What are the current PM10 levels at Watford, Hertfordshire?

The current PM10 levels in Watford, Hertfordshire are 12.645 μg/m3.

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

The current sulfur dioxide (SO2) levels in Watford, Hertfordshire are 0.592 ppb.

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

The current ozone (O3) levels at Watford, Hertfordshire is 32.626 ppm.

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

The current nitrogen dioxide (NO2) levels at Watford, Hertfordshire is 7.681 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 4.021 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)

4.02 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

12.64 μg/m³

155

255

425

605+

Ozone (O₃)

32.63 ppb

201

201+

Sulfur Dioxide (SO₂)

0.59 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

7.68 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.31 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
2026-09-26T23:00:00.000Z	38 \| good	6.618 \| good	17.715 \| good	27.205 \| good	0.636 \| good	13.108 \| good	0.297 \| good
2026-09-27T00:00:00.000Z	44 \| good	8.178 \| good	22.629 \| good	22.723 \| good	0.733 \| good	22.322 \| good	0.226 \| good
2026-09-27T01:00:00.000Z	52 \| moderate	10.051 \| good	23.913 \| good	24.565 \| good	0.754 \| good	18.873 \| good	0.229 \| good
2026-09-27T02:00:00.000Z	52 \| moderate	10.279 \| good	24.255 \| good	21.274 \| good	0.68 \| good	17.301 \| good	0.212 \| good
2026-09-27T03:00:00.000Z	52 \| moderate	10.322 \| good	24.811 \| good	19.548 \| good	0.717 \| good	16.801 \| good	0.217 \| good
2026-09-27T04:00:00.000Z	52 \| moderate	10.322 \| good	24.811 \| good	19.862 \| good	0.692 \| good	17.041 \| good	0.205 \| good
2026-09-27T05:00:00.000Z	52 \| moderate	10.496 \| good	26.009 \| good	22.438 \| good	0.679 \| good	16.019 \| good	0.001 \| good
2026-09-27T06:00:00.000Z	52 \| moderate	10.496 \| good	26.411 \| good	25.107 \| good	0.655 \| good	14.369 \| good	0.001 \| good
2026-09-27T07:00:00.000Z	52 \| moderate	10.496 \| good	26.411 \| good	27.509 \| good	0.655 \| good	14.797 \| good	0.001 \| good
2026-09-27T08:00:00.000Z	54 \| moderate	10.787 \| good	25.996 \| good	25.348 \| good	0.653 \| good	14.095 \| good	0.001 \| good
2026-09-27T09:00:00.000Z	54 \| moderate	10.76 \| good	25.858 \| good	23.893 \| good	0.625 \| good	13.24 \| good	0.001 \| good
2026-09-27T10:00:00.000Z	54 \| moderate	10.663 \| good	25.444 \| good	24.766 \| good	0.628 \| good	12.11 \| good	0.002 \| good
2026-09-27T11:00:00.000Z	54 \| moderate	10.622 \| good	25.306 \| good	27.014 \| good	0.679 \| good	10.919 \| good	0.001 \| good
2026-09-27T12:00:00.000Z	54 \| moderate	10.594 \| good	25.57 \| good	24.619 \| good	0.705 \| good	10.217 \| good	0.001 \| good
2026-09-27T13:00:00.000Z	54 \| moderate	10.594 \| good	25.57 \| good	28.652 \| good	0.706 \| good	10.157 \| good	0.001 \| good
2026-09-27T14:00:00.000Z	54 \| moderate	11.024 \| good	25.708 \| good	28.332 \| good	0.705 \| good	9.822 \| good	0.001 \| good
2026-09-27T15:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	28.97 \| good	0.705 \| good	9.608 \| good	0.001 \| good
2026-09-27T16:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	31.763 \| good	0.679 \| good	9.608 \| good	0.001 \| good
2026-09-27T17:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	33.685 \| good	0.706 \| good	9.882 \| good	0.001 \| good
2026-09-27T18:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	33.02 \| good	0.679 \| good	9.882 \| good	0.002 \| good
2026-09-27T19:00:00.000Z	54 \| moderate	11.277 \| good	24.801 \| good	34.516 \| good	0.677 \| good	11.498 \| good	0.003 \| good
2026-09-27T20:00:00.000Z	54 \| moderate	10.996 \| good	25.972 \| good	32.374 \| good	0.653 \| good	11.073 \| good	0.002 \| good
2026-09-27T21:00:00.000Z	54 \| moderate	10.567 \| good	25.03 \| good	33.352 \| good	0.655 \| good	11.073 \| good	0.002 \| good
2026-09-27T22:00:00.000Z	52 \| moderate	9.763 \| good	24.226 \| good	29.638 \| good	0.501 \| good	10.399 \| good	0.002 \| good
2026-09-27T23:00:00.000Z	49 \| good	9.319 \| good	23.686 \| good	30.813 \| good	0.654 \| good	10.732 \| good	0.002 \| good
2026-09-28T00:00:00.000Z	38 \| good	6.782 \| good	16.753 \| good	30.863 \| good	0.722 \| good	6.184 \| good	0.255 \| good
2026-09-28T01:00:00.000Z	38 \| good	7.355 \| good	13.103 \| good	29.517 \| good	0.747 \| good	5.86 \| good	0.18 \| good
2026-09-28T02:00:00.000Z	38 \| good	7.469 \| good	13.445 \| good	28.077 \| good	0.689 \| good	4.968 \| good	0.226 \| good
2026-09-28T03:00:00.000Z	38 \| good	7.44 \| good	13.304 \| good	27.892 \| good	0.748 \| good	5.534 \| good	0.214 \| good
2026-09-28T04:00:00.000Z	38 \| good	7.027 \| good	13.304 \| good	27.077 \| good	0.751 \| good	7.376 \| good	0.217 \| good
2026-09-28T05:00:00.000Z	33 \| good	6.281 \| good	12.092 \| good	27.526 \| good	0.653 \| good	7.021 \| good	0.197 \| good
2026-09-28T06:00:00.000Z	33 \| good	6.239 \| good	11.954 \| good	26.864 \| good	0.653 \| good	6.319 \| good	0.21 \| good
2026-09-28T07:00:00.000Z	33 \| good	5.879 \| good	11.69 \| good	22.244 \| good	0.651 \| good	6.96 \| good	0.279 \| good
2026-09-28T08:00:00.000Z	33 \| good	5.907 \| good	11.828 \| good	25.76 \| good	0.65 \| good	8.607 \| good	0.264 \| good
2026-09-28T09:00:00.000Z	33 \| good	5.948 \| good	12.104 \| good	21.488 \| good	0.679 \| good	11.391 \| good	0.235 \| good
2026-09-28T10:00:00.000Z	33 \| good	5.976 \| good	12.242 \| good	23.576 \| good	0.679 \| good	9.136 \| good	0.221 \| good
2026-09-28T11:00:00.000Z	33 \| good	5.601 \| good	11.979 \| good	19.688 \| good	0.705 \| good	8.193 \| good	0.212 \| good
2026-09-28T12:00:00.000Z	33 \| good	5.601 \| good	11.979 \| good	23.502 \| good	0.707 \| good	7.396 \| good	0.188 \| good
2026-09-28T13:00:00.000Z	33 \| good	5.601 \| good	11.577 \| good	26.354 \| good	0.531 \| good	7.035 \| good	0.165 \| good
2026-09-28T14:00:00.000Z	33 \| good	5.574 \| good	11.439 \| good	26.152 \| good	0.502 \| good	6.335 \| good	0.162 \| good
2026-09-28T15:00:00.000Z	27 \| good	5.172 \| good	11.439 \| good	26.398 \| good	0.649 \| good	6.52 \| good	0.156 \| good
2026-09-28T16:00:00.000Z	27 \| good	5.199 \| good	11.175 \| good	28.465 \| good	0.591 \| good	6.482 \| good	0.153 \| good
2026-09-28T17:00:00.000Z	27 \| good	5.199 \| good	11.175 \| good	29.427 \| good	0.766 \| good	6.998 \| good	0.169 \| good
2026-09-28T18:00:00.000Z	28 \| good	5.172 \| good	11.037 \| good	29.917 \| good	0.71 \| good	7.514 \| good	0.216 \| good
2026-09-28T19:00:00.000Z	33 \| good	5.573 \| good	11.719 \| good	31.354 \| good	0.675 \| good	8.28 \| good	0.253 \| good
2026-09-28T20:00:00.000Z	28 \| good	4.797 \| good	10.773 \| good	29.987 \| good	0.534 \| good	7.514 \| good	0.324 \| good
2026-09-28T21:00:00.000Z	30 \| good	4.797 \| good	10.773 \| good	32.07 \| good	0.536 \| good	7.396 \| good	0.312 \| good
2026-09-28T22:00:00.000Z	29 \| good	4.797 \| good	10.773 \| good	30.825 \| good	0.647 \| good	7.551 \| good	0.352 \| good
2026-09-28T22:00:00.000Z	31 \| good	4.021 \| good	12.645 \| good	32.626 \| good	0.592 \| good	7.681 \| good	0.312 \| good
2026-09-28T23:00:00.000Z	27 \| good	4.712 \| good	8.26 \| good	23.042 \| good	0.335 \| good	7.237 \| good	0.143 \| good
2026-09-29T00:00:00.000Z	23 \| good	4.416 \| good	8.006 \| good	24.771 \| good	0.282 \| good	6.038 \| good	0.136 \| good
2026-09-29T01:00:00.000Z	25 \| good	4.404 \| good	7.298 \| good	26.57 \| good	0.236 \| good	5.177 \| good	0.128 \| good
2026-09-29T02:00:00.000Z	25 \| good	3.609 \| good	7.132 \| good	26.531 \| good	0.214 \| good	4.335 \| good	0.125 \| good
2026-09-29T03:00:00.000Z	24 \| good	4.042 \| good	7.062 \| good	25.984 \| good	0.208 \| good	4.123 \| good	0.123 \| good
2026-09-29T04:00:00.000Z	24 \| good	4.444 \| good	7.177 \| good	25.664 \| good	0.209 \| good	4.091 \| good	0.124 \| good
2026-09-29T05:00:00.000Z	24 \| good	4.474 \| good	7.186 \| good	26.035 \| good	0.221 \| good	4.774 \| good	0.123 \| good
2026-09-29T06:00:00.000Z	22 \| good	4.328 \| good	7.356 \| good	23.184 \| good	0.268 \| good	6.842 \| good	0.127 \| good
2026-09-29T07:00:00.000Z	27 \| good	5.272 \| good	8.063 \| good	20.289 \| good	0.392 \| good	11.175 \| good	0.142 \| good
2026-09-29T08:00:00.000Z	33 \| good	6.255 \| good	8.644 \| good	19.506 \| good	0.509 \| good	11.583 \| good	0.153 \| good
2026-09-29T09:00:00.000Z	38 \| good	7.293 \| good	9.746 \| good	22.245 \| good	0.548 \| good	9.884 \| good	0.162 \| good
2026-09-29T10:00:00.000Z	52 \| moderate	9.753 \| good	12.674 \| good	24.599 \| good	0.622 \| good	7.933 \| good	0.167 \| good
2026-09-29T11:00:00.000Z	49 \| good	8.977 \| good	12.42 \| good	28.284 \| good	0.647 \| good	6.89 \| good	0.17 \| good
2026-09-29T12:00:00.000Z	52 \| moderate	9.752 \| good	13.438 \| good	33.309 \| good	0.64 \| good	7.344 \| good	0.171 \| good
2026-09-29T13:00:00.000Z	49 \| good	8.944 \| good	13.44 \| good	37.409 \| good	0.651 \| good	5.682 \| good	0.167 \| good
2026-09-29T14:00:00.000Z	49 \| good	8.673 \| good	12.626 \| good	39.368 \| good	0.593 \| good	6.049 \| good	0.165 \| good
2026-09-29T15:00:00.000Z	44 \| good	8.349 \| good	12.633 \| good	39.969 \| good	0.526 \| good	6.034 \| good	0.162 \| good
2026-09-29T16:00:00.000Z	44 \| good	7.982 \| good	12.947 \| good	39.51 \| good	0.46 \| good	6.988 \| good	0.16 \| good
2026-09-29T17:00:00.000Z	44 \| good	8.364 \| good	13.349 \| good	37.959 \| good	0.471 \| good	9.098 \| good	0.169 \| good
2026-09-29T18:00:00.000Z	49 \| good	9.281 \| good	15.759 \| good	32.72 \| good	0.549 \| good	12.157 \| good	0.179 \| good
2026-09-29T19:00:00.000Z	49 \| good	9.474 \| good	17.379 \| good	29.136 \| good	0.672 \| good	15.005 \| good	0.184 \| good
2026-09-29T20:00:00.000Z	54 \| moderate	10.8 \| good	18.283 \| good	29.137 \| good	0.691 \| good	14.715 \| good	0.18 \| good
2026-09-29T21:00:00.000Z	52 \| moderate	10.465 \| good	17.31 \| good	28.392 \| good	0.582 \| good	11.398 \| good	0.165 \| good
2026-09-29T22:00:00.000Z	52 \| moderate	9.541 \| good	15.098 \| good	28.624 \| good	0.447 \| good	9.462 \| good	0.156 \| good
2026-09-29T23:00:00.000Z	44 \| good	7.686 \| good	12.453 \| good	32.719 \| good	0.424 \| good	7.203 \| good	0.145 \| good
2026-09-30T00:00:00.000Z	38 \| good	6.501 \| good	10.629 \| good	33.18 \| good	0.352 \| good	5.638 \| good	0.141 \| good
2026-09-30T01:00:00.000Z	30 \| good	5.198 \| good	9.302 \| good	32.387 \| good	0.328 \| good	4.182 \| good	0.131 \| good
2026-09-30T02:00:00.000Z	31 \| good	4.539 \| good	8.97 \| good	32.733 \| good	0.363 \| good	3.151 \| good	0.128 \| good
2026-09-30T03:00:00.000Z	31 \| good	4.648 \| good	9.413 \| good	32.902 \| good	0.352 \| good	2.817 \| good	0.128 \| good
2026-09-30T04:00:00.000Z	30 \| good	4.755 \| good	10.828 \| good	32.214 \| good	0.338 \| good	2.976 \| good	0.127 \| good
2026-09-30T05:00:00.000Z	31 \| good	4.993 \| good	11.542 \| good	32.519 \| good	0.266 \| good	3.513 \| good	0.127 \| good
2026-09-30T06:00:00.000Z	33 \| good	5.816 \| good	11.489 \| good	32.163 \| good	0.263 \| good	4.861 \| good	0.13 \| good
2026-09-30T07:00:00.000Z	33 \| good	6.277 \| good	11.062 \| good	28.74 \| good	0.342 \| good	7.137 \| good	0.136 \| good
2026-09-30T08:00:00.000Z	27 \| good	5.18 \| good	8.793 \| good	25.949 \| good	0.316 \| good	8.031 \| good	0.138 \| good
2026-09-30T09:00:00.000Z	27 \| good	4.925 \| good	7.109 \| good	25.387 \| good	0.277 \| good	8.095 \| good	0.138 \| good
2026-09-30T10:00:00.000Z	33 \| good	5.859 \| good	6.835 \| good	28.508 \| good	0.208 \| good	5.183 \| good	0.129 \| good
2026-09-30T11:00:00.000Z	33 \| good	5.9 \| good	7.91 \| good	31.478 \| good	0.197 \| good	3.848 \| good	0.121 \| good
2026-09-30T12:00:00.000Z	30 \| good	5.084 \| good	7.8 \| good	31.923 \| good	0.167 \| good	3.432 \| good	0.118 \| good
2026-09-30T13:00:00.000Z	31 \| good	4.842 \| good	7.573 \| good	33.55 \| good	0.151 \| good	3.005 \| good	0.117 \| good
2026-09-30T14:00:00.000Z	32 \| good	4.403 \| good	7.702 \| good	35.366 \| good	0.146 \| good	3 \| good	0.118 \| good
2026-09-30T15:00:00.000Z	31 \| good	4.474 \| good	8.212 \| good	34.244 \| good	0.165 \| good	3.603 \| good	0.12 \| good
2026-09-30T16:00:00.000Z	31 \| good	4.638 \| good	8.454 \| good	32.816 \| good	0.208 \| good	4.916 \| good	0.123 \| good
2026-09-30T17:00:00.000Z	28 \| good	5.239 \| good	9.244 \| good	29.532 \| good	0.262 \| good	7.957 \| good	0.133 \| good
2026-09-30T18:00:00.000Z	33 \| good	5.77 \| good	11.481 \| good	24.76 \| good	0.373 \| good	10.175 \| good	0.145 \| good
2026-09-30T19:00:00.000Z	38 \| good	6.572 \| good	12.653 \| good	21.586 \| good	0.437 \| good	11.785 \| good	0.146 \| good
2026-09-30T20:00:00.000Z	38 \| good	7.066 \| good	13.878 \| good	20.711 \| good	0.492 \| good	11.43 \| good	0.148 \| good
2026-09-30T21:00:00.000Z	38 \| good	7.417 \| good	15.639 \| good	19.258 \| good	0.556 \| good	11.249 \| good	0.151 \| good
2026-09-30T22:00:00.000Z	44 \| good	7.729 \| good	16.132 \| good	18.847 \| good	0.582 \| good	11.984 \| good	0.155 \| good

Watford

Empower business decisions with accurate air quality data

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

0.31ppm

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

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 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 2026-09-27.

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

The best air quality in Watford, Hertfordshire was recorded at 05:00:00 on 2026-09-28.

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

The real-time air quality index in Watford, Hertfordshire is 31, currently categorized as Good.

Which pollutant is found most often in Watford, Hertfordshire?

The most common pollutant in Watford, Hertfordshire is O3.

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 4.021 μg/m³.

What are the current PM₁₀ levels at Watford, Hertfordshire?

The current PM₁₀ levels in Watford, Hertfordshire are 12.645 μg/m³.

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

The current carbon monoxide (CO) level in Watford, Hertfordshire is 0.312 ppm.

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

The current sulfur dioxide (SO₂) levels in Watford, Hertfordshire are 0.592 ppb.

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

The current ozone (O₃) levels at Watford, Hertfordshire is 32.626 ppm.

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

The current nitrogen dioxide (NO₂) levels at Watford, Hertfordshire is 7.681 ppb.

Certified

APIs

Refund Policy

Historical Climate Data

Terms & Conditions

Refund Policy

Terms & Conditions

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-26T23:00:00.000Z	38 \| good	6.618 \| good	17.715 \| good	27.205 \| good	0.636 \| good	13.108 \| good	0.297 \| good
2026-09-27T00:00:00.000Z	44 \| good	8.178 \| good	22.629 \| good	22.723 \| good	0.733 \| good	22.322 \| good	0.226 \| good
2026-09-27T01:00:00.000Z	52 \| moderate	10.051 \| good	23.913 \| good	24.565 \| good	0.754 \| good	18.873 \| good	0.229 \| good
2026-09-27T02:00:00.000Z	52 \| moderate	10.279 \| good	24.255 \| good	21.274 \| good	0.68 \| good	17.301 \| good	0.212 \| good
2026-09-27T03:00:00.000Z	52 \| moderate	10.322 \| good	24.811 \| good	19.548 \| good	0.717 \| good	16.801 \| good	0.217 \| good
2026-09-27T04:00:00.000Z	52 \| moderate	10.322 \| good	24.811 \| good	19.862 \| good	0.692 \| good	17.041 \| good	0.205 \| good
2026-09-27T05:00:00.000Z	52 \| moderate	10.496 \| good	26.009 \| good	22.438 \| good	0.679 \| good	16.019 \| good	0.001 \| good
2026-09-27T06:00:00.000Z	52 \| moderate	10.496 \| good	26.411 \| good	25.107 \| good	0.655 \| good	14.369 \| good	0.001 \| good
2026-09-27T07:00:00.000Z	52 \| moderate	10.496 \| good	26.411 \| good	27.509 \| good	0.655 \| good	14.797 \| good	0.001 \| good
2026-09-27T08:00:00.000Z	54 \| moderate	10.787 \| good	25.996 \| good	25.348 \| good	0.653 \| good	14.095 \| good	0.001 \| good
2026-09-27T09:00:00.000Z	54 \| moderate	10.76 \| good	25.858 \| good	23.893 \| good	0.625 \| good	13.24 \| good	0.001 \| good
2026-09-27T10:00:00.000Z	54 \| moderate	10.663 \| good	25.444 \| good	24.766 \| good	0.628 \| good	12.11 \| good	0.002 \| good
2026-09-27T11:00:00.000Z	54 \| moderate	10.622 \| good	25.306 \| good	27.014 \| good	0.679 \| good	10.919 \| good	0.001 \| good
2026-09-27T12:00:00.000Z	54 \| moderate	10.594 \| good	25.57 \| good	24.619 \| good	0.705 \| good	10.217 \| good	0.001 \| good
2026-09-27T13:00:00.000Z	54 \| moderate	10.594 \| good	25.57 \| good	28.652 \| good	0.706 \| good	10.157 \| good	0.001 \| good
2026-09-27T14:00:00.000Z	54 \| moderate	11.024 \| good	25.708 \| good	28.332 \| good	0.705 \| good	9.822 \| good	0.001 \| good
2026-09-27T15:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	28.97 \| good	0.705 \| good	9.608 \| good	0.001 \| good
2026-09-27T16:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	31.763 \| good	0.679 \| good	9.608 \| good	0.001 \| good
2026-09-27T17:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	33.685 \| good	0.706 \| good	9.882 \| good	0.001 \| good
2026-09-27T18:00:00.000Z	54 \| moderate	11.024 \| good	26.11 \| good	33.02 \| good	0.679 \| good	9.882 \| good	0.002 \| good
2026-09-27T19:00:00.000Z	54 \| moderate	11.277 \| good	24.801 \| good	34.516 \| good	0.677 \| good	11.498 \| good	0.003 \| good
2026-09-27T20:00:00.000Z	54 \| moderate	10.996 \| good	25.972 \| good	32.374 \| good	0.653 \| good	11.073 \| good	0.002 \| good
2026-09-27T21:00:00.000Z	54 \| moderate	10.567 \| good	25.03 \| good	33.352 \| good	0.655 \| good	11.073 \| good	0.002 \| good
2026-09-27T22:00:00.000Z	52 \| moderate	9.763 \| good	24.226 \| good	29.638 \| good	0.501 \| good	10.399 \| good	0.002 \| good
2026-09-27T23:00:00.000Z	49 \| good	9.319 \| good	23.686 \| good	30.813 \| good	0.654 \| good	10.732 \| good	0.002 \| good
2026-09-28T00:00:00.000Z	38 \| good	6.782 \| good	16.753 \| good	30.863 \| good	0.722 \| good	6.184 \| good	0.255 \| good
2026-09-28T01:00:00.000Z	38 \| good	7.355 \| good	13.103 \| good	29.517 \| good	0.747 \| good	5.86 \| good	0.18 \| good
2026-09-28T02:00:00.000Z	38 \| good	7.469 \| good	13.445 \| good	28.077 \| good	0.689 \| good	4.968 \| good	0.226 \| good
2026-09-28T03:00:00.000Z	38 \| good	7.44 \| good	13.304 \| good	27.892 \| good	0.748 \| good	5.534 \| good	0.214 \| good
2026-09-28T04:00:00.000Z	38 \| good	7.027 \| good	13.304 \| good	27.077 \| good	0.751 \| good	7.376 \| good	0.217 \| good
2026-09-28T05:00:00.000Z	33 \| good	6.281 \| good	12.092 \| good	27.526 \| good	0.653 \| good	7.021 \| good	0.197 \| good
2026-09-28T06:00:00.000Z	33 \| good	6.239 \| good	11.954 \| good	26.864 \| good	0.653 \| good	6.319 \| good	0.21 \| good
2026-09-28T07:00:00.000Z	33 \| good	5.879 \| good	11.69 \| good	22.244 \| good	0.651 \| good	6.96 \| good	0.279 \| good
2026-09-28T08:00:00.000Z	33 \| good	5.907 \| good	11.828 \| good	25.76 \| good	0.65 \| good	8.607 \| good	0.264 \| good
2026-09-28T09:00:00.000Z	33 \| good	5.948 \| good	12.104 \| good	21.488 \| good	0.679 \| good	11.391 \| good	0.235 \| good
2026-09-28T10:00:00.000Z	33 \| good	5.976 \| good	12.242 \| good	23.576 \| good	0.679 \| good	9.136 \| good	0.221 \| good
2026-09-28T11:00:00.000Z	33 \| good	5.601 \| good	11.979 \| good	19.688 \| good	0.705 \| good	8.193 \| good	0.212 \| good
2026-09-28T12:00:00.000Z	33 \| good	5.601 \| good	11.979 \| good	23.502 \| good	0.707 \| good	7.396 \| good	0.188 \| good
2026-09-28T13:00:00.000Z	33 \| good	5.601 \| good	11.577 \| good	26.354 \| good	0.531 \| good	7.035 \| good	0.165 \| good
2026-09-28T14:00:00.000Z	33 \| good	5.574 \| good	11.439 \| good	26.152 \| good	0.502 \| good	6.335 \| good	0.162 \| good
2026-09-28T15:00:00.000Z	27 \| good	5.172 \| good	11.439 \| good	26.398 \| good	0.649 \| good	6.52 \| good	0.156 \| good
2026-09-28T16:00:00.000Z	27 \| good	5.199 \| good	11.175 \| good	28.465 \| good	0.591 \| good	6.482 \| good	0.153 \| good
2026-09-28T17:00:00.000Z	27 \| good	5.199 \| good	11.175 \| good	29.427 \| good	0.766 \| good	6.998 \| good	0.169 \| good
2026-09-28T18:00:00.000Z	28 \| good	5.172 \| good	11.037 \| good	29.917 \| good	0.71 \| good	7.514 \| good	0.216 \| good
2026-09-28T19:00:00.000Z	33 \| good	5.573 \| good	11.719 \| good	31.354 \| good	0.675 \| good	8.28 \| good	0.253 \| good
2026-09-28T20:00:00.000Z	28 \| good	4.797 \| good	10.773 \| good	29.987 \| good	0.534 \| good	7.514 \| good	0.324 \| good
2026-09-28T21:00:00.000Z	30 \| good	4.797 \| good	10.773 \| good	32.07 \| good	0.536 \| good	7.396 \| good	0.312 \| good
2026-09-28T22:00:00.000Z	29 \| good	4.797 \| good	10.773 \| good	30.825 \| good	0.647 \| good	7.551 \| good	0.352 \| good
2026-09-28T22:00:00.000Z	31 \| good	4.021 \| good	12.645 \| good	32.626 \| good	0.592 \| good	7.681 \| good	0.312 \| good
2026-09-28T23:00:00.000Z	27 \| good	4.712 \| good	8.26 \| good	23.042 \| good	0.335 \| good	7.237 \| good	0.143 \| good
2026-09-29T00:00:00.000Z	23 \| good	4.416 \| good	8.006 \| good	24.771 \| good	0.282 \| good	6.038 \| good	0.136 \| good
2026-09-29T01:00:00.000Z	25 \| good	4.404 \| good	7.298 \| good	26.57 \| good	0.236 \| good	5.177 \| good	0.128 \| good
2026-09-29T02:00:00.000Z	25 \| good	3.609 \| good	7.132 \| good	26.531 \| good	0.214 \| good	4.335 \| good	0.125 \| good
2026-09-29T03:00:00.000Z	24 \| good	4.042 \| good	7.062 \| good	25.984 \| good	0.208 \| good	4.123 \| good	0.123 \| good
2026-09-29T04:00:00.000Z	24 \| good	4.444 \| good	7.177 \| good	25.664 \| good	0.209 \| good	4.091 \| good	0.124 \| good
2026-09-29T05:00:00.000Z	24 \| good	4.474 \| good	7.186 \| good	26.035 \| good	0.221 \| good	4.774 \| good	0.123 \| good
2026-09-29T06:00:00.000Z	22 \| good	4.328 \| good	7.356 \| good	23.184 \| good	0.268 \| good	6.842 \| good	0.127 \| good
2026-09-29T07:00:00.000Z	27 \| good	5.272 \| good	8.063 \| good	20.289 \| good	0.392 \| good	11.175 \| good	0.142 \| good
2026-09-29T08:00:00.000Z	33 \| good	6.255 \| good	8.644 \| good	19.506 \| good	0.509 \| good	11.583 \| good	0.153 \| good
2026-09-29T09:00:00.000Z	38 \| good	7.293 \| good	9.746 \| good	22.245 \| good	0.548 \| good	9.884 \| good	0.162 \| good
2026-09-29T10:00:00.000Z	52 \| moderate	9.753 \| good	12.674 \| good	24.599 \| good	0.622 \| good	7.933 \| good	0.167 \| good
2026-09-29T11:00:00.000Z	49 \| good	8.977 \| good	12.42 \| good	28.284 \| good	0.647 \| good	6.89 \| good	0.17 \| good
2026-09-29T12:00:00.000Z	52 \| moderate	9.752 \| good	13.438 \| good	33.309 \| good	0.64 \| good	7.344 \| good	0.171 \| good
2026-09-29T13:00:00.000Z	49 \| good	8.944 \| good	13.44 \| good	37.409 \| good	0.651 \| good	5.682 \| good	0.167 \| good
2026-09-29T14:00:00.000Z	49 \| good	8.673 \| good	12.626 \| good	39.368 \| good	0.593 \| good	6.049 \| good	0.165 \| good
2026-09-29T15:00:00.000Z	44 \| good	8.349 \| good	12.633 \| good	39.969 \| good	0.526 \| good	6.034 \| good	0.162 \| good
2026-09-29T16:00:00.000Z	44 \| good	7.982 \| good	12.947 \| good	39.51 \| good	0.46 \| good	6.988 \| good	0.16 \| good
2026-09-29T17:00:00.000Z	44 \| good	8.364 \| good	13.349 \| good	37.959 \| good	0.471 \| good	9.098 \| good	0.169 \| good
2026-09-29T18:00:00.000Z	49 \| good	9.281 \| good	15.759 \| good	32.72 \| good	0.549 \| good	12.157 \| good	0.179 \| good
2026-09-29T19:00:00.000Z	49 \| good	9.474 \| good	17.379 \| good	29.136 \| good	0.672 \| good	15.005 \| good	0.184 \| good
2026-09-29T20:00:00.000Z	54 \| moderate	10.8 \| good	18.283 \| good	29.137 \| good	0.691 \| good	14.715 \| good	0.18 \| good
2026-09-29T21:00:00.000Z	52 \| moderate	10.465 \| good	17.31 \| good	28.392 \| good	0.582 \| good	11.398 \| good	0.165 \| good
2026-09-29T22:00:00.000Z	52 \| moderate	9.541 \| good	15.098 \| good	28.624 \| good	0.447 \| good	9.462 \| good	0.156 \| good
2026-09-29T23:00:00.000Z	44 \| good	7.686 \| good	12.453 \| good	32.719 \| good	0.424 \| good	7.203 \| good	0.145 \| good
2026-09-30T00:00:00.000Z	38 \| good	6.501 \| good	10.629 \| good	33.18 \| good	0.352 \| good	5.638 \| good	0.141 \| good
2026-09-30T01:00:00.000Z	30 \| good	5.198 \| good	9.302 \| good	32.387 \| good	0.328 \| good	4.182 \| good	0.131 \| good
2026-09-30T02:00:00.000Z	31 \| good	4.539 \| good	8.97 \| good	32.733 \| good	0.363 \| good	3.151 \| good	0.128 \| good
2026-09-30T03:00:00.000Z	31 \| good	4.648 \| good	9.413 \| good	32.902 \| good	0.352 \| good	2.817 \| good	0.128 \| good
2026-09-30T04:00:00.000Z	30 \| good	4.755 \| good	10.828 \| good	32.214 \| good	0.338 \| good	2.976 \| good	0.127 \| good
2026-09-30T05:00:00.000Z	31 \| good	4.993 \| good	11.542 \| good	32.519 \| good	0.266 \| good	3.513 \| good	0.127 \| good
2026-09-30T06:00:00.000Z	33 \| good	5.816 \| good	11.489 \| good	32.163 \| good	0.263 \| good	4.861 \| good	0.13 \| good
2026-09-30T07:00:00.000Z	33 \| good	6.277 \| good	11.062 \| good	28.74 \| good	0.342 \| good	7.137 \| good	0.136 \| good
2026-09-30T08:00:00.000Z	27 \| good	5.18 \| good	8.793 \| good	25.949 \| good	0.316 \| good	8.031 \| good	0.138 \| good
2026-09-30T09:00:00.000Z	27 \| good	4.925 \| good	7.109 \| good	25.387 \| good	0.277 \| good	8.095 \| good	0.138 \| good
2026-09-30T10:00:00.000Z	33 \| good	5.859 \| good	6.835 \| good	28.508 \| good	0.208 \| good	5.183 \| good	0.129 \| good
2026-09-30T11:00:00.000Z	33 \| good	5.9 \| good	7.91 \| good	31.478 \| good	0.197 \| good	3.848 \| good	0.121 \| good
2026-09-30T12:00:00.000Z	30 \| good	5.084 \| good	7.8 \| good	31.923 \| good	0.167 \| good	3.432 \| good	0.118 \| good
2026-09-30T13:00:00.000Z	31 \| good	4.842 \| good	7.573 \| good	33.55 \| good	0.151 \| good	3.005 \| good	0.117 \| good
2026-09-30T14:00:00.000Z	32 \| good	4.403 \| good	7.702 \| good	35.366 \| good	0.146 \| good	3 \| good	0.118 \| good
2026-09-30T15:00:00.000Z	31 \| good	4.474 \| good	8.212 \| good	34.244 \| good	0.165 \| good	3.603 \| good	0.12 \| good
2026-09-30T16:00:00.000Z	31 \| good	4.638 \| good	8.454 \| good	32.816 \| good	0.208 \| good	4.916 \| good	0.123 \| good
2026-09-30T17:00:00.000Z	28 \| good	5.239 \| good	9.244 \| good	29.532 \| good	0.262 \| good	7.957 \| good	0.133 \| good
2026-09-30T18:00:00.000Z	33 \| good	5.77 \| good	11.481 \| good	24.76 \| good	0.373 \| good	10.175 \| good	0.145 \| good
2026-09-30T19:00:00.000Z	38 \| good	6.572 \| good	12.653 \| good	21.586 \| good	0.437 \| good	11.785 \| good	0.146 \| good
2026-09-30T20:00:00.000Z	38 \| good	7.066 \| good	13.878 \| good	20.711 \| good	0.492 \| good	11.43 \| good	0.148 \| good
2026-09-30T21:00:00.000Z	38 \| good	7.417 \| good	15.639 \| good	19.258 \| good	0.556 \| good	11.249 \| good	0.151 \| good
2026-09-30T22:00:00.000Z	44 \| good	7.729 \| good	16.132 \| good	18.847 \| good	0.582 \| good	11.984 \| good	0.155 \| 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

Bushey, Hertfordshire

Abbots Langley, Hertfordshire

Rickmansworth, Hertfordshire

Chorleywood, Hertfordshire

Borehamwood, Hertfordshire

St Albans, Hertfordshire

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?