What are the current PM10 levels at Watford, Hertfordshire?

The current PM10 levels in Watford, Hertfordshire are 23.677 μg/m3.

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

The current sulfur dioxide (SO2) levels in Watford, Hertfordshire are 0.428 ppb.

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

The current ozone (O3) levels at Watford, Hertfordshire is 39.997 ppm.

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

The current nitrogen dioxide (NO2) levels at Watford, Hertfordshire is 6.339 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 15.001 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)

Moderate

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)

15.00 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

23.68 μg/m³

155

255

425

605+

Ozone (O₃)

40.00 ppb

201

201+

Sulfur Dioxide (SO₂)

0.43 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

6.34 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.00 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

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
2026-07-16T10:00:00.000Z	58 \| moderate	12.778 \| fine	21.362 \| good	33.375 \| good	0.613 \| good	6.134 \| good	0.004 \| good
2026-07-16T11:00:00.000Z	58 \| moderate	13.367 \| fine	19.831 \| good	31.926 \| good	0.609 \| good	4.701 \| good	0.004 \| good
2026-07-16T12:00:00.000Z	56 \| moderate	11.707 \| good	24.957 \| good	31.791 \| good	0.731 \| good	4.478 \| good	0.004 \| good
2026-07-16T13:00:00.000Z	54 \| moderate	11.183 \| good	20.831 \| good	30.467 \| good	0.641 \| good	4.595 \| good	0.004 \| good
2026-07-16T14:00:00.000Z	58 \| moderate	12.746 \| fine	19.153 \| good	31.857 \| good	0.701 \| good	4.837 \| good	0.004 \| good
2026-07-16T15:00:00.000Z	56 \| moderate	12.281 \| fine	19.807 \| good	35 \| good	2.171 \| good	4.876 \| good	0.004 \| good
2026-07-16T16:00:00.000Z	56 \| moderate	11.547 \| good	18.688 \| good	40.812 \| good	1.28 \| good	5.13 \| good	0.004 \| good
2026-07-16T17:00:00.000Z	56 \| moderate	11.527 \| good	30.491 \| good	39.128 \| good	1.021 \| good	5.362 \| good	0.004 \| good
2026-07-16T18:00:00.000Z	56 \| moderate	11.599 \| good	42.941 \| good	35.794 \| good	0.792 \| good	5.326 \| good	0.004 \| good
2026-07-16T19:00:00.000Z	58 \| moderate	12.62 \| fine	22.147 \| good	36.628 \| good	0.66 \| good	6.4 \| good	0.005 \| good
2026-07-16T20:00:00.000Z	56 \| moderate	11.584 \| good	19.377 \| good	46.036 \| good	0.693 \| good	5.076 \| good	0.005 \| good
2026-07-16T21:00:00.000Z	56 \| moderate	11.553 \| good	19.353 \| good	45.797 \| good	0.548 \| good	5.415 \| good	0.005 \| good
2026-07-16T22:00:00.000Z	56 \| moderate	11.501 \| good	26.244 \| good	39.573 \| good	0.559 \| good	7.892 \| good	0.005 \| good
2026-07-16T23:00:00.000Z	54 \| moderate	11.359 \| good	28.163 \| good	32.181 \| good	0.639 \| good	5.792 \| good	0.005 \| good
2026-07-17T00:00:00.000Z	52 \| moderate	10.074 \| good	34.5 \| good	36.587 \| good	0.519 \| good	9.101 \| good	0.143 \| good
2026-07-17T01:00:00.000Z	54 \| moderate	11.445 \| good	22.89 \| good	37.536 \| good	0.579 \| good	11.316 \| good	0.144 \| good
2026-07-17T02:00:00.000Z	56 \| moderate	11.999 \| good	25.151 \| good	35.355 \| good	0.671 \| good	8.334 \| good	0.136 \| good
2026-07-17T03:00:00.000Z	56 \| moderate	12.05 \| good	23.176 \| good	31.015 \| good	0.611 \| good	8.375 \| good	0.13 \| good
2026-07-17T04:00:00.000Z	56 \| moderate	12.104 \| fine	23.397 \| good	30.151 \| good	0.502 \| good	8.532 \| good	0.13 \| good
2026-07-17T05:00:00.000Z	56 \| moderate	11.607 \| good	22.162 \| good	27.648 \| good	0.345 \| good	7.776 \| good	0.141 \| good
2026-07-17T06:00:00.000Z	49 \| good	9.389 \| good	28.568 \| good	29.06 \| good	0.317 \| good	8.205 \| good	0.007 \| good
2026-07-17T07:00:00.000Z	56 \| moderate	12.437 \| fine	20.941 \| good	28.492 \| good	0.318 \| good	12.07 \| good	0.007 \| good
2026-07-17T08:00:00.000Z	58 \| moderate	13.16 \| fine	29.2 \| good	27.67 \| good	0.338 \| good	13.576 \| good	0.007 \| good
2026-07-17T09:00:00.000Z	58 \| moderate	12.968 \| fine	25.695 \| good	28.395 \| good	0.467 \| good	9.276 \| good	0.006 \| good
2026-07-17T10:00:00.000Z	56 \| moderate	11.803 \| good	25.023 \| good	28.209 \| good	0.439 \| good	10.201 \| good	0.006 \| good
2026-07-17T11:00:00.000Z	56 \| moderate	12.436 \| fine	29.4 \| good	30.285 \| good	0.431 \| good	7.573 \| good	0.007 \| good
2026-07-17T12:00:00.000Z	58 \| moderate	12.724 \| fine	23.226 \| good	27.645 \| good	0.522 \| good	11.405 \| good	0.006 \| good
2026-07-17T13:00:00.000Z	56 \| moderate	11.836 \| good	23.524 \| good	30.726 \| good	0.418 \| good	11.705 \| good	0.006 \| good
2026-07-17T14:00:00.000Z	58 \| moderate	13.16 \| fine	20.508 \| good	35.938 \| good	0.416 \| good	12.401 \| good	0.006 \| good
2026-07-17T15:00:00.000Z	56 \| moderate	12.457 \| fine	29.4 \| good	34.179 \| good	0.416 \| good	14.263 \| good	0.007 \| good
2026-07-17T16:00:00.000Z	58 \| moderate	13.16 \| fine	25.865 \| good	32.896 \| good	0.415 \| good	10.9 \| good	0.006 \| good
2026-07-17T17:00:00.000Z	58 \| moderate	13.278 \| fine	28.064 \| good	41.649 \| good	0.42 \| good	14.606 \| good	0.007 \| good
2026-07-17T18:00:00.000Z	56 \| moderate	12.49 \| fine	23.315 \| good	41.023 \| good	0.423 \| good	8.272 \| good	0.008 \| good
2026-07-17T19:00:00.000Z	60 \| moderate	13.582 \| fine	23.571 \| good	49.548 \| good	0.507 \| good	14.427 \| good	0.008 \| good
2026-07-17T20:00:00.000Z	62 \| moderate	14.748 \| fine	23.497 \| good	47.725 \| good	0.478 \| good	10.059 \| good	0.009 \| good
2026-07-17T21:00:00.000Z	58 \| moderate	13.259 \| fine	26.399 \| good	51.192 \| good	0.403 \| good	9.879 \| good	0.009 \| good
2026-07-17T22:00:00.000Z	67 \| moderate	13.36 \| fine	34.055 \| good	60.137 \| fine	0.417 \| good	12.507 \| good	0.009 \| good
2026-07-17T23:00:00.000Z	58 \| moderate	13.36 \| fine	37.004 \| good	50.122 \| good	0.401 \| good	9.844 \| good	0.008 \| good
2026-07-18T00:00:00.000Z	64 \| moderate	12.789 \| fine	52.049 \| good	58.972 \| fine	0.382 \| good	6.337 \| good	0.176 \| good
2026-07-18T01:00:00.000Z	60 \| moderate	14.499 \| fine	36.865 \| good	46.097 \| good	0.464 \| good	6.619 \| good	0.164 \| good
2026-07-18T02:00:00.000Z	64 \| moderate	16.153 \| fine	21.719 \| good	47.372 \| good	0.425 \| good	6.719 \| good	0.141 \| good
2026-07-18T03:00:00.000Z	60 \| moderate	14.179 \| fine	23.403 \| good	44.32 \| good	0.442 \| good	6.88 \| good	0.16 \| good
2026-07-18T04:00:00.000Z	58 \| moderate	13.003 \| fine	22.567 \| good	42.62 \| good	0.419 \| good	6.318 \| good	0.153 \| good
2026-07-18T05:00:00.000Z	66 \| moderate	16.727 \| fine	35.12 \| good	40.111 \| good	0.449 \| good	6.733 \| good	0.004 \| good
2026-07-18T06:00:00.000Z	64 \| moderate	15.602 \| fine	23.083 \| good	36.728 \| good	0.434 \| good	7.732 \| good	0.002 \| good
2026-07-18T07:00:00.000Z	62 \| moderate	14.902 \| fine	34.729 \| good	37.592 \| good	0.407 \| good	8.381 \| good	0.003 \| good
2026-07-18T08:00:00.000Z	62 \| moderate	15.001 \| fine	23.677 \| good	39.997 \| good	0.428 \| good	6.339 \| good	0.003 \| good
2026-07-18T09:00:00.000Z	64 \| moderate	15.804 \| fine	23.757 \| good	39.122 \| good	0.412 \| good	7.066 \| good	0.002 \| good
2026-07-18T09:00:00.000Z	62 \| moderate	15.001 \| fine	23.677 \| good	39.997 \| good	0.428 \| good	6.339 \| good	0.003 \| good
2026-07-18T10:00:00.000Z	38 \| good	7.313 \| good	11.664 \| good	40.036 \| good	0.273 \| good	1.385 \| good	0.113 \| good
2026-07-18T11:00:00.000Z	40 \| good	6.718 \| good	10.86 \| good	42.881 \| good	0.267 \| good	1.187 \| good	0.112 \| good
2026-07-18T12:00:00.000Z	42 \| good	6.67 \| good	10.346 \| good	44.589 \| good	0.259 \| good	1.096 \| good	0.111 \| good
2026-07-18T13:00:00.000Z	43 \| good	6.567 \| good	9.79 \| good	45.643 \| good	0.242 \| good	1.021 \| good	0.111 \| good
2026-07-18T14:00:00.000Z	43 \| good	6.472 \| good	9.574 \| good	45.962 \| good	0.189 \| good	1.022 \| good	0.111 \| good
2026-07-18T15:00:00.000Z	42 \| good	6.468 \| good	9.649 \| good	45.046 \| good	0.17 \| good	1.157 \| good	0.113 \| good
2026-07-18T16:00:00.000Z	41 \| good	6.411 \| good	9.647 \| good	43.826 \| good	0.175 \| good	1.358 \| good	0.115 \| good
2026-07-18T17:00:00.000Z	39 \| good	6.055 \| good	8.752 \| good	41.994 \| good	0.186 \| good	1.517 \| good	0.116 \| good
2026-07-18T18:00:00.000Z	37 \| good	5.638 \| good	8.063 \| good	40.217 \| good	0.212 \| good	1.643 \| good	0.115 \| good
2026-07-18T19:00:00.000Z	35 \| good	5.42 \| good	8.587 \| good	38.283 \| good	0.226 \| good	1.861 \| good	0.113 \| good
2026-07-18T20:00:00.000Z	34 \| good	5.354 \| good	9.942 \| good	36.765 \| good	0.224 \| good	2.015 \| good	0.11 \| good
2026-07-18T21:00:00.000Z	31 \| good	5.313 \| good	10.648 \| good	33.738 \| good	0.217 \| good	2.335 \| good	0.109 \| good
2026-07-18T22:00:00.000Z	31 \| good	5.248 \| good	10.846 \| good	32.773 \| good	0.228 \| good	2.374 \| good	0.109 \| good
2026-07-18T23:00:00.000Z	30 \| good	5.168 \| good	10.754 \| good	31.678 \| good	0.23 \| good	2.483 \| good	0.11 \| good
2026-07-19T00:00:00.000Z	28 \| good	5.058 \| good	10.68 \| good	30.027 \| good	0.211 \| good	2.532 \| good	0.109 \| good
2026-07-19T01:00:00.000Z	28 \| good	4.921 \| good	10.019 \| good	29.872 \| good	0.217 \| good	2.304 \| good	0.109 \| good
2026-07-19T02:00:00.000Z	27 \| good	4.73 \| good	9.605 \| good	28.602 \| good	0.25 \| good	2.304 \| good	0.109 \| good
2026-07-19T03:00:00.000Z	25 \| good	4.496 \| good	9.51 \| good	27.02 \| good	0.292 \| good	2.397 \| good	0.109 \| good
2026-07-19T04:00:00.000Z	25 \| good	4.415 \| good	9.367 \| good	26.882 \| good	0.244 \| good	2.29 \| good	0.108 \| good
2026-07-19T05:00:00.000Z	24 \| good	4.432 \| good	10.42 \| good	26.496 \| good	0.257 \| good	2.163 \| good	0.108 \| good
2026-07-19T06:00:00.000Z	27 \| good	4.657 \| good	10.629 \| good	27.421 \| good	0.231 \| good	1.597 \| good	0.107 \| good
2026-07-19T07:00:00.000Z	27 \| good	4.83 \| good	11.653 \| good	28.189 \| good	0.223 \| good	1.346 \| good	0.108 \| good
2026-07-19T08:00:00.000Z	29 \| good	4.966 \| good	12.442 \| good	31.025 \| good	0.216 \| good	1.156 \| good	0.107 \| good
2026-07-19T09:00:00.000Z	31 \| good	4.82 \| good	11.008 \| good	33.142 \| good	0.198 \| good	1.002 \| good	0.105 \| good
2026-07-19T10:00:00.000Z	32 \| good	4.403 \| good	9.043 \| good	34.923 \| good	0.186 \| good	0.877 \| good	0.104 \| good
2026-07-19T11:00:00.000Z	34 \| good	4.239 \| good	8.186 \| good	36.726 \| good	0.169 \| good	0.846 \| good	0.104 \| good
2026-07-19T12:00:00.000Z	35 \| good	4.238 \| good	7.846 \| good	37.866 \| good	0.157 \| good	0.889 \| good	0.102 \| good
2026-07-19T13:00:00.000Z	37 \| good	4.279 \| good	8.094 \| good	39.676 \| good	0.153 \| good	0.902 \| good	0.101 \| good
2026-07-19T14:00:00.000Z	37 \| good	4.336 \| good	7.89 \| good	40.466 \| good	0.143 \| good	0.904 \| good	0.101 \| good
2026-07-19T15:00:00.000Z	37 \| good	4.383 \| good	7.752 \| good	40.335 \| good	0.143 \| good	0.937 \| good	0.1 \| good
2026-07-19T16:00:00.000Z	38 \| good	4.493 \| good	7.46 \| good	40.595 \| good	0.146 \| good	0.97 \| good	0.101 \| good
2026-07-19T17:00:00.000Z	37 \| good	4.586 \| good	7.23 \| good	40.356 \| good	0.153 \| good	1.164 \| good	0.101 \| good
2026-07-19T18:00:00.000Z	37 \| good	4.479 \| good	7.116 \| good	39.785 \| good	0.164 \| good	1.322 \| good	0.102 \| good
2026-07-19T19:00:00.000Z	35 \| good	4.409 \| good	6.835 \| good	38.216 \| good	0.183 \| good	1.593 \| good	0.1 \| good
2026-07-19T20:00:00.000Z	33 \| good	4.577 \| good	8.368 \| good	36.201 \| good	0.26 \| good	2.181 \| good	0.099 \| good
2026-07-19T21:00:00.000Z	30 \| good	4.84 \| good	9.357 \| good	31.767 \| good	0.254 \| good	2.749 \| good	0.099 \| good
2026-07-19T22:00:00.000Z	27 \| good	5.246 \| good	10.014 \| good	28.305 \| good	0.258 \| good	3.091 \| good	0.1 \| good
2026-07-19T23:00:00.000Z	27 \| good	5.41 \| good	11.03 \| good	26.886 \| good	0.251 \| good	3.262 \| good	0.1 \| good
2026-07-20T00:00:00.000Z	33 \| good	5.711 \| good	11.107 \| good	26.167 \| good	0.24 \| good	3.517 \| good	0.1 \| good
2026-07-20T01:00:00.000Z	33 \| good	5.916 \| good	11.522 \| good	25.367 \| good	0.254 \| good	3.789 \| good	0.101 \| good
2026-07-20T02:00:00.000Z	33 \| good	5.912 \| good	12.381 \| good	23.448 \| good	0.268 \| good	4.031 \| good	0.1 \| good
2026-07-20T03:00:00.000Z	33 \| good	5.922 \| good	12.851 \| good	22.468 \| good	0.29 \| good	4.404 \| good	0.102 \| good
2026-07-20T04:00:00.000Z	33 \| good	5.978 \| good	12.477 \| good	21.695 \| good	0.323 \| good	4.845 \| good	0.104 \| good
2026-07-20T05:00:00.000Z	33 \| good	5.77 \| good	12.167 \| good	22.807 \| good	0.384 \| good	4.663 \| good	0.106 \| good
2026-07-20T06:00:00.000Z	27 \| good	5.42 \| good	10.899 \| good	23.328 \| good	0.396 \| good	4.563 \| good	0.106 \| good
2026-07-20T07:00:00.000Z	27 \| good	5.215 \| good	9.869 \| good	26.735 \| good	0.402 \| good	3.796 \| good	0.106 \| good
2026-07-20T08:00:00.000Z	27 \| good	4.663 \| good	8.038 \| good	29.018 \| good	0.329 \| good	3.146 \| good	0.105 \| good
2026-07-20T09:00:00.000Z	29 \| good	4.297 \| good	7.229 \| good	30.922 \| good	0.294 \| good	2.442 \| good	0.104 \| good

Watford

Empower business decisions with accurate air quality data

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

0.00ppm

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 10:00:00 on 2026-07-17.

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

The best air quality in Watford, Hertfordshire was recorded at 06:00:00 on 2026-07-17.

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

The real-time air quality index in Watford, Hertfordshire is 62, currently categorized as Moderate.

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 15.001 μg/m³.

What are the current PM₁₀ levels at Watford, Hertfordshire?

The current PM₁₀ levels in Watford, Hertfordshire are 23.677 μg/m³.

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

The current carbon monoxide (CO) level in Watford, Hertfordshire is 0.003 ppm.

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

The current sulfur dioxide (SO₂) levels in Watford, Hertfordshire are 0.428 ppb.

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

The current ozone (O₃) levels at Watford, Hertfordshire is 39.997 ppm.

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

The current nitrogen dioxide (NO₂) levels at Watford, Hertfordshire is 6.339 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-16T10:00:00.000Z	58 \| moderate	12.778 \| fine	21.362 \| good	33.375 \| good	0.613 \| good	6.134 \| good	0.004 \| good
2026-07-16T11:00:00.000Z	58 \| moderate	13.367 \| fine	19.831 \| good	31.926 \| good	0.609 \| good	4.701 \| good	0.004 \| good
2026-07-16T12:00:00.000Z	56 \| moderate	11.707 \| good	24.957 \| good	31.791 \| good	0.731 \| good	4.478 \| good	0.004 \| good
2026-07-16T13:00:00.000Z	54 \| moderate	11.183 \| good	20.831 \| good	30.467 \| good	0.641 \| good	4.595 \| good	0.004 \| good
2026-07-16T14:00:00.000Z	58 \| moderate	12.746 \| fine	19.153 \| good	31.857 \| good	0.701 \| good	4.837 \| good	0.004 \| good
2026-07-16T15:00:00.000Z	56 \| moderate	12.281 \| fine	19.807 \| good	35 \| good	2.171 \| good	4.876 \| good	0.004 \| good
2026-07-16T16:00:00.000Z	56 \| moderate	11.547 \| good	18.688 \| good	40.812 \| good	1.28 \| good	5.13 \| good	0.004 \| good
2026-07-16T17:00:00.000Z	56 \| moderate	11.527 \| good	30.491 \| good	39.128 \| good	1.021 \| good	5.362 \| good	0.004 \| good
2026-07-16T18:00:00.000Z	56 \| moderate	11.599 \| good	42.941 \| good	35.794 \| good	0.792 \| good	5.326 \| good	0.004 \| good
2026-07-16T19:00:00.000Z	58 \| moderate	12.62 \| fine	22.147 \| good	36.628 \| good	0.66 \| good	6.4 \| good	0.005 \| good
2026-07-16T20:00:00.000Z	56 \| moderate	11.584 \| good	19.377 \| good	46.036 \| good	0.693 \| good	5.076 \| good	0.005 \| good
2026-07-16T21:00:00.000Z	56 \| moderate	11.553 \| good	19.353 \| good	45.797 \| good	0.548 \| good	5.415 \| good	0.005 \| good
2026-07-16T22:00:00.000Z	56 \| moderate	11.501 \| good	26.244 \| good	39.573 \| good	0.559 \| good	7.892 \| good	0.005 \| good
2026-07-16T23:00:00.000Z	54 \| moderate	11.359 \| good	28.163 \| good	32.181 \| good	0.639 \| good	5.792 \| good	0.005 \| good
2026-07-17T00:00:00.000Z	52 \| moderate	10.074 \| good	34.5 \| good	36.587 \| good	0.519 \| good	9.101 \| good	0.143 \| good
2026-07-17T01:00:00.000Z	54 \| moderate	11.445 \| good	22.89 \| good	37.536 \| good	0.579 \| good	11.316 \| good	0.144 \| good
2026-07-17T02:00:00.000Z	56 \| moderate	11.999 \| good	25.151 \| good	35.355 \| good	0.671 \| good	8.334 \| good	0.136 \| good
2026-07-17T03:00:00.000Z	56 \| moderate	12.05 \| good	23.176 \| good	31.015 \| good	0.611 \| good	8.375 \| good	0.13 \| good
2026-07-17T04:00:00.000Z	56 \| moderate	12.104 \| fine	23.397 \| good	30.151 \| good	0.502 \| good	8.532 \| good	0.13 \| good
2026-07-17T05:00:00.000Z	56 \| moderate	11.607 \| good	22.162 \| good	27.648 \| good	0.345 \| good	7.776 \| good	0.141 \| good
2026-07-17T06:00:00.000Z	49 \| good	9.389 \| good	28.568 \| good	29.06 \| good	0.317 \| good	8.205 \| good	0.007 \| good
2026-07-17T07:00:00.000Z	56 \| moderate	12.437 \| fine	20.941 \| good	28.492 \| good	0.318 \| good	12.07 \| good	0.007 \| good
2026-07-17T08:00:00.000Z	58 \| moderate	13.16 \| fine	29.2 \| good	27.67 \| good	0.338 \| good	13.576 \| good	0.007 \| good
2026-07-17T09:00:00.000Z	58 \| moderate	12.968 \| fine	25.695 \| good	28.395 \| good	0.467 \| good	9.276 \| good	0.006 \| good
2026-07-17T10:00:00.000Z	56 \| moderate	11.803 \| good	25.023 \| good	28.209 \| good	0.439 \| good	10.201 \| good	0.006 \| good
2026-07-17T11:00:00.000Z	56 \| moderate	12.436 \| fine	29.4 \| good	30.285 \| good	0.431 \| good	7.573 \| good	0.007 \| good
2026-07-17T12:00:00.000Z	58 \| moderate	12.724 \| fine	23.226 \| good	27.645 \| good	0.522 \| good	11.405 \| good	0.006 \| good
2026-07-17T13:00:00.000Z	56 \| moderate	11.836 \| good	23.524 \| good	30.726 \| good	0.418 \| good	11.705 \| good	0.006 \| good
2026-07-17T14:00:00.000Z	58 \| moderate	13.16 \| fine	20.508 \| good	35.938 \| good	0.416 \| good	12.401 \| good	0.006 \| good
2026-07-17T15:00:00.000Z	56 \| moderate	12.457 \| fine	29.4 \| good	34.179 \| good	0.416 \| good	14.263 \| good	0.007 \| good
2026-07-17T16:00:00.000Z	58 \| moderate	13.16 \| fine	25.865 \| good	32.896 \| good	0.415 \| good	10.9 \| good	0.006 \| good
2026-07-17T17:00:00.000Z	58 \| moderate	13.278 \| fine	28.064 \| good	41.649 \| good	0.42 \| good	14.606 \| good	0.007 \| good
2026-07-17T18:00:00.000Z	56 \| moderate	12.49 \| fine	23.315 \| good	41.023 \| good	0.423 \| good	8.272 \| good	0.008 \| good
2026-07-17T19:00:00.000Z	60 \| moderate	13.582 \| fine	23.571 \| good	49.548 \| good	0.507 \| good	14.427 \| good	0.008 \| good
2026-07-17T20:00:00.000Z	62 \| moderate	14.748 \| fine	23.497 \| good	47.725 \| good	0.478 \| good	10.059 \| good	0.009 \| good
2026-07-17T21:00:00.000Z	58 \| moderate	13.259 \| fine	26.399 \| good	51.192 \| good	0.403 \| good	9.879 \| good	0.009 \| good
2026-07-17T22:00:00.000Z	67 \| moderate	13.36 \| fine	34.055 \| good	60.137 \| fine	0.417 \| good	12.507 \| good	0.009 \| good
2026-07-17T23:00:00.000Z	58 \| moderate	13.36 \| fine	37.004 \| good	50.122 \| good	0.401 \| good	9.844 \| good	0.008 \| good
2026-07-18T00:00:00.000Z	64 \| moderate	12.789 \| fine	52.049 \| good	58.972 \| fine	0.382 \| good	6.337 \| good	0.176 \| good
2026-07-18T01:00:00.000Z	60 \| moderate	14.499 \| fine	36.865 \| good	46.097 \| good	0.464 \| good	6.619 \| good	0.164 \| good
2026-07-18T02:00:00.000Z	64 \| moderate	16.153 \| fine	21.719 \| good	47.372 \| good	0.425 \| good	6.719 \| good	0.141 \| good
2026-07-18T03:00:00.000Z	60 \| moderate	14.179 \| fine	23.403 \| good	44.32 \| good	0.442 \| good	6.88 \| good	0.16 \| good
2026-07-18T04:00:00.000Z	58 \| moderate	13.003 \| fine	22.567 \| good	42.62 \| good	0.419 \| good	6.318 \| good	0.153 \| good
2026-07-18T05:00:00.000Z	66 \| moderate	16.727 \| fine	35.12 \| good	40.111 \| good	0.449 \| good	6.733 \| good	0.004 \| good
2026-07-18T06:00:00.000Z	64 \| moderate	15.602 \| fine	23.083 \| good	36.728 \| good	0.434 \| good	7.732 \| good	0.002 \| good
2026-07-18T07:00:00.000Z	62 \| moderate	14.902 \| fine	34.729 \| good	37.592 \| good	0.407 \| good	8.381 \| good	0.003 \| good
2026-07-18T08:00:00.000Z	62 \| moderate	15.001 \| fine	23.677 \| good	39.997 \| good	0.428 \| good	6.339 \| good	0.003 \| good
2026-07-18T09:00:00.000Z	64 \| moderate	15.804 \| fine	23.757 \| good	39.122 \| good	0.412 \| good	7.066 \| good	0.002 \| good
2026-07-18T09:00:00.000Z	62 \| moderate	15.001 \| fine	23.677 \| good	39.997 \| good	0.428 \| good	6.339 \| good	0.003 \| good
2026-07-18T10:00:00.000Z	38 \| good	7.313 \| good	11.664 \| good	40.036 \| good	0.273 \| good	1.385 \| good	0.113 \| good
2026-07-18T11:00:00.000Z	40 \| good	6.718 \| good	10.86 \| good	42.881 \| good	0.267 \| good	1.187 \| good	0.112 \| good
2026-07-18T12:00:00.000Z	42 \| good	6.67 \| good	10.346 \| good	44.589 \| good	0.259 \| good	1.096 \| good	0.111 \| good
2026-07-18T13:00:00.000Z	43 \| good	6.567 \| good	9.79 \| good	45.643 \| good	0.242 \| good	1.021 \| good	0.111 \| good
2026-07-18T14:00:00.000Z	43 \| good	6.472 \| good	9.574 \| good	45.962 \| good	0.189 \| good	1.022 \| good	0.111 \| good
2026-07-18T15:00:00.000Z	42 \| good	6.468 \| good	9.649 \| good	45.046 \| good	0.17 \| good	1.157 \| good	0.113 \| good
2026-07-18T16:00:00.000Z	41 \| good	6.411 \| good	9.647 \| good	43.826 \| good	0.175 \| good	1.358 \| good	0.115 \| good
2026-07-18T17:00:00.000Z	39 \| good	6.055 \| good	8.752 \| good	41.994 \| good	0.186 \| good	1.517 \| good	0.116 \| good
2026-07-18T18:00:00.000Z	37 \| good	5.638 \| good	8.063 \| good	40.217 \| good	0.212 \| good	1.643 \| good	0.115 \| good
2026-07-18T19:00:00.000Z	35 \| good	5.42 \| good	8.587 \| good	38.283 \| good	0.226 \| good	1.861 \| good	0.113 \| good
2026-07-18T20:00:00.000Z	34 \| good	5.354 \| good	9.942 \| good	36.765 \| good	0.224 \| good	2.015 \| good	0.11 \| good
2026-07-18T21:00:00.000Z	31 \| good	5.313 \| good	10.648 \| good	33.738 \| good	0.217 \| good	2.335 \| good	0.109 \| good
2026-07-18T22:00:00.000Z	31 \| good	5.248 \| good	10.846 \| good	32.773 \| good	0.228 \| good	2.374 \| good	0.109 \| good
2026-07-18T23:00:00.000Z	30 \| good	5.168 \| good	10.754 \| good	31.678 \| good	0.23 \| good	2.483 \| good	0.11 \| good
2026-07-19T00:00:00.000Z	28 \| good	5.058 \| good	10.68 \| good	30.027 \| good	0.211 \| good	2.532 \| good	0.109 \| good
2026-07-19T01:00:00.000Z	28 \| good	4.921 \| good	10.019 \| good	29.872 \| good	0.217 \| good	2.304 \| good	0.109 \| good
2026-07-19T02:00:00.000Z	27 \| good	4.73 \| good	9.605 \| good	28.602 \| good	0.25 \| good	2.304 \| good	0.109 \| good
2026-07-19T03:00:00.000Z	25 \| good	4.496 \| good	9.51 \| good	27.02 \| good	0.292 \| good	2.397 \| good	0.109 \| good
2026-07-19T04:00:00.000Z	25 \| good	4.415 \| good	9.367 \| good	26.882 \| good	0.244 \| good	2.29 \| good	0.108 \| good
2026-07-19T05:00:00.000Z	24 \| good	4.432 \| good	10.42 \| good	26.496 \| good	0.257 \| good	2.163 \| good	0.108 \| good
2026-07-19T06:00:00.000Z	27 \| good	4.657 \| good	10.629 \| good	27.421 \| good	0.231 \| good	1.597 \| good	0.107 \| good
2026-07-19T07:00:00.000Z	27 \| good	4.83 \| good	11.653 \| good	28.189 \| good	0.223 \| good	1.346 \| good	0.108 \| good
2026-07-19T08:00:00.000Z	29 \| good	4.966 \| good	12.442 \| good	31.025 \| good	0.216 \| good	1.156 \| good	0.107 \| good
2026-07-19T09:00:00.000Z	31 \| good	4.82 \| good	11.008 \| good	33.142 \| good	0.198 \| good	1.002 \| good	0.105 \| good
2026-07-19T10:00:00.000Z	32 \| good	4.403 \| good	9.043 \| good	34.923 \| good	0.186 \| good	0.877 \| good	0.104 \| good
2026-07-19T11:00:00.000Z	34 \| good	4.239 \| good	8.186 \| good	36.726 \| good	0.169 \| good	0.846 \| good	0.104 \| good
2026-07-19T12:00:00.000Z	35 \| good	4.238 \| good	7.846 \| good	37.866 \| good	0.157 \| good	0.889 \| good	0.102 \| good
2026-07-19T13:00:00.000Z	37 \| good	4.279 \| good	8.094 \| good	39.676 \| good	0.153 \| good	0.902 \| good	0.101 \| good
2026-07-19T14:00:00.000Z	37 \| good	4.336 \| good	7.89 \| good	40.466 \| good	0.143 \| good	0.904 \| good	0.101 \| good
2026-07-19T15:00:00.000Z	37 \| good	4.383 \| good	7.752 \| good	40.335 \| good	0.143 \| good	0.937 \| good	0.1 \| good
2026-07-19T16:00:00.000Z	38 \| good	4.493 \| good	7.46 \| good	40.595 \| good	0.146 \| good	0.97 \| good	0.101 \| good
2026-07-19T17:00:00.000Z	37 \| good	4.586 \| good	7.23 \| good	40.356 \| good	0.153 \| good	1.164 \| good	0.101 \| good
2026-07-19T18:00:00.000Z	37 \| good	4.479 \| good	7.116 \| good	39.785 \| good	0.164 \| good	1.322 \| good	0.102 \| good
2026-07-19T19:00:00.000Z	35 \| good	4.409 \| good	6.835 \| good	38.216 \| good	0.183 \| good	1.593 \| good	0.1 \| good
2026-07-19T20:00:00.000Z	33 \| good	4.577 \| good	8.368 \| good	36.201 \| good	0.26 \| good	2.181 \| good	0.099 \| good
2026-07-19T21:00:00.000Z	30 \| good	4.84 \| good	9.357 \| good	31.767 \| good	0.254 \| good	2.749 \| good	0.099 \| good
2026-07-19T22:00:00.000Z	27 \| good	5.246 \| good	10.014 \| good	28.305 \| good	0.258 \| good	3.091 \| good	0.1 \| good
2026-07-19T23:00:00.000Z	27 \| good	5.41 \| good	11.03 \| good	26.886 \| good	0.251 \| good	3.262 \| good	0.1 \| good
2026-07-20T00:00:00.000Z	33 \| good	5.711 \| good	11.107 \| good	26.167 \| good	0.24 \| good	3.517 \| good	0.1 \| good
2026-07-20T01:00:00.000Z	33 \| good	5.916 \| good	11.522 \| good	25.367 \| good	0.254 \| good	3.789 \| good	0.101 \| good
2026-07-20T02:00:00.000Z	33 \| good	5.912 \| good	12.381 \| good	23.448 \| good	0.268 \| good	4.031 \| good	0.1 \| good
2026-07-20T03:00:00.000Z	33 \| good	5.922 \| good	12.851 \| good	22.468 \| good	0.29 \| good	4.404 \| good	0.102 \| good
2026-07-20T04:00:00.000Z	33 \| good	5.978 \| good	12.477 \| good	21.695 \| good	0.323 \| good	4.845 \| good	0.104 \| good
2026-07-20T05:00:00.000Z	33 \| good	5.77 \| good	12.167 \| good	22.807 \| good	0.384 \| good	4.663 \| good	0.106 \| good
2026-07-20T06:00:00.000Z	27 \| good	5.42 \| good	10.899 \| good	23.328 \| good	0.396 \| good	4.563 \| good	0.106 \| good
2026-07-20T07:00:00.000Z	27 \| good	5.215 \| good	9.869 \| good	26.735 \| good	0.402 \| good	3.796 \| good	0.106 \| good
2026-07-20T08:00:00.000Z	27 \| good	4.663 \| good	8.038 \| good	29.018 \| good	0.329 \| good	3.146 \| good	0.105 \| good
2026-07-20T09:00:00.000Z	29 \| good	4.297 \| good	7.229 \| good	30.922 \| good	0.294 \| good	2.442 \| good	0.104 \| 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?