What are the current PM10 levels at Castle Rock, Colorado?

The current PM10 levels in Castle Rock, Colorado are 11.708 μg/m3.

What are the current sulfur dioxide (SO2) levels at Castle Rock, Colorado?

The current sulfur dioxide (SO2) levels in Castle Rock, Colorado are 1.04 ppb.

What are the current ozone (O3) levels at Castle Rock, Colorado?

The current ozone (O3) levels at Castle Rock, Colorado is 29.895 ppm.

What are the current nitrogen dioxide (NO2) levels at Castle Rock, Colorado?

The current nitrogen dioxide (NO2) levels at Castle Rock, Colorado is 23.223 ppb.

Real-time air quality index in Castle Rock, Colorado today

Q: What are the current PM2.5 levels in Castle Rock, Colorado?

The measured PM2.5 levels in Castle Rock, Colorado at present are 2.778 μg/m3.

Stay updated with real-time air quality in Castle Rock, 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

Castle Rock, Colorado

Last updated: ... (Local time)

Common air pollutants in Castle Rock, Colorado

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

2.78 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

11.71 μg/m³

155

255

425

605+

Ozone (O₃)

29.89 ppb

201

201+

Sulfur Dioxide (SO₂)

1.04 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

23.22 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.34 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

High

Castle Rock, Colorado

Get Live Pollen Counts

Castle Rock, Colorado

Scroll To Air Quality Map

Track live Castle Rock, Colorado air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-10-20T22:00:00.000Z	44 \| good	7.159 \| good	30.198 \| good	47.056 \| good	1.016 \| good	10.248 \| good	0.213 \| good
2026-10-20T23:00:00.000Z	44 \| good	5.469 \| good	19.953 \| good	46.652 \| good	0.882 \| good	10.575 \| good	0.221 \| good
2026-10-21T00:00:00.000Z	41 \| good	3.116 \| good	16.895 \| good	43.964 \| good	0.819 \| good	5.863 \| good	0.19 \| good
2026-10-21T01:00:00.000Z	42 \| good	2.535 \| good	13.514 \| good	45.017 \| good	0.727 \| good	11.598 \| good	0.486 \| good
2026-10-21T02:00:00.000Z	38 \| good	2.954 \| good	11.755 \| good	40.704 \| good	0.955 \| good	14.776 \| good	0.711 \| good
2026-10-21T03:00:00.000Z	38 \| good	1.489 \| good	5.942 \| good	41.013 \| good	0.476 \| good	16.03 \| good	0.187 \| good
2026-10-21T04:00:00.000Z	32 \| good	3.734 \| good	12.378 \| good	34.874 \| good	0.944 \| good	11.172 \| good	0.579 \| good
2026-10-21T05:00:00.000Z	32 \| good	3.959 \| good	16.278 \| good	35.485 \| good	0.795 \| good	12.647 \| good	0.44 \| good
2026-10-21T06:00:00.000Z	31 \| good	4.313 \| good	17.351 \| good	34.391 \| good	1.032 \| good	15.27 \| good	0.48 \| good
2026-10-21T07:00:00.000Z	33 \| good	4.511 \| good	13.117 \| good	35.711 \| good	1.182 \| good	15.066 \| good	0.333 \| good
2026-10-21T08:00:00.000Z	33 \| good	4.286 \| good	17.454 \| good	36.095 \| good	0.943 \| good	12.851 \| good	0.301 \| good
2026-10-21T09:00:00.000Z	32 \| good	4.238 \| good	16.579 \| good	35.152 \| good	0.877 \| good	12.979 \| good	0.266 \| good
2026-10-21T10:00:00.000Z	30 \| good	5.011 \| good	12.593 \| good	32.394 \| good	0.827 \| good	15.597 \| good	0.29 \| good
2026-10-21T11:00:00.000Z	33 \| good	5.745 \| good	6.452 \| good	31.438 \| good	0.788 \| good	16.435 \| good	0.41 \| good
2026-10-21T12:00:00.000Z	33 \| good	6.39 \| good	8.443 \| good	30.974 \| good	0.778 \| good	8.184 \| good	0.482 \| good
2026-10-21T13:00:00.000Z	33 \| good	3.242 \| good	11.796 \| good	35.527 \| good	1.06 \| good	12.295 \| good	0.559 \| good
2026-10-21T14:00:00.000Z	30 \| good	4.322 \| good	11.789 \| good	31.588 \| good	1.489 \| good	12.933 \| good	0.495 \| good
2026-10-21T15:00:00.000Z	33 \| good	6.162 \| good	15.674 \| good	33.045 \| good	1.515 \| good	13.831 \| good	0.515 \| good
2026-10-21T16:00:00.000Z	33 \| good	6.347 \| good	27.307 \| good	34.221 \| good	1.534 \| good	10.697 \| good	0.402 \| good
2026-10-21T17:00:00.000Z	35 \| good	5.563 \| good	23.418 \| good	38.125 \| good	1.165 \| good	10.105 \| good	0.307 \| good
2026-10-21T18:00:00.000Z	31 \| good	5.152 \| good	21.65 \| good	32.681 \| good	1.188 \| good	11.225 \| good	0.307 \| good
2026-10-21T19:00:00.000Z	40 \| good	4.471 \| good	22.346 \| good	42.863 \| good	0.747 \| good	6.887 \| good	0.181 \| good
2026-10-21T20:00:00.000Z	42 \| good	3.53 \| good	18.88 \| good	45.405 \| good	0.67 \| good	7.719 \| good	0.169 \| good
2026-10-21T21:00:00.000Z	43 \| good	2.942 \| good	13.495 \| good	46.421 \| good	0.462 \| good	6.803 \| good	0.136 \| good
2026-10-21T22:00:00.000Z	42 \| good	3.832 \| good	18.185 \| good	45.154 \| good	0.457 \| good	7.324 \| good	0.184 \| good
2026-10-21T23:00:00.000Z	47 \| good	3.186 \| good	12.005 \| good	51.434 \| good	0.378 \| good	9.086 \| good	0.193 \| good
2026-10-22T00:00:00.000Z	44 \| good	3.45 \| good	6.907 \| good	47.091 \| good	0.75 \| good	6.86 \| good	0.256 \| good
2026-10-22T01:00:00.000Z	42 \| good	2.948 \| good	17.686 \| good	44.596 \| good	0.569 \| good	8.255 \| good	0.374 \| good
2026-10-22T02:00:00.000Z	37 \| good	2.618 \| good	7.313 \| good	39.797 \| good	0.316 \| good	8.692 \| good	0.344 \| good
2026-10-22T03:00:00.000Z	35 \| good	1.075 \| good	4.77 \| good	37.797 \| good	0.255 \| good	11.391 \| good	0.165 \| good
2026-10-22T04:00:00.000Z	34 \| good	1.403 \| good	6.445 \| good	36.826 \| good	0.842 \| good	7.053 \| good	0.312 \| good
2026-10-22T05:00:00.000Z	34 \| good	1.379 \| good	6.348 \| good	36.792 \| good	0.752 \| good	7.952 \| good	0.27 \| good
2026-10-22T06:00:00.000Z	32 \| good	1.2 \| good	5.007 \| good	35.135 \| good	0.548 \| good	9.284 \| good	0.19 \| good
2026-10-22T07:00:00.000Z	32 \| good	1.284 \| good	4.604 \| good	35.198 \| good	0.655 \| good	5.286 \| good	0.143 \| good
2026-10-22T08:00:00.000Z	31 \| good	0.673 \| good	3.015 \| good	33.482 \| good	0.581 \| good	7.055 \| good	0.145 \| good
2026-10-22T09:00:00.000Z	31 \| good	0.523 \| good	3.134 \| good	32.877 \| good	0.862 \| good	6.958 \| good	0.116 \| good
2026-10-22T10:00:00.000Z	30 \| good	0.837 \| good	2.882 \| good	32.245 \| good	0.59 \| good	9.965 \| good	0.164 \| good
2026-10-22T11:00:00.000Z	29 \| good	0.643 \| good	3.081 \| good	31.328 \| good	0.42 \| good	9.62 \| good	0.196 \| good
2026-10-22T12:00:00.000Z	30 \| good	1.111 \| good	5.58 \| good	31.878 \| good	0.569 \| good	15.65 \| good	0.196 \| good
2026-10-22T13:00:00.000Z	31 \| good	1.404 \| good	5.587 \| good	33.806 \| good	0.543 \| good	22.466 \| good	0.406 \| good
2026-10-22T14:00:00.000Z	25 \| good	2.017 \| good	6.748 \| good	26.817 \| good	0.651 \| good	24.303 \| good	0.394 \| good
2026-10-22T15:00:00.000Z	23 \| good	2.186 \| good	8.992 \| good	24.676 \| good	0.895 \| good	16.712 \| good	0.622 \| good
2026-10-22T16:00:00.000Z	21 \| good	3.218 \| good	10.086 \| good	23.345 \| good	1.188 \| good	19.326 \| good	0.503 \| good
2026-10-22T17:00:00.000Z	22 \| good	3.828 \| good	20.6 \| good	22.565 \| good	1.282 \| good	16.722 \| good	0.437 \| good
2026-10-22T18:00:00.000Z	25 \| good	4.018 \| good	15.118 \| good	26.888 \| good	1.143 \| good	14.782 \| good	0.336 \| good
2026-10-22T19:00:00.000Z	27 \| good	3.266 \| good	13.575 \| good	28.976 \| good	0.886 \| good	15.052 \| good	0.324 \| good
2026-10-22T20:00:00.000Z	28 \| good	2.778 \| good	11.708 \| good	29.895 \| good	1.04 \| good	23.223 \| good	0.345 \| good
2026-10-22T21:00:00.000Z	28 \| good	2.778 \| good	11.708 \| good	29.895 \| good	1.04 \| good	23.223 \| good	0.345 \| good
2026-10-22T22:00:00.000Z	36 \| good	0.366 \| good	1.321 \| good	38.811 \| good	0.311 \| good	1.086 \| good	0.098 \| good
2026-10-22T23:00:00.000Z	37 \| good	0.374 \| good	1.251 \| good	39.786 \| good	0.302 \| good	1.267 \| good	0.101 \| good
2026-10-23T00:00:00.000Z	36 \| good	0.392 \| good	1.336 \| good	38.547 \| good	0.305 \| good	3.943 \| good	0.119 \| good
2026-10-23T01:00:00.000Z	31 \| good	0.365 \| good	1.274 \| good	34.122 \| good	0.333 \| good	8.063 \| good	0.148 \| good
2026-10-23T02:00:00.000Z	34 \| good	0.298 \| good	1 \| good	37.452 \| good	0.337 \| good	8.331 \| good	0.155 \| good
2026-10-23T03:00:00.000Z	38 \| good	0.236 \| good	1 \| good	41.019 \| good	0.316 \| good	8.205 \| good	0.15 \| good
2026-10-23T04:00:00.000Z	37 \| good	0.246 \| good	1 \| good	40.454 \| good	0.301 \| good	7.952 \| good	0.145 \| good
2026-10-23T05:00:00.000Z	35 \| good	0.264 \| good	1 \| good	37.97 \| good	0.29 \| good	7.415 \| good	0.141 \| good
2026-10-23T06:00:00.000Z	35 \| good	0.265 \| good	1 \| good	37.823 \| good	0.274 \| good	6.381 \| good	0.134 \| good
2026-10-23T07:00:00.000Z	32 \| good	0.275 \| good	1 \| good	34.71 \| good	0.26 \| good	4.947 \| good	0.126 \| good
2026-10-23T08:00:00.000Z	30 \| good	0.299 \| good	1 \| good	32.051 \| good	0.256 \| good	3.563 \| good	0.118 \| good
2026-10-23T09:00:00.000Z	30 \| good	0.3 \| good	1 \| good	31.646 \| good	0.25 \| good	2.504 \| good	0.112 \| good
2026-10-23T10:00:00.000Z	31 \| good	0.578 \| good	2 \| good	32.705 \| good	0.24 \| good	2.001 \| good	0.11 \| good
2026-10-23T11:00:00.000Z	30 \| good	0.329 \| good	1 \| good	32.485 \| good	0.23 \| good	1.807 \| good	0.11 \| good
2026-10-23T12:00:00.000Z	31 \| good	0.729 \| good	2.834 \| good	33.662 \| good	0.22 \| good	1.799 \| good	0.111 \| good
2026-10-23T13:00:00.000Z	31 \| good	0.764 \| good	2.867 \| good	33.01 \| good	0.216 \| good	2.271 \| good	0.115 \| good
2026-10-23T14:00:00.000Z	30 \| good	1.079 \| good	4.631 \| good	32.214 \| good	0.219 \| good	2.952 \| good	0.122 \| good
2026-10-23T15:00:00.000Z	33 \| good	1.116 \| good	4.629 \| good	35.997 \| good	0.212 \| good	2.55 \| good	0.124 \| good
2026-10-23T16:00:00.000Z	39 \| good	0.458 \| good	1.798 \| good	42.114 \| good	0.194 \| good	1.606 \| good	0.117 \| good
2026-10-23T17:00:00.000Z	43 \| good	0.29 \| good	0.999 \| good	46.246 \| good	0.169 \| good	0.867 \| good	0.109 \| good
2026-10-23T18:00:00.000Z	45 \| good	0.228 \| good	0.915 \| good	48.904 \| good	0.146 \| good	0.542 \| good	0.104 \| good
2026-10-23T19:00:00.000Z	47 \| good	0.549 \| good	2 \| good	50.77 \| good	0.134 \| good	0.423 \| good	0.101 \| good
2026-10-23T20:00:00.000Z	47 \| good	1.021 \| good	4.057 \| good	51.418 \| good	0.125 \| good	0.38 \| good	0.1 \| good
2026-10-23T21:00:00.000Z	48 \| good	1.086 \| good	4.336 \| good	51.558 \| good	0.116 \| good	0.383 \| good	0.098 \| good
2026-10-23T22:00:00.000Z	47 \| good	0.862 \| good	3.336 \| good	51.429 \| good	0.11 \| good	0.435 \| good	0.097 \| good
2026-10-23T23:00:00.000Z	45 \| good	0.399 \| good	1.371 \| good	49.19 \| good	0.109 \| good	0.594 \| good	0.097 \| good
2026-10-24T00:00:00.000Z	41 \| good	0.439 \| good	1.834 \| good	43.616 \| good	0.124 \| good	2.284 \| good	0.107 \| good
2026-10-24T01:00:00.000Z	35 \| good	0.433 \| good	1.834 \| good	38.18 \| good	0.158 \| good	5.819 \| good	0.125 \| good
2026-10-24T02:00:00.000Z	36 \| good	0.43 \| good	1.882 \| good	39.052 \| good	0.181 \| good	7.775 \| good	0.137 \| good
2026-10-24T03:00:00.000Z	35 \| good	0.405 \| good	1.772 \| good	37.594 \| good	0.191 \| good	8.331 \| good	0.141 \| good
2026-10-24T04:00:00.000Z	36 \| good	0.371 \| good	1.274 \| good	39.322 \| good	0.195 \| good	8.551 \| good	0.143 \| good
2026-10-24T05:00:00.000Z	35 \| good	0.398 \| good	1.336 \| good	38.315 \| good	0.197 \| good	9.055 \| good	0.147 \| good
2026-10-24T06:00:00.000Z	33 \| good	0.6 \| good	2.258 \| good	36.199 \| good	0.188 \| good	9.042 \| good	0.151 \| good
2026-10-24T07:00:00.000Z	29 \| good	1.946 \| good	7.9 \| good	31.193 \| good	0.173 \| good	8.499 \| good	0.15 \| good
2026-10-24T08:00:00.000Z	28 \| good	5.178 \| good	22.81 \| good	29.752 \| good	0.162 \| good	8.342 \| good	0.145 \| good
2026-10-24T09:00:00.000Z	49 \| good	8.733 \| good	38.322 \| good	29.293 \| good	0.155 \| good	8.917 \| good	0.144 \| good
2026-10-24T10:00:00.000Z	54 \| moderate	11.126 \| good	49.623 \| good	28.136 \| good	0.152 \| good	9.026 \| good	0.145 \| good
2026-10-24T11:00:00.000Z	64 \| moderate	15.786 \| fine	70.663 \| fine	30.174 \| good	0.17 \| good	8.21 \| good	0.139 \| good
2026-10-24T12:00:00.000Z	67 \| moderate	18.087 \| fine	80.279 \| fine	32.516 \| good	0.194 \| good	7.4 \| good	0.135 \| good
2026-10-24T13:00:00.000Z	64 \| moderate	16.041 \| fine	71.671 \| fine	33.879 \| good	0.207 \| good	6.602 \| good	0.134 \| good
2026-10-24T14:00:00.000Z	52 \| moderate	10.393 \| good	46.304 \| good	35.252 \| good	0.225 \| good	6.502 \| good	0.137 \| good
2026-10-24T15:00:00.000Z	38 \| good	6.537 \| good	28.994 \| good	37.793 \| good	0.231 \| good	2.829 \| good	0.124 \| good
2026-10-24T16:00:00.000Z	36 \| good	5.714 \| good	24.849 \| good	38.922 \| good	0.288 \| good	2.147 \| good	0.126 \| good
2026-10-24T17:00:00.000Z	34 \| good	5.156 \| good	22.297 \| good	37.314 \| good	0.36 \| good	1.93 \| good	0.13 \| good
2026-10-24T18:00:00.000Z	37 \| good	3.612 \| good	15.926 \| good	39.705 \| good	0.422 \| good	1.709 \| good	0.133 \| good
2026-10-24T19:00:00.000Z	40 \| good	2.24 \| good	9.229 \| good	42.663 \| good	0.472 \| good	1.67 \| good	0.136 \| good
2026-10-24T20:00:00.000Z	40 \| good	1.133 \| good	4.569 \| good	43.174 \| good	0.503 \| good	1.657 \| good	0.137 \| good
2026-10-24T21:00:00.000Z	41 \| good	1.336 \| good	5.621 \| good	44.475 \| good	0.511 \| good	1.672 \| good	0.138 \| good

Castle Rock

Empower business decisions with accurate air quality data

Castle Rock, Colorado air quality map: Real-time AQI near you

0.40ppm

How accurate is Colorado, USA air quality data?

Air quality measurements for Colorado, USA 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 Castle Rock, Colorado updated?

Air quality data for Castle Rock, Colorado is updated on an hourly basis.

When did Castle Rock, Colorado experience the worst air quality in the last 24 hours?

The worst air quality in Castle Rock, Colorado was recorded at 11:00:00 on 2026-10-21.

When did Castle Rock, Colorado have its best air quality in the last 24 hours?

The best air quality in Castle Rock, Colorado was recorded at 04:00:00 on 2026-10-22.

What is the real-time air quality index for Castle Rock, Colorado?

The real-time air quality index in Castle Rock, Colorado is 28, currently categorized as Good.

Which pollutant is found most often in Castle Rock, Colorado?

The most common pollutant in Castle Rock, Colorado is O3.

What can I do if the air quality in Castle Rock, Colorado is poor?

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

What are the current PM_2.5 levels in Castle Rock, Colorado?

The measured PM_2.5 levels in Castle Rock, Colorado at present are 2.778 μg/m³.

What are the current PM₁₀ levels at Castle Rock, Colorado?

The current PM₁₀ levels in Castle Rock, Colorado are 11.708 μg/m³.

What are the current carbon monoxide (CO) levels at Castle Rock, Colorado?

The current carbon monoxide (CO) level in Castle Rock, Colorado is 0.345 ppm.

What are the current sulfur dioxide (SO₂) levels at Castle Rock, Colorado?

The current sulfur dioxide (SO₂) levels in Castle Rock, Colorado are 1.04 ppb.

What are the current ozone (O₃) levels at Castle Rock, Colorado?

The current ozone (O₃) levels at Castle Rock, Colorado is 29.895 ppm.

What are the current nitrogen dioxide (NO₂) levels at Castle Rock, Colorado?

The current nitrogen dioxide (NO₂) levels at Castle Rock, Colorado is 23.223 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-10-20T22:00:00.000Z	44 \| good	7.159 \| good	30.198 \| good	47.056 \| good	1.016 \| good	10.248 \| good	0.213 \| good
2026-10-20T23:00:00.000Z	44 \| good	5.469 \| good	19.953 \| good	46.652 \| good	0.882 \| good	10.575 \| good	0.221 \| good
2026-10-21T00:00:00.000Z	41 \| good	3.116 \| good	16.895 \| good	43.964 \| good	0.819 \| good	5.863 \| good	0.19 \| good
2026-10-21T01:00:00.000Z	42 \| good	2.535 \| good	13.514 \| good	45.017 \| good	0.727 \| good	11.598 \| good	0.486 \| good
2026-10-21T02:00:00.000Z	38 \| good	2.954 \| good	11.755 \| good	40.704 \| good	0.955 \| good	14.776 \| good	0.711 \| good
2026-10-21T03:00:00.000Z	38 \| good	1.489 \| good	5.942 \| good	41.013 \| good	0.476 \| good	16.03 \| good	0.187 \| good
2026-10-21T04:00:00.000Z	32 \| good	3.734 \| good	12.378 \| good	34.874 \| good	0.944 \| good	11.172 \| good	0.579 \| good
2026-10-21T05:00:00.000Z	32 \| good	3.959 \| good	16.278 \| good	35.485 \| good	0.795 \| good	12.647 \| good	0.44 \| good
2026-10-21T06:00:00.000Z	31 \| good	4.313 \| good	17.351 \| good	34.391 \| good	1.032 \| good	15.27 \| good	0.48 \| good
2026-10-21T07:00:00.000Z	33 \| good	4.511 \| good	13.117 \| good	35.711 \| good	1.182 \| good	15.066 \| good	0.333 \| good
2026-10-21T08:00:00.000Z	33 \| good	4.286 \| good	17.454 \| good	36.095 \| good	0.943 \| good	12.851 \| good	0.301 \| good
2026-10-21T09:00:00.000Z	32 \| good	4.238 \| good	16.579 \| good	35.152 \| good	0.877 \| good	12.979 \| good	0.266 \| good
2026-10-21T10:00:00.000Z	30 \| good	5.011 \| good	12.593 \| good	32.394 \| good	0.827 \| good	15.597 \| good	0.29 \| good
2026-10-21T11:00:00.000Z	33 \| good	5.745 \| good	6.452 \| good	31.438 \| good	0.788 \| good	16.435 \| good	0.41 \| good
2026-10-21T12:00:00.000Z	33 \| good	6.39 \| good	8.443 \| good	30.974 \| good	0.778 \| good	8.184 \| good	0.482 \| good
2026-10-21T13:00:00.000Z	33 \| good	3.242 \| good	11.796 \| good	35.527 \| good	1.06 \| good	12.295 \| good	0.559 \| good
2026-10-21T14:00:00.000Z	30 \| good	4.322 \| good	11.789 \| good	31.588 \| good	1.489 \| good	12.933 \| good	0.495 \| good
2026-10-21T15:00:00.000Z	33 \| good	6.162 \| good	15.674 \| good	33.045 \| good	1.515 \| good	13.831 \| good	0.515 \| good
2026-10-21T16:00:00.000Z	33 \| good	6.347 \| good	27.307 \| good	34.221 \| good	1.534 \| good	10.697 \| good	0.402 \| good
2026-10-21T17:00:00.000Z	35 \| good	5.563 \| good	23.418 \| good	38.125 \| good	1.165 \| good	10.105 \| good	0.307 \| good
2026-10-21T18:00:00.000Z	31 \| good	5.152 \| good	21.65 \| good	32.681 \| good	1.188 \| good	11.225 \| good	0.307 \| good
2026-10-21T19:00:00.000Z	40 \| good	4.471 \| good	22.346 \| good	42.863 \| good	0.747 \| good	6.887 \| good	0.181 \| good
2026-10-21T20:00:00.000Z	42 \| good	3.53 \| good	18.88 \| good	45.405 \| good	0.67 \| good	7.719 \| good	0.169 \| good
2026-10-21T21:00:00.000Z	43 \| good	2.942 \| good	13.495 \| good	46.421 \| good	0.462 \| good	6.803 \| good	0.136 \| good
2026-10-21T22:00:00.000Z	42 \| good	3.832 \| good	18.185 \| good	45.154 \| good	0.457 \| good	7.324 \| good	0.184 \| good
2026-10-21T23:00:00.000Z	47 \| good	3.186 \| good	12.005 \| good	51.434 \| good	0.378 \| good	9.086 \| good	0.193 \| good
2026-10-22T00:00:00.000Z	44 \| good	3.45 \| good	6.907 \| good	47.091 \| good	0.75 \| good	6.86 \| good	0.256 \| good
2026-10-22T01:00:00.000Z	42 \| good	2.948 \| good	17.686 \| good	44.596 \| good	0.569 \| good	8.255 \| good	0.374 \| good
2026-10-22T02:00:00.000Z	37 \| good	2.618 \| good	7.313 \| good	39.797 \| good	0.316 \| good	8.692 \| good	0.344 \| good
2026-10-22T03:00:00.000Z	35 \| good	1.075 \| good	4.77 \| good	37.797 \| good	0.255 \| good	11.391 \| good	0.165 \| good
2026-10-22T04:00:00.000Z	34 \| good	1.403 \| good	6.445 \| good	36.826 \| good	0.842 \| good	7.053 \| good	0.312 \| good
2026-10-22T05:00:00.000Z	34 \| good	1.379 \| good	6.348 \| good	36.792 \| good	0.752 \| good	7.952 \| good	0.27 \| good
2026-10-22T06:00:00.000Z	32 \| good	1.2 \| good	5.007 \| good	35.135 \| good	0.548 \| good	9.284 \| good	0.19 \| good
2026-10-22T07:00:00.000Z	32 \| good	1.284 \| good	4.604 \| good	35.198 \| good	0.655 \| good	5.286 \| good	0.143 \| good
2026-10-22T08:00:00.000Z	31 \| good	0.673 \| good	3.015 \| good	33.482 \| good	0.581 \| good	7.055 \| good	0.145 \| good
2026-10-22T09:00:00.000Z	31 \| good	0.523 \| good	3.134 \| good	32.877 \| good	0.862 \| good	6.958 \| good	0.116 \| good
2026-10-22T10:00:00.000Z	30 \| good	0.837 \| good	2.882 \| good	32.245 \| good	0.59 \| good	9.965 \| good	0.164 \| good
2026-10-22T11:00:00.000Z	29 \| good	0.643 \| good	3.081 \| good	31.328 \| good	0.42 \| good	9.62 \| good	0.196 \| good
2026-10-22T12:00:00.000Z	30 \| good	1.111 \| good	5.58 \| good	31.878 \| good	0.569 \| good	15.65 \| good	0.196 \| good
2026-10-22T13:00:00.000Z	31 \| good	1.404 \| good	5.587 \| good	33.806 \| good	0.543 \| good	22.466 \| good	0.406 \| good
2026-10-22T14:00:00.000Z	25 \| good	2.017 \| good	6.748 \| good	26.817 \| good	0.651 \| good	24.303 \| good	0.394 \| good
2026-10-22T15:00:00.000Z	23 \| good	2.186 \| good	8.992 \| good	24.676 \| good	0.895 \| good	16.712 \| good	0.622 \| good
2026-10-22T16:00:00.000Z	21 \| good	3.218 \| good	10.086 \| good	23.345 \| good	1.188 \| good	19.326 \| good	0.503 \| good
2026-10-22T17:00:00.000Z	22 \| good	3.828 \| good	20.6 \| good	22.565 \| good	1.282 \| good	16.722 \| good	0.437 \| good
2026-10-22T18:00:00.000Z	25 \| good	4.018 \| good	15.118 \| good	26.888 \| good	1.143 \| good	14.782 \| good	0.336 \| good
2026-10-22T19:00:00.000Z	27 \| good	3.266 \| good	13.575 \| good	28.976 \| good	0.886 \| good	15.052 \| good	0.324 \| good
2026-10-22T20:00:00.000Z	28 \| good	2.778 \| good	11.708 \| good	29.895 \| good	1.04 \| good	23.223 \| good	0.345 \| good
2026-10-22T21:00:00.000Z	28 \| good	2.778 \| good	11.708 \| good	29.895 \| good	1.04 \| good	23.223 \| good	0.345 \| good
2026-10-22T22:00:00.000Z	36 \| good	0.366 \| good	1.321 \| good	38.811 \| good	0.311 \| good	1.086 \| good	0.098 \| good
2026-10-22T23:00:00.000Z	37 \| good	0.374 \| good	1.251 \| good	39.786 \| good	0.302 \| good	1.267 \| good	0.101 \| good
2026-10-23T00:00:00.000Z	36 \| good	0.392 \| good	1.336 \| good	38.547 \| good	0.305 \| good	3.943 \| good	0.119 \| good
2026-10-23T01:00:00.000Z	31 \| good	0.365 \| good	1.274 \| good	34.122 \| good	0.333 \| good	8.063 \| good	0.148 \| good
2026-10-23T02:00:00.000Z	34 \| good	0.298 \| good	1 \| good	37.452 \| good	0.337 \| good	8.331 \| good	0.155 \| good
2026-10-23T03:00:00.000Z	38 \| good	0.236 \| good	1 \| good	41.019 \| good	0.316 \| good	8.205 \| good	0.15 \| good
2026-10-23T04:00:00.000Z	37 \| good	0.246 \| good	1 \| good	40.454 \| good	0.301 \| good	7.952 \| good	0.145 \| good
2026-10-23T05:00:00.000Z	35 \| good	0.264 \| good	1 \| good	37.97 \| good	0.29 \| good	7.415 \| good	0.141 \| good
2026-10-23T06:00:00.000Z	35 \| good	0.265 \| good	1 \| good	37.823 \| good	0.274 \| good	6.381 \| good	0.134 \| good
2026-10-23T07:00:00.000Z	32 \| good	0.275 \| good	1 \| good	34.71 \| good	0.26 \| good	4.947 \| good	0.126 \| good
2026-10-23T08:00:00.000Z	30 \| good	0.299 \| good	1 \| good	32.051 \| good	0.256 \| good	3.563 \| good	0.118 \| good
2026-10-23T09:00:00.000Z	30 \| good	0.3 \| good	1 \| good	31.646 \| good	0.25 \| good	2.504 \| good	0.112 \| good
2026-10-23T10:00:00.000Z	31 \| good	0.578 \| good	2 \| good	32.705 \| good	0.24 \| good	2.001 \| good	0.11 \| good
2026-10-23T11:00:00.000Z	30 \| good	0.329 \| good	1 \| good	32.485 \| good	0.23 \| good	1.807 \| good	0.11 \| good
2026-10-23T12:00:00.000Z	31 \| good	0.729 \| good	2.834 \| good	33.662 \| good	0.22 \| good	1.799 \| good	0.111 \| good
2026-10-23T13:00:00.000Z	31 \| good	0.764 \| good	2.867 \| good	33.01 \| good	0.216 \| good	2.271 \| good	0.115 \| good
2026-10-23T14:00:00.000Z	30 \| good	1.079 \| good	4.631 \| good	32.214 \| good	0.219 \| good	2.952 \| good	0.122 \| good
2026-10-23T15:00:00.000Z	33 \| good	1.116 \| good	4.629 \| good	35.997 \| good	0.212 \| good	2.55 \| good	0.124 \| good
2026-10-23T16:00:00.000Z	39 \| good	0.458 \| good	1.798 \| good	42.114 \| good	0.194 \| good	1.606 \| good	0.117 \| good
2026-10-23T17:00:00.000Z	43 \| good	0.29 \| good	0.999 \| good	46.246 \| good	0.169 \| good	0.867 \| good	0.109 \| good
2026-10-23T18:00:00.000Z	45 \| good	0.228 \| good	0.915 \| good	48.904 \| good	0.146 \| good	0.542 \| good	0.104 \| good
2026-10-23T19:00:00.000Z	47 \| good	0.549 \| good	2 \| good	50.77 \| good	0.134 \| good	0.423 \| good	0.101 \| good
2026-10-23T20:00:00.000Z	47 \| good	1.021 \| good	4.057 \| good	51.418 \| good	0.125 \| good	0.38 \| good	0.1 \| good
2026-10-23T21:00:00.000Z	48 \| good	1.086 \| good	4.336 \| good	51.558 \| good	0.116 \| good	0.383 \| good	0.098 \| good
2026-10-23T22:00:00.000Z	47 \| good	0.862 \| good	3.336 \| good	51.429 \| good	0.11 \| good	0.435 \| good	0.097 \| good
2026-10-23T23:00:00.000Z	45 \| good	0.399 \| good	1.371 \| good	49.19 \| good	0.109 \| good	0.594 \| good	0.097 \| good
2026-10-24T00:00:00.000Z	41 \| good	0.439 \| good	1.834 \| good	43.616 \| good	0.124 \| good	2.284 \| good	0.107 \| good
2026-10-24T01:00:00.000Z	35 \| good	0.433 \| good	1.834 \| good	38.18 \| good	0.158 \| good	5.819 \| good	0.125 \| good
2026-10-24T02:00:00.000Z	36 \| good	0.43 \| good	1.882 \| good	39.052 \| good	0.181 \| good	7.775 \| good	0.137 \| good
2026-10-24T03:00:00.000Z	35 \| good	0.405 \| good	1.772 \| good	37.594 \| good	0.191 \| good	8.331 \| good	0.141 \| good
2026-10-24T04:00:00.000Z	36 \| good	0.371 \| good	1.274 \| good	39.322 \| good	0.195 \| good	8.551 \| good	0.143 \| good
2026-10-24T05:00:00.000Z	35 \| good	0.398 \| good	1.336 \| good	38.315 \| good	0.197 \| good	9.055 \| good	0.147 \| good
2026-10-24T06:00:00.000Z	33 \| good	0.6 \| good	2.258 \| good	36.199 \| good	0.188 \| good	9.042 \| good	0.151 \| good
2026-10-24T07:00:00.000Z	29 \| good	1.946 \| good	7.9 \| good	31.193 \| good	0.173 \| good	8.499 \| good	0.15 \| good
2026-10-24T08:00:00.000Z	28 \| good	5.178 \| good	22.81 \| good	29.752 \| good	0.162 \| good	8.342 \| good	0.145 \| good
2026-10-24T09:00:00.000Z	49 \| good	8.733 \| good	38.322 \| good	29.293 \| good	0.155 \| good	8.917 \| good	0.144 \| good
2026-10-24T10:00:00.000Z	54 \| moderate	11.126 \| good	49.623 \| good	28.136 \| good	0.152 \| good	9.026 \| good	0.145 \| good
2026-10-24T11:00:00.000Z	64 \| moderate	15.786 \| fine	70.663 \| fine	30.174 \| good	0.17 \| good	8.21 \| good	0.139 \| good
2026-10-24T12:00:00.000Z	67 \| moderate	18.087 \| fine	80.279 \| fine	32.516 \| good	0.194 \| good	7.4 \| good	0.135 \| good
2026-10-24T13:00:00.000Z	64 \| moderate	16.041 \| fine	71.671 \| fine	33.879 \| good	0.207 \| good	6.602 \| good	0.134 \| good
2026-10-24T14:00:00.000Z	52 \| moderate	10.393 \| good	46.304 \| good	35.252 \| good	0.225 \| good	6.502 \| good	0.137 \| good
2026-10-24T15:00:00.000Z	38 \| good	6.537 \| good	28.994 \| good	37.793 \| good	0.231 \| good	2.829 \| good	0.124 \| good
2026-10-24T16:00:00.000Z	36 \| good	5.714 \| good	24.849 \| good	38.922 \| good	0.288 \| good	2.147 \| good	0.126 \| good
2026-10-24T17:00:00.000Z	34 \| good	5.156 \| good	22.297 \| good	37.314 \| good	0.36 \| good	1.93 \| good	0.13 \| good
2026-10-24T18:00:00.000Z	37 \| good	3.612 \| good	15.926 \| good	39.705 \| good	0.422 \| good	1.709 \| good	0.133 \| good
2026-10-24T19:00:00.000Z	40 \| good	2.24 \| good	9.229 \| good	42.663 \| good	0.472 \| good	1.67 \| good	0.136 \| good
2026-10-24T20:00:00.000Z	40 \| good	1.133 \| good	4.569 \| good	43.174 \| good	0.503 \| good	1.657 \| good	0.137 \| good
2026-10-24T21:00:00.000Z	41 \| good	1.336 \| good	5.621 \| good	44.475 \| good	0.511 \| good	1.672 \| good	0.138 \| good

Real-time air quality index in Castle Rock, Colorado today

Common air pollutants in Castle Rock, Colorado

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Castle Rock, Colorado air quality forecast and history

Empower business decisions with accurate air quality data

Castle Rock, Colorado air quality map: Real-time AQI near you

Air quality in nearby cities

Castle Pines, Colorado

The Pinery, Colorado

Parker, Colorado

Lone Tree, Colorado

Highlands Ranch, Colorado

Centennial, Colorado

How accurate is Colorado, USA air quality data?

Air quality levels in US

Frequently asked questions

How frequently is the air quality data for Castle Rock, Colorado updated?

When did Castle Rock, Colorado experience the worst air quality in the last 24 hours?

When did Castle Rock, Colorado have its best air quality in the last 24 hours?

What is the real-time air quality index for Castle Rock, Colorado?

Which pollutant is found most often in Castle Rock, Colorado?

What can I do if the air quality in Castle Rock, Colorado is poor?

What are the current PM2.5 levels in Castle Rock, Colorado?

What are the current PM10 levels at Castle Rock, Colorado?

What are the current carbon monoxide (CO) levels at Castle Rock, Colorado?

What are the current sulfur dioxide (SO2) levels at Castle Rock, Colorado?

What are the current ozone (O3) levels at Castle Rock, Colorado?

What are the current nitrogen dioxide (NO2) levels at Castle Rock, Colorado?

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 Castle Rock, Colorado?

What are the current PM₁₀ levels at Castle Rock, Colorado?

What are the current sulfur dioxide (SO₂) levels at Castle Rock, Colorado?

What are the current ozone (O₃) levels at Castle Rock, Colorado?

What are the current nitrogen dioxide (NO₂) levels at Castle Rock, Colorado?