What is the current concentration of sulfur dioxide (SO2) in Welwyn Garden City, Hertfordshire?

The current sulfur dioxide (SO2) concentration at Welwyn Garden City, Hertfordshire is 0.592 ppb.

What is the current concentration of ozone (O3) in Welwyn Garden City, Hertfordshire?

The current ozone (O3) concentration at Welwyn Garden City, Hertfordshire is 32.6 ppm.

What is the current concentration of nitrogen dioxide (NO2) in Welwyn Garden City, Hertfordshire?

The current nitrogen dioxide (NO2) concentration at Welwyn Garden City, Hertfordshire is 5.354 ppb.

Welwyn Garden City, Hertfordshire live air quality index now

Q: What is the current concentration of PM2.5 in Welwyn Garden City, Hertfordshire?

The current PM2.5 concentration at Welwyn Garden City, Hertfordshire is 4.247 μg/m3.

Q: What is the current concentration of PM10 in Welwyn Garden City, Hertfordshire?

The current PM10 concentration at Welwyn Garden City, Hertfordshire is 14.08 μg/m3.

Stay updated with real-time air quality in Welwyn Garden City, 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

Welwyn Garden City, Hertfordshire

Last updated: ... (Local time)

Major air pollutants in Welwyn Garden City, Hertfordshire

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

4.25 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

14.08 μg/m³

155

255

425

605+

Ozone (O₃)

32.60 ppb

201

201+

Sulfur Dioxide (SO₂)

0.59 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

5.35 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.31 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Welwyn Garden City, Hertfordshire

Get Live Pollen Counts

Welwyn Garden City, Hertfordshire

Scroll To Air Quality Map

Track live Welwyn Garden City, Hertfordshire air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-26T23:00:00.000Z	22 \| good	4.371 \| good	14.036 \| good	20.487 \| good	0.644 \| good	19.077 \| good	0.297 \| good
2026-09-27T00:00:00.000Z	33 \| good	5.7 \| good	15.807 \| good	20.034 \| good	0.698 \| good	17.318 \| good	0.226 \| good
2026-09-27T01:00:00.000Z	44 \| good	7.982 \| good	17.394 \| good	18.623 \| good	0.732 \| good	25.405 \| good	0.229 \| good
2026-09-27T02:00:00.000Z	38 \| good	7.38 \| good	19.403 \| good	17.987 \| good	0.599 \| good	33.384 \| good	0.212 \| good
2026-09-27T03:00:00.000Z	44 \| good	7.527 \| good	17.276 \| good	9.423 \| good	0.663 \| good	20.48 \| good	0.217 \| good
2026-09-27T04:00:00.000Z	52 \| moderate	9.787 \| good	17.134 \| good	14.592 \| good	0.596 \| good	21.823 \| good	0.205 \| good
2026-09-27T05:00:00.000Z	38 \| good	6.598 \| good	15.38 \| good	14.49 \| good	0.665 \| good	32.12 \| good	0.007 \| good
2026-09-27T06:00:00.000Z	52 \| moderate	10.33 \| good	22.488 \| good	15.882 \| good	0.598 \| good	13.23 \| good	0.006 \| good
2026-09-27T07:00:00.000Z	38 \| good	6.828 \| good	18.055 \| good	24.432 \| good	0.596 \| good	13.362 \| good	0.006 \| good
2026-09-27T08:00:00.000Z	44 \| good	8.181 \| good	26.4 \| good	20.969 \| good	0.594 \| good	15.298 \| good	0.007 \| good
2026-09-27T09:00:00.000Z	52 \| moderate	9.698 \| good	20.591 \| good	16.969 \| good	0.521 \| good	11.596 \| good	0.006 \| good
2026-09-27T10:00:00.000Z	52 \| moderate	9.962 \| good	29.6 \| good	19.542 \| good	0.521 \| good	15.489 \| good	0.008 \| good
2026-09-27T11:00:00.000Z	49 \| good	9.417 \| good	16.774 \| good	24.677 \| good	0.665 \| good	14.007 \| good	0.006 \| good
2026-09-27T12:00:00.000Z	52 \| moderate	9.569 \| good	18.697 \| good	22.844 \| good	0.738 \| good	7.394 \| good	0.006 \| good
2026-09-27T13:00:00.000Z	49 \| good	8.643 \| good	25.628 \| good	27.29 \| good	0.738 \| good	13.66 \| good	0.006 \| good
2026-09-27T14:00:00.000Z	49 \| good	9.16 \| good	20.281 \| good	28.808 \| good	0.737 \| good	14.601 \| good	0.006 \| good
2026-09-27T15:00:00.000Z	56 \| moderate	11.976 \| good	26.141 \| good	24.248 \| good	0.738 \| good	12.36 \| good	0.006 \| good
2026-09-27T16:00:00.000Z	52 \| moderate	9.719 \| good	18.594 \| good	31.863 \| good	0.665 \| good	8.311 \| good	0.006 \| good
2026-09-27T17:00:00.000Z	58 \| moderate	13.293 \| fine	19.593 \| good	34.755 \| good	0.738 \| good	12.651 \| good	0.006 \| good
2026-09-27T18:00:00.000Z	58 \| moderate	13.19 \| fine	20.855 \| good	34.905 \| good	0.666 \| good	9.566 \| good	0.007 \| good
2026-09-27T19:00:00.000Z	52 \| moderate	9.753 \| good	24.408 \| good	35.743 \| good	0.665 \| good	10.268 \| good	0.008 \| good
2026-09-27T20:00:00.000Z	54 \| moderate	11.383 \| good	23.391 \| good	30.093 \| good	0.594 \| good	15.287 \| good	0.009 \| good
2026-09-27T21:00:00.000Z	52 \| moderate	10.098 \| good	17.653 \| good	35.033 \| good	0.598 \| good	9.731 \| good	0.012 \| good
2026-09-27T22:00:00.000Z	38 \| good	7.194 \| good	21.917 \| good	29.201 \| good	0.51 \| good	7.544 \| good	0.01 \| good
2026-09-27T23:00:00.000Z	38 \| good	6.857 \| good	19.477 \| good	34.044 \| good	0.595 \| good	6.396 \| good	0.011 \| good
2026-09-28T00:00:00.000Z	33 \| good	6.492 \| good	17.273 \| good	33.29 \| good	0.687 \| good	5.321 \| good	0.255 \| good
2026-09-28T01:00:00.000Z	27 \| good	4.648 \| good	14.922 \| good	26.354 \| good	0.726 \| good	5.573 \| good	0.18 \| good
2026-09-28T02:00:00.000Z	33 \| good	5.922 \| good	13.784 \| good	25.189 \| good	0.595 \| good	5.937 \| good	0.226 \| good
2026-09-28T03:00:00.000Z	33 \| good	5.775 \| good	15.763 \| good	26.963 \| good	0.729 \| good	5.938 \| good	0.214 \| good
2026-09-28T04:00:00.000Z	33 \| good	5.869 \| good	18.104 \| good	25.908 \| good	0.727 \| good	7.413 \| good	0.218 \| good
2026-09-28T05:00:00.000Z	33 \| good	5.954 \| good	12.585 \| good	22.893 \| good	0.596 \| good	8.192 \| good	0.197 \| good
2026-09-28T06:00:00.000Z	27 \| good	5.397 \| good	14.86 \| good	22.727 \| good	0.598 \| good	5.603 \| good	0.21 \| good
2026-09-28T07:00:00.000Z	27 \| good	5.293 \| good	9.901 \| good	12.906 \| good	0.596 \| good	13.105 \| good	0.279 \| good
2026-09-28T08:00:00.000Z	27 \| good	5.444 \| good	11.015 \| good	19.395 \| good	0.593 \| good	10.991 \| good	0.264 \| good
2026-09-28T09:00:00.000Z	27 \| good	4.824 \| good	10.824 \| good	23.255 \| good	0.667 \| good	12.119 \| good	0.235 \| good
2026-09-28T10:00:00.000Z	22 \| good	3.805 \| good	8.964 \| good	18.376 \| good	0.666 \| good	11.401 \| good	0.221 \| good
2026-09-28T11:00:00.000Z	16 \| good	3.488 \| good	12.08 \| good	10.735 \| good	0.735 \| good	8.333 \| good	0.212 \| good
2026-09-28T12:00:00.000Z	27 \| good	4.855 \| good	11.884 \| good	19.081 \| good	0.738 \| good	9.142 \| good	0.188 \| good
2026-09-28T13:00:00.000Z	27 \| good	4.711 \| good	10.139 \| good	14.613 \| good	0.585 \| good	10.709 \| good	0.165 \| good
2026-09-28T14:00:00.000Z	22 \| good	4.406 \| good	8.545 \| good	20.552 \| good	0.511 \| good	6.636 \| good	0.162 \| good
2026-09-28T15:00:00.000Z	22 \| good	3.955 \| good	11.027 \| good	24.225 \| good	0.591 \| good	9.511 \| good	0.156 \| good
2026-09-28T16:00:00.000Z	22 \| good	3.997 \| good	9.701 \| good	22.493 \| good	0.736 \| good	7.452 \| good	0.153 \| good
2026-09-28T17:00:00.000Z	24 \| good	3.599 \| good	7.374 \| good	25.882 \| good	0.887 \| good	5.686 \| good	0.169 \| good
2026-09-28T18:00:00.000Z	27 \| good	3.6 \| good	12.68 \| good	28.516 \| good	0.743 \| good	6.636 \| good	0.216 \| good
2026-09-28T19:00:00.000Z	28 \| good	3.499 \| good	11.076 \| good	30.209 \| good	0.663 \| good	10.533 \| good	0.253 \| good
2026-09-28T20:00:00.000Z	27 \| good	4.906 \| good	12.428 \| good	28.046 \| good	0.589 \| good	8.187 \| good	0.324 \| good
2026-09-28T21:00:00.000Z	25 \| good	4.186 \| good	10.432 \| good	27.42 \| good	0.594 \| good	5.304 \| good	0.312 \| good
2026-09-28T22:00:00.000Z	27 \| good	5.04 \| good	11.38 \| good	25.816 \| good	0.588 \| good	5.972 \| good	0.352 \| good
2026-09-28T22:00:00.000Z	31 \| good	4.247 \| good	14.08 \| good	32.6 \| good	0.592 \| good	5.354 \| good	0.312 \| good
2026-09-28T23:00:00.000Z	27 \| good	4.635 \| good	8.048 \| good	23.379 \| good	0.257 \| good	4.981 \| good	0.141 \| good
2026-09-29T00:00:00.000Z	24 \| good	4.268 \| good	7.332 \| good	26.153 \| good	0.203 \| good	4.041 \| good	0.132 \| good
2026-09-29T01:00:00.000Z	24 \| good	3.876 \| good	7.004 \| good	26.245 \| good	0.166 \| good	3.542 \| good	0.127 \| good
2026-09-29T02:00:00.000Z	24 \| good	3.563 \| good	6.805 \| good	26.085 \| good	0.164 \| good	3.152 \| good	0.123 \| good
2026-09-29T03:00:00.000Z	24 \| good	3.624 \| good	7.556 \| good	25.68 \| good	0.155 \| good	3.084 \| good	0.121 \| good
2026-09-29T04:00:00.000Z	24 \| good	3.907 \| good	6.958 \| good	26.179 \| good	0.155 \| good	3.228 \| good	0.122 \| good
2026-09-29T05:00:00.000Z	24 \| good	4.354 \| good	7.273 \| good	26.186 \| good	0.164 \| good	3.166 \| good	0.121 \| good
2026-09-29T06:00:00.000Z	23 \| good	4.191 \| good	6.738 \| good	24.99 \| good	0.192 \| good	4.186 \| good	0.125 \| good
2026-09-29T07:00:00.000Z	27 \| good	4.508 \| good	7.384 \| good	20.995 \| good	0.281 \| good	6.219 \| good	0.137 \| good
2026-09-29T08:00:00.000Z	27 \| good	5.053 \| good	7.444 \| good	20.899 \| good	0.33 \| good	7.088 \| good	0.145 \| good
2026-09-29T09:00:00.000Z	27 \| good	5.358 \| good	8.05 \| good	24.416 \| good	0.355 \| good	6.328 \| good	0.149 \| good
2026-09-29T10:00:00.000Z	38 \| good	7.094 \| good	10.186 \| good	26.385 \| good	0.348 \| good	5.385 \| good	0.149 \| good
2026-09-29T11:00:00.000Z	38 \| good	7.478 \| good	11.02 \| good	31.618 \| good	0.403 \| good	4.603 \| good	0.154 \| good
2026-09-29T12:00:00.000Z	49 \| good	8.775 \| good	12.713 \| good	33.752 \| good	0.455 \| good	4.868 \| good	0.153 \| good
2026-09-29T13:00:00.000Z	49 \| good	9.482 \| good	14.154 \| good	37.063 \| good	0.524 \| good	4.57 \| good	0.159 \| good
2026-09-29T14:00:00.000Z	54 \| moderate	10.708 \| good	15.078 \| good	38.951 \| good	0.538 \| good	4.598 \| good	0.164 \| good
2026-09-29T15:00:00.000Z	52 \| moderate	10.37 \| good	14.434 \| good	39.728 \| good	0.539 \| good	4.747 \| good	0.164 \| good
2026-09-29T16:00:00.000Z	49 \| good	8.808 \| good	12.899 \| good	38.972 \| good	0.492 \| good	5.427 \| good	0.16 \| good
2026-09-29T17:00:00.000Z	56 \| moderate	12.323 \| fine	14.962 \| good	36.326 \| good	0.508 \| good	7.264 \| good	0.169 \| good
2026-09-29T18:00:00.000Z	60 \| moderate	14.333 \| fine	16.362 \| good	33.356 \| good	0.539 \| good	9.337 \| good	0.179 \| good
2026-09-29T19:00:00.000Z	60 \| moderate	13.973 \| fine	19.276 \| good	29.282 \| good	0.638 \| good	10.496 \| good	0.188 \| good
2026-09-29T20:00:00.000Z	64 \| moderate	15.913 \| fine	20.755 \| good	28.874 \| good	0.707 \| good	10.151 \| good	0.189 \| good
2026-09-29T21:00:00.000Z	66 \| moderate	16.507 \| fine	19.297 \| good	26.332 \| good	0.566 \| good	9.947 \| good	0.173 \| good
2026-09-29T22:00:00.000Z	56 \| moderate	12.426 \| fine	17.114 \| good	25.261 \| good	0.44 \| good	8.498 \| good	0.164 \| good
2026-09-29T23:00:00.000Z	52 \| moderate	9.65 \| good	12.997 \| good	29.397 \| good	0.4 \| good	7.334 \| good	0.152 \| good
2026-09-30T00:00:00.000Z	38 \| good	7.146 \| good	10.563 \| good	33.266 \| good	0.356 \| good	6.142 \| good	0.145 \| good
2026-09-30T01:00:00.000Z	33 \| good	5.919 \| good	9.6 \| good	32.178 \| good	0.304 \| good	5.042 \| good	0.136 \| good
2026-09-30T02:00:00.000Z	29 \| good	4.821 \| good	8.817 \| good	31.448 \| good	0.306 \| good	4.371 \| good	0.129 \| good
2026-09-30T03:00:00.000Z	30 \| good	4.441 \| good	9.025 \| good	32.05 \| good	0.326 \| good	3.7 \| good	0.127 \| good
2026-09-30T04:00:00.000Z	30 \| good	4.58 \| good	10.458 \| good	31.703 \| good	0.342 \| good	3.367 \| good	0.127 \| good
2026-09-30T05:00:00.000Z	30 \| good	4.85 \| good	10.807 \| good	31.636 \| good	0.307 \| good	3.615 \| good	0.127 \| good
2026-09-30T06:00:00.000Z	30 \| good	5.496 \| good	11.27 \| good	31.569 \| good	0.265 \| good	4.429 \| good	0.129 \| good
2026-09-30T07:00:00.000Z	33 \| good	6.034 \| good	11.091 \| good	28.613 \| good	0.295 \| good	6.69 \| good	0.134 \| good
2026-09-30T08:00:00.000Z	27 \| good	5.395 \| good	8.762 \| good	25.89 \| good	0.32 \| good	8.164 \| good	0.134 \| good
2026-09-30T09:00:00.000Z	27 \| good	4.938 \| good	7.567 \| good	26.012 \| good	0.276 \| good	7.908 \| good	0.135 \| good
2026-09-30T10:00:00.000Z	27 \| good	5.127 \| good	7.391 \| good	29.389 \| good	0.217 \| good	6.172 \| good	0.129 \| good
2026-09-30T11:00:00.000Z	33 \| good	5.753 \| good	7.41 \| good	31.65 \| good	0.189 \| good	3.771 \| good	0.12 \| good
2026-09-30T12:00:00.000Z	30 \| good	4.971 \| good	7.306 \| good	31.807 \| good	0.162 \| good	3.09 \| good	0.113 \| good
2026-09-30T13:00:00.000Z	31 \| good	4.827 \| good	7.359 \| good	33.197 \| good	0.141 \| good	2.892 \| good	0.113 \| good
2026-09-30T14:00:00.000Z	32 \| good	4.113 \| good	7.156 \| good	35.018 \| good	0.126 \| good	2.616 \| good	0.114 \| good
2026-09-30T15:00:00.000Z	31 \| good	4.086 \| good	7.876 \| good	33.969 \| good	0.132 \| good	3.17 \| good	0.115 \| good
2026-09-30T16:00:00.000Z	30 \| good	4.514 \| good	7.923 \| good	32.37 \| good	0.159 \| good	4.327 \| good	0.116 \| good
2026-09-30T17:00:00.000Z	28 \| good	4.715 \| good	8.748 \| good	29.641 \| good	0.202 \| good	6.826 \| good	0.127 \| good
2026-09-30T18:00:00.000Z	33 \| good	5.617 \| good	10.56 \| good	24.296 \| good	0.313 \| good	10.635 \| good	0.138 \| good
2026-09-30T19:00:00.000Z	38 \| good	6.512 \| good	12.265 \| good	21.682 \| good	0.396 \| good	11.906 \| good	0.141 \| good
2026-09-30T20:00:00.000Z	38 \| good	7.07 \| good	12.8 \| good	21.029 \| good	0.424 \| good	11.677 \| good	0.143 \| good
2026-09-30T21:00:00.000Z	38 \| good	7.224 \| good	14.422 \| good	20.669 \| good	0.48 \| good	10.468 \| good	0.145 \| good
2026-09-30T22:00:00.000Z	38 \| good	7.428 \| good	15.633 \| good	19.001 \| good	0.505 \| good	10.742 \| good	0.148 \| good

Welwyn Garden City

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Welwyn Garden City, Hertfordshire air quality map: Track AQI near you

0.31ppm

How accurate is Hertfordshire, UK air quality data?

Air quality data and pollutant measurements for Hertfordshire, UK adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.

Source: Ambee Data Sources

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Frequently asked questions

How often is the air quality data for Welwyn Garden City, Hertfordshire updated?

The air quality for Welwyn Garden City, Hertfordshire is updated every hour.

When was the worst air quality at Welwyn Garden City, Hertfordshire in the last 24 hrs?

The worst air quality in Welwyn Garden City, Hertfordshire in the last 24 hours was observed at 11:00:00 on 2026-09-27.

When was the best air quality at Welwyn Garden City, Hertfordshire in the last 24 hrs?

In the last 24 hrs, the best air quality in Welwyn Garden City, Hertfordshire was observed at 11:00:00 on 2026-09-28.

What is the current air quality in Welwyn Garden City, Hertfordshire?

The current air quality in Welwyn Garden City, Hertfordshire is 31, categorized as Good based on real-time data.

What pollutant is the most common in Welwyn Garden City, Hertfordshire?

The most common pollutant in Welwyn Garden City, Hertfordshire is O3.

What should I do if the air quality in Welwyn Garden City, Hertfordshire is poor?

If the air quality in Welwyn Garden City, Hertfordshire is poor, consider staying indoors and wearing a mask to protect yourself.

What is the current concentration of PM_2.5 in Welwyn Garden City, Hertfordshire?

The current PM_2.5 concentration at Welwyn Garden City, Hertfordshire is 4.247 μg/m³.

What is the current concentration of PM₁₀ in Welwyn Garden City, Hertfordshire?

The current PM₁₀ concentration at Welwyn Garden City, Hertfordshire is 14.08 μg/m³.

What is the current concentration of carbon monoxide (CO) in Welwyn Garden City, Hertfordshire?

The current carbon monoxide (CO) concentration at Welwyn Garden City, Hertfordshire is 0.312 ppm.

What is the current concentration of sulfur dioxide (SO₂) in Welwyn Garden City, Hertfordshire?

The current sulfur dioxide (SO₂) concentration at Welwyn Garden City, Hertfordshire is 0.592 ppb.

What is the current concentration of ozone (O₃) in Welwyn Garden City, Hertfordshire?

The current ozone (O₃) concentration at Welwyn Garden City, Hertfordshire is 32.6 ppm.

What is the current concentration of nitrogen dioxide (NO₂) in Welwyn Garden City, Hertfordshire?

The current nitrogen dioxide (NO₂) concentration at Welwyn Garden City, Hertfordshire is 5.354 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-09-26T23:00:00.000Z	22 \| good	4.371 \| good	14.036 \| good	20.487 \| good	0.644 \| good	19.077 \| good	0.297 \| good
2026-09-27T00:00:00.000Z	33 \| good	5.7 \| good	15.807 \| good	20.034 \| good	0.698 \| good	17.318 \| good	0.226 \| good
2026-09-27T01:00:00.000Z	44 \| good	7.982 \| good	17.394 \| good	18.623 \| good	0.732 \| good	25.405 \| good	0.229 \| good
2026-09-27T02:00:00.000Z	38 \| good	7.38 \| good	19.403 \| good	17.987 \| good	0.599 \| good	33.384 \| good	0.212 \| good
2026-09-27T03:00:00.000Z	44 \| good	7.527 \| good	17.276 \| good	9.423 \| good	0.663 \| good	20.48 \| good	0.217 \| good
2026-09-27T04:00:00.000Z	52 \| moderate	9.787 \| good	17.134 \| good	14.592 \| good	0.596 \| good	21.823 \| good	0.205 \| good
2026-09-27T05:00:00.000Z	38 \| good	6.598 \| good	15.38 \| good	14.49 \| good	0.665 \| good	32.12 \| good	0.007 \| good
2026-09-27T06:00:00.000Z	52 \| moderate	10.33 \| good	22.488 \| good	15.882 \| good	0.598 \| good	13.23 \| good	0.006 \| good
2026-09-27T07:00:00.000Z	38 \| good	6.828 \| good	18.055 \| good	24.432 \| good	0.596 \| good	13.362 \| good	0.006 \| good
2026-09-27T08:00:00.000Z	44 \| good	8.181 \| good	26.4 \| good	20.969 \| good	0.594 \| good	15.298 \| good	0.007 \| good
2026-09-27T09:00:00.000Z	52 \| moderate	9.698 \| good	20.591 \| good	16.969 \| good	0.521 \| good	11.596 \| good	0.006 \| good
2026-09-27T10:00:00.000Z	52 \| moderate	9.962 \| good	29.6 \| good	19.542 \| good	0.521 \| good	15.489 \| good	0.008 \| good
2026-09-27T11:00:00.000Z	49 \| good	9.417 \| good	16.774 \| good	24.677 \| good	0.665 \| good	14.007 \| good	0.006 \| good
2026-09-27T12:00:00.000Z	52 \| moderate	9.569 \| good	18.697 \| good	22.844 \| good	0.738 \| good	7.394 \| good	0.006 \| good
2026-09-27T13:00:00.000Z	49 \| good	8.643 \| good	25.628 \| good	27.29 \| good	0.738 \| good	13.66 \| good	0.006 \| good
2026-09-27T14:00:00.000Z	49 \| good	9.16 \| good	20.281 \| good	28.808 \| good	0.737 \| good	14.601 \| good	0.006 \| good
2026-09-27T15:00:00.000Z	56 \| moderate	11.976 \| good	26.141 \| good	24.248 \| good	0.738 \| good	12.36 \| good	0.006 \| good
2026-09-27T16:00:00.000Z	52 \| moderate	9.719 \| good	18.594 \| good	31.863 \| good	0.665 \| good	8.311 \| good	0.006 \| good
2026-09-27T17:00:00.000Z	58 \| moderate	13.293 \| fine	19.593 \| good	34.755 \| good	0.738 \| good	12.651 \| good	0.006 \| good
2026-09-27T18:00:00.000Z	58 \| moderate	13.19 \| fine	20.855 \| good	34.905 \| good	0.666 \| good	9.566 \| good	0.007 \| good
2026-09-27T19:00:00.000Z	52 \| moderate	9.753 \| good	24.408 \| good	35.743 \| good	0.665 \| good	10.268 \| good	0.008 \| good
2026-09-27T20:00:00.000Z	54 \| moderate	11.383 \| good	23.391 \| good	30.093 \| good	0.594 \| good	15.287 \| good	0.009 \| good
2026-09-27T21:00:00.000Z	52 \| moderate	10.098 \| good	17.653 \| good	35.033 \| good	0.598 \| good	9.731 \| good	0.012 \| good
2026-09-27T22:00:00.000Z	38 \| good	7.194 \| good	21.917 \| good	29.201 \| good	0.51 \| good	7.544 \| good	0.01 \| good
2026-09-27T23:00:00.000Z	38 \| good	6.857 \| good	19.477 \| good	34.044 \| good	0.595 \| good	6.396 \| good	0.011 \| good
2026-09-28T00:00:00.000Z	33 \| good	6.492 \| good	17.273 \| good	33.29 \| good	0.687 \| good	5.321 \| good	0.255 \| good
2026-09-28T01:00:00.000Z	27 \| good	4.648 \| good	14.922 \| good	26.354 \| good	0.726 \| good	5.573 \| good	0.18 \| good
2026-09-28T02:00:00.000Z	33 \| good	5.922 \| good	13.784 \| good	25.189 \| good	0.595 \| good	5.937 \| good	0.226 \| good
2026-09-28T03:00:00.000Z	33 \| good	5.775 \| good	15.763 \| good	26.963 \| good	0.729 \| good	5.938 \| good	0.214 \| good
2026-09-28T04:00:00.000Z	33 \| good	5.869 \| good	18.104 \| good	25.908 \| good	0.727 \| good	7.413 \| good	0.218 \| good
2026-09-28T05:00:00.000Z	33 \| good	5.954 \| good	12.585 \| good	22.893 \| good	0.596 \| good	8.192 \| good	0.197 \| good
2026-09-28T06:00:00.000Z	27 \| good	5.397 \| good	14.86 \| good	22.727 \| good	0.598 \| good	5.603 \| good	0.21 \| good
2026-09-28T07:00:00.000Z	27 \| good	5.293 \| good	9.901 \| good	12.906 \| good	0.596 \| good	13.105 \| good	0.279 \| good
2026-09-28T08:00:00.000Z	27 \| good	5.444 \| good	11.015 \| good	19.395 \| good	0.593 \| good	10.991 \| good	0.264 \| good
2026-09-28T09:00:00.000Z	27 \| good	4.824 \| good	10.824 \| good	23.255 \| good	0.667 \| good	12.119 \| good	0.235 \| good
2026-09-28T10:00:00.000Z	22 \| good	3.805 \| good	8.964 \| good	18.376 \| good	0.666 \| good	11.401 \| good	0.221 \| good
2026-09-28T11:00:00.000Z	16 \| good	3.488 \| good	12.08 \| good	10.735 \| good	0.735 \| good	8.333 \| good	0.212 \| good
2026-09-28T12:00:00.000Z	27 \| good	4.855 \| good	11.884 \| good	19.081 \| good	0.738 \| good	9.142 \| good	0.188 \| good
2026-09-28T13:00:00.000Z	27 \| good	4.711 \| good	10.139 \| good	14.613 \| good	0.585 \| good	10.709 \| good	0.165 \| good
2026-09-28T14:00:00.000Z	22 \| good	4.406 \| good	8.545 \| good	20.552 \| good	0.511 \| good	6.636 \| good	0.162 \| good
2026-09-28T15:00:00.000Z	22 \| good	3.955 \| good	11.027 \| good	24.225 \| good	0.591 \| good	9.511 \| good	0.156 \| good
2026-09-28T16:00:00.000Z	22 \| good	3.997 \| good	9.701 \| good	22.493 \| good	0.736 \| good	7.452 \| good	0.153 \| good
2026-09-28T17:00:00.000Z	24 \| good	3.599 \| good	7.374 \| good	25.882 \| good	0.887 \| good	5.686 \| good	0.169 \| good
2026-09-28T18:00:00.000Z	27 \| good	3.6 \| good	12.68 \| good	28.516 \| good	0.743 \| good	6.636 \| good	0.216 \| good
2026-09-28T19:00:00.000Z	28 \| good	3.499 \| good	11.076 \| good	30.209 \| good	0.663 \| good	10.533 \| good	0.253 \| good
2026-09-28T20:00:00.000Z	27 \| good	4.906 \| good	12.428 \| good	28.046 \| good	0.589 \| good	8.187 \| good	0.324 \| good
2026-09-28T21:00:00.000Z	25 \| good	4.186 \| good	10.432 \| good	27.42 \| good	0.594 \| good	5.304 \| good	0.312 \| good
2026-09-28T22:00:00.000Z	27 \| good	5.04 \| good	11.38 \| good	25.816 \| good	0.588 \| good	5.972 \| good	0.352 \| good
2026-09-28T22:00:00.000Z	31 \| good	4.247 \| good	14.08 \| good	32.6 \| good	0.592 \| good	5.354 \| good	0.312 \| good
2026-09-28T23:00:00.000Z	27 \| good	4.635 \| good	8.048 \| good	23.379 \| good	0.257 \| good	4.981 \| good	0.141 \| good
2026-09-29T00:00:00.000Z	24 \| good	4.268 \| good	7.332 \| good	26.153 \| good	0.203 \| good	4.041 \| good	0.132 \| good
2026-09-29T01:00:00.000Z	24 \| good	3.876 \| good	7.004 \| good	26.245 \| good	0.166 \| good	3.542 \| good	0.127 \| good
2026-09-29T02:00:00.000Z	24 \| good	3.563 \| good	6.805 \| good	26.085 \| good	0.164 \| good	3.152 \| good	0.123 \| good
2026-09-29T03:00:00.000Z	24 \| good	3.624 \| good	7.556 \| good	25.68 \| good	0.155 \| good	3.084 \| good	0.121 \| good
2026-09-29T04:00:00.000Z	24 \| good	3.907 \| good	6.958 \| good	26.179 \| good	0.155 \| good	3.228 \| good	0.122 \| good
2026-09-29T05:00:00.000Z	24 \| good	4.354 \| good	7.273 \| good	26.186 \| good	0.164 \| good	3.166 \| good	0.121 \| good
2026-09-29T06:00:00.000Z	23 \| good	4.191 \| good	6.738 \| good	24.99 \| good	0.192 \| good	4.186 \| good	0.125 \| good
2026-09-29T07:00:00.000Z	27 \| good	4.508 \| good	7.384 \| good	20.995 \| good	0.281 \| good	6.219 \| good	0.137 \| good
2026-09-29T08:00:00.000Z	27 \| good	5.053 \| good	7.444 \| good	20.899 \| good	0.33 \| good	7.088 \| good	0.145 \| good
2026-09-29T09:00:00.000Z	27 \| good	5.358 \| good	8.05 \| good	24.416 \| good	0.355 \| good	6.328 \| good	0.149 \| good
2026-09-29T10:00:00.000Z	38 \| good	7.094 \| good	10.186 \| good	26.385 \| good	0.348 \| good	5.385 \| good	0.149 \| good
2026-09-29T11:00:00.000Z	38 \| good	7.478 \| good	11.02 \| good	31.618 \| good	0.403 \| good	4.603 \| good	0.154 \| good
2026-09-29T12:00:00.000Z	49 \| good	8.775 \| good	12.713 \| good	33.752 \| good	0.455 \| good	4.868 \| good	0.153 \| good
2026-09-29T13:00:00.000Z	49 \| good	9.482 \| good	14.154 \| good	37.063 \| good	0.524 \| good	4.57 \| good	0.159 \| good
2026-09-29T14:00:00.000Z	54 \| moderate	10.708 \| good	15.078 \| good	38.951 \| good	0.538 \| good	4.598 \| good	0.164 \| good
2026-09-29T15:00:00.000Z	52 \| moderate	10.37 \| good	14.434 \| good	39.728 \| good	0.539 \| good	4.747 \| good	0.164 \| good
2026-09-29T16:00:00.000Z	49 \| good	8.808 \| good	12.899 \| good	38.972 \| good	0.492 \| good	5.427 \| good	0.16 \| good
2026-09-29T17:00:00.000Z	56 \| moderate	12.323 \| fine	14.962 \| good	36.326 \| good	0.508 \| good	7.264 \| good	0.169 \| good
2026-09-29T18:00:00.000Z	60 \| moderate	14.333 \| fine	16.362 \| good	33.356 \| good	0.539 \| good	9.337 \| good	0.179 \| good
2026-09-29T19:00:00.000Z	60 \| moderate	13.973 \| fine	19.276 \| good	29.282 \| good	0.638 \| good	10.496 \| good	0.188 \| good
2026-09-29T20:00:00.000Z	64 \| moderate	15.913 \| fine	20.755 \| good	28.874 \| good	0.707 \| good	10.151 \| good	0.189 \| good
2026-09-29T21:00:00.000Z	66 \| moderate	16.507 \| fine	19.297 \| good	26.332 \| good	0.566 \| good	9.947 \| good	0.173 \| good
2026-09-29T22:00:00.000Z	56 \| moderate	12.426 \| fine	17.114 \| good	25.261 \| good	0.44 \| good	8.498 \| good	0.164 \| good
2026-09-29T23:00:00.000Z	52 \| moderate	9.65 \| good	12.997 \| good	29.397 \| good	0.4 \| good	7.334 \| good	0.152 \| good
2026-09-30T00:00:00.000Z	38 \| good	7.146 \| good	10.563 \| good	33.266 \| good	0.356 \| good	6.142 \| good	0.145 \| good
2026-09-30T01:00:00.000Z	33 \| good	5.919 \| good	9.6 \| good	32.178 \| good	0.304 \| good	5.042 \| good	0.136 \| good
2026-09-30T02:00:00.000Z	29 \| good	4.821 \| good	8.817 \| good	31.448 \| good	0.306 \| good	4.371 \| good	0.129 \| good
2026-09-30T03:00:00.000Z	30 \| good	4.441 \| good	9.025 \| good	32.05 \| good	0.326 \| good	3.7 \| good	0.127 \| good
2026-09-30T04:00:00.000Z	30 \| good	4.58 \| good	10.458 \| good	31.703 \| good	0.342 \| good	3.367 \| good	0.127 \| good
2026-09-30T05:00:00.000Z	30 \| good	4.85 \| good	10.807 \| good	31.636 \| good	0.307 \| good	3.615 \| good	0.127 \| good
2026-09-30T06:00:00.000Z	30 \| good	5.496 \| good	11.27 \| good	31.569 \| good	0.265 \| good	4.429 \| good	0.129 \| good
2026-09-30T07:00:00.000Z	33 \| good	6.034 \| good	11.091 \| good	28.613 \| good	0.295 \| good	6.69 \| good	0.134 \| good
2026-09-30T08:00:00.000Z	27 \| good	5.395 \| good	8.762 \| good	25.89 \| good	0.32 \| good	8.164 \| good	0.134 \| good
2026-09-30T09:00:00.000Z	27 \| good	4.938 \| good	7.567 \| good	26.012 \| good	0.276 \| good	7.908 \| good	0.135 \| good
2026-09-30T10:00:00.000Z	27 \| good	5.127 \| good	7.391 \| good	29.389 \| good	0.217 \| good	6.172 \| good	0.129 \| good
2026-09-30T11:00:00.000Z	33 \| good	5.753 \| good	7.41 \| good	31.65 \| good	0.189 \| good	3.771 \| good	0.12 \| good
2026-09-30T12:00:00.000Z	30 \| good	4.971 \| good	7.306 \| good	31.807 \| good	0.162 \| good	3.09 \| good	0.113 \| good
2026-09-30T13:00:00.000Z	31 \| good	4.827 \| good	7.359 \| good	33.197 \| good	0.141 \| good	2.892 \| good	0.113 \| good
2026-09-30T14:00:00.000Z	32 \| good	4.113 \| good	7.156 \| good	35.018 \| good	0.126 \| good	2.616 \| good	0.114 \| good
2026-09-30T15:00:00.000Z	31 \| good	4.086 \| good	7.876 \| good	33.969 \| good	0.132 \| good	3.17 \| good	0.115 \| good
2026-09-30T16:00:00.000Z	30 \| good	4.514 \| good	7.923 \| good	32.37 \| good	0.159 \| good	4.327 \| good	0.116 \| good
2026-09-30T17:00:00.000Z	28 \| good	4.715 \| good	8.748 \| good	29.641 \| good	0.202 \| good	6.826 \| good	0.127 \| good
2026-09-30T18:00:00.000Z	33 \| good	5.617 \| good	10.56 \| good	24.296 \| good	0.313 \| good	10.635 \| good	0.138 \| good
2026-09-30T19:00:00.000Z	38 \| good	6.512 \| good	12.265 \| good	21.682 \| good	0.396 \| good	11.906 \| good	0.141 \| good
2026-09-30T20:00:00.000Z	38 \| good	7.07 \| good	12.8 \| good	21.029 \| good	0.424 \| good	11.677 \| good	0.143 \| good
2026-09-30T21:00:00.000Z	38 \| good	7.224 \| good	14.422 \| good	20.669 \| good	0.48 \| good	10.468 \| good	0.145 \| good
2026-09-30T22:00:00.000Z	38 \| good	7.428 \| good	15.633 \| good	19.001 \| good	0.505 \| good	10.742 \| good	0.148 \| good

Welwyn Garden City, Hertfordshire live air quality index now

Major air pollutants in Welwyn Garden City, Hertfordshire

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Welwyn Garden City, Hertfordshire air quality map: Track AQI near you

Air quality in nearby cities

Hatfield, Hertfordshire

Hertford, Hertfordshire

Harpenden, Hertfordshire

St Albans, Hertfordshire

Stevenage, Hertfordshire

Potters Bar, Hertfordshire

How accurate is Hertfordshire, UK air quality data?

Air quality levels in UK

Frequently asked questions

How often is the air quality data for Welwyn Garden City, Hertfordshire updated?

When was the worst air quality at Welwyn Garden City, Hertfordshire in the last 24 hrs?

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What is the current air quality in Welwyn Garden City, Hertfordshire?

What pollutant is the most common in Welwyn Garden City, Hertfordshire?

What should I do if the air quality in Welwyn Garden City, Hertfordshire is poor?

What is the current concentration of PM2.5 in Welwyn Garden City, Hertfordshire?

What is the current concentration of PM10 in Welwyn Garden City, Hertfordshire?

What is the current concentration of carbon monoxide (CO) in Welwyn Garden City, Hertfordshire?

What is the current concentration of sulfur dioxide (SO2) in Welwyn Garden City, Hertfordshire?

What is the current concentration of ozone (O3) in Welwyn Garden City, Hertfordshire?

What is the current concentration of nitrogen dioxide (NO2) in Welwyn Garden City, Hertfordshire?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the current concentration of PM_2.5 in Welwyn Garden City, Hertfordshire?

What is the current concentration of PM₁₀ in Welwyn Garden City, Hertfordshire?

What is the current concentration of sulfur dioxide (SO₂) in Welwyn Garden City, Hertfordshire?

What is the current concentration of ozone (O₃) in Welwyn Garden City, Hertfordshire?

What is the current concentration of nitrogen dioxide (NO₂) in Welwyn Garden City, Hertfordshire?