What are the current PM10 levels at Watford, Hertfordshire?

The current PM10 levels in Watford, Hertfordshire are 16.797 μg/m3.

What are the current sulfur dioxide (SO2) levels at Watford, Hertfordshire?

The current sulfur dioxide (SO2) levels in Watford, Hertfordshire are 0.779 ppb.

What are the current ozone (O3) levels at Watford, Hertfordshire?

The current ozone (O3) levels at Watford, Hertfordshire is 22.517 ppm.

What are the current nitrogen dioxide (NO2) levels at Watford, Hertfordshire?

The current nitrogen dioxide (NO2) levels at Watford, Hertfordshire is 10.404 ppb.

Real-time air quality index in Watford, Hertfordshire today

Q: What are the current PM2.5 levels in Watford, Hertfordshire?

The measured PM2.5 levels in Watford, Hertfordshire at present are 7.546 μg/m3.

Stay updated with real-time air quality in Watford, 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

Watford, Hertfordshire

Last updated: ... (Local time)

Common air pollutants in Watford, Hertfordshire

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

7.55 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

16.80 μg/m³

155

255

425

605+

Ozone (O₃)

22.52 ppb

201

201+

Sulfur Dioxide (SO₂)

0.78 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

10.40 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

1.00 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

Watford, Hertfordshire

Get Live Pollen Counts

Watford, Hertfordshire

Scroll To Air Quality Map

Track live Watford, Hertfordshire air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-03-06T02:00:00.000Z	77 \| moderate	22.795 \| fine	47.317 \| good	17.733 \| good	0.952 \| good	24.491 \| good	0.555 \| good
2026-03-06T03:00:00.000Z	77 \| moderate	22.7 \| fine	33.538 \| good	15.361 \| good	0.945 \| good	25.567 \| good	0.553 \| good
2026-03-06T04:00:00.000Z	79 \| moderate	23.866 \| fine	41.522 \| good	12.732 \| good	0.884 \| good	27.521 \| good	0.459 \| good
2026-03-06T05:00:00.000Z	79 \| moderate	24.296 \| fine	31.434 \| good	8.022 \| good	0.883 \| good	25.138 \| good	0.481 \| good
2026-03-06T06:00:00.000Z	71 \| moderate	20.059 \| fine	50.874 \| good	9.431 \| good	0.899 \| good	28.697 \| good	0.483 \| good
2026-03-06T07:00:00.000Z	75 \| moderate	21.68 \| fine	79.465 \| fine	7.686 \| good	1.032 \| good	23.905 \| good	0.011 \| good
2026-03-06T08:00:00.000Z	67 \| moderate	17.63 \| fine	41.399 \| good	4.394 \| good	1.029 \| good	16.999 \| good	0.018 \| good
2026-03-06T09:00:00.000Z	77 \| moderate	23.108 \| fine	43.346 \| good	4.938 \| good	1.029 \| good	25.004 \| good	0.016 \| good
2026-03-06T10:00:00.000Z	71 \| moderate	19.535 \| fine	36.907 \| good	7.18 \| good	0.885 \| good	21.598 \| good	0.012 \| good
2026-03-06T11:00:00.000Z	81 \| moderate	24.78 \| fine	34.552 \| good	9.162 \| good	0.684 \| good	21.303 \| good	0.011 \| good
2026-03-06T12:00:00.000Z	73 \| moderate	21.169 \| fine	38.358 \| good	9.895 \| good	0.692 \| good	28.984 \| good	0.008 \| good
2026-03-06T13:00:00.000Z	79 \| moderate	24.045 \| fine	65.509 \| fine	14.336 \| good	0.673 \| good	26.649 \| good	0.006 \| good
2026-03-06T14:00:00.000Z	79 \| moderate	24.349 \| fine	44.634 \| good	12.147 \| good	0.692 \| good	10.681 \| good	0.005 \| good
2026-03-06T15:00:00.000Z	75 \| moderate	22.4 \| fine	42.64 \| good	9.564 \| good	0.581 \| good	12.928 \| good	0.005 \| good
2026-03-06T16:00:00.000Z	77 \| moderate	23.327 \| fine	61.012 \| fine	13.414 \| good	0.741 \| good	12.874 \| good	0.005 \| good
2026-03-06T17:00:00.000Z	75 \| moderate	22.094 \| fine	60.831 \| fine	11.301 \| good	0.644 \| good	17.402 \| good	0.007 \| good
2026-03-06T18:00:00.000Z	75 \| moderate	21.631 \| fine	37.846 \| good	13.978 \| good	0.699 \| good	13.388 \| good	0.007 \| good
2026-03-06T19:00:00.000Z	73 \| moderate	20.904 \| fine	45.491 \| good	11.396 \| good	0.679 \| good	17.408 \| good	0.01 \| good
2026-03-06T20:00:00.000Z	79 \| moderate	24.401 \| fine	46.2 \| good	19.587 \| good	0.913 \| good	26.904 \| good	0.023 \| good
2026-03-06T21:00:00.000Z	71 \| moderate	20.422 \| fine	41.751 \| good	20.251 \| good	0.816 \| good	14.223 \| good	0.03 \| good
2026-03-06T22:00:00.000Z	71 \| moderate	20.417 \| fine	84.372 \| fine	20.661 \| good	0.812 \| good	8.916 \| good	0.02 \| good
2026-03-06T23:00:00.000Z	77 \| moderate	23.382 \| fine	33.26 \| good	19.2 \| good	0.725 \| good	19.783 \| good	0.024 \| good
2026-03-07T00:00:00.000Z	52 \| moderate	9.591 \| good	28.259 \| good	16.514 \| good	0.694 \| good	8.674 \| good	0.934 \| good
2026-03-07T01:00:00.000Z	56 \| moderate	11.88 \| good	30.569 \| good	22.619 \| good	0.717 \| good	9.803 \| good	0.792 \| good
2026-03-07T02:00:00.000Z	54 \| moderate	11.28 \| good	52.466 \| good	22.771 \| good	0.616 \| good	5.969 \| good	0.74 \| good
2026-03-07T03:00:00.000Z	56 \| moderate	12.152 \| fine	20.043 \| good	29.879 \| good	0.592 \| good	4.049 \| good	0.6 \| good
2026-03-07T04:00:00.000Z	44 \| good	8.013 \| good	14.929 \| good	29.223 \| good	0.588 \| good	3.815 \| good	0.55 \| good
2026-03-07T05:00:00.000Z	27 \| good	5.04 \| good	17.211 \| good	29.144 \| good	0.588 \| good	3.978 \| good	0.499 \| good
2026-03-07T06:00:00.000Z	58 \| moderate	13.334 \| fine	23.325 \| good	31.458 \| good	0.588 \| good	2.721 \| good	0.463 \| good
2026-03-07T07:00:00.000Z	44 \| good	7.76 \| good	19.693 \| good	26.109 \| good	0.662 \| good	4.278 \| good	0.016 \| good
2026-03-07T08:00:00.000Z	52 \| moderate	9.734 \| good	23.618 \| good	27.117 \| good	0.679 \| good	4.847 \| good	0.015 \| good
2026-03-07T09:00:00.000Z	52 \| moderate	9.925 \| good	19.102 \| good	22.702 \| good	0.675 \| good	7.481 \| good	0.013 \| good
2026-03-07T10:00:00.000Z	49 \| good	8.646 \| good	20.666 \| good	23.182 \| good	0.822 \| good	7.908 \| good	0.01 \| good
2026-03-07T11:00:00.000Z	44 \| good	8.359 \| good	15.548 \| good	22.359 \| good	0.764 \| good	5.588 \| good	0.008 \| good
2026-03-07T12:00:00.000Z	33 \| good	6.251 \| good	8.989 \| good	21.413 \| good	0.752 \| good	5.613 \| good	0.006 \| good
2026-03-07T13:00:00.000Z	38 \| good	7.276 \| good	10.01 \| good	26.891 \| good	0.759 \| good	6.581 \| good	0.005 \| good
2026-03-07T14:00:00.000Z	27 \| good	5.019 \| good	7.226 \| good	28.908 \| good	0.685 \| good	8.084 \| good	0.005 \| good
2026-03-07T15:00:00.000Z	27 \| good	4.81 \| good	8.155 \| good	28.114 \| good	0.834 \| good	9.007 \| good	0.005 \| good
2026-03-07T16:00:00.000Z	33 \| good	6.142 \| good	8.739 \| good	28.663 \| good	0.824 \| good	7.664 \| good	0.006 \| good
2026-03-07T17:00:00.000Z	27 \| good	5.287 \| good	8.726 \| good	26.433 \| good	0.773 \| good	6.683 \| good	0.008 \| good
2026-03-07T18:00:00.000Z	27 \| good	4.666 \| good	21.761 \| good	28.949 \| good	0.733 \| good	6.788 \| good	0.009 \| good
2026-03-07T19:00:00.000Z	38 \| good	7.28 \| good	9.8 \| good	31.392 \| good	0.76 \| good	6.974 \| good	0.011 \| good
2026-03-07T20:00:00.000Z	24 \| good	3.75 \| good	3.93 \| good	26.291 \| good	0.781 \| good	8.229 \| good	0.018 \| good
2026-03-07T21:00:00.000Z	23 \| good	3.44 \| good	9 \| good	25.233 \| good	0.861 \| good	11.1 \| good	0.025 \| good
2026-03-07T22:00:00.000Z	24 \| good	2.7 \| good	11.42 \| good	25.558 \| good	0.869 \| good	9.766 \| good	0.026 \| good
2026-03-07T23:00:00.000Z	33 \| good	5.98 \| good	10.401 \| good	28.245 \| good	0.707 \| good	8.231 \| good	0.029 \| good
2026-03-08T00:00:00.000Z	44 \| good	7.546 \| good	16.797 \| good	22.517 \| good	0.779 \| good	10.404 \| good	1.005 \| good
2026-03-08T01:00:00.000Z	44 \| good	7.546 \| good	16.797 \| good	22.517 \| good	0.779 \| good	10.404 \| good	1.005 \| good
2026-03-08T02:00:00.000Z	71 \| moderate	20.361 \| fine	31.173 \| good	16.527 \| good	0.843 \| good	10.532 \| good	0.187 \| good
2026-03-08T03:00:00.000Z	73 \| moderate	20.617 \| fine	33.533 \| good	17.402 \| good	0.713 \| good	8.682 \| good	0.18 \| good
2026-03-08T04:00:00.000Z	71 \| moderate	19.945 \| fine	34.556 \| good	18.237 \| good	0.656 \| good	7.524 \| good	0.174 \| good
2026-03-08T05:00:00.000Z	71 \| moderate	19.664 \| fine	35.55 \| good	19.19 \| good	0.65 \| good	6.245 \| good	0.172 \| good
2026-03-08T06:00:00.000Z	71 \| moderate	20.286 \| fine	40.346 \| good	20.073 \| good	0.619 \| good	6.184 \| good	0.175 \| good
2026-03-08T07:00:00.000Z	73 \| moderate	20.753 \| fine	41.735 \| good	18.942 \| good	0.762 \| good	7.799 \| good	0.182 \| good
2026-03-08T08:00:00.000Z	77 \| moderate	23.106 \| fine	43.749 \| good	18.358 \| good	0.901 \| good	9.455 \| good	0.194 \| good
2026-03-08T09:00:00.000Z	79 \| moderate	23.744 \| fine	45.697 \| good	17.262 \| good	1.001 \| good	9.683 \| good	0.202 \| good
2026-03-08T10:00:00.000Z	81 \| moderate	25.389 \| fine	43.744 \| good	17.634 \| good	1.038 \| good	9.949 \| good	0.211 \| good
2026-03-08T11:00:00.000Z	92 \| moderate	31.212 \| fine	41.453 \| good	16.689 \| good	1.053 \| good	10.758 \| good	0.222 \| good
2026-03-08T12:00:00.000Z	94 \| moderate	31.921 \| fine	43.055 \| good	15.406 \| good	1.127 \| good	11.754 \| good	0.231 \| good
2026-03-08T13:00:00.000Z	94 \| moderate	32.4 \| fine	46.385 \| good	17.95 \| good	1.212 \| good	12.871 \| good	0.255 \| good
2026-03-08T14:00:00.000Z	96 \| moderate	33.255 \| fine	46.809 \| good	18.465 \| good	1.307 \| good	14.472 \| good	0.264 \| good
2026-03-08T15:00:00.000Z	99 \| moderate	34.587 \| fine	50.152 \| good	19.26 \| good	1.383 \| good	14.182 \| good	0.262 \| good
2026-03-08T16:00:00.000Z	112 \| sensitive	39.747 \| moderate	50.801 \| good	19.144 \| good	1.468 \| good	15.7 \| good	0.277 \| good
2026-03-08T17:00:00.000Z	117 \| sensitive	41.87 \| moderate	52.959 \| good	17.918 \| good	1.571 \| good	19.588 \| good	0.307 \| good
2026-03-08T18:00:00.000Z	124 \| sensitive	44.699 \| moderate	56.46 \| fine	13.112 \| good	1.845 \| good	24.537 \| good	0.32 \| good
2026-03-08T19:00:00.000Z	132 \| sensitive	47.993 \| moderate	59.575 \| fine	6.713 \| good	1.909 \| good	29.215 \| good	0.334 \| good
2026-03-08T20:00:00.000Z	147 \| sensitive	54.146 \| moderate	66.197 \| fine	3.69 \| good	1.843 \| good	29.144 \| good	0.331 \| good
2026-03-08T21:00:00.000Z	151 \| unhealthy	55.657 \| poor	67.27 \| fine	2.624 \| good	1.78 \| good	29.454 \| good	0.333 \| good
2026-03-08T22:00:00.000Z	144 \| sensitive	52.679 \| moderate	62.488 \| fine	2.045 \| good	1.72 \| good	29.732 \| good	0.339 \| good
2026-03-08T23:00:00.000Z	144 \| sensitive	53.133 \| moderate	58.894 \| fine	1.616 \| good	1.704 \| good	29.767 \| good	0.336 \| good
2026-03-09T00:00:00.000Z	147 \| sensitive	54.319 \| moderate	58.891 \| fine	2.393 \| good	1.535 \| good	29.843 \| good	0.333 \| good
2026-03-09T01:00:00.000Z	149 \| sensitive	55.29 \| moderate	59.33 \| fine	3.256 \| good	1.413 \| good	28.077 \| good	0.332 \| good
2026-03-09T02:00:00.000Z	151 \| unhealthy	56.209 \| poor	60.245 \| fine	3.63 \| good	1.308 \| good	26.251 \| good	0.334 \| good
2026-03-09T03:00:00.000Z	152 \| unhealthy	56.772 \| poor	61.204 \| fine	3.157 \| good	1.206 \| good	24.681 \| good	0.339 \| good
2026-03-09T04:00:00.000Z	151 \| unhealthy	56.034 \| poor	60.88 \| fine	2.841 \| good	1.078 \| good	23.075 \| good	0.341 \| good
2026-03-09T05:00:00.000Z	144 \| sensitive	52.71 \| moderate	59.824 \| fine	2.853 \| good	1.11 \| good	21.382 \| good	0.343 \| good
2026-03-09T06:00:00.000Z	137 \| sensitive	50.083 \| moderate	56.342 \| fine	3.106 \| good	1.283 \| good	20.89 \| good	0.347 \| good
2026-03-09T07:00:00.000Z	129 \| sensitive	46.921 \| moderate	52.194 \| good	3.562 \| good	1.237 \| good	21.531 \| good	0.351 \| good
2026-03-09T08:00:00.000Z	127 \| sensitive	46.161 \| moderate	52.052 \| good	4.718 \| good	1.198 \| good	22.419 \| good	0.348 \| good
2026-03-09T09:00:00.000Z	132 \| sensitive	48.333 \| moderate	54.529 \| good	6.429 \| good	1.238 \| good	23.288 \| good	0.348 \| good
2026-03-09T10:00:00.000Z	132 \| sensitive	48.448 \| moderate	53.441 \| good	8.186 \| good	1.23 \| good	22.528 \| good	0.343 \| good
2026-03-09T11:00:00.000Z	107 \| sensitive	37.523 \| moderate	45.546 \| good	9.902 \| good	1.207 \| good	21.743 \| good	0.314 \| good
2026-03-09T12:00:00.000Z	97 \| moderate	34.166 \| fine	41.775 \| good	12.038 \| good	1.324 \| good	21.684 \| good	0.304 \| good
2026-03-09T13:00:00.000Z	90 \| moderate	29.747 \| fine	34.976 \| good	16.804 \| good	0.901 \| good	19.821 \| good	0.272 \| good
2026-03-09T14:00:00.000Z	84 \| moderate	26.654 \| fine	31.559 \| good	23.804 \| good	0.761 \| good	18.225 \| good	0.244 \| good
2026-03-09T15:00:00.000Z	82 \| moderate	26.469 \| fine	29.636 \| good	25.14 \| good	0.721 \| good	15.877 \| good	0.223 \| good
2026-03-09T16:00:00.000Z	79 \| moderate	24.061 \| fine	26.636 \| good	24.341 \| good	0.748 \| good	15.81 \| good	0.212 \| good
2026-03-09T17:00:00.000Z	75 \| moderate	22.318 \| fine	24.733 \| good	21.429 \| good	0.827 \| good	17.548 \| good	0.215 \| good
2026-03-09T18:00:00.000Z	75 \| moderate	21.545 \| fine	25.488 \| good	17.301 \| good	1.095 \| good	22.677 \| good	0.222 \| good
2026-03-09T19:00:00.000Z	73 \| moderate	21.473 \| fine	25.708 \| good	13.437 \| good	1.193 \| good	26.014 \| good	0.258 \| good
2026-03-09T20:00:00.000Z	71 \| moderate	19.796 \| fine	22.736 \| good	9.562 \| good	1.249 \| good	28.349 \| good	0.252 \| good
2026-03-09T21:00:00.000Z	71 \| moderate	19.644 \| fine	23.083 \| good	11.958 \| good	1.267 \| good	26.015 \| good	0.232 \| good
2026-03-09T22:00:00.000Z	77 \| moderate	22.777 \| fine	26.453 \| good	13.858 \| good	1.091 \| good	21.543 \| good	0.209 \| good
2026-03-09T23:00:00.000Z	79 \| moderate	23.759 \| fine	28.328 \| good	14.905 \| good	0.96 \| good	18.737 \| good	0.197 \| good
2026-03-10T00:00:00.000Z	75 \| moderate	22.214 \| fine	27.354 \| good	15.828 \| good	0.731 \| good	15.661 \| good	0.185 \| good
2026-03-10T01:00:00.000Z	77 \| moderate	22.855 \| fine	27.351 \| good	14.636 \| good	0.639 \| good	14.041 \| good	0.176 \| good

Watford

Empower business decisions with accurate air quality data

Watford, Hertfordshire air quality map: Real-time AQI near you

1.00ppm

How accurate is Hertfordshire, UK air quality data?

Air quality measurements for Hertfordshire, UK meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.

Source: Ambee Data Sources

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Frequently asked questions

How frequently is the air quality data for Watford, Hertfordshire updated?

Air quality data for Watford, Hertfordshire is updated on an hourly basis.

When did Watford, Hertfordshire experience the worst air quality in the last 24 hours?

The worst air quality in Watford, Hertfordshire was recorded at 06:00:00 on 2026-03-07.

When did Watford, Hertfordshire have its best air quality in the last 24 hours?

The best air quality in Watford, Hertfordshire was recorded at 09:00:00 on 2026-03-07.

What is the real-time air quality index for Watford, Hertfordshire?

The real-time air quality index in Watford, Hertfordshire is 44, currently categorized as Good.

Which pollutant is found most often in Watford, Hertfordshire?

The most common pollutant in Watford, Hertfordshire is PM2.5.

What can I do if the air quality in Watford, Hertfordshire is poor?

If the air quality in Watford, Hertfordshire is poor, limit outdoor activities and use a mask to safeguard your health.

What are the current PM_2.5 levels in Watford, Hertfordshire?

The measured PM_2.5 levels in Watford, Hertfordshire at present are 7.546 μg/m³.

What are the current PM₁₀ levels at Watford, Hertfordshire?

The current PM₁₀ levels in Watford, Hertfordshire are 16.797 μg/m³.

What are the current carbon monoxide (CO) levels at Watford, Hertfordshire?

The current carbon monoxide (CO) level in Watford, Hertfordshire is 1.005 ppm.

What are the current sulfur dioxide (SO₂) levels at Watford, Hertfordshire?

The current sulfur dioxide (SO₂) levels in Watford, Hertfordshire are 0.779 ppb.

What are the current ozone (O₃) levels at Watford, Hertfordshire?

The current ozone (O₃) levels at Watford, Hertfordshire is 22.517 ppm.

What are the current nitrogen dioxide (NO₂) levels at Watford, Hertfordshire?

The current nitrogen dioxide (NO₂) levels at Watford, Hertfordshire is 10.404 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-03-06T02:00:00.000Z	77 \| moderate	22.795 \| fine	47.317 \| good	17.733 \| good	0.952 \| good	24.491 \| good	0.555 \| good
2026-03-06T03:00:00.000Z	77 \| moderate	22.7 \| fine	33.538 \| good	15.361 \| good	0.945 \| good	25.567 \| good	0.553 \| good
2026-03-06T04:00:00.000Z	79 \| moderate	23.866 \| fine	41.522 \| good	12.732 \| good	0.884 \| good	27.521 \| good	0.459 \| good
2026-03-06T05:00:00.000Z	79 \| moderate	24.296 \| fine	31.434 \| good	8.022 \| good	0.883 \| good	25.138 \| good	0.481 \| good
2026-03-06T06:00:00.000Z	71 \| moderate	20.059 \| fine	50.874 \| good	9.431 \| good	0.899 \| good	28.697 \| good	0.483 \| good
2026-03-06T07:00:00.000Z	75 \| moderate	21.68 \| fine	79.465 \| fine	7.686 \| good	1.032 \| good	23.905 \| good	0.011 \| good
2026-03-06T08:00:00.000Z	67 \| moderate	17.63 \| fine	41.399 \| good	4.394 \| good	1.029 \| good	16.999 \| good	0.018 \| good
2026-03-06T09:00:00.000Z	77 \| moderate	23.108 \| fine	43.346 \| good	4.938 \| good	1.029 \| good	25.004 \| good	0.016 \| good
2026-03-06T10:00:00.000Z	71 \| moderate	19.535 \| fine	36.907 \| good	7.18 \| good	0.885 \| good	21.598 \| good	0.012 \| good
2026-03-06T11:00:00.000Z	81 \| moderate	24.78 \| fine	34.552 \| good	9.162 \| good	0.684 \| good	21.303 \| good	0.011 \| good
2026-03-06T12:00:00.000Z	73 \| moderate	21.169 \| fine	38.358 \| good	9.895 \| good	0.692 \| good	28.984 \| good	0.008 \| good
2026-03-06T13:00:00.000Z	79 \| moderate	24.045 \| fine	65.509 \| fine	14.336 \| good	0.673 \| good	26.649 \| good	0.006 \| good
2026-03-06T14:00:00.000Z	79 \| moderate	24.349 \| fine	44.634 \| good	12.147 \| good	0.692 \| good	10.681 \| good	0.005 \| good
2026-03-06T15:00:00.000Z	75 \| moderate	22.4 \| fine	42.64 \| good	9.564 \| good	0.581 \| good	12.928 \| good	0.005 \| good
2026-03-06T16:00:00.000Z	77 \| moderate	23.327 \| fine	61.012 \| fine	13.414 \| good	0.741 \| good	12.874 \| good	0.005 \| good
2026-03-06T17:00:00.000Z	75 \| moderate	22.094 \| fine	60.831 \| fine	11.301 \| good	0.644 \| good	17.402 \| good	0.007 \| good
2026-03-06T18:00:00.000Z	75 \| moderate	21.631 \| fine	37.846 \| good	13.978 \| good	0.699 \| good	13.388 \| good	0.007 \| good
2026-03-06T19:00:00.000Z	73 \| moderate	20.904 \| fine	45.491 \| good	11.396 \| good	0.679 \| good	17.408 \| good	0.01 \| good
2026-03-06T20:00:00.000Z	79 \| moderate	24.401 \| fine	46.2 \| good	19.587 \| good	0.913 \| good	26.904 \| good	0.023 \| good
2026-03-06T21:00:00.000Z	71 \| moderate	20.422 \| fine	41.751 \| good	20.251 \| good	0.816 \| good	14.223 \| good	0.03 \| good
2026-03-06T22:00:00.000Z	71 \| moderate	20.417 \| fine	84.372 \| fine	20.661 \| good	0.812 \| good	8.916 \| good	0.02 \| good
2026-03-06T23:00:00.000Z	77 \| moderate	23.382 \| fine	33.26 \| good	19.2 \| good	0.725 \| good	19.783 \| good	0.024 \| good
2026-03-07T00:00:00.000Z	52 \| moderate	9.591 \| good	28.259 \| good	16.514 \| good	0.694 \| good	8.674 \| good	0.934 \| good
2026-03-07T01:00:00.000Z	56 \| moderate	11.88 \| good	30.569 \| good	22.619 \| good	0.717 \| good	9.803 \| good	0.792 \| good
2026-03-07T02:00:00.000Z	54 \| moderate	11.28 \| good	52.466 \| good	22.771 \| good	0.616 \| good	5.969 \| good	0.74 \| good
2026-03-07T03:00:00.000Z	56 \| moderate	12.152 \| fine	20.043 \| good	29.879 \| good	0.592 \| good	4.049 \| good	0.6 \| good
2026-03-07T04:00:00.000Z	44 \| good	8.013 \| good	14.929 \| good	29.223 \| good	0.588 \| good	3.815 \| good	0.55 \| good
2026-03-07T05:00:00.000Z	27 \| good	5.04 \| good	17.211 \| good	29.144 \| good	0.588 \| good	3.978 \| good	0.499 \| good
2026-03-07T06:00:00.000Z	58 \| moderate	13.334 \| fine	23.325 \| good	31.458 \| good	0.588 \| good	2.721 \| good	0.463 \| good
2026-03-07T07:00:00.000Z	44 \| good	7.76 \| good	19.693 \| good	26.109 \| good	0.662 \| good	4.278 \| good	0.016 \| good
2026-03-07T08:00:00.000Z	52 \| moderate	9.734 \| good	23.618 \| good	27.117 \| good	0.679 \| good	4.847 \| good	0.015 \| good
2026-03-07T09:00:00.000Z	52 \| moderate	9.925 \| good	19.102 \| good	22.702 \| good	0.675 \| good	7.481 \| good	0.013 \| good
2026-03-07T10:00:00.000Z	49 \| good	8.646 \| good	20.666 \| good	23.182 \| good	0.822 \| good	7.908 \| good	0.01 \| good
2026-03-07T11:00:00.000Z	44 \| good	8.359 \| good	15.548 \| good	22.359 \| good	0.764 \| good	5.588 \| good	0.008 \| good
2026-03-07T12:00:00.000Z	33 \| good	6.251 \| good	8.989 \| good	21.413 \| good	0.752 \| good	5.613 \| good	0.006 \| good
2026-03-07T13:00:00.000Z	38 \| good	7.276 \| good	10.01 \| good	26.891 \| good	0.759 \| good	6.581 \| good	0.005 \| good
2026-03-07T14:00:00.000Z	27 \| good	5.019 \| good	7.226 \| good	28.908 \| good	0.685 \| good	8.084 \| good	0.005 \| good
2026-03-07T15:00:00.000Z	27 \| good	4.81 \| good	8.155 \| good	28.114 \| good	0.834 \| good	9.007 \| good	0.005 \| good
2026-03-07T16:00:00.000Z	33 \| good	6.142 \| good	8.739 \| good	28.663 \| good	0.824 \| good	7.664 \| good	0.006 \| good
2026-03-07T17:00:00.000Z	27 \| good	5.287 \| good	8.726 \| good	26.433 \| good	0.773 \| good	6.683 \| good	0.008 \| good
2026-03-07T18:00:00.000Z	27 \| good	4.666 \| good	21.761 \| good	28.949 \| good	0.733 \| good	6.788 \| good	0.009 \| good
2026-03-07T19:00:00.000Z	38 \| good	7.28 \| good	9.8 \| good	31.392 \| good	0.76 \| good	6.974 \| good	0.011 \| good
2026-03-07T20:00:00.000Z	24 \| good	3.75 \| good	3.93 \| good	26.291 \| good	0.781 \| good	8.229 \| good	0.018 \| good
2026-03-07T21:00:00.000Z	23 \| good	3.44 \| good	9 \| good	25.233 \| good	0.861 \| good	11.1 \| good	0.025 \| good
2026-03-07T22:00:00.000Z	24 \| good	2.7 \| good	11.42 \| good	25.558 \| good	0.869 \| good	9.766 \| good	0.026 \| good
2026-03-07T23:00:00.000Z	33 \| good	5.98 \| good	10.401 \| good	28.245 \| good	0.707 \| good	8.231 \| good	0.029 \| good
2026-03-08T00:00:00.000Z	44 \| good	7.546 \| good	16.797 \| good	22.517 \| good	0.779 \| good	10.404 \| good	1.005 \| good
2026-03-08T01:00:00.000Z	44 \| good	7.546 \| good	16.797 \| good	22.517 \| good	0.779 \| good	10.404 \| good	1.005 \| good
2026-03-08T02:00:00.000Z	71 \| moderate	20.361 \| fine	31.173 \| good	16.527 \| good	0.843 \| good	10.532 \| good	0.187 \| good
2026-03-08T03:00:00.000Z	73 \| moderate	20.617 \| fine	33.533 \| good	17.402 \| good	0.713 \| good	8.682 \| good	0.18 \| good
2026-03-08T04:00:00.000Z	71 \| moderate	19.945 \| fine	34.556 \| good	18.237 \| good	0.656 \| good	7.524 \| good	0.174 \| good
2026-03-08T05:00:00.000Z	71 \| moderate	19.664 \| fine	35.55 \| good	19.19 \| good	0.65 \| good	6.245 \| good	0.172 \| good
2026-03-08T06:00:00.000Z	71 \| moderate	20.286 \| fine	40.346 \| good	20.073 \| good	0.619 \| good	6.184 \| good	0.175 \| good
2026-03-08T07:00:00.000Z	73 \| moderate	20.753 \| fine	41.735 \| good	18.942 \| good	0.762 \| good	7.799 \| good	0.182 \| good
2026-03-08T08:00:00.000Z	77 \| moderate	23.106 \| fine	43.749 \| good	18.358 \| good	0.901 \| good	9.455 \| good	0.194 \| good
2026-03-08T09:00:00.000Z	79 \| moderate	23.744 \| fine	45.697 \| good	17.262 \| good	1.001 \| good	9.683 \| good	0.202 \| good
2026-03-08T10:00:00.000Z	81 \| moderate	25.389 \| fine	43.744 \| good	17.634 \| good	1.038 \| good	9.949 \| good	0.211 \| good
2026-03-08T11:00:00.000Z	92 \| moderate	31.212 \| fine	41.453 \| good	16.689 \| good	1.053 \| good	10.758 \| good	0.222 \| good
2026-03-08T12:00:00.000Z	94 \| moderate	31.921 \| fine	43.055 \| good	15.406 \| good	1.127 \| good	11.754 \| good	0.231 \| good
2026-03-08T13:00:00.000Z	94 \| moderate	32.4 \| fine	46.385 \| good	17.95 \| good	1.212 \| good	12.871 \| good	0.255 \| good
2026-03-08T14:00:00.000Z	96 \| moderate	33.255 \| fine	46.809 \| good	18.465 \| good	1.307 \| good	14.472 \| good	0.264 \| good
2026-03-08T15:00:00.000Z	99 \| moderate	34.587 \| fine	50.152 \| good	19.26 \| good	1.383 \| good	14.182 \| good	0.262 \| good
2026-03-08T16:00:00.000Z	112 \| sensitive	39.747 \| moderate	50.801 \| good	19.144 \| good	1.468 \| good	15.7 \| good	0.277 \| good
2026-03-08T17:00:00.000Z	117 \| sensitive	41.87 \| moderate	52.959 \| good	17.918 \| good	1.571 \| good	19.588 \| good	0.307 \| good
2026-03-08T18:00:00.000Z	124 \| sensitive	44.699 \| moderate	56.46 \| fine	13.112 \| good	1.845 \| good	24.537 \| good	0.32 \| good
2026-03-08T19:00:00.000Z	132 \| sensitive	47.993 \| moderate	59.575 \| fine	6.713 \| good	1.909 \| good	29.215 \| good	0.334 \| good
2026-03-08T20:00:00.000Z	147 \| sensitive	54.146 \| moderate	66.197 \| fine	3.69 \| good	1.843 \| good	29.144 \| good	0.331 \| good
2026-03-08T21:00:00.000Z	151 \| unhealthy	55.657 \| poor	67.27 \| fine	2.624 \| good	1.78 \| good	29.454 \| good	0.333 \| good
2026-03-08T22:00:00.000Z	144 \| sensitive	52.679 \| moderate	62.488 \| fine	2.045 \| good	1.72 \| good	29.732 \| good	0.339 \| good
2026-03-08T23:00:00.000Z	144 \| sensitive	53.133 \| moderate	58.894 \| fine	1.616 \| good	1.704 \| good	29.767 \| good	0.336 \| good
2026-03-09T00:00:00.000Z	147 \| sensitive	54.319 \| moderate	58.891 \| fine	2.393 \| good	1.535 \| good	29.843 \| good	0.333 \| good
2026-03-09T01:00:00.000Z	149 \| sensitive	55.29 \| moderate	59.33 \| fine	3.256 \| good	1.413 \| good	28.077 \| good	0.332 \| good
2026-03-09T02:00:00.000Z	151 \| unhealthy	56.209 \| poor	60.245 \| fine	3.63 \| good	1.308 \| good	26.251 \| good	0.334 \| good
2026-03-09T03:00:00.000Z	152 \| unhealthy	56.772 \| poor	61.204 \| fine	3.157 \| good	1.206 \| good	24.681 \| good	0.339 \| good
2026-03-09T04:00:00.000Z	151 \| unhealthy	56.034 \| poor	60.88 \| fine	2.841 \| good	1.078 \| good	23.075 \| good	0.341 \| good
2026-03-09T05:00:00.000Z	144 \| sensitive	52.71 \| moderate	59.824 \| fine	2.853 \| good	1.11 \| good	21.382 \| good	0.343 \| good
2026-03-09T06:00:00.000Z	137 \| sensitive	50.083 \| moderate	56.342 \| fine	3.106 \| good	1.283 \| good	20.89 \| good	0.347 \| good
2026-03-09T07:00:00.000Z	129 \| sensitive	46.921 \| moderate	52.194 \| good	3.562 \| good	1.237 \| good	21.531 \| good	0.351 \| good
2026-03-09T08:00:00.000Z	127 \| sensitive	46.161 \| moderate	52.052 \| good	4.718 \| good	1.198 \| good	22.419 \| good	0.348 \| good
2026-03-09T09:00:00.000Z	132 \| sensitive	48.333 \| moderate	54.529 \| good	6.429 \| good	1.238 \| good	23.288 \| good	0.348 \| good
2026-03-09T10:00:00.000Z	132 \| sensitive	48.448 \| moderate	53.441 \| good	8.186 \| good	1.23 \| good	22.528 \| good	0.343 \| good
2026-03-09T11:00:00.000Z	107 \| sensitive	37.523 \| moderate	45.546 \| good	9.902 \| good	1.207 \| good	21.743 \| good	0.314 \| good
2026-03-09T12:00:00.000Z	97 \| moderate	34.166 \| fine	41.775 \| good	12.038 \| good	1.324 \| good	21.684 \| good	0.304 \| good
2026-03-09T13:00:00.000Z	90 \| moderate	29.747 \| fine	34.976 \| good	16.804 \| good	0.901 \| good	19.821 \| good	0.272 \| good
2026-03-09T14:00:00.000Z	84 \| moderate	26.654 \| fine	31.559 \| good	23.804 \| good	0.761 \| good	18.225 \| good	0.244 \| good
2026-03-09T15:00:00.000Z	82 \| moderate	26.469 \| fine	29.636 \| good	25.14 \| good	0.721 \| good	15.877 \| good	0.223 \| good
2026-03-09T16:00:00.000Z	79 \| moderate	24.061 \| fine	26.636 \| good	24.341 \| good	0.748 \| good	15.81 \| good	0.212 \| good
2026-03-09T17:00:00.000Z	75 \| moderate	22.318 \| fine	24.733 \| good	21.429 \| good	0.827 \| good	17.548 \| good	0.215 \| good
2026-03-09T18:00:00.000Z	75 \| moderate	21.545 \| fine	25.488 \| good	17.301 \| good	1.095 \| good	22.677 \| good	0.222 \| good
2026-03-09T19:00:00.000Z	73 \| moderate	21.473 \| fine	25.708 \| good	13.437 \| good	1.193 \| good	26.014 \| good	0.258 \| good
2026-03-09T20:00:00.000Z	71 \| moderate	19.796 \| fine	22.736 \| good	9.562 \| good	1.249 \| good	28.349 \| good	0.252 \| good
2026-03-09T21:00:00.000Z	71 \| moderate	19.644 \| fine	23.083 \| good	11.958 \| good	1.267 \| good	26.015 \| good	0.232 \| good
2026-03-09T22:00:00.000Z	77 \| moderate	22.777 \| fine	26.453 \| good	13.858 \| good	1.091 \| good	21.543 \| good	0.209 \| good
2026-03-09T23:00:00.000Z	79 \| moderate	23.759 \| fine	28.328 \| good	14.905 \| good	0.96 \| good	18.737 \| good	0.197 \| good
2026-03-10T00:00:00.000Z	75 \| moderate	22.214 \| fine	27.354 \| good	15.828 \| good	0.731 \| good	15.661 \| good	0.185 \| good
2026-03-10T01:00:00.000Z	77 \| moderate	22.855 \| fine	27.351 \| good	14.636 \| good	0.639 \| good	14.041 \| good	0.176 \| good

Real-time air quality index in Watford, Hertfordshire today

Common air pollutants in Watford, Hertfordshire

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Watford, Hertfordshire air quality forecast and history

Empower business decisions with accurate air quality data

Watford, Hertfordshire air quality map: Real-time AQI near you

Air quality in nearby cities

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How accurate is Hertfordshire, UK air quality data?

Air quality levels in UK

Frequently asked questions

How frequently is the air quality data for Watford, Hertfordshire updated?

When did Watford, Hertfordshire experience the worst air quality in the last 24 hours?

When did Watford, Hertfordshire have its best air quality in the last 24 hours?

What is the real-time air quality index for Watford, Hertfordshire?

Which pollutant is found most often in Watford, Hertfordshire?

What can I do if the air quality in Watford, Hertfordshire is poor?

What are the current PM2.5 levels in Watford, Hertfordshire?

What are the current PM10 levels at Watford, Hertfordshire?

What are the current carbon monoxide (CO) levels at Watford, Hertfordshire?

What are the current sulfur dioxide (SO2) levels at Watford, Hertfordshire?

What are the current ozone (O3) levels at Watford, Hertfordshire?

What are the current nitrogen dioxide (NO2) levels at Watford, Hertfordshire?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What are the current PM_2.5 levels in Watford, Hertfordshire?

What are the current PM₁₀ levels at Watford, Hertfordshire?

What are the current sulfur dioxide (SO₂) levels at Watford, Hertfordshire?

What are the current ozone (O₃) levels at Watford, Hertfordshire?

What are the current nitrogen dioxide (NO₂) levels at Watford, Hertfordshire?