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

The current PM10 concentration at Hertfordshire, UK is 28.393 μg/m3.

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

The current sulfur dioxide (SO2) concentration at Hertfordshire, UK is 0.743 ppb.

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

The current ozone (O3) concentration at Hertfordshire, UK is 37.785 ppm.

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

The current nitrogen dioxide (NO2) concentration at Hertfordshire, UK is 12.204 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 8.619 μg/m3.

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

Live AQI (Air Quality Index)

Good

Hertfordshire, UK

Last updated: ... (Local time)

Major air pollutants in Hertfordshire, UK

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

9.33 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

29.87 μg/m³

155

255

425

605+

Ozone (O₃)

42.86 ppb

201

201+

Sulfur Dioxide (SO₂)

0.64 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

12.47 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.01 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Hertfordshire, UK

Get Live Pollen Counts

Hertfordshire, UK

Scroll To Air Quality Map

Track live Hertfordshire, UK air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-08-12T18:00:00.000Z	67 \| moderate	6.929 \| good	28.7 \| good	60.131 \| fine	1.037 \| good	5.907 \| good	0.01 \| good
2026-08-12T19:00:00.000Z	50 \| good	5.957 \| good	28.7 \| good	54.369 \| good	0.984 \| good	7.024 \| good	0.011 \| good
2026-08-12T20:00:00.000Z	71 \| moderate	8.429 \| good	20.631 \| good	60.707 \| fine	0.733 \| good	8.343 \| good	0.011 \| good
2026-08-12T21:00:00.000Z	64 \| moderate	6.344 \| good	19.676 \| good	58.998 \| fine	1.065 \| good	6.463 \| good	0.008 \| good
2026-08-12T22:00:00.000Z	67 \| moderate	6.352 \| good	20.11 \| good	59.515 \| fine	1.13 \| good	7.475 \| good	0.009 \| good
2026-08-12T23:00:00.000Z	54 \| moderate	7.204 \| good	21.234 \| good	55.622 \| fine	1.058 \| good	6.019 \| good	0.009 \| good
2026-08-13T00:00:00.000Z	50 \| good	5.348 \| good	19.231 \| good	53.746 \| good	1.192 \| good	6.715 \| good	0.165 \| good
2026-08-13T01:00:00.000Z	58 \| moderate	8.28 \| good	31.233 \| good	56.691 \| fine	0.852 \| good	8.188 \| good	0.153 \| good
2026-08-13T02:00:00.000Z	46 \| good	8.48 \| good	25.421 \| good	49.765 \| good	0.763 \| good	9.781 \| good	0.158 \| good
2026-08-13T03:00:00.000Z	50 \| good	6.691 \| good	29.088 \| good	53.81 \| good	0.693 \| good	9.131 \| good	0.158 \| good
2026-08-13T04:00:00.000Z	44 \| good	6.871 \| good	28.794 \| good	47.38 \| good	0.831 \| good	8.622 \| good	0.165 \| good
2026-08-13T05:00:00.000Z	45 \| good	7.509 \| good	23.33 \| good	48.632 \| good	0.592 \| good	11.412 \| good	0.009 \| good
2026-08-13T06:00:00.000Z	49 \| good	9.173 \| good	29.834 \| good	36.683 \| good	0.775 \| good	9.014 \| good	0.009 \| good
2026-08-13T07:00:00.000Z	44 \| good	8.12 \| good	20.645 \| good	30.392 \| good	0.68 \| good	10.101 \| good	0.009 \| good
2026-08-13T08:00:00.000Z	54 \| moderate	10.787 \| good	24.773 \| good	39.33 \| good	0.69 \| good	13.027 \| good	0.009 \| good
2026-08-13T09:00:00.000Z	49 \| good	8.643 \| good	16.915 \| good	39.772 \| good	0.815 \| good	11.037 \| good	0.01 \| good
2026-08-13T10:00:00.000Z	47 \| good	7.268 \| good	35.002 \| good	51.119 \| good	5.912 \| good	10.396 \| good	0.009 \| good
2026-08-13T11:00:00.000Z	38 \| good	6.786 \| good	17.051 \| good	37.697 \| good	1.011 \| good	10.294 \| good	0.009 \| good
2026-08-13T12:00:00.000Z	44 \| good	7.532 \| good	30.361 \| good	33.149 \| good	1.101 \| good	8.576 \| good	0.009 \| good
2026-08-13T13:00:00.000Z	56 \| moderate	11.581 \| good	36.904 \| good	34.892 \| good	0.821 \| good	10.19 \| good	0.01 \| good
2026-08-13T14:00:00.000Z	38 \| good	7.325 \| good	29.509 \| good	36.202 \| good	1.025 \| good	10.739 \| good	0.009 \| good
2026-08-13T15:00:00.000Z	44 \| good	8.497 \| good	32.04 \| good	45.189 \| good	0.738 \| good	9.872 \| good	0.01 \| good
2026-08-13T16:00:00.000Z	44 \| good	7.389 \| good	22.602 \| good	47.5 \| good	0.739 \| good	22.469 \| good	0.01 \| good
2026-08-13T17:00:00.000Z	97 \| moderate	6.195 \| good	27.2 \| good	68.669 \| fine	0.959 \| good	13.897 \| good	0.009 \| good
2026-08-13T18:00:00.000Z	87 \| moderate	7.067 \| good	28.225 \| good	66.387 \| fine	0.884 \| good	14.047 \| good	0.013 \| good
2026-08-13T19:00:00.000Z	45 \| good	6.23 \| good	36.2 \| good	48.88 \| good	0.733 \| good	15.881 \| good	0.012 \| good
2026-08-13T20:00:00.000Z	90 \| moderate	7.77 \| good	24.248 \| good	66.874 \| fine	0.74 \| good	17.071 \| good	0.012 \| good
2026-08-13T21:00:00.000Z	52 \| moderate	9.838 \| good	24.488 \| good	49.956 \| good	0.666 \| good	17.332 \| good	0.014 \| good
2026-08-13T22:00:00.000Z	74 \| moderate	9.441 \| good	18.908 \| good	61.578 \| fine	0.808 \| good	17.118 \| good	0.01 \| good
2026-08-13T23:00:00.000Z	67 \| moderate	7.767 \| good	21.453 \| good	60.156 \| fine	0.737 \| good	22.349 \| good	0.008 \| good
2026-08-14T00:00:00.000Z	80 \| moderate	7.096 \| good	31.319 \| good	63.958 \| fine	0.845 \| good	16.62 \| good	0.151 \| good
2026-08-14T01:00:00.000Z	58 \| moderate	9.585 \| good	26.468 \| good	56.636 \| fine	0.677 \| good	11.54 \| good	0.139 \| good
2026-08-14T02:00:00.000Z	58 \| moderate	10 \| good	27.639 \| good	56.88 \| fine	0.848 \| good	6.629 \| good	0.142 \| good
2026-08-14T03:00:00.000Z	50 \| good	8.158 \| good	23.86 \| good	53.688 \| good	0.895 \| good	7.517 \| good	0.148 \| good
2026-08-14T04:00:00.000Z	52 \| moderate	10.487 \| good	28.98 \| good	48.117 \| good	0.891 \| good	7.273 \| good	0.148 \| good
2026-08-14T05:00:00.000Z	52 \| moderate	9.96 \| good	22.506 \| good	50.731 \| good	0.748 \| good	8.974 \| good	0.009 \| good
2026-08-14T06:00:00.000Z	49 \| good	7.386 \| good	23.974 \| good	52.52 \| good	0.676 \| good	18.967 \| good	0.009 \| good
2026-08-14T07:00:00.000Z	44 \| good	7.571 \| good	28.549 \| good	46.758 \| good	0.75 \| good	19.214 \| good	0.009 \| good
2026-08-14T08:00:00.000Z	45 \| good	7.715 \| good	25.488 \| good	49.434 \| good	0.704 \| good	14.785 \| good	0.009 \| good
2026-08-14T09:00:00.000Z	44 \| good	7.532 \| good	24.974 \| good	40.764 \| good	0.648 \| good	15.228 \| good	0.009 \| good
2026-08-14T10:00:00.000Z	38 \| good	7.182 \| good	21.456 \| good	34.117 \| good	0.755 \| good	12.444 \| good	0.009 \| good
2026-08-14T11:00:00.000Z	38 \| good	7.311 \| good	22.027 \| good	33.182 \| good	0.669 \| good	10.538 \| good	0.01 \| good
2026-08-14T12:00:00.000Z	38 \| good	7.448 \| good	28.786 \| good	29.33 \| good	0.755 \| good	11.484 \| good	0.01 \| good
2026-08-14T13:00:00.000Z	49 \| good	8.917 \| good	32.404 \| good	37.713 \| good	0.612 \| good	9.88 \| good	0.01 \| good
2026-08-14T14:00:00.000Z	44 \| good	8.294 \| good	27.893 \| good	39.518 \| good	0.648 \| good	9.578 \| good	0.011 \| good
2026-08-14T15:00:00.000Z	44 \| good	8.072 \| good	26.245 \| good	35.995 \| good	0.648 \| good	9.86 \| good	0.01 \| good
2026-08-14T16:00:00.000Z	49 \| good	8.579 \| good	32.822 \| good	40.774 \| good	0.648 \| good	11.068 \| good	0.01 \| good
2026-08-14T17:00:00.000Z	49 \| good	8.988 \| good	23.333 \| good	40.369 \| good	0.648 \| good	14.162 \| good	0.01 \| good
2026-08-14T17:00:00.000Z	49 \| good	9.328 \| good	29.869 \| good	42.859 \| good	0.638 \| good	12.472 \| good	0.01 \| good
2026-08-14T18:00:00.000Z	34 \| good	3.668 \| good	6.613 \| good	37.275 \| good	0.111 \| good	2.23 \| good	0.109 \| good
2026-08-14T19:00:00.000Z	33 \| good	3.599 \| good	6.973 \| good	36.006 \| good	0.133 \| good	3.114 \| good	0.11 \| good
2026-08-14T20:00:00.000Z	29 \| good	3.894 \| good	7.171 \| good	31.212 \| good	0.181 \| good	4.837 \| good	0.115 \| good
2026-08-14T21:00:00.000Z	27 \| good	4.334 \| good	8.355 \| good	28.716 \| good	0.226 \| good	7.069 \| good	0.123 \| good
2026-08-14T22:00:00.000Z	27 \| good	4.746 \| good	7.119 \| good	26.452 \| good	0.21 \| good	5.423 \| good	0.124 \| good
2026-08-14T23:00:00.000Z	27 \| good	4.586 \| good	6.191 \| good	26.787 \| good	0.187 \| good	4.805 \| good	0.118 \| good
2026-08-15T00:00:00.000Z	23 \| good	4.416 \| good	5.349 \| good	25.135 \| good	0.162 \| good	4.051 \| good	0.12 \| good
2026-08-15T01:00:00.000Z	23 \| good	4.241 \| good	5.078 \| good	24.606 \| good	0.147 \| good	3.514 \| good	0.116 \| good
2026-08-15T02:00:00.000Z	23 \| good	3.901 \| good	4.873 \| good	24.96 \| good	0.11 \| good	2.751 \| good	0.114 \| good
2026-08-15T03:00:00.000Z	22 \| good	3.467 \| good	4.706 \| good	23.9 \| good	0.091 \| good	2.457 \| good	0.113 \| good
2026-08-15T04:00:00.000Z	21 \| good	3.172 \| good	4.958 \| good	23.073 \| good	0.11 \| good	2.423 \| good	0.112 \| good
2026-08-15T05:00:00.000Z	20 \| good	2.86 \| good	5.227 \| good	22.213 \| good	0.129 \| good	2.431 \| good	0.109 \| good
2026-08-15T06:00:00.000Z	19 \| good	3 \| good	5.343 \| good	21.456 \| good	0.136 \| good	2.375 \| good	0.109 \| good
2026-08-15T07:00:00.000Z	19 \| good	3.401 \| good	5.502 \| good	21.173 \| good	0.138 \| good	2.212 \| good	0.112 \| good
2026-08-15T08:00:00.000Z	22 \| good	3.631 \| good	5.4 \| good	21.334 \| good	0.153 \| good	2.126 \| good	0.113 \| good
2026-08-15T09:00:00.000Z	22 \| good	3.737 \| good	5.404 \| good	23.616 \| good	0.131 \| good	2.074 \| good	0.114 \| good
2026-08-15T10:00:00.000Z	23 \| good	4.19 \| good	5.823 \| good	25.229 \| good	0.114 \| good	1.997 \| good	0.114 \| good
2026-08-15T11:00:00.000Z	24 \| good	4.462 \| good	6.428 \| good	26.418 \| good	0.13 \| good	1.88 \| good	0.115 \| good
2026-08-15T12:00:00.000Z	27 \| good	4.576 \| good	7.228 \| good	28.848 \| good	0.176 \| good	1.735 \| good	0.114 \| good
2026-08-15T13:00:00.000Z	29 \| good	4.65 \| good	7.431 \| good	30.852 \| good	0.207 \| good	1.678 \| good	0.113 \| good
2026-08-15T14:00:00.000Z	31 \| good	4.687 \| good	7.109 \| good	34.378 \| good	0.227 \| good	1.462 \| good	0.114 \| good
2026-08-15T15:00:00.000Z	34 \| good	4.695 \| good	6.915 \| good	36.711 \| good	0.206 \| good	1.229 \| good	0.116 \| good
2026-08-15T16:00:00.000Z	36 \| good	4.626 \| good	6.756 \| good	38.698 \| good	0.208 \| good	1.163 \| good	0.117 \| good
2026-08-15T17:00:00.000Z	36 \| good	4.501 \| good	6.222 \| good	39.432 \| good	0.193 \| good	1.223 \| good	0.116 \| good
2026-08-15T18:00:00.000Z	35 \| good	4.197 \| good	6.164 \| good	37.875 \| good	0.166 \| good	1.313 \| good	0.116 \| good
2026-08-15T19:00:00.000Z	32 \| good	4.209 \| good	6.157 \| good	35.443 \| good	0.195 \| good	1.765 \| good	0.116 \| good
2026-08-15T20:00:00.000Z	30 \| good	4.277 \| good	6.634 \| good	32.465 \| good	0.243 \| good	2.894 \| good	0.117 \| good
2026-08-15T21:00:00.000Z	25 \| good	4.341 \| good	6.749 \| good	27.444 \| good	0.275 \| good	3.776 \| good	0.119 \| good
2026-08-15T22:00:00.000Z	27 \| good	4.515 \| good	7.032 \| good	23.716 \| good	0.255 \| good	4.147 \| good	0.122 \| good
2026-08-15T23:00:00.000Z	27 \| good	4.601 \| good	7.329 \| good	21.301 \| good	0.244 \| good	4.911 \| good	0.123 \| good
2026-08-16T00:00:00.000Z	27 \| good	4.934 \| good	7.688 \| good	19.698 \| good	0.228 \| good	6.009 \| good	0.124 \| good
2026-08-16T01:00:00.000Z	27 \| good	5.146 \| good	8.397 \| good	18.149 \| good	0.24 \| good	6.017 \| good	0.124 \| good
2026-08-16T02:00:00.000Z	27 \| good	5.218 \| good	8.568 \| good	16.408 \| good	0.251 \| good	5.683 \| good	0.123 \| good
2026-08-16T03:00:00.000Z	27 \| good	5.004 \| good	8.564 \| good	15.871 \| good	0.259 \| good	5.175 \| good	0.123 \| good
2026-08-16T04:00:00.000Z	27 \| good	4.982 \| good	9.141 \| good	15.179 \| good	0.249 \| good	4.593 \| good	0.121 \| good
2026-08-16T05:00:00.000Z	27 \| good	5.22 \| good	9.71 \| good	16.246 \| good	0.23 \| good	4.169 \| good	0.12 \| good
2026-08-16T06:00:00.000Z	33 \| good	5.781 \| good	9.941 \| good	17.448 \| good	0.245 \| good	3.932 \| good	0.12 \| good
2026-08-16T07:00:00.000Z	33 \| good	6.175 \| good	9.477 \| good	18.975 \| good	0.284 \| good	3.649 \| good	0.122 \| good
2026-08-16T08:00:00.000Z	33 \| good	5.754 \| good	9.156 \| good	22.435 \| good	0.295 \| good	2.981 \| good	0.121 \| good
2026-08-16T09:00:00.000Z	27 \| good	5.454 \| good	8.719 \| good	24.841 \| good	0.256 \| good	2.35 \| good	0.121 \| good
2026-08-16T10:00:00.000Z	28 \| good	4.998 \| good	8.354 \| good	30.215 \| good	0.211 \| good	1.986 \| good	0.12 \| good
2026-08-16T11:00:00.000Z	33 \| good	4.797 \| good	7.512 \| good	35.925 \| good	0.17 \| good	1.592 \| good	0.119 \| good
2026-08-16T12:00:00.000Z	38 \| good	4.475 \| good	7.073 \| good	40.503 \| good	0.167 \| good	1.228 \| good	0.117 \| good
2026-08-16T13:00:00.000Z	40 \| good	4.121 \| good	6.797 \| good	42.578 \| good	0.137 \| good	1.122 \| good	0.116 \| good
2026-08-16T14:00:00.000Z	40 \| good	4.289 \| good	6.757 \| good	43.245 \| good	0.135 \| good	1.1 \| good	0.115 \| good
2026-08-16T15:00:00.000Z	39 \| good	4.464 \| good	7.08 \| good	42.205 \| good	0.134 \| good	1.195 \| good	0.116 \| good
2026-08-16T16:00:00.000Z	39 \| good	4.69 \| good	7.706 \| good	42.18 \| good	0.138 \| good	1.32 \| good	0.118 \| good
2026-08-16T17:00:00.000Z	39 \| good	4.761 \| good	8.18 \| good	42.123 \| good	0.152 \| good	1.517 \| good	0.12 \| 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
Borehamwood, Hertfordshire	52 Moderate	9.82μg/m³ Good	22.90μg/m³ Good	47.76ppb Good	0.64ppb Good	6.38ppb Good	0.00ppm Good
Hemel Hempstead, Hertfordshire	49 Good	8.75μg/m³ Good	33.97μg/m³ Good	41.16ppb Good	0.65ppb Good	9.99ppb Good	0.01ppm Good
Hertford, Hertfordshire	52 Moderate	9.51μg/m³ Good	28.23μg/m³ Good	46.02ppb Good	0.65ppb Good	10.26ppb Good	0.01ppm Good
Bishop's Stortford, Hertfordshire	52 Moderate	9.70μg/m³ Good	25.91μg/m³ Good	47.84ppb Good	0.57ppb Good	8.46ppb Good	0.02ppm Good
Bushey, Hertfordshire	58 Moderate	13.12μg/m³ Fine	36.09μg/m³ Good	52.70ppb Good	0.64ppb Good	17.02ppb Good	0.00ppm Good
Rickmansworth, Hertfordshire	44 Good	8.20μg/m³ Good	29.66μg/m³ Good	40.20ppb Good	0.65ppb Good	11.30ppb Good	0.01ppm Good
Hatfield, Hertfordshire	49 Good	9.26μg/m³ Good	27.13μg/m³ Good	43.36ppb Good	0.65ppb Good	11.01ppb Good	0.01ppm Good
Baldock, Hertfordshire	49 Good	9.05μg/m³ Good	32.77μg/m³ Good	37.83ppb Good	0.65ppb Good	14.81ppb Good	0.01ppm Good
Chorleywood, Hertfordshire	44 Good	8.20μg/m³ Good	29.66μg/m³ Good	40.20ppb Good	0.65ppb Good	11.30ppb Good	0.01ppm Good
Abbots Langley, Hertfordshire	49 Good	8.75μg/m³ Good	33.97μg/m³ Good	41.16ppb Good	0.65ppb Good	9.99ppb Good	0.01ppm Good
Berkhamsted, Hertfordshire	49 Good	8.81μg/m³ Good	34.37μg/m³ Good	39.48ppb Good	0.65ppb Good	8.55ppb Good	0.01ppm Good
Harpenden, Hertfordshire	44 Good	8.31μg/m³ Good	33.64μg/m³ Good	39.35ppb Good	0.65ppb Good	13.63ppb Good	0.01ppm Good
Cheshunt, Hertfordshire	49 Good	9.49μg/m³ Good	27.06μg/m³ Good	47.36ppb Good	0.65ppb Good	25.80ppb Good	0.01ppm Good
Hitchin, Hertfordshire	49 Good	9.05μg/m³ Good	32.77μg/m³ Good	37.83ppb Good	0.65ppb Good	14.81ppb Good	0.01ppm Good
Letchworth, Hertfordshire	49 Good	9.05μg/m³ Good	32.77μg/m³ Good	37.83ppb Good	0.65ppb Good	14.81ppb Good	0.01ppm Good
St Albans, Hertfordshire	54 Moderate	11.04μg/m³ Good	28.71μg/m³ Good	47.91ppb Good	0.64ppb Good	14.54ppb Good	0.00ppm Good
Potters Bar, Hertfordshire	52 Moderate	9.51μg/m³ Good	24.05μg/m³ Good	47.37ppb Good	0.65ppb Good	15.91ppb Good	0.01ppm Good
Sawbridgeworth, Hertfordshire	52 Moderate	9.70μg/m³ Good	25.91μg/m³ Good	47.84ppb Good	0.57ppb Good	8.46ppb Good	0.02ppm Good
Hoddesdon, Hertfordshire	52 Moderate	9.51μg/m³ Good	28.23μg/m³ Good	46.02ppb Good	0.65ppb Good	10.26ppb Good	0.01ppm Good
Royston, Hertfordshire	52 Moderate	10.06μg/m³ Good	27.32μg/m³ Good	40.66ppb Good	0.56ppb Good	8.53ppb Good	0.02ppm Good
Stevenage, Hertfordshire	49 Good	9.05μg/m³ Good	32.77μg/m³ Good	37.83ppb Good	0.65ppb Good	14.81ppb Good	0.01ppm Good
Waltham Cross, Hertfordshire	52 Moderate	9.52μg/m³ Good	27.11μg/m³ Good	47.35ppb Good	0.65ppb Good	25.80ppb Good	0.01ppm Good
Ware, Hertfordshire	52 Moderate	9.61μg/m³ Good	27.46μg/m³ Good	45.96ppb Good	0.65ppb Good	10.05ppb Good	0.01ppm Good
Watford, Hertfordshire	44 Good	8.43μg/m³ Good	27.50μg/m³ Good	40.42ppb Good	0.65ppb Good	9.38ppb Good	0.01ppm Good
Tring, Hertfordshire	44 Good	8.45μg/m³ Good	33.80μg/m³ Good	32.16ppb Good	0.65ppb Good	7.33ppb Good	0.01ppm Good
Welwyn Garden City, Hertfordshire	49 Good	8.58μg/m³ Good	32.82μg/m³ Good	40.77ppb Good	0.65ppb Good	11.07ppb Good	0.01ppm Good

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

0.02ppm

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 05:00:00 on 2026-08-13.

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 12:00:00 on 2026-08-14.

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 8.619 μg/m³.

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

The current PM₁₀ concentration at Hertfordshire, UK is 28.393 μg/m³.

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

The current carbon monoxide (CO) concentration at Hertfordshire, UK is 0.01 ppm.

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

The current sulfur dioxide (SO₂) concentration at Hertfordshire, UK is 0.743 ppb.

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

The current ozone (O₃) concentration at Hertfordshire, UK is 37.785 ppm.

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

The current nitrogen dioxide (NO₂) concentration at Hertfordshire, UK is 12.204 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-08-12T18:00:00.000Z	67 \| moderate	6.929 \| good	28.7 \| good	60.131 \| fine	1.037 \| good	5.907 \| good	0.01 \| good
2026-08-12T19:00:00.000Z	50 \| good	5.957 \| good	28.7 \| good	54.369 \| good	0.984 \| good	7.024 \| good	0.011 \| good
2026-08-12T20:00:00.000Z	71 \| moderate	8.429 \| good	20.631 \| good	60.707 \| fine	0.733 \| good	8.343 \| good	0.011 \| good
2026-08-12T21:00:00.000Z	64 \| moderate	6.344 \| good	19.676 \| good	58.998 \| fine	1.065 \| good	6.463 \| good	0.008 \| good
2026-08-12T22:00:00.000Z	67 \| moderate	6.352 \| good	20.11 \| good	59.515 \| fine	1.13 \| good	7.475 \| good	0.009 \| good
2026-08-12T23:00:00.000Z	54 \| moderate	7.204 \| good	21.234 \| good	55.622 \| fine	1.058 \| good	6.019 \| good	0.009 \| good
2026-08-13T00:00:00.000Z	50 \| good	5.348 \| good	19.231 \| good	53.746 \| good	1.192 \| good	6.715 \| good	0.165 \| good
2026-08-13T01:00:00.000Z	58 \| moderate	8.28 \| good	31.233 \| good	56.691 \| fine	0.852 \| good	8.188 \| good	0.153 \| good
2026-08-13T02:00:00.000Z	46 \| good	8.48 \| good	25.421 \| good	49.765 \| good	0.763 \| good	9.781 \| good	0.158 \| good
2026-08-13T03:00:00.000Z	50 \| good	6.691 \| good	29.088 \| good	53.81 \| good	0.693 \| good	9.131 \| good	0.158 \| good
2026-08-13T04:00:00.000Z	44 \| good	6.871 \| good	28.794 \| good	47.38 \| good	0.831 \| good	8.622 \| good	0.165 \| good
2026-08-13T05:00:00.000Z	45 \| good	7.509 \| good	23.33 \| good	48.632 \| good	0.592 \| good	11.412 \| good	0.009 \| good
2026-08-13T06:00:00.000Z	49 \| good	9.173 \| good	29.834 \| good	36.683 \| good	0.775 \| good	9.014 \| good	0.009 \| good
2026-08-13T07:00:00.000Z	44 \| good	8.12 \| good	20.645 \| good	30.392 \| good	0.68 \| good	10.101 \| good	0.009 \| good
2026-08-13T08:00:00.000Z	54 \| moderate	10.787 \| good	24.773 \| good	39.33 \| good	0.69 \| good	13.027 \| good	0.009 \| good
2026-08-13T09:00:00.000Z	49 \| good	8.643 \| good	16.915 \| good	39.772 \| good	0.815 \| good	11.037 \| good	0.01 \| good
2026-08-13T10:00:00.000Z	47 \| good	7.268 \| good	35.002 \| good	51.119 \| good	5.912 \| good	10.396 \| good	0.009 \| good
2026-08-13T11:00:00.000Z	38 \| good	6.786 \| good	17.051 \| good	37.697 \| good	1.011 \| good	10.294 \| good	0.009 \| good
2026-08-13T12:00:00.000Z	44 \| good	7.532 \| good	30.361 \| good	33.149 \| good	1.101 \| good	8.576 \| good	0.009 \| good
2026-08-13T13:00:00.000Z	56 \| moderate	11.581 \| good	36.904 \| good	34.892 \| good	0.821 \| good	10.19 \| good	0.01 \| good
2026-08-13T14:00:00.000Z	38 \| good	7.325 \| good	29.509 \| good	36.202 \| good	1.025 \| good	10.739 \| good	0.009 \| good
2026-08-13T15:00:00.000Z	44 \| good	8.497 \| good	32.04 \| good	45.189 \| good	0.738 \| good	9.872 \| good	0.01 \| good
2026-08-13T16:00:00.000Z	44 \| good	7.389 \| good	22.602 \| good	47.5 \| good	0.739 \| good	22.469 \| good	0.01 \| good
2026-08-13T17:00:00.000Z	97 \| moderate	6.195 \| good	27.2 \| good	68.669 \| fine	0.959 \| good	13.897 \| good	0.009 \| good
2026-08-13T18:00:00.000Z	87 \| moderate	7.067 \| good	28.225 \| good	66.387 \| fine	0.884 \| good	14.047 \| good	0.013 \| good
2026-08-13T19:00:00.000Z	45 \| good	6.23 \| good	36.2 \| good	48.88 \| good	0.733 \| good	15.881 \| good	0.012 \| good
2026-08-13T20:00:00.000Z	90 \| moderate	7.77 \| good	24.248 \| good	66.874 \| fine	0.74 \| good	17.071 \| good	0.012 \| good
2026-08-13T21:00:00.000Z	52 \| moderate	9.838 \| good	24.488 \| good	49.956 \| good	0.666 \| good	17.332 \| good	0.014 \| good
2026-08-13T22:00:00.000Z	74 \| moderate	9.441 \| good	18.908 \| good	61.578 \| fine	0.808 \| good	17.118 \| good	0.01 \| good
2026-08-13T23:00:00.000Z	67 \| moderate	7.767 \| good	21.453 \| good	60.156 \| fine	0.737 \| good	22.349 \| good	0.008 \| good
2026-08-14T00:00:00.000Z	80 \| moderate	7.096 \| good	31.319 \| good	63.958 \| fine	0.845 \| good	16.62 \| good	0.151 \| good
2026-08-14T01:00:00.000Z	58 \| moderate	9.585 \| good	26.468 \| good	56.636 \| fine	0.677 \| good	11.54 \| good	0.139 \| good
2026-08-14T02:00:00.000Z	58 \| moderate	10 \| good	27.639 \| good	56.88 \| fine	0.848 \| good	6.629 \| good	0.142 \| good
2026-08-14T03:00:00.000Z	50 \| good	8.158 \| good	23.86 \| good	53.688 \| good	0.895 \| good	7.517 \| good	0.148 \| good
2026-08-14T04:00:00.000Z	52 \| moderate	10.487 \| good	28.98 \| good	48.117 \| good	0.891 \| good	7.273 \| good	0.148 \| good
2026-08-14T05:00:00.000Z	52 \| moderate	9.96 \| good	22.506 \| good	50.731 \| good	0.748 \| good	8.974 \| good	0.009 \| good
2026-08-14T06:00:00.000Z	49 \| good	7.386 \| good	23.974 \| good	52.52 \| good	0.676 \| good	18.967 \| good	0.009 \| good
2026-08-14T07:00:00.000Z	44 \| good	7.571 \| good	28.549 \| good	46.758 \| good	0.75 \| good	19.214 \| good	0.009 \| good
2026-08-14T08:00:00.000Z	45 \| good	7.715 \| good	25.488 \| good	49.434 \| good	0.704 \| good	14.785 \| good	0.009 \| good
2026-08-14T09:00:00.000Z	44 \| good	7.532 \| good	24.974 \| good	40.764 \| good	0.648 \| good	15.228 \| good	0.009 \| good
2026-08-14T10:00:00.000Z	38 \| good	7.182 \| good	21.456 \| good	34.117 \| good	0.755 \| good	12.444 \| good	0.009 \| good
2026-08-14T11:00:00.000Z	38 \| good	7.311 \| good	22.027 \| good	33.182 \| good	0.669 \| good	10.538 \| good	0.01 \| good
2026-08-14T12:00:00.000Z	38 \| good	7.448 \| good	28.786 \| good	29.33 \| good	0.755 \| good	11.484 \| good	0.01 \| good
2026-08-14T13:00:00.000Z	49 \| good	8.917 \| good	32.404 \| good	37.713 \| good	0.612 \| good	9.88 \| good	0.01 \| good
2026-08-14T14:00:00.000Z	44 \| good	8.294 \| good	27.893 \| good	39.518 \| good	0.648 \| good	9.578 \| good	0.011 \| good
2026-08-14T15:00:00.000Z	44 \| good	8.072 \| good	26.245 \| good	35.995 \| good	0.648 \| good	9.86 \| good	0.01 \| good
2026-08-14T16:00:00.000Z	49 \| good	8.579 \| good	32.822 \| good	40.774 \| good	0.648 \| good	11.068 \| good	0.01 \| good
2026-08-14T17:00:00.000Z	49 \| good	8.988 \| good	23.333 \| good	40.369 \| good	0.648 \| good	14.162 \| good	0.01 \| good
2026-08-14T17:00:00.000Z	49 \| good	9.328 \| good	29.869 \| good	42.859 \| good	0.638 \| good	12.472 \| good	0.01 \| good
2026-08-14T18:00:00.000Z	34 \| good	3.668 \| good	6.613 \| good	37.275 \| good	0.111 \| good	2.23 \| good	0.109 \| good
2026-08-14T19:00:00.000Z	33 \| good	3.599 \| good	6.973 \| good	36.006 \| good	0.133 \| good	3.114 \| good	0.11 \| good
2026-08-14T20:00:00.000Z	29 \| good	3.894 \| good	7.171 \| good	31.212 \| good	0.181 \| good	4.837 \| good	0.115 \| good
2026-08-14T21:00:00.000Z	27 \| good	4.334 \| good	8.355 \| good	28.716 \| good	0.226 \| good	7.069 \| good	0.123 \| good
2026-08-14T22:00:00.000Z	27 \| good	4.746 \| good	7.119 \| good	26.452 \| good	0.21 \| good	5.423 \| good	0.124 \| good
2026-08-14T23:00:00.000Z	27 \| good	4.586 \| good	6.191 \| good	26.787 \| good	0.187 \| good	4.805 \| good	0.118 \| good
2026-08-15T00:00:00.000Z	23 \| good	4.416 \| good	5.349 \| good	25.135 \| good	0.162 \| good	4.051 \| good	0.12 \| good
2026-08-15T01:00:00.000Z	23 \| good	4.241 \| good	5.078 \| good	24.606 \| good	0.147 \| good	3.514 \| good	0.116 \| good
2026-08-15T02:00:00.000Z	23 \| good	3.901 \| good	4.873 \| good	24.96 \| good	0.11 \| good	2.751 \| good	0.114 \| good
2026-08-15T03:00:00.000Z	22 \| good	3.467 \| good	4.706 \| good	23.9 \| good	0.091 \| good	2.457 \| good	0.113 \| good
2026-08-15T04:00:00.000Z	21 \| good	3.172 \| good	4.958 \| good	23.073 \| good	0.11 \| good	2.423 \| good	0.112 \| good
2026-08-15T05:00:00.000Z	20 \| good	2.86 \| good	5.227 \| good	22.213 \| good	0.129 \| good	2.431 \| good	0.109 \| good
2026-08-15T06:00:00.000Z	19 \| good	3 \| good	5.343 \| good	21.456 \| good	0.136 \| good	2.375 \| good	0.109 \| good
2026-08-15T07:00:00.000Z	19 \| good	3.401 \| good	5.502 \| good	21.173 \| good	0.138 \| good	2.212 \| good	0.112 \| good
2026-08-15T08:00:00.000Z	22 \| good	3.631 \| good	5.4 \| good	21.334 \| good	0.153 \| good	2.126 \| good	0.113 \| good
2026-08-15T09:00:00.000Z	22 \| good	3.737 \| good	5.404 \| good	23.616 \| good	0.131 \| good	2.074 \| good	0.114 \| good
2026-08-15T10:00:00.000Z	23 \| good	4.19 \| good	5.823 \| good	25.229 \| good	0.114 \| good	1.997 \| good	0.114 \| good
2026-08-15T11:00:00.000Z	24 \| good	4.462 \| good	6.428 \| good	26.418 \| good	0.13 \| good	1.88 \| good	0.115 \| good
2026-08-15T12:00:00.000Z	27 \| good	4.576 \| good	7.228 \| good	28.848 \| good	0.176 \| good	1.735 \| good	0.114 \| good
2026-08-15T13:00:00.000Z	29 \| good	4.65 \| good	7.431 \| good	30.852 \| good	0.207 \| good	1.678 \| good	0.113 \| good
2026-08-15T14:00:00.000Z	31 \| good	4.687 \| good	7.109 \| good	34.378 \| good	0.227 \| good	1.462 \| good	0.114 \| good
2026-08-15T15:00:00.000Z	34 \| good	4.695 \| good	6.915 \| good	36.711 \| good	0.206 \| good	1.229 \| good	0.116 \| good
2026-08-15T16:00:00.000Z	36 \| good	4.626 \| good	6.756 \| good	38.698 \| good	0.208 \| good	1.163 \| good	0.117 \| good
2026-08-15T17:00:00.000Z	36 \| good	4.501 \| good	6.222 \| good	39.432 \| good	0.193 \| good	1.223 \| good	0.116 \| good
2026-08-15T18:00:00.000Z	35 \| good	4.197 \| good	6.164 \| good	37.875 \| good	0.166 \| good	1.313 \| good	0.116 \| good
2026-08-15T19:00:00.000Z	32 \| good	4.209 \| good	6.157 \| good	35.443 \| good	0.195 \| good	1.765 \| good	0.116 \| good
2026-08-15T20:00:00.000Z	30 \| good	4.277 \| good	6.634 \| good	32.465 \| good	0.243 \| good	2.894 \| good	0.117 \| good
2026-08-15T21:00:00.000Z	25 \| good	4.341 \| good	6.749 \| good	27.444 \| good	0.275 \| good	3.776 \| good	0.119 \| good
2026-08-15T22:00:00.000Z	27 \| good	4.515 \| good	7.032 \| good	23.716 \| good	0.255 \| good	4.147 \| good	0.122 \| good
2026-08-15T23:00:00.000Z	27 \| good	4.601 \| good	7.329 \| good	21.301 \| good	0.244 \| good	4.911 \| good	0.123 \| good
2026-08-16T00:00:00.000Z	27 \| good	4.934 \| good	7.688 \| good	19.698 \| good	0.228 \| good	6.009 \| good	0.124 \| good
2026-08-16T01:00:00.000Z	27 \| good	5.146 \| good	8.397 \| good	18.149 \| good	0.24 \| good	6.017 \| good	0.124 \| good
2026-08-16T02:00:00.000Z	27 \| good	5.218 \| good	8.568 \| good	16.408 \| good	0.251 \| good	5.683 \| good	0.123 \| good
2026-08-16T03:00:00.000Z	27 \| good	5.004 \| good	8.564 \| good	15.871 \| good	0.259 \| good	5.175 \| good	0.123 \| good
2026-08-16T04:00:00.000Z	27 \| good	4.982 \| good	9.141 \| good	15.179 \| good	0.249 \| good	4.593 \| good	0.121 \| good
2026-08-16T05:00:00.000Z	27 \| good	5.22 \| good	9.71 \| good	16.246 \| good	0.23 \| good	4.169 \| good	0.12 \| good
2026-08-16T06:00:00.000Z	33 \| good	5.781 \| good	9.941 \| good	17.448 \| good	0.245 \| good	3.932 \| good	0.12 \| good
2026-08-16T07:00:00.000Z	33 \| good	6.175 \| good	9.477 \| good	18.975 \| good	0.284 \| good	3.649 \| good	0.122 \| good
2026-08-16T08:00:00.000Z	33 \| good	5.754 \| good	9.156 \| good	22.435 \| good	0.295 \| good	2.981 \| good	0.121 \| good
2026-08-16T09:00:00.000Z	27 \| good	5.454 \| good	8.719 \| good	24.841 \| good	0.256 \| good	2.35 \| good	0.121 \| good
2026-08-16T10:00:00.000Z	28 \| good	4.998 \| good	8.354 \| good	30.215 \| good	0.211 \| good	1.986 \| good	0.12 \| good
2026-08-16T11:00:00.000Z	33 \| good	4.797 \| good	7.512 \| good	35.925 \| good	0.17 \| good	1.592 \| good	0.119 \| good
2026-08-16T12:00:00.000Z	38 \| good	4.475 \| good	7.073 \| good	40.503 \| good	0.167 \| good	1.228 \| good	0.117 \| good
2026-08-16T13:00:00.000Z	40 \| good	4.121 \| good	6.797 \| good	42.578 \| good	0.137 \| good	1.122 \| good	0.116 \| good
2026-08-16T14:00:00.000Z	40 \| good	4.289 \| good	6.757 \| good	43.245 \| good	0.135 \| good	1.1 \| good	0.115 \| good
2026-08-16T15:00:00.000Z	39 \| good	4.464 \| good	7.08 \| good	42.205 \| good	0.134 \| good	1.195 \| good	0.116 \| good
2026-08-16T16:00:00.000Z	39 \| good	4.69 \| good	7.706 \| good	42.18 \| good	0.138 \| good	1.32 \| good	0.118 \| good
2026-08-16T17:00:00.000Z	39 \| good	4.761 \| good	8.18 \| good	42.123 \| good	0.152 \| good	1.517 \| good	0.12 \| 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?