What are the current PM10 levels at Longmont, Colorado?

The current PM10 levels in Longmont, Colorado are 51.99 μg/m3.

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

The current sulfur dioxide (SO2) levels in Longmont, Colorado are 0.803 ppb.

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

The current ozone (O3) levels at Longmont, Colorado is 58.642 ppm.

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

The current nitrogen dioxide (NO2) levels at Longmont, Colorado is 6.787 ppb.

Real-time air quality index in Longmont, Colorado today

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

The measured PM2.5 levels in Longmont, Colorado at present are 11.698 μg/m3.

Stay updated with real-time air quality in Longmont, 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)

Moderate

Longmont, Colorado

Last updated: ... (Local time)

Common air pollutants in Longmont, Colorado

Good

Fine

Moderate

Poor

Very poor

Hazardous

Particulate Matter_2.5 (PM_2.5)

11.70 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

51.99 μg/m³

155

255

425

605+

Ozone (O₃)

58.64 ppb

201

201+

Sulfur Dioxide (SO₂)

0.80 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

6.79 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.19 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Low

Longmont, Colorado

Get Live Pollen Counts

Longmont, Colorado

Scroll To Air Quality Map

Track live Longmont, Colorado air quality forecast and history

Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-21T22:00:00.000Z	105 \| sensitive	15.499 \| fine	68.989 \| fine	71.689 \| moderate	0.635 \| good	2.755 \| good	0.169 \| good
2026-07-21T23:00:00.000Z	101 \| sensitive	13.298 \| fine	60.991 \| fine	70.773 \| fine	0.577 \| good	2.326 \| good	0.169 \| good
2026-07-22T00:00:00.000Z	64 \| moderate	11.299 \| good	49.994 \| good	59.488 \| fine	0.572 \| good	2.575 \| good	0.191 \| good
2026-07-22T01:00:00.000Z	71 \| moderate	9.9 \| good	44 \| good	60.962 \| fine	0.794 \| good	5.579 \| good	0.167 \| good
2026-07-22T02:00:00.000Z	52 \| moderate	9.699 \| good	42.997 \| good	55.467 \| fine	0.47 \| good	9.48 \| good	0.209 \| good
2026-07-22T03:00:00.000Z	74 \| moderate	9.499 \| good	42.993 \| good	61.758 \| fine	0.473 \| good	13.172 \| good	0.209 \| good
2026-07-22T04:00:00.000Z	84 \| moderate	8.1 \| good	35.994 \| good	64.545 \| fine	0.496 \| good	16.604 \| good	0.235 \| good
2026-07-22T05:00:00.000Z	45 \| good	7.899 \| good	34.995 \| good	48.667 \| good	0.7 \| good	11.417 \| good	0.209 \| good
2026-07-22T06:00:00.000Z	49 \| good	6.9 \| good	30.997 \| good	53.147 \| good	0.516 \| good	6.823 \| good	0.167 \| good
2026-07-22T07:00:00.000Z	45 \| good	5.5 \| good	23.997 \| good	48.585 \| good	0.585 \| good	3.924 \| good	0.145 \| good
2026-07-22T08:00:00.000Z	42 \| good	4.801 \| good	20.999 \| good	44.923 \| good	0.622 \| good	5.596 \| good	0.145 \| good
2026-07-22T09:00:00.000Z	36 \| good	5.6 \| good	23.998 \| good	39.159 \| good	0.412 \| good	6.136 \| good	0.145 \| good
2026-07-22T10:00:00.000Z	39 \| good	6.9 \| good	30.993 \| good	42.038 \| good	0.438 \| good	7.281 \| good	0.145 \| good
2026-07-22T11:00:00.000Z	38 \| good	7.5 \| good	32.99 \| good	38.121 \| good	0.577 \| good	7.77 \| good	0.166 \| good
2026-07-22T12:00:00.000Z	44 \| good	7.798 \| good	33.99 \| good	43.183 \| good	0.522 \| good	10.292 \| good	0.255 \| good
2026-07-22T13:00:00.000Z	44 \| good	8.098 \| good	35.991 \| good	29.697 \| good	0.527 \| good	10.873 \| good	0.255 \| good
2026-07-22T14:00:00.000Z	49 \| good	8.698 \| good	37.989 \| good	40.543 \| good	0.7 \| good	12.645 \| good	0.3 \| good
2026-07-22T15:00:00.000Z	49 \| good	9.309 \| good	41.997 \| good	41.809 \| good	1.061 \| good	14.899 \| good	0.3 \| good
2026-07-22T16:00:00.000Z	52 \| moderate	9.599 \| good	42.994 \| good	43.173 \| good	0.631 \| good	14.287 \| good	0.255 \| good
2026-07-22T17:00:00.000Z	52 \| moderate	9.907 \| good	44.009 \| good	54.456 \| good	0.822 \| good	7.864 \| good	0.212 \| good
2026-07-22T18:00:00.000Z	74 \| moderate	10.505 \| good	46.989 \| good	62.347 \| fine	0.827 \| good	5.435 \| good	0.223 \| good
2026-07-22T19:00:00.000Z	74 \| moderate	10.799 \| good	47.985 \| good	62.425 \| fine	0.696 \| good	6.724 \| good	0.223 \| good
2026-07-22T20:00:00.000Z	71 \| moderate	10.499 \| good	46.993 \| good	61.439 \| fine	0.606 \| good	4.955 \| good	0.2 \| good
2026-07-22T21:00:00.000Z	93 \| moderate	10.399 \| good	45.989 \| good	68.178 \| fine	0.635 \| good	6.956 \| good	0.27 \| good
2026-07-22T22:00:00.000Z	101 \| sensitive	10.4 \| good	45.994 \| good	70.812 \| fine	0.663 \| good	4.521 \| good	0.29 \| good
2026-07-22T23:00:00.000Z	80 \| moderate	10.399 \| good	45.991 \| good	63.852 \| fine	0.58 \| good	7.876 \| good	0.2 \| good
2026-07-23T00:00:00.000Z	87 \| moderate	10.3 \| good	45.985 \| good	66.485 \| fine	0.527 \| good	6.184 \| good	0.223 \| good
2026-07-23T01:00:00.000Z	74 \| moderate	10.299 \| good	45.988 \| good	62.081 \| fine	0.499 \| good	15.751 \| good	0.265 \| good
2026-07-23T02:00:00.000Z	58 \| moderate	10.399 \| good	45.987 \| good	56.739 \| fine	0.531 \| good	19.171 \| good	0.265 \| good
2026-07-23T03:00:00.000Z	42 \| good	6.432 \| good	28.491 \| good	45.282 \| good	0.208 \| good	5.7 \| good	0.162 \| good
2026-07-23T04:00:00.000Z	44 \| good	7.499 \| good	32.992 \| good	47.351 \| good	0.58 \| good	20.389 \| good	0.242 \| good
2026-07-23T05:00:00.000Z	44 \| good	7.798 \| good	33.985 \| good	44.896 \| good	0.522 \| good	18.478 \| good	0.199 \| good
2026-07-23T06:00:00.000Z	44 \| good	8.297 \| good	36.986 \| good	37.134 \| good	0.465 \| good	10.75 \| good	0.177 \| good
2026-07-23T07:00:00.000Z	44 \| good	8.398 \| good	36.986 \| good	39.868 \| good	0.41 \| good	8.802 \| good	0.154 \| good
2026-07-23T08:00:00.000Z	38 \| good	6.898 \| good	30.99 \| good	34.619 \| good	0.463 \| good	9.465 \| good	0.177 \| good
2026-07-23T09:00:00.000Z	38 \| good	7.398 \| good	32.989 \| good	32.062 \| good	0.608 \| good	11.219 \| good	0.177 \| good
2026-07-23T10:00:00.000Z	44 \| good	7.898 \| good	34.991 \| good	27.414 \| good	0.723 \| good	12.433 \| good	0.177 \| good
2026-07-23T11:00:00.000Z	49 \| good	9.097 \| good	40.984 \| good	25.034 \| good	0.741 \| good	13.464 \| good	0.174 \| good
2026-07-23T12:00:00.000Z	54 \| moderate	11.496 \| good	50.979 \| good	23.831 \| good	0.548 \| good	16.076 \| good	0.2 \| good
2026-07-23T13:00:00.000Z	58 \| moderate	12.894 \| fine	58.974 \| fine	27.095 \| good	0.607 \| good	21.812 \| good	0.315 \| good
2026-07-23T14:00:00.000Z	60 \| moderate	13.894 \| fine	62.966 \| fine	30.17 \| good	0.607 \| good	14.642 \| good	0.315 \| good
2026-07-23T15:00:00.000Z	60 \| moderate	14.294 \| fine	64.969 \| fine	39.441 \| good	0.61 \| good	12.811 \| good	0.293 \| good
2026-07-23T16:00:00.000Z	60 \| moderate	13.895 \| fine	62.975 \| fine	43.909 \| good	0.782 \| good	12.708 \| good	0.245 \| good
2026-07-23T17:00:00.000Z	62 \| moderate	14.895 \| fine	66.976 \| fine	36.107 \| good	0.813 \| good	12.606 \| good	0.22 \| good
2026-07-23T18:00:00.000Z	62 \| moderate	14.696 \| fine	64.98 \| fine	49.986 \| good	0.779 \| good	7.706 \| good	0.242 \| good
2026-07-23T19:00:00.000Z	58 \| moderate	12.997 \| fine	58.986 \| fine	54.826 \| good	0.8 \| good	6.102 \| good	0.192 \| good
2026-07-23T20:00:00.000Z	64 \| moderate	11.698 \| good	51.99 \| good	58.642 \| fine	0.803 \| good	6.787 \| good	0.192 \| good
2026-07-23T21:00:00.000Z	80 \| moderate	11.397 \| good	50.985 \| good	63.871 \| fine	0.722 \| good	6.72 \| good	0.219 \| good
2026-07-23T21:00:00.000Z	64 \| moderate	11.698 \| good	51.99 \| good	58.642 \| fine	0.803 \| good	6.787 \| good	0.192 \| good
2026-07-23T22:00:00.000Z	84 \| moderate	8.124 \| good	35.775 \| good	64.9 \| fine	0.16 \| good	1.105 \| good	0.113 \| good
2026-07-23T23:00:00.000Z	71 \| moderate	7.05 \| good	31.12 \| good	61.436 \| fine	0.154 \| good	1.291 \| good	0.115 \| good
2026-07-24T00:00:00.000Z	61 \| moderate	5.562 \| good	23.821 \| good	57.851 \| fine	0.15 \| good	1.406 \| good	0.115 \| good
2026-07-24T01:00:00.000Z	49 \| good	5.631 \| good	23.993 \| good	53.083 \| good	0.151 \| good	1.667 \| good	0.117 \| good
2026-07-24T02:00:00.000Z	47 \| good	5.534 \| good	24.682 \| good	50.737 \| good	0.159 \| good	3.488 \| good	0.131 \| good
2026-07-24T03:00:00.000Z	47 \| good	3.516 \| good	15.454 \| good	50.975 \| good	0.183 \| good	6.939 \| good	0.157 \| good
2026-07-24T04:00:00.000Z	44 \| good	4.31 \| good	18.982 \| good	46.554 \| good	0.208 \| good	9.342 \| good	0.176 \| good
2026-07-24T05:00:00.000Z	43 \| good	3.193 \| good	14.05 \| good	46.112 \| good	0.218 \| good	10.853 \| good	0.188 \| good
2026-07-24T06:00:00.000Z	39 \| good	1.563 \| good	6.394 \| good	41.974 \| good	0.212 \| good	10.933 \| good	0.189 \| good
2026-07-24T07:00:00.000Z	34 \| good	2.596 \| good	10.797 \| good	37.394 \| good	0.197 \| good	9.831 \| good	0.181 \| good
2026-07-24T08:00:00.000Z	33 \| good	3.572 \| good	15.715 \| good	35.633 \| good	0.181 \| good	9.08 \| good	0.174 \| good
2026-07-24T09:00:00.000Z	35 \| good	4.517 \| good	19.549 \| good	37.76 \| good	0.16 \| good	8.227 \| good	0.167 \| good
2026-07-24T10:00:00.000Z	33 \| good	6.392 \| good	28.39 \| good	35.478 \| good	0.14 \| good	7.435 \| good	0.161 \| good
2026-07-24T11:00:00.000Z	38 \| good	6.775 \| good	29.916 \| good	30.26 \| good	0.121 \| good	6.851 \| good	0.155 \| good
2026-07-24T12:00:00.000Z	38 \| good	6.559 \| good	29.298 \| good	26.663 \| good	0.104 \| good	6 \| good	0.151 \| good
2026-07-24T13:00:00.000Z	44 \| good	7.801 \| good	34.265 \| good	28.146 \| good	0.095 \| good	4.501 \| good	0.148 \| good
2026-07-24T14:00:00.000Z	49 \| good	8.99 \| good	39.775 \| good	36.725 \| good	0.107 \| good	3.599 \| good	0.146 \| good
2026-07-24T15:00:00.000Z	46 \| good	8.442 \| good	37.143 \| good	49.671 \| good	0.148 \| good	2.576 \| good	0.135 \| good
2026-07-24T16:00:00.000Z	54 \| moderate	9.176 \| good	40.843 \| good	56.453 \| fine	0.235 \| good	1.467 \| good	0.125 \| good
2026-07-24T17:00:00.000Z	67 \| moderate	8.435 \| good	36.951 \| good	59.553 \| fine	0.226 \| good	0.771 \| good	0.12 \| good
2026-07-24T18:00:00.000Z	71 \| moderate	7.371 \| good	32.341 \| good	60.629 \| fine	0.206 \| good	0.51 \| good	0.119 \| good
2026-07-24T19:00:00.000Z	67 \| moderate	6.45 \| good	28.74 \| good	59.694 \| fine	0.19 \| good	0.425 \| good	0.119 \| good
2026-07-24T20:00:00.000Z	71 \| moderate	7.085 \| good	31.552 \| good	60.636 \| fine	0.181 \| good	0.401 \| good	0.119 \| good
2026-07-24T21:00:00.000Z	64 \| moderate	10.169 \| good	45.293 \| good	59.35 \| fine	0.175 \| good	0.429 \| good	0.119 \| good
2026-07-24T22:00:00.000Z	61 \| moderate	8.793 \| good	38.461 \| good	57.709 \| fine	0.175 \| good	0.529 \| good	0.118 \| good
2026-07-24T23:00:00.000Z	61 \| moderate	8.059 \| good	35.255 \| good	57.562 \| fine	0.18 \| good	0.757 \| good	0.119 \| good
2026-07-25T00:00:00.000Z	47 \| good	3.834 \| good	16.917 \| good	50.818 \| good	0.179 \| good	1.387 \| good	0.126 \| good
2026-07-25T01:00:00.000Z	47 \| good	5.975 \| good	26.055 \| good	50.847 \| good	0.19 \| good	1.749 \| good	0.129 \| good
2026-07-25T02:00:00.000Z	47 \| good	5.451 \| good	23.873 \| good	50.685 \| good	0.177 \| good	3.029 \| good	0.139 \| good
2026-07-25T03:00:00.000Z	46 \| good	4.358 \| good	19.161 \| good	49.896 \| good	0.176 \| good	4.456 \| good	0.148 \| good
2026-07-25T04:00:00.000Z	43 \| good	4.352 \| good	18.757 \| good	46.197 \| good	0.175 \| good	5.305 \| good	0.154 \| good
2026-07-25T05:00:00.000Z	41 \| good	4.072 \| good	17.682 \| good	44.217 \| good	0.172 \| good	6.078 \| good	0.16 \| good
2026-07-25T06:00:00.000Z	38 \| good	3.983 \| good	17.498 \| good	40.997 \| good	0.168 \| good	6.763 \| good	0.165 \| good
2026-07-25T07:00:00.000Z	37 \| good	3.544 \| good	15.48 \| good	39.672 \| good	0.16 \| good	7.227 \| good	0.169 \| good
2026-07-25T08:00:00.000Z	33 \| good	4.648 \| good	19.843 \| good	36.256 \| good	0.15 \| good	7.588 \| good	0.172 \| good
2026-07-25T09:00:00.000Z	33 \| good	5.681 \| good	24.663 \| good	34.585 \| good	0.138 \| good	7.8 \| good	0.173 \| good
2026-07-25T10:00:00.000Z	44 \| good	8.268 \| good	36.291 \| good	35.994 \| good	0.13 \| good	7.907 \| good	0.174 \| good
2026-07-25T11:00:00.000Z	49 \| good	8.868 \| good	38.728 \| good	30.17 \| good	0.126 \| good	7.899 \| good	0.172 \| good
2026-07-25T12:00:00.000Z	44 \| good	7.799 \| good	34.366 \| good	26.415 \| good	0.121 \| good	7.433 \| good	0.171 \| good
2026-07-25T13:00:00.000Z	44 \| good	8.314 \| good	36.633 \| good	30.66 \| good	0.113 \| good	5.691 \| good	0.168 \| good
2026-07-25T14:00:00.000Z	49 \| good	8.884 \| good	39.434 \| good	40.756 \| good	0.13 \| good	4.455 \| good	0.167 \| good
2026-07-25T15:00:00.000Z	49 \| good	8.966 \| good	40.16 \| good	52.87 \| good	0.174 \| good	2.323 \| good	0.141 \| good
2026-07-25T16:00:00.000Z	77 \| moderate	10.54 \| good	46.788 \| good	63.225 \| fine	0.242 \| good	1.509 \| good	0.132 \| good
2026-07-25T17:00:00.000Z	100 \| moderate	10.053 \| good	44.596 \| good	69.767 \| fine	0.285 \| good	0.976 \| good	0.127 \| good
2026-07-25T18:00:00.000Z	97 \| moderate	8.412 \| good	36.871 \| good	69.308 \| fine	0.256 \| good	0.657 \| good	0.124 \| good
2026-07-25T19:00:00.000Z	105 \| sensitive	8.025 \| good	35.277 \| good	71.811 \| moderate	0.219 \| good	0.521 \| good	0.121 \| good
2026-07-25T20:00:00.000Z	122 \| sensitive	8.708 \| good	38.263 \| good	76.668 \| moderate	0.188 \| good	0.52 \| good	0.118 \| good
2026-07-25T21:00:00.000Z	115 \| sensitive	8.059 \| good	35.385 \| good	75.017 \| moderate	0.171 \| good	0.604 \| good	0.116 \| good

Longmont

Empower business decisions with accurate air quality data

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

0.19ppm

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 Longmont, Colorado updated?

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

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

The worst air quality in Longmont, Colorado was recorded at 10:00:00 on 2026-07-22.

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

The best air quality in Longmont, Colorado was recorded at 09:00:00 on 2026-07-23.

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

The real-time air quality index in Longmont, Colorado is 64, currently categorized as Moderate.

Which pollutant is found most often in Longmont, Colorado?

The most common pollutant in Longmont, Colorado is O3.

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

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

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

The measured PM_2.5 levels in Longmont, Colorado at present are 11.698 μg/m³.

What are the current PM₁₀ levels at Longmont, Colorado?

The current PM₁₀ levels in Longmont, Colorado are 51.99 μg/m³.

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

The current carbon monoxide (CO) level in Longmont, Colorado is 0.192 ppm.

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

The current sulfur dioxide (SO₂) levels in Longmont, Colorado are 0.803 ppb.

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

The current ozone (O₃) levels at Longmont, Colorado is 58.642 ppm.

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

The current nitrogen dioxide (NO₂) levels at Longmont, Colorado is 6.787 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2026-07-21T22:00:00.000Z	105 \| sensitive	15.499 \| fine	68.989 \| fine	71.689 \| moderate	0.635 \| good	2.755 \| good	0.169 \| good
2026-07-21T23:00:00.000Z	101 \| sensitive	13.298 \| fine	60.991 \| fine	70.773 \| fine	0.577 \| good	2.326 \| good	0.169 \| good
2026-07-22T00:00:00.000Z	64 \| moderate	11.299 \| good	49.994 \| good	59.488 \| fine	0.572 \| good	2.575 \| good	0.191 \| good
2026-07-22T01:00:00.000Z	71 \| moderate	9.9 \| good	44 \| good	60.962 \| fine	0.794 \| good	5.579 \| good	0.167 \| good
2026-07-22T02:00:00.000Z	52 \| moderate	9.699 \| good	42.997 \| good	55.467 \| fine	0.47 \| good	9.48 \| good	0.209 \| good
2026-07-22T03:00:00.000Z	74 \| moderate	9.499 \| good	42.993 \| good	61.758 \| fine	0.473 \| good	13.172 \| good	0.209 \| good
2026-07-22T04:00:00.000Z	84 \| moderate	8.1 \| good	35.994 \| good	64.545 \| fine	0.496 \| good	16.604 \| good	0.235 \| good
2026-07-22T05:00:00.000Z	45 \| good	7.899 \| good	34.995 \| good	48.667 \| good	0.7 \| good	11.417 \| good	0.209 \| good
2026-07-22T06:00:00.000Z	49 \| good	6.9 \| good	30.997 \| good	53.147 \| good	0.516 \| good	6.823 \| good	0.167 \| good
2026-07-22T07:00:00.000Z	45 \| good	5.5 \| good	23.997 \| good	48.585 \| good	0.585 \| good	3.924 \| good	0.145 \| good
2026-07-22T08:00:00.000Z	42 \| good	4.801 \| good	20.999 \| good	44.923 \| good	0.622 \| good	5.596 \| good	0.145 \| good
2026-07-22T09:00:00.000Z	36 \| good	5.6 \| good	23.998 \| good	39.159 \| good	0.412 \| good	6.136 \| good	0.145 \| good
2026-07-22T10:00:00.000Z	39 \| good	6.9 \| good	30.993 \| good	42.038 \| good	0.438 \| good	7.281 \| good	0.145 \| good
2026-07-22T11:00:00.000Z	38 \| good	7.5 \| good	32.99 \| good	38.121 \| good	0.577 \| good	7.77 \| good	0.166 \| good
2026-07-22T12:00:00.000Z	44 \| good	7.798 \| good	33.99 \| good	43.183 \| good	0.522 \| good	10.292 \| good	0.255 \| good
2026-07-22T13:00:00.000Z	44 \| good	8.098 \| good	35.991 \| good	29.697 \| good	0.527 \| good	10.873 \| good	0.255 \| good
2026-07-22T14:00:00.000Z	49 \| good	8.698 \| good	37.989 \| good	40.543 \| good	0.7 \| good	12.645 \| good	0.3 \| good
2026-07-22T15:00:00.000Z	49 \| good	9.309 \| good	41.997 \| good	41.809 \| good	1.061 \| good	14.899 \| good	0.3 \| good
2026-07-22T16:00:00.000Z	52 \| moderate	9.599 \| good	42.994 \| good	43.173 \| good	0.631 \| good	14.287 \| good	0.255 \| good
2026-07-22T17:00:00.000Z	52 \| moderate	9.907 \| good	44.009 \| good	54.456 \| good	0.822 \| good	7.864 \| good	0.212 \| good
2026-07-22T18:00:00.000Z	74 \| moderate	10.505 \| good	46.989 \| good	62.347 \| fine	0.827 \| good	5.435 \| good	0.223 \| good
2026-07-22T19:00:00.000Z	74 \| moderate	10.799 \| good	47.985 \| good	62.425 \| fine	0.696 \| good	6.724 \| good	0.223 \| good
2026-07-22T20:00:00.000Z	71 \| moderate	10.499 \| good	46.993 \| good	61.439 \| fine	0.606 \| good	4.955 \| good	0.2 \| good
2026-07-22T21:00:00.000Z	93 \| moderate	10.399 \| good	45.989 \| good	68.178 \| fine	0.635 \| good	6.956 \| good	0.27 \| good
2026-07-22T22:00:00.000Z	101 \| sensitive	10.4 \| good	45.994 \| good	70.812 \| fine	0.663 \| good	4.521 \| good	0.29 \| good
2026-07-22T23:00:00.000Z	80 \| moderate	10.399 \| good	45.991 \| good	63.852 \| fine	0.58 \| good	7.876 \| good	0.2 \| good
2026-07-23T00:00:00.000Z	87 \| moderate	10.3 \| good	45.985 \| good	66.485 \| fine	0.527 \| good	6.184 \| good	0.223 \| good
2026-07-23T01:00:00.000Z	74 \| moderate	10.299 \| good	45.988 \| good	62.081 \| fine	0.499 \| good	15.751 \| good	0.265 \| good
2026-07-23T02:00:00.000Z	58 \| moderate	10.399 \| good	45.987 \| good	56.739 \| fine	0.531 \| good	19.171 \| good	0.265 \| good
2026-07-23T03:00:00.000Z	42 \| good	6.432 \| good	28.491 \| good	45.282 \| good	0.208 \| good	5.7 \| good	0.162 \| good
2026-07-23T04:00:00.000Z	44 \| good	7.499 \| good	32.992 \| good	47.351 \| good	0.58 \| good	20.389 \| good	0.242 \| good
2026-07-23T05:00:00.000Z	44 \| good	7.798 \| good	33.985 \| good	44.896 \| good	0.522 \| good	18.478 \| good	0.199 \| good
2026-07-23T06:00:00.000Z	44 \| good	8.297 \| good	36.986 \| good	37.134 \| good	0.465 \| good	10.75 \| good	0.177 \| good
2026-07-23T07:00:00.000Z	44 \| good	8.398 \| good	36.986 \| good	39.868 \| good	0.41 \| good	8.802 \| good	0.154 \| good
2026-07-23T08:00:00.000Z	38 \| good	6.898 \| good	30.99 \| good	34.619 \| good	0.463 \| good	9.465 \| good	0.177 \| good
2026-07-23T09:00:00.000Z	38 \| good	7.398 \| good	32.989 \| good	32.062 \| good	0.608 \| good	11.219 \| good	0.177 \| good
2026-07-23T10:00:00.000Z	44 \| good	7.898 \| good	34.991 \| good	27.414 \| good	0.723 \| good	12.433 \| good	0.177 \| good
2026-07-23T11:00:00.000Z	49 \| good	9.097 \| good	40.984 \| good	25.034 \| good	0.741 \| good	13.464 \| good	0.174 \| good
2026-07-23T12:00:00.000Z	54 \| moderate	11.496 \| good	50.979 \| good	23.831 \| good	0.548 \| good	16.076 \| good	0.2 \| good
2026-07-23T13:00:00.000Z	58 \| moderate	12.894 \| fine	58.974 \| fine	27.095 \| good	0.607 \| good	21.812 \| good	0.315 \| good
2026-07-23T14:00:00.000Z	60 \| moderate	13.894 \| fine	62.966 \| fine	30.17 \| good	0.607 \| good	14.642 \| good	0.315 \| good
2026-07-23T15:00:00.000Z	60 \| moderate	14.294 \| fine	64.969 \| fine	39.441 \| good	0.61 \| good	12.811 \| good	0.293 \| good
2026-07-23T16:00:00.000Z	60 \| moderate	13.895 \| fine	62.975 \| fine	43.909 \| good	0.782 \| good	12.708 \| good	0.245 \| good
2026-07-23T17:00:00.000Z	62 \| moderate	14.895 \| fine	66.976 \| fine	36.107 \| good	0.813 \| good	12.606 \| good	0.22 \| good
2026-07-23T18:00:00.000Z	62 \| moderate	14.696 \| fine	64.98 \| fine	49.986 \| good	0.779 \| good	7.706 \| good	0.242 \| good
2026-07-23T19:00:00.000Z	58 \| moderate	12.997 \| fine	58.986 \| fine	54.826 \| good	0.8 \| good	6.102 \| good	0.192 \| good
2026-07-23T20:00:00.000Z	64 \| moderate	11.698 \| good	51.99 \| good	58.642 \| fine	0.803 \| good	6.787 \| good	0.192 \| good
2026-07-23T21:00:00.000Z	80 \| moderate	11.397 \| good	50.985 \| good	63.871 \| fine	0.722 \| good	6.72 \| good	0.219 \| good
2026-07-23T21:00:00.000Z	64 \| moderate	11.698 \| good	51.99 \| good	58.642 \| fine	0.803 \| good	6.787 \| good	0.192 \| good
2026-07-23T22:00:00.000Z	84 \| moderate	8.124 \| good	35.775 \| good	64.9 \| fine	0.16 \| good	1.105 \| good	0.113 \| good
2026-07-23T23:00:00.000Z	71 \| moderate	7.05 \| good	31.12 \| good	61.436 \| fine	0.154 \| good	1.291 \| good	0.115 \| good
2026-07-24T00:00:00.000Z	61 \| moderate	5.562 \| good	23.821 \| good	57.851 \| fine	0.15 \| good	1.406 \| good	0.115 \| good
2026-07-24T01:00:00.000Z	49 \| good	5.631 \| good	23.993 \| good	53.083 \| good	0.151 \| good	1.667 \| good	0.117 \| good
2026-07-24T02:00:00.000Z	47 \| good	5.534 \| good	24.682 \| good	50.737 \| good	0.159 \| good	3.488 \| good	0.131 \| good
2026-07-24T03:00:00.000Z	47 \| good	3.516 \| good	15.454 \| good	50.975 \| good	0.183 \| good	6.939 \| good	0.157 \| good
2026-07-24T04:00:00.000Z	44 \| good	4.31 \| good	18.982 \| good	46.554 \| good	0.208 \| good	9.342 \| good	0.176 \| good
2026-07-24T05:00:00.000Z	43 \| good	3.193 \| good	14.05 \| good	46.112 \| good	0.218 \| good	10.853 \| good	0.188 \| good
2026-07-24T06:00:00.000Z	39 \| good	1.563 \| good	6.394 \| good	41.974 \| good	0.212 \| good	10.933 \| good	0.189 \| good
2026-07-24T07:00:00.000Z	34 \| good	2.596 \| good	10.797 \| good	37.394 \| good	0.197 \| good	9.831 \| good	0.181 \| good
2026-07-24T08:00:00.000Z	33 \| good	3.572 \| good	15.715 \| good	35.633 \| good	0.181 \| good	9.08 \| good	0.174 \| good
2026-07-24T09:00:00.000Z	35 \| good	4.517 \| good	19.549 \| good	37.76 \| good	0.16 \| good	8.227 \| good	0.167 \| good
2026-07-24T10:00:00.000Z	33 \| good	6.392 \| good	28.39 \| good	35.478 \| good	0.14 \| good	7.435 \| good	0.161 \| good
2026-07-24T11:00:00.000Z	38 \| good	6.775 \| good	29.916 \| good	30.26 \| good	0.121 \| good	6.851 \| good	0.155 \| good
2026-07-24T12:00:00.000Z	38 \| good	6.559 \| good	29.298 \| good	26.663 \| good	0.104 \| good	6 \| good	0.151 \| good
2026-07-24T13:00:00.000Z	44 \| good	7.801 \| good	34.265 \| good	28.146 \| good	0.095 \| good	4.501 \| good	0.148 \| good
2026-07-24T14:00:00.000Z	49 \| good	8.99 \| good	39.775 \| good	36.725 \| good	0.107 \| good	3.599 \| good	0.146 \| good
2026-07-24T15:00:00.000Z	46 \| good	8.442 \| good	37.143 \| good	49.671 \| good	0.148 \| good	2.576 \| good	0.135 \| good
2026-07-24T16:00:00.000Z	54 \| moderate	9.176 \| good	40.843 \| good	56.453 \| fine	0.235 \| good	1.467 \| good	0.125 \| good
2026-07-24T17:00:00.000Z	67 \| moderate	8.435 \| good	36.951 \| good	59.553 \| fine	0.226 \| good	0.771 \| good	0.12 \| good
2026-07-24T18:00:00.000Z	71 \| moderate	7.371 \| good	32.341 \| good	60.629 \| fine	0.206 \| good	0.51 \| good	0.119 \| good
2026-07-24T19:00:00.000Z	67 \| moderate	6.45 \| good	28.74 \| good	59.694 \| fine	0.19 \| good	0.425 \| good	0.119 \| good
2026-07-24T20:00:00.000Z	71 \| moderate	7.085 \| good	31.552 \| good	60.636 \| fine	0.181 \| good	0.401 \| good	0.119 \| good
2026-07-24T21:00:00.000Z	64 \| moderate	10.169 \| good	45.293 \| good	59.35 \| fine	0.175 \| good	0.429 \| good	0.119 \| good
2026-07-24T22:00:00.000Z	61 \| moderate	8.793 \| good	38.461 \| good	57.709 \| fine	0.175 \| good	0.529 \| good	0.118 \| good
2026-07-24T23:00:00.000Z	61 \| moderate	8.059 \| good	35.255 \| good	57.562 \| fine	0.18 \| good	0.757 \| good	0.119 \| good
2026-07-25T00:00:00.000Z	47 \| good	3.834 \| good	16.917 \| good	50.818 \| good	0.179 \| good	1.387 \| good	0.126 \| good
2026-07-25T01:00:00.000Z	47 \| good	5.975 \| good	26.055 \| good	50.847 \| good	0.19 \| good	1.749 \| good	0.129 \| good
2026-07-25T02:00:00.000Z	47 \| good	5.451 \| good	23.873 \| good	50.685 \| good	0.177 \| good	3.029 \| good	0.139 \| good
2026-07-25T03:00:00.000Z	46 \| good	4.358 \| good	19.161 \| good	49.896 \| good	0.176 \| good	4.456 \| good	0.148 \| good
2026-07-25T04:00:00.000Z	43 \| good	4.352 \| good	18.757 \| good	46.197 \| good	0.175 \| good	5.305 \| good	0.154 \| good
2026-07-25T05:00:00.000Z	41 \| good	4.072 \| good	17.682 \| good	44.217 \| good	0.172 \| good	6.078 \| good	0.16 \| good
2026-07-25T06:00:00.000Z	38 \| good	3.983 \| good	17.498 \| good	40.997 \| good	0.168 \| good	6.763 \| good	0.165 \| good
2026-07-25T07:00:00.000Z	37 \| good	3.544 \| good	15.48 \| good	39.672 \| good	0.16 \| good	7.227 \| good	0.169 \| good
2026-07-25T08:00:00.000Z	33 \| good	4.648 \| good	19.843 \| good	36.256 \| good	0.15 \| good	7.588 \| good	0.172 \| good
2026-07-25T09:00:00.000Z	33 \| good	5.681 \| good	24.663 \| good	34.585 \| good	0.138 \| good	7.8 \| good	0.173 \| good
2026-07-25T10:00:00.000Z	44 \| good	8.268 \| good	36.291 \| good	35.994 \| good	0.13 \| good	7.907 \| good	0.174 \| good
2026-07-25T11:00:00.000Z	49 \| good	8.868 \| good	38.728 \| good	30.17 \| good	0.126 \| good	7.899 \| good	0.172 \| good
2026-07-25T12:00:00.000Z	44 \| good	7.799 \| good	34.366 \| good	26.415 \| good	0.121 \| good	7.433 \| good	0.171 \| good
2026-07-25T13:00:00.000Z	44 \| good	8.314 \| good	36.633 \| good	30.66 \| good	0.113 \| good	5.691 \| good	0.168 \| good
2026-07-25T14:00:00.000Z	49 \| good	8.884 \| good	39.434 \| good	40.756 \| good	0.13 \| good	4.455 \| good	0.167 \| good
2026-07-25T15:00:00.000Z	49 \| good	8.966 \| good	40.16 \| good	52.87 \| good	0.174 \| good	2.323 \| good	0.141 \| good
2026-07-25T16:00:00.000Z	77 \| moderate	10.54 \| good	46.788 \| good	63.225 \| fine	0.242 \| good	1.509 \| good	0.132 \| good
2026-07-25T17:00:00.000Z	100 \| moderate	10.053 \| good	44.596 \| good	69.767 \| fine	0.285 \| good	0.976 \| good	0.127 \| good
2026-07-25T18:00:00.000Z	97 \| moderate	8.412 \| good	36.871 \| good	69.308 \| fine	0.256 \| good	0.657 \| good	0.124 \| good
2026-07-25T19:00:00.000Z	105 \| sensitive	8.025 \| good	35.277 \| good	71.811 \| moderate	0.219 \| good	0.521 \| good	0.121 \| good
2026-07-25T20:00:00.000Z	122 \| sensitive	8.708 \| good	38.263 \| good	76.668 \| moderate	0.188 \| good	0.52 \| good	0.118 \| good
2026-07-25T21:00:00.000Z	115 \| sensitive	8.059 \| good	35.385 \| good	75.017 \| moderate	0.171 \| good	0.604 \| good	0.116 \| good

Real-time air quality index in Longmont, Colorado today

Common air pollutants in Longmont, Colorado

Particulate Matter2.5 (PM2.5)

Particulate Matter10 (PM10)

Ozone (O3)

Sulfur Dioxide (SO2)

Nitrogen Dioxide (NO2)

Carbon Monoxide (CO)

Track live Longmont, Colorado air quality forecast and history

Empower business decisions with accurate air quality data

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

Air quality in nearby cities

Gunbarrel, Colorado

Erie, Colorado

Firestone, Colorado

Berthoud, Colorado

Frederick, Colorado

Lafayette, 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 Longmont, Colorado updated?

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

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

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

Which pollutant is found most often in Longmont, Colorado?

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

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

What are the current PM10 levels at Longmont, Colorado?

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

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

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

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

What are the current PM₁₀ levels at Longmont, Colorado?

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

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

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