What is the sulfur dioxide (SO2) level in Harpenden, Hertfordshire at the moment?

Currently, Harpenden, Hertfordshire has a sulfur dioxide (SO2) concentration of 0.361 ppb.

What is the ozone (O3) level in Harpenden, Hertfordshire at the moment?

The current ozone (O3) level in Harpenden, Hertfordshire at the moment is 24.806 ppm.

What is the nitrogen dioxide (NO2) level in Harpenden, Hertfordshire at the moment?

Nitrogen dioxide (NO2) level in Harpenden, Hertfordshire at the moment is 2.967 ppb.

Live air quality index in Harpenden, Hertfordshire today

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

Stay updated with real-time air quality in Harpenden, Hertfordshire 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

Harpenden, Hertfordshire

Last updated: ... (Local time)

Major air pollutants in Harpenden, Hertfordshire

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

3.31 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

7.27 μg/m³

155

255

425

605+

Ozone (O₃)

25.39 ppb

201

201+

Sulfur Dioxide (SO₂)

0.38 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

1.58 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.20 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

Harpenden, Hertfordshire

Get Live Pollen Counts

Harpenden, Hertfordshire

Scroll To Air Quality Map

Track live Harpenden, Hertfordshire air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-16T04:00:00.000Z	33 \| good	6.05 \| good	19.381 \| good	24.182 \| good	0.426 \| good	2.07 \| good	0.364 \| good
2025-09-16T05:00:00.000Z	33 \| good	6.095 \| good	18.847 \| good	24.143 \| good	0.354 \| good	2.161 \| good	0.321 \| good
2025-09-16T06:00:00.000Z	33 \| good	5.99 \| good	18.761 \| good	24.698 \| good	0.354 \| good	2.864 \| good	0.02 \| good
2025-09-16T07:00:00.000Z	33 \| good	5.658 \| good	22.049 \| good	24.549 \| good	0.355 \| good	4.648 \| good	0.021 \| good
2025-09-16T08:00:00.000Z	33 \| good	5.994 \| good	16.991 \| good	23.961 \| good	0.355 \| good	5.63 \| good	0.019 \| good
2025-09-16T09:00:00.000Z	23 \| good	4.495 \| good	20.04 \| good	25.027 \| good	0.46 \| good	6.2 \| good	0.018 \| good
2025-09-16T10:00:00.000Z	27 \| good	4.776 \| good	18.936 \| good	23.261 \| good	0.44 \| good	5.718 \| good	0.018 \| good
2025-09-16T11:00:00.000Z	27 \| good	4.593 \| good	16.711 \| good	22.874 \| good	0.439 \| good	6.194 \| good	0.018 \| good
2025-09-16T12:00:00.000Z	27 \| good	4.54 \| good	12.893 \| good	24.035 \| good	0.473 \| good	4.058 \| good	0.016 \| good
2025-09-16T13:00:00.000Z	22 \| good	4.366 \| good	14.867 \| good	23.433 \| good	0.427 \| good	5.163 \| good	0.016 \| good
2025-09-16T14:00:00.000Z	24 \| good	4.292 \| good	17.39 \| good	25.713 \| good	0.473 \| good	5.039 \| good	0.016 \| good
2025-09-16T15:00:00.000Z	27 \| good	5.231 \| good	15.009 \| good	28.598 \| good	0.439 \| good	6.661 \| good	0.017 \| good
2025-09-16T16:00:00.000Z	22 \| good	4.079 \| good	13.866 \| good	24.245 \| good	0.51 \| good	7.127 \| good	0.016 \| good
2025-09-16T17:00:00.000Z	28 \| good	3.753 \| good	13.738 \| good	30.121 \| good	0.511 \| good	6.454 \| good	0.016 \| good
2025-09-16T18:00:00.000Z	29 \| good	4.269 \| good	11.556 \| good	30.886 \| good	0.39 \| good	6.267 \| good	0.017 \| good
2025-09-16T19:00:00.000Z	28 \| good	5.061 \| good	16.588 \| good	29.933 \| good	0.425 \| good	6.6 \| good	0.018 \| good
2025-09-16T20:00:00.000Z	27 \| good	5.001 \| good	14.15 \| good	27.931 \| good	0.356 \| good	3.644 \| good	0.018 \| good
2025-09-16T21:00:00.000Z	26 \| good	4 \| good	12.524 \| good	27.95 \| good	0.356 \| good	9.196 \| good	0.018 \| good
2025-09-16T22:00:00.000Z	23 \| good	4.235 \| good	12.633 \| good	24.867 \| good	0.354 \| good	6.518 \| good	0.015 \| good
2025-09-16T23:00:00.000Z	27 \| good	4.59 \| good	14.46 \| good	27.551 \| good	0.353 \| good	7.109 \| good	0.015 \| good
2025-09-17T00:00:00.000Z	23 \| good	4.361 \| good	16.385 \| good	25.122 \| good	0.432 \| good	4.812 \| good	0.29 \| good
2025-09-17T01:00:00.000Z	22 \| good	3.697 \| good	16.661 \| good	21.104 \| good	0.424 \| good	3.439 \| good	0.339 \| good
2025-09-17T02:00:00.000Z	27 \| good	4.977 \| good	9.919 \| good	20.847 \| good	0.424 \| good	3.928 \| good	0.312 \| good
2025-09-17T03:00:00.000Z	27 \| good	5.303 \| good	12.754 \| good	21.653 \| good	0.424 \| good	4.395 \| good	0.361 \| good
2025-09-17T04:00:00.000Z	27 \| good	4.797 \| good	10.891 \| good	19.028 \| good	0.433 \| good	3.545 \| good	0.37 \| good
2025-09-17T05:00:00.000Z	22 \| good	4.09 \| good	13.442 \| good	22.889 \| good	0.353 \| good	4.741 \| good	0.445 \| good
2025-09-17T06:00:00.000Z	22 \| good	3.936 \| good	9.664 \| good	19.23 \| good	0.354 \| good	6.928 \| good	0.015 \| good
2025-09-17T07:00:00.000Z	27 \| good	4.546 \| good	13.378 \| good	19.51 \| good	0.354 \| good	9.055 \| good	0.016 \| good
2025-09-17T08:00:00.000Z	22 \| good	4.113 \| good	13.72 \| good	20.368 \| good	0.354 \| good	6.032 \| good	0.015 \| good
2025-09-17T09:00:00.000Z	22 \| good	3.636 \| good	13.527 \| good	19.714 \| good	0.351 \| good	5.191 \| good	0.015 \| good
2025-09-17T10:00:00.000Z	22 \| good	3.761 \| good	13.128 \| good	23.138 \| good	0.361 \| good	6.201 \| good	0.014 \| good
2025-09-17T11:00:00.000Z	22 \| good	3.531 \| good	9.975 \| good	20.327 \| good	0.36 \| good	5.704 \| good	0.014 \| good
2025-09-17T12:00:00.000Z	20 \| good	3.15 \| good	13.382 \| good	21.684 \| good	0.361 \| good	4.758 \| good	0.014 \| good
2025-09-17T13:00:00.000Z	18 \| good	3.116 \| good	12.095 \| good	18.697 \| good	0.361 \| good	3.926 \| good	0.015 \| good
2025-09-17T14:00:00.000Z	22 \| good	3.914 \| good	9.467 \| good	20.837 \| good	0.47 \| good	5.374 \| good	0.014 \| good
2025-09-17T15:00:00.000Z	22 \| good	3.59 \| good	9.728 \| good	23.442 \| good	0.47 \| good	4.521 \| good	0.014 \| good
2025-09-17T16:00:00.000Z	20 \| good	3.071 \| good	8.962 \| good	21.755 \| good	0.469 \| good	5.296 \| good	0.014 \| good
2025-09-17T17:00:00.000Z	23 \| good	3.929 \| good	9.493 \| good	24.903 \| good	0.645 \| good	3.842 \| good	0.016 \| good
2025-09-17T18:00:00.000Z	22 \| good	3.829 \| good	9.605 \| good	23.515 \| good	0.47 \| good	5.362 \| good	0.015 \| good
2025-09-17T19:00:00.000Z	22 \| good	2.978 \| good	10.172 \| good	23.781 \| good	0.47 \| good	6.83 \| good	0.015 \| good
2025-09-17T20:00:00.000Z	20 \| good	3.037 \| good	10.328 \| good	21.653 \| good	0.361 \| good	7.521 \| good	0.016 \| good
2025-09-17T21:00:00.000Z	22 \| good	4.002 \| good	10.149 \| good	21.857 \| good	0.397 \| good	5.84 \| good	0.018 \| good
2025-09-17T22:00:00.000Z	22 \| good	3.731 \| good	9.847 \| good	21.959 \| good	0.361 \| good	3.834 \| good	0.011 \| good
2025-09-17T23:00:00.000Z	23 \| good	3.047 \| good	8.8 \| good	24.806 \| good	0.361 \| good	2.967 \| good	0.011 \| good
2025-09-18T00:00:00.000Z	22 \| good	3.294 \| good	9.332 \| good	24.317 \| good	0.382 \| good	2.772 \| good	0.208 \| good
2025-09-18T01:00:00.000Z	23 \| good	2.685 \| good	7.222 \| good	25.011 \| good	0.382 \| good	4.191 \| good	0.154 \| good
2025-09-18T02:00:00.000Z	23 \| good	3.311 \| good	7.272 \| good	25.386 \| good	0.382 \| good	1.579 \| good	0.195 \| good
2025-09-18T03:00:00.000Z	23 \| good	2.944 \| good	7.18 \| good	24.672 \| good	0.382 \| good	1.601 \| good	0.193 \| good
2025-09-18T03:00:00.000Z	23 \| good	3.311 \| good	7.272 \| good	25.386 \| good	0.382 \| good	1.579 \| good	0.195 \| good
2025-09-18T01:00:00.000Z	27 \| good	4.332 \| good	8.489 \| good	29.056 \| good	0.06 \| good	1.812 \| good	0.105 \| good
2025-09-18T02:00:00.000Z	27 \| good	4.167 \| good	8.013 \| good	28.614 \| good	0.054 \| good	1.609 \| good	0.103 \| good
2025-09-18T03:00:00.000Z	26 \| good	3.71 \| good	7.587 \| good	27.95 \| good	0.053 \| good	1.408 \| good	0.102 \| good
2025-09-18T04:00:00.000Z	25 \| good	3.921 \| good	7.269 \| good	26.844 \| good	0.054 \| good	1.318 \| good	0.102 \| good
2025-09-18T05:00:00.000Z	24 \| good	3.799 \| good	6.968 \| good	25.749 \| good	0.065 \| good	1.433 \| good	0.102 \| good
2025-09-18T06:00:00.000Z	23 \| good	3.797 \| good	6.861 \| good	25.028 \| good	0.106 \| good	2.57 \| good	0.104 \| good
2025-09-18T07:00:00.000Z	22 \| good	3.957 \| good	6.191 \| good	23.669 \| good	0.151 \| good	4.345 \| good	0.104 \| good
2025-09-18T08:00:00.000Z	22 \| good	4.054 \| good	6.544 \| good	22.458 \| good	0.164 \| good	5.6 \| good	0.105 \| good
2025-09-18T09:00:00.000Z	22 \| good	4.098 \| good	7.3 \| good	21.845 \| good	0.147 \| good	5.744 \| good	0.106 \| good
2025-09-18T10:00:00.000Z	22 \| good	4.094 \| good	7.194 \| good	21.477 \| good	0.149 \| good	4.779 \| good	0.106 \| good
2025-09-18T11:00:00.000Z	22 \| good	4.001 \| good	6.916 \| good	21.595 \| good	0.139 \| good	4.305 \| good	0.107 \| good
2025-09-18T12:00:00.000Z	22 \| good	3.933 \| good	6.645 \| good	22.514 \| good	0.149 \| good	3.871 \| good	0.107 \| good
2025-09-18T13:00:00.000Z	24 \| good	3.695 \| good	6.939 \| good	26.427 \| good	0.139 \| good	3.522 \| good	0.106 \| good
2025-09-18T14:00:00.000Z	28 \| good	3.22 \| good	6.311 \| good	29.577 \| good	0.133 \| good	2.96 \| good	0.105 \| good
2025-09-18T15:00:00.000Z	30 \| good	3.195 \| good	6.385 \| good	32.15 \| good	0.123 \| good	2.989 \| good	0.103 \| good
2025-09-18T16:00:00.000Z	30 \| good	3.192 \| good	6.84 \| good	31.602 \| good	0.132 \| good	3.651 \| good	0.103 \| good
2025-09-18T17:00:00.000Z	28 \| good	3.324 \| good	6.374 \| good	30.23 \| good	0.139 \| good	4.376 \| good	0.104 \| good
2025-09-18T18:00:00.000Z	27 \| good	3.985 \| good	6.338 \| good	29.085 \| good	0.172 \| good	5.428 \| good	0.106 \| good
2025-09-18T19:00:00.000Z	26 \| good	3.987 \| good	6.701 \| good	27.608 \| good	0.213 \| good	5.805 \| good	0.109 \| good
2025-09-18T20:00:00.000Z	25 \| good	3.836 \| good	6.955 \| good	26.788 \| good	0.222 \| good	5.42 \| good	0.109 \| good
2025-09-18T21:00:00.000Z	25 \| good	3.823 \| good	6.709 \| good	26.66 \| good	0.203 \| good	4.551 \| good	0.107 \| good
2025-09-18T22:00:00.000Z	25 \| good	3.719 \| good	6.414 \| good	26.641 \| good	0.166 \| good	4.018 \| good	0.106 \| good
2025-09-18T23:00:00.000Z	26 \| good	3.37 \| good	6.186 \| good	27.538 \| good	0.117 \| good	3.256 \| good	0.104 \| good
2025-09-19T00:00:00.000Z	26 \| good	3.155 \| good	5.87 \| good	27.886 \| good	0.091 \| good	2.31 \| good	0.102 \| good
2025-09-19T01:00:00.000Z	24 \| good	3.208 \| good	5.185 \| good	26.371 \| good	0.074 \| good	1.713 \| good	0.102 \| good
2025-09-19T02:00:00.000Z	25 \| good	3.497 \| good	5.798 \| good	26.968 \| good	0.07 \| good	1.434 \| good	0.102 \| good
2025-09-19T03:00:00.000Z	24 \| good	3.9 \| good	6.258 \| good	26.008 \| good	0.082 \| good	1.477 \| good	0.103 \| good
2025-09-19T04:00:00.000Z	27 \| good	4.909 \| good	7.748 \| good	25.774 \| good	0.107 \| good	1.829 \| good	0.105 \| good
2025-09-19T05:00:00.000Z	33 \| good	6.217 \| good	7.926 \| good	25.133 \| good	0.135 \| good	2.752 \| good	0.106 \| good
2025-09-19T06:00:00.000Z	44 \| good	7.869 \| good	8.835 \| good	22.932 \| good	0.206 \| good	5.478 \| good	0.112 \| good
2025-09-19T07:00:00.000Z	52 \| moderate	10.254 \| good	12.051 \| good	19.366 \| good	0.255 \| good	10.368 \| good	0.121 \| good
2025-09-19T08:00:00.000Z	54 \| moderate	10.764 \| good	13.174 \| good	20.889 \| good	0.302 \| good	10.979 \| good	0.127 \| good
2025-09-19T09:00:00.000Z	52 \| moderate	9.893 \| good	12.153 \| good	24.503 \| good	0.327 \| good	9.158 \| good	0.13 \| good
2025-09-19T10:00:00.000Z	49 \| good	8.861 \| good	13.013 \| good	30.116 \| good	0.336 \| good	5.977 \| good	0.13 \| good
2025-09-19T11:00:00.000Z	44 \| good	8.186 \| good	10.914 \| good	38.227 \| good	0.295 \| good	4.445 \| good	0.128 \| good
2025-09-19T12:00:00.000Z	39 \| good	7.318 \| good	10.138 \| good	41.733 \| good	0.28 \| good	3.525 \| good	0.127 \| good
2025-09-19T13:00:00.000Z	45 \| good	7.089 \| good	9.264 \| good	49.006 \| good	0.241 \| good	2.86 \| good	0.126 \| good
2025-09-19T14:00:00.000Z	48 \| good	6.705 \| good	8.93 \| good	51.826 \| good	0.22 \| good	2.478 \| good	0.124 \| good
2025-09-19T15:00:00.000Z	48 \| good	6.628 \| good	8.679 \| good	52.242 \| good	0.227 \| good	2.681 \| good	0.127 \| good
2025-09-19T16:00:00.000Z	46 \| good	6.928 \| good	9.889 \| good	49.649 \| good	0.269 \| good	3.569 \| good	0.128 \| good
2025-09-19T17:00:00.000Z	44 \| good	7.549 \| good	11.064 \| good	45.246 \| good	0.278 \| good	5.505 \| good	0.129 \| good
2025-09-19T18:00:00.000Z	44 \| good	8.279 \| good	12.318 \| good	41.339 \| good	0.374 \| good	7.941 \| good	0.133 \| good
2025-09-19T19:00:00.000Z	49 \| good	9.146 \| good	13.317 \| good	36.154 \| good	0.418 \| good	8.933 \| good	0.135 \| good
2025-09-19T20:00:00.000Z	52 \| moderate	9.717 \| good	14.597 \| good	32.272 \| good	0.404 \| good	9.289 \| good	0.135 \| good
2025-09-19T21:00:00.000Z	52 \| moderate	9.746 \| good	14.28 \| good	26.707 \| good	0.411 \| good	9.334 \| good	0.134 \| good
2025-09-19T22:00:00.000Z	52 \| moderate	9.755 \| good	14.883 \| good	22.615 \| good	0.401 \| good	9.172 \| good	0.131 \| good
2025-09-19T23:00:00.000Z	54 \| moderate	10.789 \| good	15.023 \| good	20.74 \| good	0.334 \| good	8.859 \| good	0.132 \| good
2025-09-20T00:00:00.000Z	54 \| moderate	10.906 \| good	14.734 \| good	20.515 \| good	0.255 \| good	7.591 \| good	0.127 \| good

Harpenden

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Harpenden, Hertfordshire air quality map: Stay updated on AQI near you

0.01ppm

How accurate is Hertfordshire, UK air quality data?

Air quality and pollutant data for Hertfordshire, UK are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.

Source: Ambee Data Sources

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Frequently asked questions

How often is air quality information updated for Harpenden, Hertfordshire?

The air quality information for Harpenden, Hertfordshire is updated every hour for accuracy.

What time in the last 24 hours was the air quality in Harpenden, Hertfordshire at its worst?

In the past 24 hours, the air quality in Harpenden, Hertfordshire was at its worst at 07:00:00 on 2025-09-17.

When did Harpenden, Hertfordshire experience the best air quality in the last 24 hours?

In the last 24 hours, the best air quality in Harpenden, Hertfordshire was observed at 01:00:00 on 2025-09-17.

What is the AQI in Harpenden, Hertfordshire right now?

As of now, the AQI in Harpenden, Hertfordshire is 23, indicating Good conditions.

What is the most common type of pollution in Harpenden, Hertfordshire?

Harpenden, Hertfordshire air has the highest levels of O3.

What should I do in case of poor air quality in Harpenden, Hertfordshire?

Poor air quality in Harpenden, Hertfordshire means it's advisable to stay indoors and wear a mask for your protection.

What is the PM_2.5 level in Harpenden, Hertfordshire at the moment?

PM_2.5 levels in Harpenden, Hertfordshire are currently 3.047 μg/m³.

What is the PM₁₀ level in Harpenden, Hertfordshire at the moment?

The PM₁₀ concentration in Harpenden, Hertfordshire is 8.8 μg/m³ at the moment.

What is the carbon monoxide (CO) level in Harpenden, Hertfordshire at the moment?

The current carbon monoxide (CO) concentration in Harpenden, Hertfordshire is 0.011 ppm.

What is the sulfur dioxide (SO₂) level in Harpenden, Hertfordshire at the moment?

Currently, Harpenden, Hertfordshire has a sulfur dioxide (SO₂) concentration of 0.361 ppb.

What is the ozone (O₃) level in Harpenden, Hertfordshire at the moment?

The current ozone (O₃) level in Harpenden, Hertfordshire at the moment is 24.806 ppm.

What is the nitrogen dioxide (NO₂) level in Harpenden, Hertfordshire at the moment?

Nitrogen dioxide (NO₂) level in Harpenden, Hertfordshire at the moment is 2.967 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-16T04:00:00.000Z	33 \| good	6.05 \| good	19.381 \| good	24.182 \| good	0.426 \| good	2.07 \| good	0.364 \| good
2025-09-16T05:00:00.000Z	33 \| good	6.095 \| good	18.847 \| good	24.143 \| good	0.354 \| good	2.161 \| good	0.321 \| good
2025-09-16T06:00:00.000Z	33 \| good	5.99 \| good	18.761 \| good	24.698 \| good	0.354 \| good	2.864 \| good	0.02 \| good
2025-09-16T07:00:00.000Z	33 \| good	5.658 \| good	22.049 \| good	24.549 \| good	0.355 \| good	4.648 \| good	0.021 \| good
2025-09-16T08:00:00.000Z	33 \| good	5.994 \| good	16.991 \| good	23.961 \| good	0.355 \| good	5.63 \| good	0.019 \| good
2025-09-16T09:00:00.000Z	23 \| good	4.495 \| good	20.04 \| good	25.027 \| good	0.46 \| good	6.2 \| good	0.018 \| good
2025-09-16T10:00:00.000Z	27 \| good	4.776 \| good	18.936 \| good	23.261 \| good	0.44 \| good	5.718 \| good	0.018 \| good
2025-09-16T11:00:00.000Z	27 \| good	4.593 \| good	16.711 \| good	22.874 \| good	0.439 \| good	6.194 \| good	0.018 \| good
2025-09-16T12:00:00.000Z	27 \| good	4.54 \| good	12.893 \| good	24.035 \| good	0.473 \| good	4.058 \| good	0.016 \| good
2025-09-16T13:00:00.000Z	22 \| good	4.366 \| good	14.867 \| good	23.433 \| good	0.427 \| good	5.163 \| good	0.016 \| good
2025-09-16T14:00:00.000Z	24 \| good	4.292 \| good	17.39 \| good	25.713 \| good	0.473 \| good	5.039 \| good	0.016 \| good
2025-09-16T15:00:00.000Z	27 \| good	5.231 \| good	15.009 \| good	28.598 \| good	0.439 \| good	6.661 \| good	0.017 \| good
2025-09-16T16:00:00.000Z	22 \| good	4.079 \| good	13.866 \| good	24.245 \| good	0.51 \| good	7.127 \| good	0.016 \| good
2025-09-16T17:00:00.000Z	28 \| good	3.753 \| good	13.738 \| good	30.121 \| good	0.511 \| good	6.454 \| good	0.016 \| good
2025-09-16T18:00:00.000Z	29 \| good	4.269 \| good	11.556 \| good	30.886 \| good	0.39 \| good	6.267 \| good	0.017 \| good
2025-09-16T19:00:00.000Z	28 \| good	5.061 \| good	16.588 \| good	29.933 \| good	0.425 \| good	6.6 \| good	0.018 \| good
2025-09-16T20:00:00.000Z	27 \| good	5.001 \| good	14.15 \| good	27.931 \| good	0.356 \| good	3.644 \| good	0.018 \| good
2025-09-16T21:00:00.000Z	26 \| good	4 \| good	12.524 \| good	27.95 \| good	0.356 \| good	9.196 \| good	0.018 \| good
2025-09-16T22:00:00.000Z	23 \| good	4.235 \| good	12.633 \| good	24.867 \| good	0.354 \| good	6.518 \| good	0.015 \| good
2025-09-16T23:00:00.000Z	27 \| good	4.59 \| good	14.46 \| good	27.551 \| good	0.353 \| good	7.109 \| good	0.015 \| good
2025-09-17T00:00:00.000Z	23 \| good	4.361 \| good	16.385 \| good	25.122 \| good	0.432 \| good	4.812 \| good	0.29 \| good
2025-09-17T01:00:00.000Z	22 \| good	3.697 \| good	16.661 \| good	21.104 \| good	0.424 \| good	3.439 \| good	0.339 \| good
2025-09-17T02:00:00.000Z	27 \| good	4.977 \| good	9.919 \| good	20.847 \| good	0.424 \| good	3.928 \| good	0.312 \| good
2025-09-17T03:00:00.000Z	27 \| good	5.303 \| good	12.754 \| good	21.653 \| good	0.424 \| good	4.395 \| good	0.361 \| good
2025-09-17T04:00:00.000Z	27 \| good	4.797 \| good	10.891 \| good	19.028 \| good	0.433 \| good	3.545 \| good	0.37 \| good
2025-09-17T05:00:00.000Z	22 \| good	4.09 \| good	13.442 \| good	22.889 \| good	0.353 \| good	4.741 \| good	0.445 \| good
2025-09-17T06:00:00.000Z	22 \| good	3.936 \| good	9.664 \| good	19.23 \| good	0.354 \| good	6.928 \| good	0.015 \| good
2025-09-17T07:00:00.000Z	27 \| good	4.546 \| good	13.378 \| good	19.51 \| good	0.354 \| good	9.055 \| good	0.016 \| good
2025-09-17T08:00:00.000Z	22 \| good	4.113 \| good	13.72 \| good	20.368 \| good	0.354 \| good	6.032 \| good	0.015 \| good
2025-09-17T09:00:00.000Z	22 \| good	3.636 \| good	13.527 \| good	19.714 \| good	0.351 \| good	5.191 \| good	0.015 \| good
2025-09-17T10:00:00.000Z	22 \| good	3.761 \| good	13.128 \| good	23.138 \| good	0.361 \| good	6.201 \| good	0.014 \| good
2025-09-17T11:00:00.000Z	22 \| good	3.531 \| good	9.975 \| good	20.327 \| good	0.36 \| good	5.704 \| good	0.014 \| good
2025-09-17T12:00:00.000Z	20 \| good	3.15 \| good	13.382 \| good	21.684 \| good	0.361 \| good	4.758 \| good	0.014 \| good
2025-09-17T13:00:00.000Z	18 \| good	3.116 \| good	12.095 \| good	18.697 \| good	0.361 \| good	3.926 \| good	0.015 \| good
2025-09-17T14:00:00.000Z	22 \| good	3.914 \| good	9.467 \| good	20.837 \| good	0.47 \| good	5.374 \| good	0.014 \| good
2025-09-17T15:00:00.000Z	22 \| good	3.59 \| good	9.728 \| good	23.442 \| good	0.47 \| good	4.521 \| good	0.014 \| good
2025-09-17T16:00:00.000Z	20 \| good	3.071 \| good	8.962 \| good	21.755 \| good	0.469 \| good	5.296 \| good	0.014 \| good
2025-09-17T17:00:00.000Z	23 \| good	3.929 \| good	9.493 \| good	24.903 \| good	0.645 \| good	3.842 \| good	0.016 \| good
2025-09-17T18:00:00.000Z	22 \| good	3.829 \| good	9.605 \| good	23.515 \| good	0.47 \| good	5.362 \| good	0.015 \| good
2025-09-17T19:00:00.000Z	22 \| good	2.978 \| good	10.172 \| good	23.781 \| good	0.47 \| good	6.83 \| good	0.015 \| good
2025-09-17T20:00:00.000Z	20 \| good	3.037 \| good	10.328 \| good	21.653 \| good	0.361 \| good	7.521 \| good	0.016 \| good
2025-09-17T21:00:00.000Z	22 \| good	4.002 \| good	10.149 \| good	21.857 \| good	0.397 \| good	5.84 \| good	0.018 \| good
2025-09-17T22:00:00.000Z	22 \| good	3.731 \| good	9.847 \| good	21.959 \| good	0.361 \| good	3.834 \| good	0.011 \| good
2025-09-17T23:00:00.000Z	23 \| good	3.047 \| good	8.8 \| good	24.806 \| good	0.361 \| good	2.967 \| good	0.011 \| good
2025-09-18T00:00:00.000Z	22 \| good	3.294 \| good	9.332 \| good	24.317 \| good	0.382 \| good	2.772 \| good	0.208 \| good
2025-09-18T01:00:00.000Z	23 \| good	2.685 \| good	7.222 \| good	25.011 \| good	0.382 \| good	4.191 \| good	0.154 \| good
2025-09-18T02:00:00.000Z	23 \| good	3.311 \| good	7.272 \| good	25.386 \| good	0.382 \| good	1.579 \| good	0.195 \| good
2025-09-18T03:00:00.000Z	23 \| good	2.944 \| good	7.18 \| good	24.672 \| good	0.382 \| good	1.601 \| good	0.193 \| good
2025-09-18T03:00:00.000Z	23 \| good	3.311 \| good	7.272 \| good	25.386 \| good	0.382 \| good	1.579 \| good	0.195 \| good
2025-09-18T01:00:00.000Z	27 \| good	4.332 \| good	8.489 \| good	29.056 \| good	0.06 \| good	1.812 \| good	0.105 \| good
2025-09-18T02:00:00.000Z	27 \| good	4.167 \| good	8.013 \| good	28.614 \| good	0.054 \| good	1.609 \| good	0.103 \| good
2025-09-18T03:00:00.000Z	26 \| good	3.71 \| good	7.587 \| good	27.95 \| good	0.053 \| good	1.408 \| good	0.102 \| good
2025-09-18T04:00:00.000Z	25 \| good	3.921 \| good	7.269 \| good	26.844 \| good	0.054 \| good	1.318 \| good	0.102 \| good
2025-09-18T05:00:00.000Z	24 \| good	3.799 \| good	6.968 \| good	25.749 \| good	0.065 \| good	1.433 \| good	0.102 \| good
2025-09-18T06:00:00.000Z	23 \| good	3.797 \| good	6.861 \| good	25.028 \| good	0.106 \| good	2.57 \| good	0.104 \| good
2025-09-18T07:00:00.000Z	22 \| good	3.957 \| good	6.191 \| good	23.669 \| good	0.151 \| good	4.345 \| good	0.104 \| good
2025-09-18T08:00:00.000Z	22 \| good	4.054 \| good	6.544 \| good	22.458 \| good	0.164 \| good	5.6 \| good	0.105 \| good
2025-09-18T09:00:00.000Z	22 \| good	4.098 \| good	7.3 \| good	21.845 \| good	0.147 \| good	5.744 \| good	0.106 \| good
2025-09-18T10:00:00.000Z	22 \| good	4.094 \| good	7.194 \| good	21.477 \| good	0.149 \| good	4.779 \| good	0.106 \| good
2025-09-18T11:00:00.000Z	22 \| good	4.001 \| good	6.916 \| good	21.595 \| good	0.139 \| good	4.305 \| good	0.107 \| good
2025-09-18T12:00:00.000Z	22 \| good	3.933 \| good	6.645 \| good	22.514 \| good	0.149 \| good	3.871 \| good	0.107 \| good
2025-09-18T13:00:00.000Z	24 \| good	3.695 \| good	6.939 \| good	26.427 \| good	0.139 \| good	3.522 \| good	0.106 \| good
2025-09-18T14:00:00.000Z	28 \| good	3.22 \| good	6.311 \| good	29.577 \| good	0.133 \| good	2.96 \| good	0.105 \| good
2025-09-18T15:00:00.000Z	30 \| good	3.195 \| good	6.385 \| good	32.15 \| good	0.123 \| good	2.989 \| good	0.103 \| good
2025-09-18T16:00:00.000Z	30 \| good	3.192 \| good	6.84 \| good	31.602 \| good	0.132 \| good	3.651 \| good	0.103 \| good
2025-09-18T17:00:00.000Z	28 \| good	3.324 \| good	6.374 \| good	30.23 \| good	0.139 \| good	4.376 \| good	0.104 \| good
2025-09-18T18:00:00.000Z	27 \| good	3.985 \| good	6.338 \| good	29.085 \| good	0.172 \| good	5.428 \| good	0.106 \| good
2025-09-18T19:00:00.000Z	26 \| good	3.987 \| good	6.701 \| good	27.608 \| good	0.213 \| good	5.805 \| good	0.109 \| good
2025-09-18T20:00:00.000Z	25 \| good	3.836 \| good	6.955 \| good	26.788 \| good	0.222 \| good	5.42 \| good	0.109 \| good
2025-09-18T21:00:00.000Z	25 \| good	3.823 \| good	6.709 \| good	26.66 \| good	0.203 \| good	4.551 \| good	0.107 \| good
2025-09-18T22:00:00.000Z	25 \| good	3.719 \| good	6.414 \| good	26.641 \| good	0.166 \| good	4.018 \| good	0.106 \| good
2025-09-18T23:00:00.000Z	26 \| good	3.37 \| good	6.186 \| good	27.538 \| good	0.117 \| good	3.256 \| good	0.104 \| good
2025-09-19T00:00:00.000Z	26 \| good	3.155 \| good	5.87 \| good	27.886 \| good	0.091 \| good	2.31 \| good	0.102 \| good
2025-09-19T01:00:00.000Z	24 \| good	3.208 \| good	5.185 \| good	26.371 \| good	0.074 \| good	1.713 \| good	0.102 \| good
2025-09-19T02:00:00.000Z	25 \| good	3.497 \| good	5.798 \| good	26.968 \| good	0.07 \| good	1.434 \| good	0.102 \| good
2025-09-19T03:00:00.000Z	24 \| good	3.9 \| good	6.258 \| good	26.008 \| good	0.082 \| good	1.477 \| good	0.103 \| good
2025-09-19T04:00:00.000Z	27 \| good	4.909 \| good	7.748 \| good	25.774 \| good	0.107 \| good	1.829 \| good	0.105 \| good
2025-09-19T05:00:00.000Z	33 \| good	6.217 \| good	7.926 \| good	25.133 \| good	0.135 \| good	2.752 \| good	0.106 \| good
2025-09-19T06:00:00.000Z	44 \| good	7.869 \| good	8.835 \| good	22.932 \| good	0.206 \| good	5.478 \| good	0.112 \| good
2025-09-19T07:00:00.000Z	52 \| moderate	10.254 \| good	12.051 \| good	19.366 \| good	0.255 \| good	10.368 \| good	0.121 \| good
2025-09-19T08:00:00.000Z	54 \| moderate	10.764 \| good	13.174 \| good	20.889 \| good	0.302 \| good	10.979 \| good	0.127 \| good
2025-09-19T09:00:00.000Z	52 \| moderate	9.893 \| good	12.153 \| good	24.503 \| good	0.327 \| good	9.158 \| good	0.13 \| good
2025-09-19T10:00:00.000Z	49 \| good	8.861 \| good	13.013 \| good	30.116 \| good	0.336 \| good	5.977 \| good	0.13 \| good
2025-09-19T11:00:00.000Z	44 \| good	8.186 \| good	10.914 \| good	38.227 \| good	0.295 \| good	4.445 \| good	0.128 \| good
2025-09-19T12:00:00.000Z	39 \| good	7.318 \| good	10.138 \| good	41.733 \| good	0.28 \| good	3.525 \| good	0.127 \| good
2025-09-19T13:00:00.000Z	45 \| good	7.089 \| good	9.264 \| good	49.006 \| good	0.241 \| good	2.86 \| good	0.126 \| good
2025-09-19T14:00:00.000Z	48 \| good	6.705 \| good	8.93 \| good	51.826 \| good	0.22 \| good	2.478 \| good	0.124 \| good
2025-09-19T15:00:00.000Z	48 \| good	6.628 \| good	8.679 \| good	52.242 \| good	0.227 \| good	2.681 \| good	0.127 \| good
2025-09-19T16:00:00.000Z	46 \| good	6.928 \| good	9.889 \| good	49.649 \| good	0.269 \| good	3.569 \| good	0.128 \| good
2025-09-19T17:00:00.000Z	44 \| good	7.549 \| good	11.064 \| good	45.246 \| good	0.278 \| good	5.505 \| good	0.129 \| good
2025-09-19T18:00:00.000Z	44 \| good	8.279 \| good	12.318 \| good	41.339 \| good	0.374 \| good	7.941 \| good	0.133 \| good
2025-09-19T19:00:00.000Z	49 \| good	9.146 \| good	13.317 \| good	36.154 \| good	0.418 \| good	8.933 \| good	0.135 \| good
2025-09-19T20:00:00.000Z	52 \| moderate	9.717 \| good	14.597 \| good	32.272 \| good	0.404 \| good	9.289 \| good	0.135 \| good
2025-09-19T21:00:00.000Z	52 \| moderate	9.746 \| good	14.28 \| good	26.707 \| good	0.411 \| good	9.334 \| good	0.134 \| good
2025-09-19T22:00:00.000Z	52 \| moderate	9.755 \| good	14.883 \| good	22.615 \| good	0.401 \| good	9.172 \| good	0.131 \| good
2025-09-19T23:00:00.000Z	54 \| moderate	10.789 \| good	15.023 \| good	20.74 \| good	0.334 \| good	8.859 \| good	0.132 \| good
2025-09-20T00:00:00.000Z	54 \| moderate	10.906 \| good	14.734 \| good	20.515 \| good	0.255 \| good	7.591 \| good	0.127 \| good

Live air quality index in Harpenden, Hertfordshire today

Major air pollutants in Harpenden, Hertfordshire

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Harpenden, Hertfordshire air quality map: Stay updated on AQI near you

Air quality in nearby cities

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Air quality levels in UK

Frequently asked questions

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What is the sulfur dioxide (SO2) level in Harpenden, Hertfordshire at the moment?

What is the ozone (O3) level in Harpenden, Hertfordshire at the moment?

What is the nitrogen dioxide (NO2) level in Harpenden, Hertfordshire at the moment?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the PM_2.5 level in Harpenden, Hertfordshire at the moment?

What is the PM₁₀ level in Harpenden, Hertfordshire at the moment?

What is the sulfur dioxide (SO₂) level in Harpenden, Hertfordshire at the moment?

What is the ozone (O₃) level in Harpenden, Hertfordshire at the moment?

What is the nitrogen dioxide (NO₂) level in Harpenden, Hertfordshire at the moment?