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

Currently, Harpenden, Hertfordshire has a sulfur dioxide (SO2) concentration of 0.939 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 25.554 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 8.606 ppb.

Real-time 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)

6.18 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

36.29 μg/m³

155

255

425

605+

Ozone (O₃)

48.26 ppb

201

201+

Sulfur Dioxide (SO₂)

1.35 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

11.35 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.01 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

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
2025-06-17T23:00:00.000Z	32 \| good	5.242 \| good	16.358 \| good	35.3 \| good	0.992 \| good	5.087 \| good	0.25 \| good
2025-06-18T00:00:00.000Z	31 \| good	5.264 \| good	12.073 \| good	34.491 \| good	1.048 \| good	4.364 \| good	0.279 \| good
2025-06-18T01:00:00.000Z	31 \| good	5.114 \| good	15.139 \| good	33.194 \| good	0.958 \| good	4.238 \| good	0.216 \| good
2025-06-18T02:00:00.000Z	33 \| good	6.036 \| good	10.781 \| good	34.205 \| good	0.803 \| good	3.055 \| good	0.221 \| good
2025-06-18T03:00:00.000Z	31 \| good	5.3 \| good	17.416 \| good	33.161 \| good	1.113 \| good	4.647 \| good	0.226 \| good
2025-06-18T04:00:00.000Z	44 \| good	8.099 \| good	10.878 \| good	31.806 \| good	0.997 \| good	5.263 \| good	0.278 \| good
2025-06-18T05:00:00.000Z	38 \| good	6.825 \| good	15.535 \| good	27.664 \| good	0.908 \| good	5.961 \| good	0.249 \| good
2025-06-18T06:00:00.000Z	38 \| good	6.769 \| good	10.732 \| good	28.359 \| good	0.99 \| good	4.113 \| good	0.271 \| good
2025-06-18T07:00:00.000Z	33 \| good	6.262 \| good	16.482 \| good	27.663 \| good	0.992 \| good	8.61 \| good	0.268 \| good
2025-06-18T08:00:00.000Z	33 \| good	6.266 \| good	11.033 \| good	22.084 \| good	0.996 \| good	5.851 \| good	0.254 \| good
2025-06-18T09:00:00.000Z	27 \| good	5.222 \| good	12.294 \| good	23.229 \| good	0.994 \| good	5.408 \| good	0.245 \| good
2025-06-18T10:00:00.000Z	27 \| good	4.997 \| good	21.54 \| good	23.911 \| good	1.085 \| good	4.462 \| good	0.235 \| good
2025-06-18T11:00:00.000Z	33 \| good	6.361 \| good	15.163 \| good	23.053 \| good	1.277 \| good	4.272 \| good	0.246 \| good
2025-06-18T12:00:00.000Z	27 \| good	5.302 \| good	21.732 \| good	26.821 \| good	1.186 \| good	4.86 \| good	0.235 \| good
2025-06-18T13:00:00.000Z	27 \| good	5.248 \| good	15.99 \| good	28.158 \| good	1.185 \| good	4.915 \| good	0.239 \| good
2025-06-18T14:00:00.000Z	38 \| good	6.793 \| good	14.909 \| good	29.228 \| good	0.952 \| good	4.644 \| good	0.23 \| good
2025-06-18T15:00:00.000Z	34 \| good	5.48 \| good	14.541 \| good	37.471 \| good	1 \| good	4.344 \| good	0.243 \| good
2025-06-18T16:00:00.000Z	31 \| good	4.922 \| good	14.703 \| good	34.185 \| good	1.139 \| good	4.371 \| good	0.242 \| good
2025-06-18T17:00:00.000Z	38 \| good	7.26 \| good	11.165 \| good	40.318 \| good	1.141 \| good	5.147 \| good	0.235 \| good
2025-06-18T18:00:00.000Z	38 \| good	5.909 \| good	11.227 \| good	41.4 \| good	1.09 \| good	4.75 \| good	0.281 \| good
2025-06-18T19:00:00.000Z	44 \| good	4.668 \| good	10.961 \| good	47.73 \| good	0.87 \| good	4.931 \| good	0.378 \| good
2025-06-18T20:00:00.000Z	45 \| good	7.005 \| good	12.94 \| good	48.584 \| good	0.995 \| good	7.511 \| good	0.335 \| good
2025-06-18T21:00:00.000Z	41 \| good	5.75 \| good	17.591 \| good	44.383 \| good	0.976 \| good	6.98 \| good	0.35 \| good
2025-06-18T22:00:00.000Z	41 \| good	5.318 \| good	13.97 \| good	44.37 \| good	0.955 \| good	6.276 \| good	0.376 \| good
2025-06-18T23:00:00.000Z	41 \| good	7.11 \| good	12.97 \| good	43.942 \| good	0.922 \| good	6.342 \| good	0.369 \| good
2025-06-19T00:00:00.000Z	39 \| good	6.354 \| good	14.45 \| good	41.675 \| good	1.036 \| good	6.132 \| good	0.329 \| good
2025-06-19T01:00:00.000Z	38 \| good	7.11 \| good	10.906 \| good	40.96 \| good	1.016 \| good	5.777 \| good	0.295 \| good
2025-06-19T02:00:00.000Z	49 \| good	9.439 \| good	19.604 \| good	34.559 \| good	1.106 \| good	7.383 \| good	0.322 \| good
2025-06-19T03:00:00.000Z	44 \| good	8.164 \| good	19.962 \| good	35.179 \| good	1.122 \| good	9.246 \| good	0.348 \| good
2025-06-19T04:00:00.000Z	49 \| good	9.13 \| good	16.874 \| good	27.941 \| good	1.042 \| good	6.503 \| good	0.356 \| good
2025-06-19T05:00:00.000Z	52 \| moderate	9.506 \| good	15.869 \| good	31.221 \| good	1.07 \| good	9.801 \| good	0.021 \| good
2025-06-19T06:00:00.000Z	44 \| good	7.565 \| good	15 \| good	28.165 \| good	0.947 \| good	5.296 \| good	0.016 \| good
2025-06-19T07:00:00.000Z	38 \| good	6.947 \| good	18.367 \| good	25.554 \| good	0.939 \| good	8.606 \| good	0.016 \| good
2025-06-19T08:00:00.000Z	49 \| good	8.828 \| good	21.062 \| good	25.021 \| good	1.048 \| good	13.603 \| good	0.016 \| good
2025-06-19T09:00:00.000Z	54 \| moderate	10.958 \| good	15.697 \| good	36.517 \| good	1.204 \| good	5.397 \| good	0.015 \| good
2025-06-19T10:00:00.000Z	44 \| good	8.149 \| good	26.549 \| good	28.787 \| good	1.311 \| good	5.777 \| good	0.015 \| good
2025-06-19T11:00:00.000Z	49 \| good	9.344 \| good	17.392 \| good	28.881 \| good	2.043 \| good	9.414 \| good	0.015 \| good
2025-06-19T12:00:00.000Z	44 \| good	7.862 \| good	10.464 \| good	31.76 \| good	1.287 \| good	7.75 \| good	0.01 \| good
2025-06-19T13:00:00.000Z	49 \| good	8.992 \| good	21.911 \| good	32.809 \| good	1.147 \| good	10.971 \| good	0.014 \| good
2025-06-19T14:00:00.000Z	49 \| good	8.715 \| good	13.724 \| good	42.968 \| good	1.171 \| good	16.413 \| good	0.015 \| good
2025-06-19T15:00:00.000Z	49 \| good	8.666 \| good	14.795 \| good	48.399 \| good	1.109 \| good	19.135 \| good	0.016 \| good
2025-06-19T16:00:00.000Z	49 \| good	9.276 \| good	14.539 \| good	52.637 \| good	1.107 \| good	16.476 \| good	0.014 \| good
2025-06-19T17:00:00.000Z	52 \| moderate	10.011 \| good	19.046 \| good	53.837 \| good	1.17 \| good	12.637 \| good	0.015 \| good
2025-06-19T18:00:00.000Z	58 \| moderate	9.732 \| good	20.401 \| good	56.571 \| fine	1.177 \| good	15.029 \| good	0.016 \| good
2025-06-19T19:00:00.000Z	49 \| good	8.587 \| good	21.558 \| good	49.594 \| good	1.161 \| good	14.232 \| good	0.016 \| good
2025-06-19T20:00:00.000Z	48 \| good	8.477 \| good	18.323 \| good	52.347 \| good	1.235 \| good	12.436 \| good	0.017 \| good
2025-06-19T21:00:00.000Z	71 \| moderate	11.266 \| good	25.58 \| good	60.946 \| fine	1.459 \| good	14.387 \| good	0.018 \| good
2025-06-19T22:00:00.000Z	44 \| good	6.18 \| good	36.289 \| good	48.26 \| good	1.352 \| good	11.345 \| good	0.014 \| good
2025-06-19T22:00:00.000Z	44 \| good	6.18 \| good	36.289 \| good	48.26 \| good	1.352 \| good	11.345 \| good	0.014 \| good
2025-06-19T09:00:00.000Z	54 \| moderate	11.049 \| good	16.741 \| good	35.494 \| good	0.633 \| good	7.128 \| good	0.163 \| good
2025-06-19T10:00:00.000Z	52 \| moderate	10.066 \| good	14.756 \| good	46.27 \| good	0.487 \| good	4.998 \| good	0.161 \| good
2025-06-19T11:00:00.000Z	54 \| moderate	10.09 \| good	12.966 \| good	55.563 \| fine	0.406 \| good	3.375 \| good	0.157 \| good
2025-06-19T12:00:00.000Z	71 \| moderate	9.473 \| good	12.892 \| good	60.868 \| fine	0.363 \| good	2.903 \| good	0.153 \| good
2025-06-19T13:00:00.000Z	80 \| moderate	8.959 \| good	12.392 \| good	63.706 \| fine	0.344 \| good	2.471 \| good	0.152 \| good
2025-06-19T14:00:00.000Z	84 \| moderate	9.035 \| good	11.795 \| good	65.272 \| fine	0.322 \| good	2.385 \| good	0.151 \| good
2025-06-19T15:00:00.000Z	90 \| moderate	9.311 \| good	11.834 \| good	67.085 \| fine	0.31 \| good	2.627 \| good	0.149 \| good
2025-06-19T16:00:00.000Z	87 \| moderate	9.403 \| good	12.142 \| good	66.331 \| fine	0.323 \| good	3.106 \| good	0.149 \| good
2025-06-19T17:00:00.000Z	93 \| moderate	9.797 \| good	12.664 \| good	67.644 \| fine	0.329 \| good	3.556 \| good	0.155 \| good
2025-06-19T18:00:00.000Z	77 \| moderate	9.173 \| good	12.79 \| good	62.998 \| fine	0.377 \| good	3.982 \| good	0.161 \| good
2025-06-19T19:00:00.000Z	50 \| good	8.097 \| good	10.414 \| good	53.917 \| good	0.399 \| good	4.839 \| good	0.152 \| good
2025-06-19T20:00:00.000Z	44 \| good	8.037 \| good	9.779 \| good	46.575 \| good	0.41 \| good	5.653 \| good	0.149 \| good
2025-06-19T21:00:00.000Z	39 \| good	7.4 \| good	9.91 \| good	42.32 \| good	0.4 \| good	6.59 \| good	0.146 \| good
2025-06-19T22:00:00.000Z	38 \| good	7.183 \| good	11.391 \| good	38.801 \| good	0.36 \| good	6.727 \| good	0.145 \| good
2025-06-19T23:00:00.000Z	38 \| good	6.926 \| good	11.962 \| good	36.435 \| good	0.327 \| good	6.804 \| good	0.142 \| good
2025-06-20T00:00:00.000Z	38 \| good	6.846 \| good	11.048 \| good	34.751 \| good	0.282 \| good	6.533 \| good	0.14 \| good
2025-06-20T01:00:00.000Z	38 \| good	7.107 \| good	10.948 \| good	33.438 \| good	0.256 \| good	5.869 \| good	0.138 \| good
2025-06-20T02:00:00.000Z	38 \| good	7.434 \| good	11.198 \| good	31.333 \| good	0.236 \| good	5.075 \| good	0.135 \| good
2025-06-20T03:00:00.000Z	38 \| good	7.374 \| good	11.208 \| good	29.172 \| good	0.218 \| good	5.104 \| good	0.135 \| good
2025-06-20T04:00:00.000Z	44 \| good	7.56 \| good	11.669 \| good	27.429 \| good	0.236 \| good	5.658 \| good	0.135 \| good
2025-06-20T05:00:00.000Z	44 \| good	8.004 \| good	12.965 \| good	26.205 \| good	0.354 \| good	5.896 \| good	0.142 \| good
2025-06-20T06:00:00.000Z	52 \| moderate	9.995 \| good	14.978 \| good	24.8 \| good	0.548 \| good	6.816 \| good	0.153 \| good
2025-06-20T07:00:00.000Z	52 \| moderate	10.295 \| good	16.603 \| good	24.095 \| good	0.638 \| good	8.179 \| good	0.161 \| good
2025-06-20T08:00:00.000Z	49 \| good	9.221 \| good	15.294 \| good	27.064 \| good	0.728 \| good	8.314 \| good	0.162 \| good
2025-06-20T09:00:00.000Z	44 \| good	8.223 \| good	12.417 \| good	31.614 \| good	0.742 \| good	7.633 \| good	0.161 \| good
2025-06-20T10:00:00.000Z	44 \| good	7.765 \| good	10.286 \| good	35.514 \| good	0.681 \| good	6.841 \| good	0.159 \| good
2025-06-20T11:00:00.000Z	38 \| good	7.087 \| good	10.043 \| good	39.318 \| good	0.632 \| good	5.687 \| good	0.158 \| good
2025-06-20T12:00:00.000Z	41 \| good	7.076 \| good	10.345 \| good	43.607 \| good	0.544 \| good	4.752 \| good	0.154 \| good
2025-06-20T13:00:00.000Z	43 \| good	6.751 \| good	10.202 \| good	45.657 \| good	0.489 \| good	3.601 \| good	0.15 \| good
2025-06-20T14:00:00.000Z	44 \| good	6.636 \| good	9.607 \| good	47.81 \| good	0.423 \| good	3.045 \| good	0.149 \| good
2025-06-20T15:00:00.000Z	44 \| good	6.555 \| good	9.096 \| good	47.905 \| good	0.405 \| good	3.207 \| good	0.147 \| good
2025-06-20T16:00:00.000Z	44 \| good	6.22 \| good	8.703 \| good	47.095 \| good	0.429 \| good	3.821 \| good	0.147 \| good
2025-06-20T17:00:00.000Z	44 \| good	6.291 \| good	9.162 \| good	47.158 \| good	0.432 \| good	4.077 \| good	0.15 \| good
2025-06-20T18:00:00.000Z	43 \| good	6.656 \| good	8.797 \| good	46.128 \| good	0.505 \| good	4.202 \| good	0.149 \| good
2025-06-20T19:00:00.000Z	41 \| good	6.788 \| good	8.762 \| good	43.953 \| good	0.658 \| good	4.232 \| good	0.151 \| good
2025-06-20T20:00:00.000Z	38 \| good	7.4 \| good	9.463 \| good	38.951 \| good	0.645 \| good	5.35 \| good	0.15 \| good
2025-06-20T21:00:00.000Z	44 \| good	8.143 \| good	10.608 \| good	39.848 \| good	0.662 \| good	6.464 \| good	0.153 \| good
2025-06-20T22:00:00.000Z	49 \| good	8.881 \| good	13.148 \| good	38.959 \| good	0.667 \| good	7.873 \| good	0.157 \| good
2025-06-20T23:00:00.000Z	52 \| moderate	9.683 \| good	13.808 \| good	35.621 \| good	0.639 \| good	8.378 \| good	0.157 \| good
2025-06-21T00:00:00.000Z	54 \| moderate	11.47 \| good	15.65 \| good	33.999 \| good	0.533 \| good	8.285 \| good	0.156 \| good
2025-06-21T01:00:00.000Z	58 \| moderate	12.952 \| fine	17.197 \| good	34.023 \| good	0.449 \| good	8.136 \| good	0.159 \| good
2025-06-21T02:00:00.000Z	62 \| moderate	14.748 \| fine	17.731 \| good	30.794 \| good	0.419 \| good	9.353 \| good	0.167 \| good
2025-06-21T03:00:00.000Z	60 \| moderate	13.875 \| fine	18.988 \| good	25.768 \| good	0.409 \| good	9.378 \| good	0.174 \| good
2025-06-21T04:00:00.000Z	58 \| moderate	12.72 \| fine	18.072 \| good	21.444 \| good	0.44 \| good	9.335 \| good	0.172 \| good
2025-06-21T05:00:00.000Z	56 \| moderate	12.283 \| fine	17.049 \| good	23.257 \| good	0.558 \| good	8.371 \| good	0.17 \| good
2025-06-21T06:00:00.000Z	54 \| moderate	11.244 \| good	15.357 \| good	24.411 \| good	0.618 \| good	7.963 \| good	0.173 \| good
2025-06-21T07:00:00.000Z	52 \| moderate	10.136 \| good	13.184 \| good	28.257 \| good	0.77 \| good	7.274 \| good	0.18 \| good
2025-06-21T08:00:00.000Z	44 \| good	8.171 \| good	11.28 \| good	33.783 \| good	0.798 \| good	6.07 \| good	0.183 \| good

Harpenden

Get reliable air quality data to drive your business

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

0.02ppm

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

Air quality levels in UK

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

View Polluted Cities

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

View Clean Cities

Frequently asked questions

How often is 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 05:00:00 on 2025-06-19.

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 2025-06-18.

What is the AQI in Harpenden, Hertfordshire right now?

As of now, the AQI in Harpenden, Hertfordshire is 38, indicating Good conditions.

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

Harpenden, Hertfordshire air has the highest levels of PM2.5.

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 6.947 μg/m³.

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

The PM₁₀ concentration in Harpenden, Hertfordshire is 18.367 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 0.016 ppm.

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

Currently, Harpenden, Hertfordshire has a sulfur dioxide (SO₂) concentration of 0.939 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 25.554 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 8.606 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-06-17T23:00:00.000Z	32 \| good	5.242 \| good	16.358 \| good	35.3 \| good	0.992 \| good	5.087 \| good	0.25 \| good
2025-06-18T00:00:00.000Z	31 \| good	5.264 \| good	12.073 \| good	34.491 \| good	1.048 \| good	4.364 \| good	0.279 \| good
2025-06-18T01:00:00.000Z	31 \| good	5.114 \| good	15.139 \| good	33.194 \| good	0.958 \| good	4.238 \| good	0.216 \| good
2025-06-18T02:00:00.000Z	33 \| good	6.036 \| good	10.781 \| good	34.205 \| good	0.803 \| good	3.055 \| good	0.221 \| good
2025-06-18T03:00:00.000Z	31 \| good	5.3 \| good	17.416 \| good	33.161 \| good	1.113 \| good	4.647 \| good	0.226 \| good
2025-06-18T04:00:00.000Z	44 \| good	8.099 \| good	10.878 \| good	31.806 \| good	0.997 \| good	5.263 \| good	0.278 \| good
2025-06-18T05:00:00.000Z	38 \| good	6.825 \| good	15.535 \| good	27.664 \| good	0.908 \| good	5.961 \| good	0.249 \| good
2025-06-18T06:00:00.000Z	38 \| good	6.769 \| good	10.732 \| good	28.359 \| good	0.99 \| good	4.113 \| good	0.271 \| good
2025-06-18T07:00:00.000Z	33 \| good	6.262 \| good	16.482 \| good	27.663 \| good	0.992 \| good	8.61 \| good	0.268 \| good
2025-06-18T08:00:00.000Z	33 \| good	6.266 \| good	11.033 \| good	22.084 \| good	0.996 \| good	5.851 \| good	0.254 \| good
2025-06-18T09:00:00.000Z	27 \| good	5.222 \| good	12.294 \| good	23.229 \| good	0.994 \| good	5.408 \| good	0.245 \| good
2025-06-18T10:00:00.000Z	27 \| good	4.997 \| good	21.54 \| good	23.911 \| good	1.085 \| good	4.462 \| good	0.235 \| good
2025-06-18T11:00:00.000Z	33 \| good	6.361 \| good	15.163 \| good	23.053 \| good	1.277 \| good	4.272 \| good	0.246 \| good
2025-06-18T12:00:00.000Z	27 \| good	5.302 \| good	21.732 \| good	26.821 \| good	1.186 \| good	4.86 \| good	0.235 \| good
2025-06-18T13:00:00.000Z	27 \| good	5.248 \| good	15.99 \| good	28.158 \| good	1.185 \| good	4.915 \| good	0.239 \| good
2025-06-18T14:00:00.000Z	38 \| good	6.793 \| good	14.909 \| good	29.228 \| good	0.952 \| good	4.644 \| good	0.23 \| good
2025-06-18T15:00:00.000Z	34 \| good	5.48 \| good	14.541 \| good	37.471 \| good	1 \| good	4.344 \| good	0.243 \| good
2025-06-18T16:00:00.000Z	31 \| good	4.922 \| good	14.703 \| good	34.185 \| good	1.139 \| good	4.371 \| good	0.242 \| good
2025-06-18T17:00:00.000Z	38 \| good	7.26 \| good	11.165 \| good	40.318 \| good	1.141 \| good	5.147 \| good	0.235 \| good
2025-06-18T18:00:00.000Z	38 \| good	5.909 \| good	11.227 \| good	41.4 \| good	1.09 \| good	4.75 \| good	0.281 \| good
2025-06-18T19:00:00.000Z	44 \| good	4.668 \| good	10.961 \| good	47.73 \| good	0.87 \| good	4.931 \| good	0.378 \| good
2025-06-18T20:00:00.000Z	45 \| good	7.005 \| good	12.94 \| good	48.584 \| good	0.995 \| good	7.511 \| good	0.335 \| good
2025-06-18T21:00:00.000Z	41 \| good	5.75 \| good	17.591 \| good	44.383 \| good	0.976 \| good	6.98 \| good	0.35 \| good
2025-06-18T22:00:00.000Z	41 \| good	5.318 \| good	13.97 \| good	44.37 \| good	0.955 \| good	6.276 \| good	0.376 \| good
2025-06-18T23:00:00.000Z	41 \| good	7.11 \| good	12.97 \| good	43.942 \| good	0.922 \| good	6.342 \| good	0.369 \| good
2025-06-19T00:00:00.000Z	39 \| good	6.354 \| good	14.45 \| good	41.675 \| good	1.036 \| good	6.132 \| good	0.329 \| good
2025-06-19T01:00:00.000Z	38 \| good	7.11 \| good	10.906 \| good	40.96 \| good	1.016 \| good	5.777 \| good	0.295 \| good
2025-06-19T02:00:00.000Z	49 \| good	9.439 \| good	19.604 \| good	34.559 \| good	1.106 \| good	7.383 \| good	0.322 \| good
2025-06-19T03:00:00.000Z	44 \| good	8.164 \| good	19.962 \| good	35.179 \| good	1.122 \| good	9.246 \| good	0.348 \| good
2025-06-19T04:00:00.000Z	49 \| good	9.13 \| good	16.874 \| good	27.941 \| good	1.042 \| good	6.503 \| good	0.356 \| good
2025-06-19T05:00:00.000Z	52 \| moderate	9.506 \| good	15.869 \| good	31.221 \| good	1.07 \| good	9.801 \| good	0.021 \| good
2025-06-19T06:00:00.000Z	44 \| good	7.565 \| good	15 \| good	28.165 \| good	0.947 \| good	5.296 \| good	0.016 \| good
2025-06-19T07:00:00.000Z	38 \| good	6.947 \| good	18.367 \| good	25.554 \| good	0.939 \| good	8.606 \| good	0.016 \| good
2025-06-19T08:00:00.000Z	49 \| good	8.828 \| good	21.062 \| good	25.021 \| good	1.048 \| good	13.603 \| good	0.016 \| good
2025-06-19T09:00:00.000Z	54 \| moderate	10.958 \| good	15.697 \| good	36.517 \| good	1.204 \| good	5.397 \| good	0.015 \| good
2025-06-19T10:00:00.000Z	44 \| good	8.149 \| good	26.549 \| good	28.787 \| good	1.311 \| good	5.777 \| good	0.015 \| good
2025-06-19T11:00:00.000Z	49 \| good	9.344 \| good	17.392 \| good	28.881 \| good	2.043 \| good	9.414 \| good	0.015 \| good
2025-06-19T12:00:00.000Z	44 \| good	7.862 \| good	10.464 \| good	31.76 \| good	1.287 \| good	7.75 \| good	0.01 \| good
2025-06-19T13:00:00.000Z	49 \| good	8.992 \| good	21.911 \| good	32.809 \| good	1.147 \| good	10.971 \| good	0.014 \| good
2025-06-19T14:00:00.000Z	49 \| good	8.715 \| good	13.724 \| good	42.968 \| good	1.171 \| good	16.413 \| good	0.015 \| good
2025-06-19T15:00:00.000Z	49 \| good	8.666 \| good	14.795 \| good	48.399 \| good	1.109 \| good	19.135 \| good	0.016 \| good
2025-06-19T16:00:00.000Z	49 \| good	9.276 \| good	14.539 \| good	52.637 \| good	1.107 \| good	16.476 \| good	0.014 \| good
2025-06-19T17:00:00.000Z	52 \| moderate	10.011 \| good	19.046 \| good	53.837 \| good	1.17 \| good	12.637 \| good	0.015 \| good
2025-06-19T18:00:00.000Z	58 \| moderate	9.732 \| good	20.401 \| good	56.571 \| fine	1.177 \| good	15.029 \| good	0.016 \| good
2025-06-19T19:00:00.000Z	49 \| good	8.587 \| good	21.558 \| good	49.594 \| good	1.161 \| good	14.232 \| good	0.016 \| good
2025-06-19T20:00:00.000Z	48 \| good	8.477 \| good	18.323 \| good	52.347 \| good	1.235 \| good	12.436 \| good	0.017 \| good
2025-06-19T21:00:00.000Z	71 \| moderate	11.266 \| good	25.58 \| good	60.946 \| fine	1.459 \| good	14.387 \| good	0.018 \| good
2025-06-19T22:00:00.000Z	44 \| good	6.18 \| good	36.289 \| good	48.26 \| good	1.352 \| good	11.345 \| good	0.014 \| good
2025-06-19T22:00:00.000Z	44 \| good	6.18 \| good	36.289 \| good	48.26 \| good	1.352 \| good	11.345 \| good	0.014 \| good
2025-06-19T09:00:00.000Z	54 \| moderate	11.049 \| good	16.741 \| good	35.494 \| good	0.633 \| good	7.128 \| good	0.163 \| good
2025-06-19T10:00:00.000Z	52 \| moderate	10.066 \| good	14.756 \| good	46.27 \| good	0.487 \| good	4.998 \| good	0.161 \| good
2025-06-19T11:00:00.000Z	54 \| moderate	10.09 \| good	12.966 \| good	55.563 \| fine	0.406 \| good	3.375 \| good	0.157 \| good
2025-06-19T12:00:00.000Z	71 \| moderate	9.473 \| good	12.892 \| good	60.868 \| fine	0.363 \| good	2.903 \| good	0.153 \| good
2025-06-19T13:00:00.000Z	80 \| moderate	8.959 \| good	12.392 \| good	63.706 \| fine	0.344 \| good	2.471 \| good	0.152 \| good
2025-06-19T14:00:00.000Z	84 \| moderate	9.035 \| good	11.795 \| good	65.272 \| fine	0.322 \| good	2.385 \| good	0.151 \| good
2025-06-19T15:00:00.000Z	90 \| moderate	9.311 \| good	11.834 \| good	67.085 \| fine	0.31 \| good	2.627 \| good	0.149 \| good
2025-06-19T16:00:00.000Z	87 \| moderate	9.403 \| good	12.142 \| good	66.331 \| fine	0.323 \| good	3.106 \| good	0.149 \| good
2025-06-19T17:00:00.000Z	93 \| moderate	9.797 \| good	12.664 \| good	67.644 \| fine	0.329 \| good	3.556 \| good	0.155 \| good
2025-06-19T18:00:00.000Z	77 \| moderate	9.173 \| good	12.79 \| good	62.998 \| fine	0.377 \| good	3.982 \| good	0.161 \| good
2025-06-19T19:00:00.000Z	50 \| good	8.097 \| good	10.414 \| good	53.917 \| good	0.399 \| good	4.839 \| good	0.152 \| good
2025-06-19T20:00:00.000Z	44 \| good	8.037 \| good	9.779 \| good	46.575 \| good	0.41 \| good	5.653 \| good	0.149 \| good
2025-06-19T21:00:00.000Z	39 \| good	7.4 \| good	9.91 \| good	42.32 \| good	0.4 \| good	6.59 \| good	0.146 \| good
2025-06-19T22:00:00.000Z	38 \| good	7.183 \| good	11.391 \| good	38.801 \| good	0.36 \| good	6.727 \| good	0.145 \| good
2025-06-19T23:00:00.000Z	38 \| good	6.926 \| good	11.962 \| good	36.435 \| good	0.327 \| good	6.804 \| good	0.142 \| good
2025-06-20T00:00:00.000Z	38 \| good	6.846 \| good	11.048 \| good	34.751 \| good	0.282 \| good	6.533 \| good	0.14 \| good
2025-06-20T01:00:00.000Z	38 \| good	7.107 \| good	10.948 \| good	33.438 \| good	0.256 \| good	5.869 \| good	0.138 \| good
2025-06-20T02:00:00.000Z	38 \| good	7.434 \| good	11.198 \| good	31.333 \| good	0.236 \| good	5.075 \| good	0.135 \| good
2025-06-20T03:00:00.000Z	38 \| good	7.374 \| good	11.208 \| good	29.172 \| good	0.218 \| good	5.104 \| good	0.135 \| good
2025-06-20T04:00:00.000Z	44 \| good	7.56 \| good	11.669 \| good	27.429 \| good	0.236 \| good	5.658 \| good	0.135 \| good
2025-06-20T05:00:00.000Z	44 \| good	8.004 \| good	12.965 \| good	26.205 \| good	0.354 \| good	5.896 \| good	0.142 \| good
2025-06-20T06:00:00.000Z	52 \| moderate	9.995 \| good	14.978 \| good	24.8 \| good	0.548 \| good	6.816 \| good	0.153 \| good
2025-06-20T07:00:00.000Z	52 \| moderate	10.295 \| good	16.603 \| good	24.095 \| good	0.638 \| good	8.179 \| good	0.161 \| good
2025-06-20T08:00:00.000Z	49 \| good	9.221 \| good	15.294 \| good	27.064 \| good	0.728 \| good	8.314 \| good	0.162 \| good
2025-06-20T09:00:00.000Z	44 \| good	8.223 \| good	12.417 \| good	31.614 \| good	0.742 \| good	7.633 \| good	0.161 \| good
2025-06-20T10:00:00.000Z	44 \| good	7.765 \| good	10.286 \| good	35.514 \| good	0.681 \| good	6.841 \| good	0.159 \| good
2025-06-20T11:00:00.000Z	38 \| good	7.087 \| good	10.043 \| good	39.318 \| good	0.632 \| good	5.687 \| good	0.158 \| good
2025-06-20T12:00:00.000Z	41 \| good	7.076 \| good	10.345 \| good	43.607 \| good	0.544 \| good	4.752 \| good	0.154 \| good
2025-06-20T13:00:00.000Z	43 \| good	6.751 \| good	10.202 \| good	45.657 \| good	0.489 \| good	3.601 \| good	0.15 \| good
2025-06-20T14:00:00.000Z	44 \| good	6.636 \| good	9.607 \| good	47.81 \| good	0.423 \| good	3.045 \| good	0.149 \| good
2025-06-20T15:00:00.000Z	44 \| good	6.555 \| good	9.096 \| good	47.905 \| good	0.405 \| good	3.207 \| good	0.147 \| good
2025-06-20T16:00:00.000Z	44 \| good	6.22 \| good	8.703 \| good	47.095 \| good	0.429 \| good	3.821 \| good	0.147 \| good
2025-06-20T17:00:00.000Z	44 \| good	6.291 \| good	9.162 \| good	47.158 \| good	0.432 \| good	4.077 \| good	0.15 \| good
2025-06-20T18:00:00.000Z	43 \| good	6.656 \| good	8.797 \| good	46.128 \| good	0.505 \| good	4.202 \| good	0.149 \| good
2025-06-20T19:00:00.000Z	41 \| good	6.788 \| good	8.762 \| good	43.953 \| good	0.658 \| good	4.232 \| good	0.151 \| good
2025-06-20T20:00:00.000Z	38 \| good	7.4 \| good	9.463 \| good	38.951 \| good	0.645 \| good	5.35 \| good	0.15 \| good
2025-06-20T21:00:00.000Z	44 \| good	8.143 \| good	10.608 \| good	39.848 \| good	0.662 \| good	6.464 \| good	0.153 \| good
2025-06-20T22:00:00.000Z	49 \| good	8.881 \| good	13.148 \| good	38.959 \| good	0.667 \| good	7.873 \| good	0.157 \| good
2025-06-20T23:00:00.000Z	52 \| moderate	9.683 \| good	13.808 \| good	35.621 \| good	0.639 \| good	8.378 \| good	0.157 \| good
2025-06-21T00:00:00.000Z	54 \| moderate	11.47 \| good	15.65 \| good	33.999 \| good	0.533 \| good	8.285 \| good	0.156 \| good
2025-06-21T01:00:00.000Z	58 \| moderate	12.952 \| fine	17.197 \| good	34.023 \| good	0.449 \| good	8.136 \| good	0.159 \| good
2025-06-21T02:00:00.000Z	62 \| moderate	14.748 \| fine	17.731 \| good	30.794 \| good	0.419 \| good	9.353 \| good	0.167 \| good
2025-06-21T03:00:00.000Z	60 \| moderate	13.875 \| fine	18.988 \| good	25.768 \| good	0.409 \| good	9.378 \| good	0.174 \| good
2025-06-21T04:00:00.000Z	58 \| moderate	12.72 \| fine	18.072 \| good	21.444 \| good	0.44 \| good	9.335 \| good	0.172 \| good
2025-06-21T05:00:00.000Z	56 \| moderate	12.283 \| fine	17.049 \| good	23.257 \| good	0.558 \| good	8.371 \| good	0.17 \| good
2025-06-21T06:00:00.000Z	54 \| moderate	11.244 \| good	15.357 \| good	24.411 \| good	0.618 \| good	7.963 \| good	0.173 \| good
2025-06-21T07:00:00.000Z	52 \| moderate	10.136 \| good	13.184 \| good	28.257 \| good	0.77 \| good	7.274 \| good	0.18 \| good
2025-06-21T08:00:00.000Z	44 \| good	8.171 \| good	11.28 \| good	33.783 \| good	0.798 \| good	6.07 \| good	0.183 \| good

Real-time 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)

Track live Harpenden, Hertfordshire air quality forecast and history

Get reliable air quality data to drive your business

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

Air quality in nearby cities

St Albans, Hertfordshire

Hemel Hempstead, Hertfordshire

Welwyn Garden City, Hertfordshire

Hatfield, Hertfordshire

Abbots Langley, Hertfordshire

Dunstable, Central Bedfordshire

How accurate is Hertfordshire, UK air quality data?

Air quality levels in UK

Frequently asked questions

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

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

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

What is the AQI in Harpenden, Hertfordshire right now?

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

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

What is the PM2.5 level in Harpenden, Hertfordshire at the moment?

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

What is the carbon monoxide (CO) 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?

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?