	3.504 \| good	0.118 \| good
2025-07-02T14:00:00.000Z	41 \| good	4.775 \| good	5.661 \| good	44.228 \| good	0.087 \| good	1.868 \| good	0.115 \| good
2025-07-02T15:00:00.000Z	44 \| good	3.959 \| good	5.061 \| good	47.417 \| good	0.098 \| good	1.429 \| good	0.113 \| good
2025-07-02T16:00:00.000Z	44 \| good	3.271 \| good	4.913 \| good	47.724 \| good	0.107 \| good	1.529 \| good	0.114 \| good
2025-07-02T17:00:00.000Z	42 \| good	3.108 \| good	4.496 \| good	45.001 \| good	0.115 \| good	1.767 \| good	0.116 \| good
2025-07-02T18:00:00.000Z	40 \| good	2.975 \| good	4.118 \| good	42.948 \| good	0.131 \| good	1.885 \| good	0.115 \| good
2025-07-02T19:00:00.000Z	37 \| good	2.764 \| good	4.268 \| good	39.773 \| good	0.15 \| good	1.881 \| good	0.114 \| good
2025-07-02T20:00:00.000Z	35 \| good	2.956 \| good	4.562 \| good	37.988 \| good	0.201 \| good	2.122 \| good	0.115 \| good
2025-07-02T21:00:00.000Z	33 \| good	3.263 \| good	4.854 \| good	36.062 \| good	0.225 \| good	2.777 \| good	0.117 \| good
2025-07-02T22:00:00.000Z	31 \| good	3.385 \| good	5.036 \| good	33.692 \| good	0.236 \| good	3.144 \| good	0.119 \| good
2025-07-02T23:00:00.000Z	30 \| good	3.435 \| good	5.268 \| good	32.001 \| good	0.227 \| good	3.39 \| good	0.12 \| good
2025-07-03T00:00:00.000Z	28 \| good	3.356 \| good	5.508 \| good	30.122 \| good	0.241 \| good	3.361 \| good	0.12 \| good
2025-07-03T01:00:00.000Z	27 \| good	3.396 \| good	5.957 \| good	28.772 \| good	0.244 \| good	3.27 \| good	0.119 \| good
2025-07-03T02:00:00.000Z	25 \| good	3.559 \| good	6.313 \| good	26.96 \| good	0.251 \| good	3.554 \| good	0.12 \| good
2025-07-03T03:00:00.000Z	23 \| good	3.863 \| good	6.787 \| good	25.438 \| good	0.257 \| good	3.742 \| good	0.12 \| good
2025-07-03T04:00:00.000Z	23 \| good	4.484 \| good	7.534 \| good	24.846 \| good	0.249 \| good	4.068 \| good	0.121 \| good
2025-07-03T05:00:00.000Z	27 \| good	4.897 \| good	8.25 \| good	25.552 \| good	0.247 \| good	3.873 \| good	0.121 \| good
2025-07-03T06:00:00.000Z	27 \| good	4.917 \| good	8.162 \| good	24.858 \| good	0.26 \| good	3.443 \| good	0.12 \| good
2025-07-03T07:00:00.000Z	25 \| good	4.226 \| good	7.487 \| good	27.166 \| good	0.259 \| good	3.064 \| good	0.121 \| good
2025-07-03T08:00:00.000Z	28 \| good	3.52 \| good	5.903 \| good	30.301 \| good	0.233 \| good	2.449 \| good	0.118 \| good
2025-07-03T09:00:00.000Z	30 \| good	3.373 \| good	5.365 \| good	32.079 \| good	0.201 \| good	2.079 \| good	0.116 \| good
2025-07-03T10:00:00.000Z	33 \| good	3.37 \| good	4.832 \| good	35.819 \| good	0.186 \| good	1.71 \| good	0.117 \| good
2025-07-03T11:00:00.000Z	36 \| good	3.569 \| good	4.523 \| good	38.99 \| good	0.165 \| good	1.482 \| good	0.116 \| good
2025-07-03T12:00:00.000Z	39 \| good	3.562 \| good	4.56 \| good	41.799 \| good	0.142 \| good	1.343 \| good	0.116 \| good
2025-07-03T13:00:00.000Z	40 \| good	3.418 \| good	4.383 \| good	43.337 \| good	0.117 \| good	1.371 \| good	0.114 \| good
2025-07-03T14:00:00.000Z	40 \| good	3.285 \| good	4.548 \| good	43.032 \| good	0.104 \| good	1.346 \| good	0.114 \| good
2025-07-03T15:00:00.000Z	40 \| good	3.257 \| good	4.515 \| good	43.051 \| good	0.098 \| good	1.446 \| good	0.113 \| good
2025-07-03T16:00:00.000Z	39 \| good	3.043 \| good	4.345 \| good	42.157 \| good	0.09 \| good	1.699 \| good	0.113 \| good
2025-07-03T17:00:00.000Z	39 \| good	2.823 \| good	4.47 \| good	42.499 \| good	0.088 \| good	1.811 \| good	0.113 \| good
2025-07-03T18:00:00.000Z	38 \| good	2.837 \| good	4.406 \| good	40.781 \| good	0.109 \| good	2.038 \| good	0.114 \| good
2025-07-03T19:00:00.000Z	34 \| good	3.553 \| good	4.604 \| good	37.278 \| good	0.141 \| good	2.535 \| good	0.115 \| good
2025-07-03T20:00:00.000Z	31 \| good	3.703 \| good	4.954 \| good	34.219 \| good	0.172 \| good	3.578 \| good	0.117 \| good
2025-07-03T21:00:00.000Z	30 \| good	4.025 \| good	5.127 \| good	31.739 \| good	0.241 \| good	5.331 \| good	0.12 \| good
2025-07-03T22:00:00.000Z	25 \| good	4.306 \| good	5.511 \| good	27.376 \| good	0.333 \| good	6.609 \| good	0.123 \| good
2025-07-03T23:00:00.000Z	24 \| good	4.437 \| good	5.584 \| good	26.317 \| good	0.292 \| good	5.923 \| good	0.123 \| 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
Bishop's Stortford, Hertfordshire	60 Moderate	13.74μg/m³ Fine	21.36μg/m³ Good	46.67ppb Good	0.60ppb Good	4.70ppb Good	0.23ppm Good
Sawbridgeworth, Hertfordshire	60 Moderate	13.74μg/m³ Fine	21.36μg/m³ Good	46.67ppb Good	0.60ppb Good	4.70ppb Good	0.23ppm Good
Royston, Hertfordshire	58 Moderate	13.27μg/m³ Fine	19.48μg/m³ Good	29.91ppb Good	0.58ppb Good	5.21ppb Good	0.23ppm Good
Ware, Hertfordshire	54 Moderate	10.84μg/m³ Good	23.64μg/m³ Good	44.34ppb Good	0.61ppb Good	4.68ppb Good	0.23ppm Good
Baldock, Hertfordshire	52 Moderate	9.85μg/m³ Good	29.77μg/m³ Good	49.34ppb Good	0.61ppb Good	4.78ppb Good	0.23ppm Good
Letchworth, Hertfordshire	52 Moderate	9.85μg/m³ Good	29.77μg/m³ Good	49.34ppb Good	0.61ppb Good	4.78ppb Good	0.23ppm Good
Stevenage, Hertfordshire	52 Moderate	9.85μg/m³ Good	29.77μg/m³ Good	49.34ppb Good	0.61ppb Good	4.78ppb Good	0.23ppm Good
Hitchin, Hertfordshire	52 Moderate	9.85μg/m³ Good	29.77μg/m³ Good	49.34ppb Good	0.61ppb Good	4.78ppb Good	0.23ppm Good
Hatfield, Hertfordshire	49 Good	8.88μg/m³ Good	17.29μg/m³ Good	46.76ppb Good	0.63ppb Good	5.45ppb Good	0.23ppm Good
Cheshunt, Hertfordshire	45 Good	7.70μg/m³ Good	21.60μg/m³ Good	49.45ppb Good	0.65ppb Good	4.10ppb Good	0.23ppm Good
Potters Bar, Hertfordshire	44 Good	8.42μg/m³ Good	17.20μg/m³ Good	44.24ppb Good	0.63ppb Good	4.64ppb Good	0.23ppm Good
Waltham Cross, Hertfordshire	44 Good	8.45μg/m³ Good	19.14μg/m³ Good	44.28ppb Good	0.60ppb Good	6.37ppb Good	0.23ppm Good
Watford, Hertfordshire	44 Good	8.39μg/m³ Good	16.86μg/m³ Good	46.12ppb Good	0.64ppb Good	6.40ppb Good	0.23ppm Good
Hertford, Hertfordshire	44 Good	7.86μg/m³ Good	17.52μg/m³ Good	48.37ppb Good	0.61ppb Good	5.16ppb Good	0.23ppm Good
Hoddesdon, Hertfordshire	44 Good	7.86μg/m³ Good	17.52μg/m³ Good	48.37ppb Good	0.61ppb Good	5.16ppb Good	0.23ppm Good
Welwyn Garden City, Hertfordshire	45 Good	8.23μg/m³ Good	21.81μg/m³ Good	49.07ppb Good	0.62ppb Good	5.99ppb Good	0.23ppm Good
Harpenden, Hertfordshire	44 Good	7.97μg/m³ Good	25.65μg/m³ Good	43.50ppb Good	0.62ppb Good	6.30ppb Good	0.23ppm Good
St Albans, Hertfordshire	44 Good	7.94μg/m³ Good	21.34μg/m³ Good	46.69ppb Good	0.65ppb Good	4.49ppb Good	0.23ppm Good
Berkhamsted, Hertfordshire	44 Good	7.76μg/m³ Good	18.83μg/m³ Good	45.44ppb Good	0.63ppb Good	5.23ppb Good	0.23ppm Good
Borehamwood, Hertfordshire	43 Good	7.23μg/m³ Good	14.26μg/m³ Good	46.38ppb Good	0.64ppb Good	3.26ppb Good	0.23ppm Good
Hemel Hempstead, Hertfordshire	44 Good	7.75μg/m³ Good	26.10μg/m³ Good	45.33ppb Good	0.63ppb Good	6.68ppb Good	0.23ppm Good
Abbots Langley, Hertfordshire	44 Good	7.75μg/m³ Good	26.10μg/m³ Good	45.33ppb Good	0.63ppb Good	6.68ppb Good	0.23ppm Good
Chorleywood, Hertfordshire	44 Good	7.73μg/m³ Good	17.43μg/m³ Good	45.35ppb Good	0.63ppb Good	5.03ppb Good	0.23ppm Good
Rickmansworth, Hertfordshire	44 Good	7.73μg/m³ Good	17.43μg/m³ Good	45.35ppb Good	0.63ppb Good	5.03ppb Good	0.23ppm Good
Bushey, Hertfordshire	44 Good	7.71μg/m³ Good	18.91μg/m³ Good	45.18ppb Good	0.67ppb Good	3.54ppb Good	0.23ppm Good
Tring, Hertfordshire	42 Good	7.25μg/m³ Good	27.99μg/m³ Good	44.75ppb Good	0.62ppb Good	6.61ppb Good	0.23ppm Good

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

0.24ppm

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 06:00:00 on 2025-07-01.

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 11:00:00 on 2025-06-30.

What is the current air quality in Hertfordshire, UK?

The current air quality in Hertfordshire, UK is 49, 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 8.872 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 21.027 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.238 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.81 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 49.348 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 5.919 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-30T02:00:00.000Z	33 \| good	6.358 \| good	16.578 \| good	26.897 \| good	0.836 \| good	5.696 \| good	0.488 \| good
2025-06-30T03:00:00.000Z	38 \| good	7.08 \| good	15.3 \| good	26.94 \| good	0.669 \| good	5.318 \| good	0.467 \| good
2025-06-30T04:00:00.000Z	33 \| good	6.353 \| good	20.44 \| good	24.761 \| good	0.561 \| good	9.969 \| good	0.529 \| good
2025-06-30T05:00:00.000Z	31 \| good	4.849 \| good	33.16 \| good	26.332 \| good	0.864 \| good	7.521 \| good	0.021 \| good
2025-06-30T06:00:00.000Z	38 \| good	6.546 \| good	16.28 \| good	11.287 \| good	0.932 \| good	9.052 \| good	0.013 \| good
2025-06-30T07:00:00.000Z	27 \| good	4.872 \| good	14.74 \| good	19.811 \| good	0.856 \| good	7.281 \| good	0.016 \| good
2025-06-30T08:00:00.000Z	22 \| good	4.06 \| good	12.64 \| good	21.227 \| good	0.86 \| good	5.952 \| good	0.011 \| good
2025-06-30T09:00:00.000Z	33 \| good	5.611 \| good	26.862 \| good	24.743 \| good	0.877 \| good	6.287 \| good	0.014 \| good
2025-06-30T10:00:00.000Z	33 \| good	5.824 \| good	14.851 \| good	17.859 \| good	1.023 \| good	8.721 \| good	0.01 \| good
2025-06-30T11:00:00.000Z	22 \| good	3.98 \| good	10.172 \| good	19.602 \| good	1.079 \| good	4.721 \| good	0.01 \| good
2025-06-30T12:00:00.000Z	33 \| good	6.294 \| good	10.555 \| good	26.201 \| good	1.153 \| good	5.265 \| good	0.01 \| good
2025-06-30T13:00:00.000Z	33 \| good	5.862 \| good	16.116 \| good	27.478 \| good	1.088 \| good	4.578 \| good	0.01 \| good
2025-06-30T14:00:00.000Z	33 \| good	5.747 \| good	27.687 \| good	25 \| good	1.091 \| good	4.292 \| good	0.01 \| good
2025-06-30T15:00:00.000Z	31 \| good	5.299 \| good	23.139 \| good	33.359 \| good	1.087 \| good	4.523 \| good	0.01 \| good
2025-06-30T16:00:00.000Z	46 \| good	6.737 \| good	17.717 \| good	50.31 \| good	0.922 \| good	4.114 \| good	0.013 \| good
2025-06-30T17:00:00.000Z	33 \| good	5.744 \| good	13.191 \| good	31.456 \| good	1.007 \| good	5.416 \| good	0.01 \| good
2025-06-30T18:00:00.000Z	33 \| good	6.145 \| good	18.871 \| good	29.79 \| good	0.935 \| good	5.123 \| good	0.011 \| good
2025-06-30T19:00:00.000Z	37 \| good	6.14 \| good	18.617 \| good	39.791 \| good	1.001 \| good	4.897 \| good	0.011 \| good
2025-06-30T20:00:00.000Z	35 \| good	6.25 \| good	25.732 \| good	37.951 \| good	1.073 \| good	6.666 \| good	0.016 \| good
2025-06-30T21:00:00.000Z	33 \| good	5.006 \| good	15.847 \| good	36.343 \| good	1.023 \| good	6.532 \| good	0.022 \| good
2025-06-30T22:00:00.000Z	33 \| good	5.637 \| good	12.316 \| good	35.026 \| good	1.013 \| good	5.915 \| good	0.013 \| good
2025-06-30T23:00:00.000Z	29 \| good	5.264 \| good	16.178 \| good	31.287 \| good	0.982 \| good	3.814 \| good	0.011 \| good
2025-07-01T00:00:00.000Z	39 \| good	4.986 \| good	16.745 \| good	41.552 \| good	0.887 \| good	8.479 \| good	0.221 \| good
2025-07-01T01:00:00.000Z	44 \| good	4.944 \| good	19.853 \| good	48.418 \| good	1 \| good	5.488 \| good	0.304 \| good
2025-07-01T02:00:00.000Z	47 \| good	5.243 \| good	13.049 \| good	51.09 \| good	0.96 \| good	5.65 \| good	0.304 \| good
2025-07-01T03:00:00.000Z	42 \| good	6.198 \| good	11.356 \| good	45.047 \| good	0.917 \| good	5.494 \| good	0.291 \| good
2025-07-01T04:00:00.000Z	37 \| good	6.263 \| good	23.838 \| good	39.781 \| good	0.986 \| good	7.986 \| good	0.298 \| good
2025-07-01T05:00:00.000Z	34 \| good	6.197 \| good	25.197 \| good	36.92 \| good	1.008 \| good	6.829 \| good	0.304 \| good
2025-07-01T06:00:00.000Z	38 \| good	6.884 \| good	21.023 \| good	25.381 \| good	0.98 \| good	10.734 \| good	0.312 \| good
2025-07-01T07:00:00.000Z	33 \| good	6.334 \| good	24.952 \| good	29.986 \| good	0.906 \| good	8.799 \| good	0.316 \| good
2025-07-01T08:00:00.000Z	38 \| good	7.257 \| good	20.409 \| good	25.803 \| good	1.022 \| good	7.835 \| good	0.306 \| good
2025-07-01T09:00:00.000Z	38 \| good	6.74 \| good	16.874 \| good	30.047 \| good	1.043 \| good	5.877 \| good	0.291 \| good
2025-07-01T10:00:00.000Z	38 \| good	6.875 \| good	14.227 \| good	29.693 \| good	0.98 \| good	6.806 \| good	0.224 \| good
2025-07-01T11:00:00.000Z	38 \| good	6.791 \| good	20.44 \| good	31.921 \| good	0.979 \| good	8.726 \| good	0.219 \| good
2025-07-01T12:00:00.000Z	44 \| good	8.344 \| good	23.251 \| good	36.927 \| good	0.989 \| good	11.468 \| good	0.224 \| good
2025-07-01T13:00:00.000Z	38 \| good	7.466 \| good	16.941 \| good	40.055 \| good	1.018 \| good	13.78 \| good	0.231 \| good
2025-07-01T14:00:00.000Z	44 \| good	7.562 \| good	17.769 \| good	36.73 \| good	1.151 \| good	14.762 \| good	0.231 \| good
2025-07-01T15:00:00.000Z	50 \| good	7.24 \| good	26.12 \| good	53.84 \| good	0.613 \| good	14.802 \| good	0.221 \| good
2025-07-01T16:00:00.000Z	48 \| good	7.677 \| good	23.004 \| good	52.449 \| good	0.713 \| good	14.729 \| good	0.226 \| good
2025-07-01T17:00:00.000Z	58 \| moderate	8.034 \| good	17.428 \| good	56.895 \| fine	0.794 \| good	13.196 \| good	0.213 \| good
2025-07-01T18:00:00.000Z	64 \| moderate	7.806 \| good	26.322 \| good	59.12 \| fine	0.71 \| good	13.223 \| good	0.228 \| good
2025-07-01T19:00:00.000Z	49 \| good	7.589 \| good	28.162 \| good	52.565 \| good	0.667 \| good	9.717 \| good	0.247 \| good
2025-07-01T20:00:00.000Z	46 \| good	7.996 \| good	29.183 \| good	49.891 \| good	0.816 \| good	6.813 \| good	0.301 \| good
2025-07-01T21:00:00.000Z	42 \| good	7.488 \| good	22.92 \| good	44.578 \| good	0.614 \| good	6.545 \| good	0.309 \| good
2025-07-01T22:00:00.000Z	49 \| good	9.246 \| good	22.854 \| good	51.986 \| good	0.809 \| good	7.034 \| good	0.238 \| good
2025-07-01T23:00:00.000Z	45 \| good	8.229 \| good	21.812 \| good	49.067 \| good	0.62 \| good	5.989 \| good	0.232 \| good
2025-07-02T00:00:00.000Z	52 \| moderate	9.516 \| good	23.337 \| good	42.438 \| good	0.579 \| good	2.922 \| good	0.258 \| good
2025-07-02T01:00:00.000Z	49 \| good	9.088 \| good	21.842 \| good	41.982 \| good	0.583 \| good	4.734 \| good	0.261 \| good
2025-07-02T00:00:00.000Z	33 \| good	5.62 \| good	7.253 \| good	25.468 \| good	0.215 \| good	4.682 \| good	0.118 \| good
2025-07-02T01:00:00.000Z	38 \| good	6.673 \| good	9.183 \| good	24.14 \| good	0.207 \| good	5.376 \| good	0.116 \| good
2025-07-02T02:00:00.000Z	38 \| good	7.21 \| good	10.13 \| good	23.83 \| good	0.193 \| good	4.781 \| good	0.115 \| good
2025-07-02T03:00:00.000Z	38 \| good	7.372 \| good	10.508 \| good	22.824 \| good	0.19 \| good	4.223 \| good	0.115 \| good
2025-07-02T04:00:00.000Z	44 \| good	7.653 \| good	11.081 \| good	22.289 \| good	0.18 \| good	3.726 \| good	0.115 \| good
2025-07-02T05:00:00.000Z	38 \| good	7.481 \| good	11.516 \| good	24.45 \| good	0.159 \| good	3.234 \| good	0.113 \| good
2025-07-02T06:00:00.000Z	38 \| good	6.697 \| good	11.591 \| good	21.848 \| good	0.181 \| good	3.786 \| good	0.114 \| good
2025-07-02T07:00:00.000Z	33 \| good	6.321 \| good	10.938 \| good	22.739 \| good	0.218 \| good	5.191 \| good	0.115 \| good
2025-07-02T08:00:00.000Z	33 \| good	5.986 \| good	10.098 \| good	22.756 \| good	0.253 \| good	5.545 \| good	0.117 \| good
2025-07-02T09:00:00.000Z	33 \| good	5.588 \| good	8.988 \| good	24.761 \| good	0.27 \| good	5.38 \| good	0.119 \| good
2025-07-02T10:00:00.000Z	28 \| good	5.439 \| good	9.991 \| good	30.442 \| good	0.234 \| good	4.845 \| good	0.119 \| good
2025-07-02T11:00:00.000Z	29 \| good	5.462 \| good	7.983 \| good	30.98 \| good	0.166 \| good	4.364 \| good	0.122 \| good
2025-07-02T12:00:00.000Z	33 \| good	5.736 \| good	7.176 \| good	28.374 \| good	0.129 \| good	4.709 \| good	0.122 \| good
2025-07-02T13:00:00.000Z	33 \| good	4.993 \| good	6.035 \| good	35.678 \| good	0.127 \| good	3.504 \| good	0.118 \| good
2025-07-02T14:00:00.000Z	41 \| good	4.775 \| good	5.661 \| good	44.228 \| good	0.087 \| good	1.868 \| good	0.115 \| good
2025-07-02T15:00:00.000Z	44 \| good	3.959 \| good	5.061 \| good	47.417 \| good	0.098 \| good	1.429 \| good	0.113 \| good
2025-07-02T16:00:00.000Z	44 \| good	3.271 \| good	4.913 \| good	47.724 \| good	0.107 \| good	1.529 \| good	0.114 \| good
2025-07-02T17:00:00.000Z	42 \| good	3.108 \| good	4.496 \| good	45.001 \| good	0.115 \| good	1.767 \| good	0.116 \| good
2025-07-02T18:00:00.000Z	40 \| good	2.975 \| good	4.118 \| good	42.948 \| good	0.131 \| good	1.885 \| good	0.115 \| good
2025-07-02T19:00:00.000Z	37 \| good	2.764 \| good	4.268 \| good	39.773 \| good	0.15 \| good	1.881 \| good	0.114 \| good
2025-07-02T20:00:00.000Z	35 \| good	2.956 \| good	4.562 \| good	37.988 \| good	0.201 \| good	2.122 \| good	0.115 \| good
2025-07-02T21:00:00.000Z	33 \| good	3.263 \| good	4.854 \| good	36.062 \| good	0.225 \| good	2.777 \| good	0.117 \| good
2025-07-02T22:00:00.000Z	31 \| good	3.385 \| good	5.036 \| good	33.692 \| good	0.236 \| good	3.144 \| good	0.119 \| good
2025-07-02T23:00:00.000Z	30 \| good	3.435 \| good	5.268 \| good	32.001 \| good	0.227 \| good	3.39 \| good	0.12 \| good
2025-07-03T00:00:00.000Z	28 \| good	3.356 \| good	5.508 \| good	30.122 \| good	0.241 \| good	3.361 \| good	0.12 \| good
2025-07-03T01:00:00.000Z	27 \| good	3.396 \| good	5.957 \| good	28.772 \| good	0.244 \| good	3.27 \| good	0.119 \| good
2025-07-03T02:00:00.000Z	25 \| good	3.559 \| good	6.313 \| good	26.96 \| good	0.251 \| good	3.554 \| good	0.12 \| good
2025-07-03T03:00:00.000Z	23 \| good	3.863 \| good	6.787 \| good	25.438 \| good	0.257 \| good	3.742 \| good	0.12 \| good
2025-07-03T04:00:00.000Z	23 \| good	4.484 \| good	7.534 \| good	24.846 \| good	0.249 \| good	4.068 \| good	0.121 \| good
2025-07-03T05:00:00.000Z	27 \| good	4.897 \| good	8.25 \| good	25.552 \| good	0.247 \| good	3.873 \| good	0.121 \| good
2025-07-03T06:00:00.000Z	27 \| good	4.917 \| good	8.162 \| good	24.858 \| good	0.26 \| good	3.443 \| good	0.12 \| good
2025-07-03T07:00:00.000Z	25 \| good	4.226 \| good	7.487 \| good	27.166 \| good	0.259 \| good	3.064 \| good	0.121 \| good
2025-07-03T08:00:00.000Z	28 \| good	3.52 \| good	5.903 \| good	30.301 \| good	0.233 \| good	2.449 \| good	0.118 \| good
2025-07-03T09:00:00.000Z	30 \| good	3.373 \| good	5.365 \| good	32.079 \| good	0.201 \| good	2.079 \| good	0.116 \| good
2025-07-03T10:00:00.000Z	33 \| good	3.37 \| good	4.832 \| good	35.819 \| good	0.186 \| good	1.71 \| good	0.117 \| good
2025-07-03T11:00:00.000Z	36 \| good	3.569 \| good	4.523 \| good	38.99 \| good	0.165 \| good	1.482 \| good	0.116 \| good
2025-07-03T12:00:00.000Z	39 \| good	3.562 \| good	4.56 \| good	41.799 \| good	0.142 \| good	1.343 \| good	0.116 \| good
2025-07-03T13:00:00.000Z	40 \| good	3.418 \| good	4.383 \| good	43.337 \| good	0.117 \| good	1.371 \| good	0.114 \| good
2025-07-03T14:00:00.000Z	40 \| good	3.285 \| good	4.548 \| good	43.032 \| good	0.104 \| good	1.346 \| good	0.114 \| good
2025-07-03T15:00:00.000Z	40 \| good	3.257 \| good	4.515 \| good	43.051 \| good	0.098 \| good	1.446 \| good	0.113 \| good
2025-07-03T16:00:00.000Z	39 \| good	3.043 \| good	4.345 \| good	42.157 \| good	0.09 \| good	1.699 \| good	0.113 \| good
2025-07-03T17:00:00.000Z	39 \| good	2.823 \| good	4.47 \| good	42.499 \| good	0.088 \| good	1.811 \| good	0.113 \| good
2025-07-03T18:00:00.000Z	38 \| good	2.837 \| good	4.406 \| good	40.781 \| good	0.109 \| good	2.038 \| good	0.114 \| good
2025-07-03T19:00:00.000Z	34 \| good	3.553 \| good	4.604 \| good	37.278 \| good	0.141 \| good	2.535 \| good	0.115 \| good
2025-07-03T20:00:00.000Z	31 \| good	3.703 \| good	4.954 \| good	34.219 \| good	0.172 \| good	3.578 \| good	0.117 \| good
2025-07-03T21:00:00.000Z	30 \| good	4.025 \| good	5.127 \| good	31.739 \| good	0.241 \| good	5.331 \| good	0.12 \| good
2025-07-03T22:00:00.000Z	25 \| good	4.306 \| good	5.511 \| good	27.376 \| good	0.333 \| good	6.609 \| good	0.123 \| good
2025-07-03T23:00:00.000Z	24 \| good	4.437 \| good	5.584 \| good	26.317 \| good	0.292 \| good	5.923 \| good	0.123 \| good

Live air quality index in Hertfordshire, UK today

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?