What is the sulfur dioxide (SO2) level in Highlands Ranch, Colorado at the moment?

Currently, Highlands Ranch, Colorado has a sulfur dioxide (SO2) concentration of 1.483 ppb.

What is the ozone (O3) level in Highlands Ranch, Colorado at the moment?

The current ozone (O3) level in Highlands Ranch, Colorado at the moment is 24.573 ppm.

What is the nitrogen dioxide (NO2) level in Highlands Ranch, Colorado at the moment?

Nitrogen dioxide (NO2) level in Highlands Ranch, Colorado at the moment is 27.744 ppb.

Live air quality index in Highlands Ranch, Colorado today

Q: What is the PM2.5 level in Highlands Ranch, Colorado at the moment?

PM2.5 levels in Highlands Ranch, Colorado are currently 6.001 μg/m3.

Q: What is the PM10 level in Highlands Ranch, Colorado at the moment?

The PM10 concentration in Highlands Ranch, Colorado is 17.45 μg/m3 at the moment.

Stay updated with real-time air quality in Highlands Ranch, Colorado 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

Highlands Ranch, Colorado

Last updated: ... (Local time)

Major air pollutants in Highlands Ranch, Colorado

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

6.00 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

17.45 μg/m³

155

255

425

605+

Ozone (O₃)

24.57 ppb

201

201+

Sulfur Dioxide (SO₂)

1.48 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

27.74 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.44 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

Highlands Ranch, Colorado

Get Live Pollen Counts

Highlands Ranch, Colorado

Scroll To Air Quality Map

Track live Highlands Ranch, Colorado air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-10-20T23:00:00.000Z	43 \| good	5.403 \| good	23.63 \| good	46.144 \| good	0.923 \| good	10.93 \| good	0.235 \| good
2026-10-21T00:00:00.000Z	40 \| good	4.555 \| good	18.358 \| good	43.192 \| good	0.864 \| good	11.334 \| good	0.194 \| good
2026-10-21T01:00:00.000Z	34 \| good	4.059 \| good	17.625 \| good	36.889 \| good	0.78 \| good	28.774 \| good	0.534 \| good
2026-10-21T02:00:00.000Z	42 \| good	3.993 \| good	18.417 \| good	34.641 \| good	1.023 \| good	44.367 \| good	0.813 \| good
2026-10-21T03:00:00.000Z	31 \| good	2.863 \| good	11.889 \| good	33.249 \| good	0.503 \| good	22.828 \| good	0.219 \| good
2026-10-21T04:00:00.000Z	33 \| good	4.857 \| good	18.107 \| good	30.742 \| good	0.986 \| good	34.65 \| good	0.662 \| good
2026-10-21T05:00:00.000Z	30 \| good	4.505 \| good	18.222 \| good	31.169 \| good	0.844 \| good	32.247 \| good	0.49 \| good
2026-10-21T06:00:00.000Z	29 \| good	4.373 \| good	17.929 \| good	30.597 \| good	1.119 \| good	27.263 \| good	0.525 \| good
2026-10-21T07:00:00.000Z	29 \| good	4.281 \| good	16.391 \| good	30.725 \| good	1.276 \| good	21.163 \| good	0.353 \| good
2026-10-21T08:00:00.000Z	26 \| good	4.069 \| good	16.874 \| good	28.433 \| good	1.002 \| good	17.624 \| good	0.317 \| good
2026-10-21T09:00:00.000Z	29 \| good	4.184 \| good	17.559 \| good	30.502 \| good	0.928 \| good	16.689 \| good	0.279 \| good
2026-10-21T10:00:00.000Z	28 \| good	5.153 \| good	20.445 \| good	30.181 \| good	0.885 \| good	21.188 \| good	0.315 \| good
2026-10-21T11:00:00.000Z	33 \| good	5.845 \| good	18.92 \| good	26.397 \| good	0.836 \| good	21.522 \| good	0.449 \| good
2026-10-21T12:00:00.000Z	33 \| good	6.36 \| good	20.084 \| good	30.227 \| good	0.808 \| good	16.24 \| good	0.537 \| good
2026-10-21T13:00:00.000Z	28 \| good	5.253 \| good	20.431 \| good	29.978 \| good	1.081 \| good	17.915 \| good	0.617 \| good
2026-10-21T14:00:00.000Z	27 \| good	5.316 \| good	20.759 \| good	28.896 \| good	1.479 \| good	19.213 \| good	0.514 \| good
2026-10-21T15:00:00.000Z	28 \| good	5.3 \| good	23.051 \| good	29.998 \| good	1.506 \| good	21.379 \| good	0.568 \| good
2026-10-21T16:00:00.000Z	33 \| good	6.118 \| good	25.266 \| good	27.36 \| good	1.601 \| good	20.367 \| good	0.439 \| good
2026-10-21T17:00:00.000Z	35 \| good	5.532 \| good	23.463 \| good	37.719 \| good	1.194 \| good	13.271 \| good	0.336 \| good
2026-10-21T18:00:00.000Z	35 \| good	4.972 \| good	20.654 \| good	38.229 \| good	1.176 \| good	13.306 \| good	0.336 \| good
2026-10-21T19:00:00.000Z	40 \| good	3.654 \| good	16.176 \| good	43.12 \| good	0.777 \| good	7.309 \| good	0.188 \| good
2026-10-21T20:00:00.000Z	44 \| good	3.265 \| good	15.016 \| good	47.563 \| good	0.709 \| good	7.788 \| good	0.181 \| good
2026-10-21T21:00:00.000Z	46 \| good	3.123 \| good	13.869 \| good	50.451 \| good	0.502 \| good	6.85 \| good	0.144 \| good
2026-10-21T22:00:00.000Z	46 \| good	3.216 \| good	13.937 \| good	49.542 \| good	0.499 \| good	7.591 \| good	0.196 \| good
2026-10-21T23:00:00.000Z	48 \| good	2.997 \| good	13.107 \| good	51.515 \| good	0.395 \| good	9.29 \| good	0.196 \| good
2026-10-22T00:00:00.000Z	43 \| good	2.946 \| good	12.768 \| good	46.177 \| good	0.774 \| good	12.257 \| good	0.257 \| good
2026-10-22T01:00:00.000Z	38 \| good	2.548 \| good	11.636 \| good	41.496 \| good	0.566 \| good	17.048 \| good	0.397 \| good
2026-10-22T02:00:00.000Z	37 \| good	1.984 \| good	8.575 \| good	40.348 \| good	0.331 \| good	13.711 \| good	0.342 \| good
2026-10-22T03:00:00.000Z	31 \| good	0.94 \| good	3.783 \| good	32.985 \| good	0.308 \| good	19.104 \| good	0.207 \| good
2026-10-22T04:00:00.000Z	33 \| good	1.47 \| good	5.92 \| good	36.024 \| good	0.889 \| good	9.026 \| good	0.3 \| good
2026-10-22T05:00:00.000Z	34 \| good	1.46 \| good	6.256 \| good	36.741 \| good	0.739 \| good	8.03 \| good	0.268 \| good
2026-10-22T06:00:00.000Z	31 \| good	1.225 \| good	4.953 \| good	34.166 \| good	0.568 \| good	8.112 \| good	0.194 \| good
2026-10-22T07:00:00.000Z	31 \| good	0.988 \| good	3.874 \| good	33.57 \| good	0.65 \| good	7.678 \| good	0.143 \| good
2026-10-22T08:00:00.000Z	31 \| good	0.829 \| good	3.315 \| good	32.737 \| good	0.568 \| good	8.591 \| good	0.144 \| good
2026-10-22T09:00:00.000Z	31 \| good	0.65 \| good	2.71 \| good	32.51 \| good	0.859 \| good	6.892 \| good	0.112 \| good
2026-10-22T10:00:00.000Z	29 \| good	0.642 \| good	2.826 \| good	30.854 \| good	0.649 \| good	10.414 \| good	0.176 \| good
2026-10-22T11:00:00.000Z	25 \| good	0.699 \| good	3.064 \| good	27.449 \| good	0.401 \| good	9.709 \| good	0.229 \| good
2026-10-22T12:00:00.000Z	25 \| good	1.356 \| good	5.701 \| good	27.191 \| good	0.605 \| good	16.091 \| good	0.229 \| good
2026-10-22T13:00:00.000Z	23 \| good	1.775 \| good	7.259 \| good	23.885 \| good	0.59 \| good	24.06 \| good	0.5 \| good
2026-10-22T14:00:00.000Z	24 \| good	2.178 \| good	9.296 \| good	22.72 \| good	0.656 \| good	24.972 \| good	0.439 \| good
2026-10-22T15:00:00.000Z	25 \| good	2.845 \| good	12.583 \| good	20.11 \| good	0.902 \| good	25.821 \| good	0.699 \| good
2026-10-22T16:00:00.000Z	31 \| good	3.946 \| good	17.509 \| good	21.672 \| good	1.267 \| good	32.708 \| good	0.561 \| good
2026-10-22T17:00:00.000Z	27 \| good	4.609 \| good	19.375 \| good	23.973 \| good	1.299 \| good	28.97 \| good	0.482 \| good
2026-10-22T18:00:00.000Z	25 \| good	4.347 \| good	18.765 \| good	27.146 \| good	1.194 \| good	20.309 \| good	0.36 \| good
2026-10-22T19:00:00.000Z	27 \| good	3.313 \| good	14.589 \| good	29.392 \| good	0.921 \| good	15.352 \| good	0.352 \| good
2026-10-22T20:00:00.000Z	27 \| good	3.062 \| good	13.246 \| good	28.59 \| good	1.079 \| good	23.856 \| good	0.387 \| good
2026-10-22T21:00:00.000Z	26 \| good	3.672 \| good	14.903 \| good	28.014 \| good	1.487 \| good	25.421 \| good	0.438 \| good
2026-10-22T22:00:00.000Z	33 \| good	6.001 \| good	17.45 \| good	24.573 \| good	1.483 \| good	27.744 \| good	0.444 \| good
2026-10-22T23:00:00.000Z	31 \| good	1.81 \| good	7.556 \| good	33.7 \| good	0.285 \| good	1.508 \| good	0.098 \| good
2026-10-23T00:00:00.000Z	27 \| good	1.171 \| good	4.675 \| good	28.88 \| good	0.305 \| good	5.668 \| good	0.126 \| good
2026-10-23T01:00:00.000Z	24 \| good	0.509 \| good	1.983 \| good	26.433 \| good	0.362 \| good	11.78 \| good	0.165 \| good
2026-10-23T02:00:00.000Z	26 \| good	0.604 \| good	2.02 \| good	28.259 \| good	0.361 \| good	12.631 \| good	0.174 \| good
2026-10-23T03:00:00.000Z	32 \| good	0.436 \| good	1.716 \| good	35.476 \| good	0.332 \| good	12.563 \| good	0.171 \| good
2026-10-23T04:00:00.000Z	34 \| good	0.521 \| good	2 \| good	36.844 \| good	0.305 \| good	11.585 \| good	0.164 \| good
2026-10-23T05:00:00.000Z	31 \| good	0.199 \| good	0.361 \| good	33.74 \| good	0.277 \| good	10.195 \| good	0.157 \| good
2026-10-23T06:00:00.000Z	32 \| good	0.292 \| good	1.078 \| good	34.504 \| good	0.24 \| good	8.215 \| good	0.147 \| good
2026-10-23T07:00:00.000Z	29 \| good	0.278 \| good	1.078 \| good	31.282 \| good	0.206 \| good	6.006 \| good	0.136 \| good
2026-10-23T08:00:00.000Z	29 \| good	0.376 \| good	1.22 \| good	30.629 \| good	0.189 \| good	4.075 \| good	0.124 \| good
2026-10-23T09:00:00.000Z	29 \| good	0.417 \| good	1.714 \| good	30.705 \| good	0.184 \| good	2.658 \| good	0.115 \| good
2026-10-23T10:00:00.000Z	29 \| good	0.748 \| good	2.89 \| good	31.423 \| good	0.18 \| good	1.943 \| good	0.111 \| good
2026-10-23T11:00:00.000Z	30 \| good	0.718 \| good	2.734 \| good	31.965 \| good	0.174 \| good	1.646 \| good	0.11 \| good
2026-10-23T12:00:00.000Z	31 \| good	1.122 \| good	4.582 \| good	33.715 \| good	0.167 \| good	1.633 \| good	0.11 \| good
2026-10-23T13:00:00.000Z	29 \| good	1.381 \| good	5.738 \| good	31.28 \| good	0.166 \| good	2.259 \| good	0.114 \| good
2026-10-23T14:00:00.000Z	30 \| good	1.478 \| good	6.027 \| good	31.982 \| good	0.17 \| good	3.162 \| good	0.122 \| good
2026-10-23T15:00:00.000Z	32 \| good	0.363 \| good	1.147 \| good	35.483 \| good	0.166 \| good	2.757 \| good	0.124 \| good
2026-10-23T16:00:00.000Z	38 \| good	0.349 \| good	1.174 \| good	41.312 \| good	0.15 \| good	1.462 \| good	0.115 \| good
2026-10-23T17:00:00.000Z	42 \| good	0.098 \| good	0.11 \| good	45.125 \| good	0.141 \| good	0.806 \| good	0.107 \| good
2026-10-23T18:00:00.000Z	44 \| good	0.113 \| good	0.078 \| good	47.095 \| good	0.129 \| good	0.52 \| good	0.103 \| good
2026-10-23T19:00:00.000Z	45 \| good	0.717 \| good	2.624 \| good	49.328 \| good	0.118 \| good	0.434 \| good	0.1 \| good
2026-10-23T20:00:00.000Z	46 \| good	1.407 \| good	5.578 \| good	49.805 \| good	0.109 \| good	0.415 \| good	0.098 \| good
2026-10-23T21:00:00.000Z	46 \| good	1.726 \| good	7.389 \| good	50.393 \| good	0.103 \| good	0.435 \| good	0.097 \| good
2026-10-23T22:00:00.000Z	46 \| good	1.312 \| good	5.101 \| good	50.415 \| good	0.101 \| good	0.508 \| good	0.096 \| good
2026-10-23T23:00:00.000Z	45 \| good	0.616 \| good	2.179 \| good	48.826 \| good	0.102 \| good	0.698 \| good	0.096 \| good
2026-10-24T00:00:00.000Z	39 \| good	0.493 \| good	1.964 \| good	42.481 \| good	0.126 \| good	3.356 \| good	0.114 \| good
2026-10-24T01:00:00.000Z	33 \| good	0.541 \| good	2.032 \| good	36.252 \| good	0.173 \| good	7.987 \| good	0.139 \| good
2026-10-24T02:00:00.000Z	35 \| good	0.605 \| good	2.156 \| good	38.27 \| good	0.199 \| good	10.436 \| good	0.151 \| good
2026-10-24T03:00:00.000Z	30 \| good	0.802 \| good	2.812 \| good	32.345 \| good	0.203 \| good	10.948 \| good	0.152 \| good
2026-10-24T04:00:00.000Z	27 \| good	0.746 \| good	2.896 \| good	29.368 \| good	0.198 \| good	10.64 \| good	0.149 \| good
2026-10-24T05:00:00.000Z	26 \| good	0.828 \| good	3.164 \| good	27.788 \| good	0.195 \| good	10.924 \| good	0.15 \| good
2026-10-24T06:00:00.000Z	26 \| good	1.992 \| good	8.39 \| good	28.338 \| good	0.178 \| good	10.355 \| good	0.149 \| good
2026-10-24T07:00:00.000Z	25 \| good	2.424 \| good	10.292 \| good	27.319 \| good	0.156 \| good	9.145 \| good	0.145 \| good
2026-10-24T08:00:00.000Z	27 \| good	4.793 \| good	20.991 \| good	28.615 \| good	0.145 \| good	8.506 \| good	0.139 \| good
2026-10-24T09:00:00.000Z	54 \| moderate	11.08 \| good	49.695 \| good	29.677 \| good	0.144 \| good	8.757 \| good	0.138 \| good
2026-10-24T10:00:00.000Z	67 \| moderate	17.876 \| fine	78.882 \| fine	28.267 \| good	0.17 \| good	9.554 \| good	0.141 \| good
2026-10-24T11:00:00.000Z	79 \| moderate	23.583 \| fine	103.236 \| fine	29.817 \| good	0.208 \| good	9.927 \| good	0.143 \| good
2026-10-24T12:00:00.000Z	84 \| moderate	27.328 \| fine	118.482 \| fine	31.833 \| good	0.24 \| good	9.551 \| good	0.143 \| good
2026-10-24T13:00:00.000Z	84 \| moderate	26.717 \| fine	116.745 \| fine	32.02 \| good	0.278 \| good	10.631 \| good	0.149 \| good
2026-10-24T14:00:00.000Z	73 \| moderate	21.357 \| fine	94.157 \| fine	33.637 \| good	0.324 \| good	11.621 \| good	0.159 \| good
2026-10-24T15:00:00.000Z	54 \| moderate	10.51 \| good	46.87 \| good	37.898 \| good	0.299 \| good	4.621 \| good	0.131 \| good
2026-10-24T16:00:00.000Z	49 \| good	9.309 \| good	41.311 \| good	37.053 \| good	0.339 \| good	3.21 \| good	0.129 \| good
2026-10-24T17:00:00.000Z	49 \| good	9.044 \| good	39.758 \| good	34.819 \| good	0.395 \| good	2.744 \| good	0.131 \| good
2026-10-24T18:00:00.000Z	38 \| good	6.561 \| good	28.959 \| good	35.627 \| good	0.444 \| good	2.365 \| good	0.133 \| good
2026-10-24T19:00:00.000Z	36 \| good	6.012 \| good	26.445 \| good	39.099 \| good	0.496 \| good	2.285 \| good	0.135 \| good
2026-10-24T20:00:00.000Z	38 \| good	7.047 \| good	31.282 \| good	40.125 \| good	0.531 \| good	2.231 \| good	0.136 \| good
2026-10-24T21:00:00.000Z	49 \| good	9.241 \| good	40.853 \| good	40.743 \| good	0.556 \| good	2.314 \| good	0.138 \| good
2026-10-24T22:00:00.000Z	49 \| good	8.793 \| good	39.13 \| good	40.779 \| good	0.579 \| good	2.461 \| good	0.14 \| good

Highlands Ranch

Get reliable air quality data to drive your business

Highlands Ranch, Colorado air quality map: Stay updated on AQI near you

0.46ppm

How accurate is Colorado, USA air quality data?

Air quality and pollutant data for Colorado, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.

Source: Ambee Data Sources

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Frequently asked questions

How often is air quality information updated for Highlands Ranch, Colorado?

The air quality information for Highlands Ranch, Colorado is updated every hour for accuracy.

What time in the last 24 hours was the air quality in Highlands Ranch, Colorado at its worst?

In the past 24 hours, the air quality in Highlands Ranch, Colorado was at its worst at 11:00:00 on 2026-10-21.

When did Highlands Ranch, Colorado experience the best air quality in the last 24 hours?

In the last 24 hours, the best air quality in Highlands Ranch, Colorado was observed at 01:00:00 on 2026-10-22.

What is the AQI in Highlands Ranch, Colorado right now?

As of now, the AQI in Highlands Ranch, Colorado is 33, indicating Good conditions.

What is the most common type of pollution in Highlands Ranch, Colorado?

Highlands Ranch, Colorado air has the highest levels of PM2.5.

What should I do in case of poor air quality in Highlands Ranch, Colorado?

Poor air quality in Highlands Ranch, Colorado means it's advisable to stay indoors and wear a mask for your protection.

What is the PM_2.5 level in Highlands Ranch, Colorado at the moment?

PM_2.5 levels in Highlands Ranch, Colorado are currently 6.001 μg/m³.

What is the PM₁₀ level in Highlands Ranch, Colorado at the moment?

The PM₁₀ concentration in Highlands Ranch, Colorado is 17.45 μg/m³ at the moment.

What is the carbon monoxide (CO) level in Highlands Ranch, Colorado at the moment?

The current carbon monoxide (CO) concentration in Highlands Ranch, Colorado is 0.444 ppm.

What is the sulfur dioxide (SO₂) level in Highlands Ranch, Colorado at the moment?

Currently, Highlands Ranch, Colorado has a sulfur dioxide (SO₂) concentration of 1.483 ppb.

What is the ozone (O₃) level in Highlands Ranch, Colorado at the moment?

The current ozone (O₃) level in Highlands Ranch, Colorado at the moment is 24.573 ppm.

What is the nitrogen dioxide (NO₂) level in Highlands Ranch, Colorado at the moment?

Nitrogen dioxide (NO₂) level in Highlands Ranch, Colorado at the moment is 27.744 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-10-20T23:00:00.000Z	43 \| good	5.403 \| good	23.63 \| good	46.144 \| good	0.923 \| good	10.93 \| good	0.235 \| good
2026-10-21T00:00:00.000Z	40 \| good	4.555 \| good	18.358 \| good	43.192 \| good	0.864 \| good	11.334 \| good	0.194 \| good
2026-10-21T01:00:00.000Z	34 \| good	4.059 \| good	17.625 \| good	36.889 \| good	0.78 \| good	28.774 \| good	0.534 \| good
2026-10-21T02:00:00.000Z	42 \| good	3.993 \| good	18.417 \| good	34.641 \| good	1.023 \| good	44.367 \| good	0.813 \| good
2026-10-21T03:00:00.000Z	31 \| good	2.863 \| good	11.889 \| good	33.249 \| good	0.503 \| good	22.828 \| good	0.219 \| good
2026-10-21T04:00:00.000Z	33 \| good	4.857 \| good	18.107 \| good	30.742 \| good	0.986 \| good	34.65 \| good	0.662 \| good
2026-10-21T05:00:00.000Z	30 \| good	4.505 \| good	18.222 \| good	31.169 \| good	0.844 \| good	32.247 \| good	0.49 \| good
2026-10-21T06:00:00.000Z	29 \| good	4.373 \| good	17.929 \| good	30.597 \| good	1.119 \| good	27.263 \| good	0.525 \| good
2026-10-21T07:00:00.000Z	29 \| good	4.281 \| good	16.391 \| good	30.725 \| good	1.276 \| good	21.163 \| good	0.353 \| good
2026-10-21T08:00:00.000Z	26 \| good	4.069 \| good	16.874 \| good	28.433 \| good	1.002 \| good	17.624 \| good	0.317 \| good
2026-10-21T09:00:00.000Z	29 \| good	4.184 \| good	17.559 \| good	30.502 \| good	0.928 \| good	16.689 \| good	0.279 \| good
2026-10-21T10:00:00.000Z	28 \| good	5.153 \| good	20.445 \| good	30.181 \| good	0.885 \| good	21.188 \| good	0.315 \| good
2026-10-21T11:00:00.000Z	33 \| good	5.845 \| good	18.92 \| good	26.397 \| good	0.836 \| good	21.522 \| good	0.449 \| good
2026-10-21T12:00:00.000Z	33 \| good	6.36 \| good	20.084 \| good	30.227 \| good	0.808 \| good	16.24 \| good	0.537 \| good
2026-10-21T13:00:00.000Z	28 \| good	5.253 \| good	20.431 \| good	29.978 \| good	1.081 \| good	17.915 \| good	0.617 \| good
2026-10-21T14:00:00.000Z	27 \| good	5.316 \| good	20.759 \| good	28.896 \| good	1.479 \| good	19.213 \| good	0.514 \| good
2026-10-21T15:00:00.000Z	28 \| good	5.3 \| good	23.051 \| good	29.998 \| good	1.506 \| good	21.379 \| good	0.568 \| good
2026-10-21T16:00:00.000Z	33 \| good	6.118 \| good	25.266 \| good	27.36 \| good	1.601 \| good	20.367 \| good	0.439 \| good
2026-10-21T17:00:00.000Z	35 \| good	5.532 \| good	23.463 \| good	37.719 \| good	1.194 \| good	13.271 \| good	0.336 \| good
2026-10-21T18:00:00.000Z	35 \| good	4.972 \| good	20.654 \| good	38.229 \| good	1.176 \| good	13.306 \| good	0.336 \| good
2026-10-21T19:00:00.000Z	40 \| good	3.654 \| good	16.176 \| good	43.12 \| good	0.777 \| good	7.309 \| good	0.188 \| good
2026-10-21T20:00:00.000Z	44 \| good	3.265 \| good	15.016 \| good	47.563 \| good	0.709 \| good	7.788 \| good	0.181 \| good
2026-10-21T21:00:00.000Z	46 \| good	3.123 \| good	13.869 \| good	50.451 \| good	0.502 \| good	6.85 \| good	0.144 \| good
2026-10-21T22:00:00.000Z	46 \| good	3.216 \| good	13.937 \| good	49.542 \| good	0.499 \| good	7.591 \| good	0.196 \| good
2026-10-21T23:00:00.000Z	48 \| good	2.997 \| good	13.107 \| good	51.515 \| good	0.395 \| good	9.29 \| good	0.196 \| good
2026-10-22T00:00:00.000Z	43 \| good	2.946 \| good	12.768 \| good	46.177 \| good	0.774 \| good	12.257 \| good	0.257 \| good
2026-10-22T01:00:00.000Z	38 \| good	2.548 \| good	11.636 \| good	41.496 \| good	0.566 \| good	17.048 \| good	0.397 \| good
2026-10-22T02:00:00.000Z	37 \| good	1.984 \| good	8.575 \| good	40.348 \| good	0.331 \| good	13.711 \| good	0.342 \| good
2026-10-22T03:00:00.000Z	31 \| good	0.94 \| good	3.783 \| good	32.985 \| good	0.308 \| good	19.104 \| good	0.207 \| good
2026-10-22T04:00:00.000Z	33 \| good	1.47 \| good	5.92 \| good	36.024 \| good	0.889 \| good	9.026 \| good	0.3 \| good
2026-10-22T05:00:00.000Z	34 \| good	1.46 \| good	6.256 \| good	36.741 \| good	0.739 \| good	8.03 \| good	0.268 \| good
2026-10-22T06:00:00.000Z	31 \| good	1.225 \| good	4.953 \| good	34.166 \| good	0.568 \| good	8.112 \| good	0.194 \| good
2026-10-22T07:00:00.000Z	31 \| good	0.988 \| good	3.874 \| good	33.57 \| good	0.65 \| good	7.678 \| good	0.143 \| good
2026-10-22T08:00:00.000Z	31 \| good	0.829 \| good	3.315 \| good	32.737 \| good	0.568 \| good	8.591 \| good	0.144 \| good
2026-10-22T09:00:00.000Z	31 \| good	0.65 \| good	2.71 \| good	32.51 \| good	0.859 \| good	6.892 \| good	0.112 \| good
2026-10-22T10:00:00.000Z	29 \| good	0.642 \| good	2.826 \| good	30.854 \| good	0.649 \| good	10.414 \| good	0.176 \| good
2026-10-22T11:00:00.000Z	25 \| good	0.699 \| good	3.064 \| good	27.449 \| good	0.401 \| good	9.709 \| good	0.229 \| good
2026-10-22T12:00:00.000Z	25 \| good	1.356 \| good	5.701 \| good	27.191 \| good	0.605 \| good	16.091 \| good	0.229 \| good
2026-10-22T13:00:00.000Z	23 \| good	1.775 \| good	7.259 \| good	23.885 \| good	0.59 \| good	24.06 \| good	0.5 \| good
2026-10-22T14:00:00.000Z	24 \| good	2.178 \| good	9.296 \| good	22.72 \| good	0.656 \| good	24.972 \| good	0.439 \| good
2026-10-22T15:00:00.000Z	25 \| good	2.845 \| good	12.583 \| good	20.11 \| good	0.902 \| good	25.821 \| good	0.699 \| good
2026-10-22T16:00:00.000Z	31 \| good	3.946 \| good	17.509 \| good	21.672 \| good	1.267 \| good	32.708 \| good	0.561 \| good
2026-10-22T17:00:00.000Z	27 \| good	4.609 \| good	19.375 \| good	23.973 \| good	1.299 \| good	28.97 \| good	0.482 \| good
2026-10-22T18:00:00.000Z	25 \| good	4.347 \| good	18.765 \| good	27.146 \| good	1.194 \| good	20.309 \| good	0.36 \| good
2026-10-22T19:00:00.000Z	27 \| good	3.313 \| good	14.589 \| good	29.392 \| good	0.921 \| good	15.352 \| good	0.352 \| good
2026-10-22T20:00:00.000Z	27 \| good	3.062 \| good	13.246 \| good	28.59 \| good	1.079 \| good	23.856 \| good	0.387 \| good
2026-10-22T21:00:00.000Z	26 \| good	3.672 \| good	14.903 \| good	28.014 \| good	1.487 \| good	25.421 \| good	0.438 \| good
2026-10-22T22:00:00.000Z	33 \| good	6.001 \| good	17.45 \| good	24.573 \| good	1.483 \| good	27.744 \| good	0.444 \| good
2026-10-22T23:00:00.000Z	31 \| good	1.81 \| good	7.556 \| good	33.7 \| good	0.285 \| good	1.508 \| good	0.098 \| good
2026-10-23T00:00:00.000Z	27 \| good	1.171 \| good	4.675 \| good	28.88 \| good	0.305 \| good	5.668 \| good	0.126 \| good
2026-10-23T01:00:00.000Z	24 \| good	0.509 \| good	1.983 \| good	26.433 \| good	0.362 \| good	11.78 \| good	0.165 \| good
2026-10-23T02:00:00.000Z	26 \| good	0.604 \| good	2.02 \| good	28.259 \| good	0.361 \| good	12.631 \| good	0.174 \| good
2026-10-23T03:00:00.000Z	32 \| good	0.436 \| good	1.716 \| good	35.476 \| good	0.332 \| good	12.563 \| good	0.171 \| good
2026-10-23T04:00:00.000Z	34 \| good	0.521 \| good	2 \| good	36.844 \| good	0.305 \| good	11.585 \| good	0.164 \| good
2026-10-23T05:00:00.000Z	31 \| good	0.199 \| good	0.361 \| good	33.74 \| good	0.277 \| good	10.195 \| good	0.157 \| good
2026-10-23T06:00:00.000Z	32 \| good	0.292 \| good	1.078 \| good	34.504 \| good	0.24 \| good	8.215 \| good	0.147 \| good
2026-10-23T07:00:00.000Z	29 \| good	0.278 \| good	1.078 \| good	31.282 \| good	0.206 \| good	6.006 \| good	0.136 \| good
2026-10-23T08:00:00.000Z	29 \| good	0.376 \| good	1.22 \| good	30.629 \| good	0.189 \| good	4.075 \| good	0.124 \| good
2026-10-23T09:00:00.000Z	29 \| good	0.417 \| good	1.714 \| good	30.705 \| good	0.184 \| good	2.658 \| good	0.115 \| good
2026-10-23T10:00:00.000Z	29 \| good	0.748 \| good	2.89 \| good	31.423 \| good	0.18 \| good	1.943 \| good	0.111 \| good
2026-10-23T11:00:00.000Z	30 \| good	0.718 \| good	2.734 \| good	31.965 \| good	0.174 \| good	1.646 \| good	0.11 \| good
2026-10-23T12:00:00.000Z	31 \| good	1.122 \| good	4.582 \| good	33.715 \| good	0.167 \| good	1.633 \| good	0.11 \| good
2026-10-23T13:00:00.000Z	29 \| good	1.381 \| good	5.738 \| good	31.28 \| good	0.166 \| good	2.259 \| good	0.114 \| good
2026-10-23T14:00:00.000Z	30 \| good	1.478 \| good	6.027 \| good	31.982 \| good	0.17 \| good	3.162 \| good	0.122 \| good
2026-10-23T15:00:00.000Z	32 \| good	0.363 \| good	1.147 \| good	35.483 \| good	0.166 \| good	2.757 \| good	0.124 \| good
2026-10-23T16:00:00.000Z	38 \| good	0.349 \| good	1.174 \| good	41.312 \| good	0.15 \| good	1.462 \| good	0.115 \| good
2026-10-23T17:00:00.000Z	42 \| good	0.098 \| good	0.11 \| good	45.125 \| good	0.141 \| good	0.806 \| good	0.107 \| good
2026-10-23T18:00:00.000Z	44 \| good	0.113 \| good	0.078 \| good	47.095 \| good	0.129 \| good	0.52 \| good	0.103 \| good
2026-10-23T19:00:00.000Z	45 \| good	0.717 \| good	2.624 \| good	49.328 \| good	0.118 \| good	0.434 \| good	0.1 \| good
2026-10-23T20:00:00.000Z	46 \| good	1.407 \| good	5.578 \| good	49.805 \| good	0.109 \| good	0.415 \| good	0.098 \| good
2026-10-23T21:00:00.000Z	46 \| good	1.726 \| good	7.389 \| good	50.393 \| good	0.103 \| good	0.435 \| good	0.097 \| good
2026-10-23T22:00:00.000Z	46 \| good	1.312 \| good	5.101 \| good	50.415 \| good	0.101 \| good	0.508 \| good	0.096 \| good
2026-10-23T23:00:00.000Z	45 \| good	0.616 \| good	2.179 \| good	48.826 \| good	0.102 \| good	0.698 \| good	0.096 \| good
2026-10-24T00:00:00.000Z	39 \| good	0.493 \| good	1.964 \| good	42.481 \| good	0.126 \| good	3.356 \| good	0.114 \| good
2026-10-24T01:00:00.000Z	33 \| good	0.541 \| good	2.032 \| good	36.252 \| good	0.173 \| good	7.987 \| good	0.139 \| good
2026-10-24T02:00:00.000Z	35 \| good	0.605 \| good	2.156 \| good	38.27 \| good	0.199 \| good	10.436 \| good	0.151 \| good
2026-10-24T03:00:00.000Z	30 \| good	0.802 \| good	2.812 \| good	32.345 \| good	0.203 \| good	10.948 \| good	0.152 \| good
2026-10-24T04:00:00.000Z	27 \| good	0.746 \| good	2.896 \| good	29.368 \| good	0.198 \| good	10.64 \| good	0.149 \| good
2026-10-24T05:00:00.000Z	26 \| good	0.828 \| good	3.164 \| good	27.788 \| good	0.195 \| good	10.924 \| good	0.15 \| good
2026-10-24T06:00:00.000Z	26 \| good	1.992 \| good	8.39 \| good	28.338 \| good	0.178 \| good	10.355 \| good	0.149 \| good
2026-10-24T07:00:00.000Z	25 \| good	2.424 \| good	10.292 \| good	27.319 \| good	0.156 \| good	9.145 \| good	0.145 \| good
2026-10-24T08:00:00.000Z	27 \| good	4.793 \| good	20.991 \| good	28.615 \| good	0.145 \| good	8.506 \| good	0.139 \| good
2026-10-24T09:00:00.000Z	54 \| moderate	11.08 \| good	49.695 \| good	29.677 \| good	0.144 \| good	8.757 \| good	0.138 \| good
2026-10-24T10:00:00.000Z	67 \| moderate	17.876 \| fine	78.882 \| fine	28.267 \| good	0.17 \| good	9.554 \| good	0.141 \| good
2026-10-24T11:00:00.000Z	79 \| moderate	23.583 \| fine	103.236 \| fine	29.817 \| good	0.208 \| good	9.927 \| good	0.143 \| good
2026-10-24T12:00:00.000Z	84 \| moderate	27.328 \| fine	118.482 \| fine	31.833 \| good	0.24 \| good	9.551 \| good	0.143 \| good
2026-10-24T13:00:00.000Z	84 \| moderate	26.717 \| fine	116.745 \| fine	32.02 \| good	0.278 \| good	10.631 \| good	0.149 \| good
2026-10-24T14:00:00.000Z	73 \| moderate	21.357 \| fine	94.157 \| fine	33.637 \| good	0.324 \| good	11.621 \| good	0.159 \| good
2026-10-24T15:00:00.000Z	54 \| moderate	10.51 \| good	46.87 \| good	37.898 \| good	0.299 \| good	4.621 \| good	0.131 \| good
2026-10-24T16:00:00.000Z	49 \| good	9.309 \| good	41.311 \| good	37.053 \| good	0.339 \| good	3.21 \| good	0.129 \| good
2026-10-24T17:00:00.000Z	49 \| good	9.044 \| good	39.758 \| good	34.819 \| good	0.395 \| good	2.744 \| good	0.131 \| good
2026-10-24T18:00:00.000Z	38 \| good	6.561 \| good	28.959 \| good	35.627 \| good	0.444 \| good	2.365 \| good	0.133 \| good
2026-10-24T19:00:00.000Z	36 \| good	6.012 \| good	26.445 \| good	39.099 \| good	0.496 \| good	2.285 \| good	0.135 \| good
2026-10-24T20:00:00.000Z	38 \| good	7.047 \| good	31.282 \| good	40.125 \| good	0.531 \| good	2.231 \| good	0.136 \| good
2026-10-24T21:00:00.000Z	49 \| good	9.241 \| good	40.853 \| good	40.743 \| good	0.556 \| good	2.314 \| good	0.138 \| good
2026-10-24T22:00:00.000Z	49 \| good	8.793 \| good	39.13 \| good	40.779 \| good	0.579 \| good	2.461 \| good	0.14 \| good

Live air quality index in Highlands Ranch, Colorado today

Major air pollutants in Highlands Ranch, Colorado

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

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Highlands Ranch, Colorado air quality map: Stay updated on AQI near you

Air quality in nearby cities

Lone Tree, Colorado

Greenwood Village, Colorado

Littleton, Colorado

Centennial, Colorado

Columbine, Colorado

Castle Pines, Colorado

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Frequently asked questions

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What is the carbon monoxide (CO) level in Highlands Ranch, Colorado at the moment?

What is the sulfur dioxide (SO2) level in Highlands Ranch, Colorado at the moment?

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What is the nitrogen dioxide (NO2) level in Highlands Ranch, Colorado at the moment?

Particulate Matter_2.5 (PM_2.5)

Particulate Matter₁₀ (PM₁₀)

Ozone (O₃)

Sulfur Dioxide (SO₂)

Nitrogen Dioxide (NO₂)

What is the PM_2.5 level in Highlands Ranch, Colorado at the moment?

What is the PM₁₀ level in Highlands Ranch, Colorado at the moment?

What is the sulfur dioxide (SO₂) level in Highlands Ranch, Colorado at the moment?

What is the ozone (O₃) level in Highlands Ranch, Colorado at the moment?

What is the nitrogen dioxide (NO₂) level in Highlands Ranch, Colorado at the moment?