What are the current PM10 levels at Longmont, Colorado?

The current PM10 levels in Longmont, Colorado are 100.97 μg/m3.

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

The current sulfur dioxide (SO2) levels in Longmont, Colorado are 1.301 ppb.

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

The current ozone (O3) levels at Longmont, Colorado is 27.511 ppm.

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

The current nitrogen dioxide (NO2) levels at Longmont, Colorado is 7.873 ppb.

Real-time air quality index in Longmont, Colorado today

Name: Live air pollution levels in Longmont, Colorado today
Creator: Ambee

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)

23.10 μg/m³

12.1

35.5

55.5

250.5

500.5+

Particulate Matter₁₀ (PM₁₀)

100.97 μg/m³

155

255

425

605+

Ozone (O₃)

27.51 ppb

201

201+

Sulfur Dioxide (SO₂)

1.30 ppb

186

605

1005+

Nitrogen Dioxide (NO₂)

7.87 ppb

101

361

1250

2050+

Carbon Monoxide (CO)

0.29 ppm

4.5

9.5

12.5

230.5

50.5+

Pollen Level

Moderate

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
2025-09-04T17:00:00.000Z	66 \| moderate	16.5 \| fine	72.988 \| fine	45.075 \| good	0.612 \| good	11.064 \| good	0.236 \| good
2025-09-04T18:00:00.000Z	67 \| moderate	18.101 \| fine	80.976 \| fine	43.313 \| good	0.591 \| good	7.144 \| good	0.243 \| good
2025-09-04T19:00:00.000Z	73 \| moderate	21.202 \| fine	92.972 \| fine	57.033 \| fine	0.341 \| good	4.288 \| good	0.261 \| good
2025-09-04T20:00:00.000Z	79 \| moderate	23.601 \| fine	102.972 \| fine	61.389 \| fine	0.535 \| good	5.56 \| good	0.263 \| good
2025-09-04T21:00:00.000Z	87 \| moderate	23.202 \| fine	100.972 \| fine	65.891 \| fine	0.509 \| good	2.571 \| good	0.264 \| good
2025-09-04T22:00:00.000Z	71 \| moderate	20.306 \| fine	88.987 \| fine	58.196 \| fine	0.446 \| good	12.305 \| good	0.298 \| good
2025-09-04T23:00:00.000Z	69 \| moderate	19.408 \| fine	84.985 \| fine	56.301 \| fine	0.419 \| good	7.764 \| good	0.277 \| good
2025-09-05T00:00:00.000Z	82 \| moderate	25.899 \| fine	112.968 \| fine	58.642 \| fine	0.477 \| good	9.118 \| good	0.322 \| good
2025-09-05T01:00:00.000Z	137 \| sensitive	50.183 \| moderate	226.89 \| moderate	48.34 \| good	0.385 \| good	10.048 \| good	0.358 \| good
2025-09-05T02:00:00.000Z	140 \| sensitive	51.486 \| moderate	232.877 \| moderate	61.093 \| fine	0.51 \| good	7.829 \| good	0.383 \| good
2025-09-05T03:00:00.000Z	139 \| sensitive	50.696 \| moderate	228.913 \| moderate	56.449 \| fine	0.416 \| good	6.347 \| good	0.338 \| good
2025-09-05T04:00:00.000Z	130 \| sensitive	47.398 \| moderate	212.93 \| moderate	43.758 \| good	0.417 \| good	8.265 \| good	0.269 \| good
2025-09-05T05:00:00.000Z	110 \| sensitive	38.502 \| moderate	168.946 \| moderate	40.185 \| good	0.417 \| good	6.456 \| good	0.245 \| good
2025-09-05T06:00:00.000Z	98 \| moderate	34.401 \| fine	148.981 \| fine	47.253 \| good	0.417 \| good	2.318 \| good	0.245 \| good
2025-09-05T07:00:00.000Z	94 \| moderate	32.004 \| fine	138.97 \| fine	36.734 \| good	0.258 \| good	2.036 \| good	0.224 \| good
2025-09-05T08:00:00.000Z	90 \| moderate	30.301 \| fine	130.963 \| fine	33.353 \| good	0.293 \| good	2.909 \| good	0.224 \| good
2025-09-05T09:00:00.000Z	86 \| moderate	28.102 \| fine	122.977 \| fine	32.126 \| good	0.254 \| good	4.999 \| good	0.245 \| good
2025-09-05T10:00:00.000Z	82 \| moderate	26.202 \| fine	114.98 \| fine	30.815 \| good	0.298 \| good	5.409 \| good	0.2 \| good
2025-09-05T11:00:00.000Z	81 \| moderate	24.801 \| fine	108.984 \| fine	24.752 \| good	0.323 \| good	5.688 \| good	0.224 \| good
2025-09-05T12:00:00.000Z	77 \| moderate	23.301 \| fine	102.977 \| fine	29.858 \| good	0.29 \| good	7.496 \| good	0.224 \| good
2025-09-05T13:00:00.000Z	75 \| moderate	22.401 \| fine	98.988 \| fine	30.507 \| good	0.262 \| good	7.199 \| good	0.224 \| good
2025-09-05T14:00:00.000Z	77 \| moderate	22.5 \| fine	98.978 \| fine	34.085 \| good	0.195 \| good	6.491 \| good	0.2 \| good
2025-09-05T15:00:00.000Z	77 \| moderate	22.801 \| fine	100.973 \| fine	36.295 \| good	0.184 \| good	6.402 \| good	0.245 \| good
2025-09-05T16:00:00.000Z	75 \| moderate	22 \| fine	96.977 \| fine	34.174 \| good	0.314 \| good	6.126 \| good	0.269 \| good
2025-09-05T17:00:00.000Z	73 \| moderate	21.101 \| fine	92.982 \| fine	36.863 \| good	0.255 \| good	5.319 \| good	0.221 \| good
2025-09-05T18:00:00.000Z	73 \| moderate	20.901 \| fine	92.974 \| fine	38.104 \| good	0.253 \| good	5.706 \| good	0.245 \| good
2025-09-05T19:00:00.000Z	73 \| moderate	21.101 \| fine	92.979 \| fine	38.202 \| good	0.418 \| good	6.302 \| good	0.221 \| good
2025-09-05T20:00:00.000Z	73 \| moderate	21.1 \| fine	92.977 \| fine	38.888 \| good	0.379 \| good	8.257 \| good	0.29 \| good
2025-09-05T21:00:00.000Z	73 \| moderate	21.2 \| fine	92.975 \| fine	40.675 \| good	0.318 \| good	7.658 \| good	0.29 \| good
2025-09-05T22:00:00.000Z	73 \| moderate	21.301 \| fine	92.982 \| fine	41.393 \| good	0.347 \| good	7.116 \| good	0.221 \| good
2025-09-05T23:00:00.000Z	73 \| moderate	21.3 \| fine	92.984 \| fine	41.341 \| good	0.313 \| good	7.632 \| good	0.245 \| good
2025-09-06T00:00:00.000Z	73 \| moderate	21.301 \| fine	92.973 \| fine	39.851 \| good	0.345 \| good	9.269 \| good	0.267 \| good
2025-09-06T01:00:00.000Z	73 \| moderate	21.3 \| fine	92.979 \| fine	39.131 \| good	0.347 \| good	10.511 \| good	0.309 \| good
2025-09-06T02:00:00.000Z	73 \| moderate	21.3 \| fine	92.989 \| fine	34.541 \| good	0.287 \| good	10.995 \| good	0.331 \| good
2025-09-06T03:00:00.000Z	73 \| moderate	21.299 \| fine	92.983 \| fine	33.711 \| good	0.23 \| good	13.233 \| good	0.378 \| good
2025-09-06T04:00:00.000Z	77 \| moderate	22.898 \| fine	100.975 \| fine	31 \| good	0.344 \| good	12.253 \| good	0.336 \| good
2025-09-06T05:00:00.000Z	79 \| moderate	24.098 \| fine	104.973 \| fine	24.421 \| good	0.327 \| good	12.747 \| good	0.426 \| good
2025-09-06T06:00:00.000Z	79 \| moderate	24.498 \| fine	106.978 \| fine	21.473 \| good	0.253 \| good	18.193 \| good	0.424 \| good
2025-09-06T07:00:00.000Z	79 \| moderate	24.299 \| fine	106.978 \| fine	22.115 \| good	0.348 \| good	18.903 \| good	0.423 \| good
2025-09-06T08:00:00.000Z	79 \| moderate	23.898 \| fine	104.969 \| fine	18.753 \| good	0.382 \| good	17.005 \| good	0.354 \| good
2025-09-06T09:00:00.000Z	79 \| moderate	23.599 \| fine	102.969 \| fine	17.949 \| good	0.275 \| good	13.26 \| good	0.333 \| good
2025-09-06T10:00:00.000Z	77 \| moderate	23.499 \| fine	102.976 \| fine	18.385 \| good	0.244 \| good	11.098 \| good	0.29 \| good
2025-09-06T11:00:00.000Z	77 \| moderate	23.3 \| fine	102.969 \| fine	13.625 \| good	0.268 \| good	8.822 \| good	0.245 \| good
2025-09-06T12:00:00.000Z	77 \| moderate	23.299 \| fine	102.975 \| fine	14.674 \| good	0.387 \| good	7.431 \| good	0.245 \| good
2025-09-06T13:00:00.000Z	77 \| moderate	23.1 \| fine	100.988 \| fine	18.384 \| good	0.527 \| good	8.959 \| good	0.333 \| good
2025-09-06T14:00:00.000Z	77 \| moderate	23.2 \| fine	100.983 \| fine	15.807 \| good	0.778 \| good	8.393 \| good	0.333 \| good
2025-09-06T15:00:00.000Z	77 \| moderate	23.1 \| fine	100.979 \| fine	22.83 \| good	0.995 \| good	7.5 \| good	0.312 \| good
2025-09-06T16:00:00.000Z	77 \| moderate	23.101 \| fine	100.97 \| fine	27.511 \| good	1.301 \| good	7.873 \| good	0.29 \| good
2025-09-06T16:00:00.000Z	77 \| moderate	23.101 \| fine	100.97 \| fine	27.511 \| good	1.301 \| good	7.873 \| good	0.29 \| good
2025-09-06T17:00:00.000Z	69 \| moderate	18.852 \| fine	82.696 \| fine	46.094 \| good	0.979 \| good	3.813 \| good	0.249 \| good
2025-09-06T18:00:00.000Z	71 \| moderate	20.148 \| fine	88.879 \| fine	51.174 \| good	1.178 \| good	2.699 \| good	0.233 \| good
2025-09-06T19:00:00.000Z	77 \| moderate	22.887 \| fine	99.963 \| fine	57.21 \| fine	1.097 \| good	2.226 \| good	0.228 \| good
2025-09-06T20:00:00.000Z	77 \| moderate	21.188 \| fine	92.935 \| fine	62.731 \| fine	1.016 \| good	1.752 \| good	0.223 \| good
2025-09-06T21:00:00.000Z	71 \| moderate	19.071 \| fine	83.978 \| fine	60.535 \| fine	0.935 \| good	1.279 \| good	0.218 \| good
2025-09-06T22:00:00.000Z	69 \| moderate	18.613 \| fine	82.163 \| fine	58.331 \| fine	0.902 \| good	1.648 \| good	0.218 \| good
2025-09-06T23:00:00.000Z	75 \| moderate	22.435 \| fine	97.977 \| fine	58.657 \| fine	0.869 \| good	2.017 \| good	0.218 \| good
2025-09-07T00:00:00.000Z	81 \| moderate	24.639 \| fine	107.658 \| fine	54.674 \| good	0.836 \| good	2.386 \| good	0.217 \| good
2025-09-07T01:00:00.000Z	84 \| moderate	26.998 \| fine	117.2 \| fine	42.167 \| good	0.864 \| good	5.917 \| good	0.251 \| good
2025-09-07T02:00:00.000Z	84 \| moderate	27.256 \| fine	118.779 \| fine	36.278 \| good	0.893 \| good	9.449 \| good	0.284 \| good
2025-09-07T03:00:00.000Z	79 \| moderate	24.163 \| fine	105.67 \| fine	32.312 \| good	0.921 \| good	12.98 \| good	0.317 \| good
2025-09-07T04:00:00.000Z	73 \| moderate	21.184 \| fine	92.978 \| fine	34.157 \| good	0.813 \| good	13.695 \| good	0.32 \| good
2025-09-07T05:00:00.000Z	73 \| moderate	21.203 \| fine	93.115 \| fine	35.367 \| good	0.705 \| good	14.409 \| good	0.322 \| good
2025-09-07T06:00:00.000Z	73 \| moderate	21.088 \| fine	92.476 \| fine	36.637 \| good	0.597 \| good	15.124 \| good	0.325 \| good
2025-09-07T07:00:00.000Z	67 \| moderate	18.486 \| fine	81.61 \| fine	31.29 \| good	0.515 \| good	12.909 \| good	0.295 \| good
2025-09-07T08:00:00.000Z	64 \| moderate	16.334 \| fine	72.395 \| fine	29.903 \| good	0.433 \| good	10.693 \| good	0.265 \| good
2025-09-07T09:00:00.000Z	58 \| moderate	13.192 \| fine	59.501 \| fine	27.264 \| good	0.351 \| good	8.478 \| good	0.235 \| good
2025-09-07T10:00:00.000Z	58 \| moderate	13.346 \| fine	60.058 \| fine	23.197 \| good	0.309 \| good	7.515 \| good	0.219 \| good
2025-09-07T11:00:00.000Z	66 \| moderate	17.311 \| fine	76.711 \| fine	21.845 \| good	0.267 \| good	6.552 \| good	0.203 \| good
2025-09-07T12:00:00.000Z	64 \| moderate	16.284 \| fine	72.447 \| fine	24.722 \| good	0.225 \| good	5.588 \| good	0.188 \| good
2025-09-07T13:00:00.000Z	62 \| moderate	15.043 \| fine	67.371 \| fine	24.193 \| good	0.249 \| good	5.364 \| good	0.192 \| good
2025-09-07T14:00:00.000Z	62 \| moderate	14.6 \| fine	65.616 \| fine	25.085 \| good	0.273 \| good	5.139 \| good	0.196 \| good
2025-09-07T15:00:00.000Z	60 \| moderate	14.323 \| fine	64.443 \| fine	31.228 \| good	0.296 \| good	4.915 \| good	0.2 \| good
2025-09-07T16:00:00.000Z	58 \| moderate	13.162 \| fine	59.36 \| fine	39.469 \| good	0.366 \| good	3.738 \| good	0.188 \| good
2025-09-07T17:00:00.000Z	62 \| moderate	15.086 \| fine	67.734 \| fine	48.048 \| good	0.435 \| good	2.562 \| good	0.175 \| good
2025-09-07T18:00:00.000Z	66 \| moderate	16.857 \| fine	74.819 \| fine	55.889 \| fine	0.504 \| good	1.386 \| good	0.162 \| good
2025-09-07T19:00:00.000Z	71 \| moderate	19.523 \| fine	85.579 \| fine	57.61 \| fine	0.477 \| good	1.416 \| good	0.158 \| good
2025-09-07T20:00:00.000Z	67 \| moderate	15.229 \| fine	67.518 \| fine	59.65 \| fine	0.45 \| good	1.447 \| good	0.155 \| good
2025-09-07T21:00:00.000Z	60 \| moderate	13.645 \| fine	60.745 \| fine	56.736 \| fine	0.423 \| good	1.478 \| good	0.151 \| good
2025-09-07T22:00:00.000Z	56 \| moderate	11.668 \| good	51.467 \| good	56.377 \| fine	0.422 \| good	1.895 \| good	0.151 \| good
2025-09-07T23:00:00.000Z	62 \| moderate	15.295 \| fine	68.614 \| fine	57.191 \| fine	0.42 \| good	2.312 \| good	0.152 \| good
2025-09-08T00:00:00.000Z	75 \| moderate	22.019 \| fine	97.06 \| fine	54.399 \| good	0.419 \| good	2.73 \| good	0.152 \| good
2025-09-08T01:00:00.000Z	73 \| moderate	21.232 \| fine	92.978 \| fine	44.679 \| good	0.41 \| good	4.757 \| good	0.167 \| good
2025-09-08T02:00:00.000Z	62 \| moderate	14.648 \| fine	65.883 \| fine	39.655 \| good	0.401 \| good	6.785 \| good	0.181 \| good
2025-09-08T03:00:00.000Z	60 \| moderate	13.733 \| fine	61.658 \| fine	36.376 \| good	0.393 \| good	8.812 \| good	0.196 \| good
2025-09-08T04:00:00.000Z	52 \| moderate	10.448 \| good	46.187 \| good	36.321 \| good	0.373 \| good	9.236 \| good	0.196 \| good
2025-09-08T05:00:00.000Z	56 \| moderate	11.987 \| good	54.145 \| good	36.267 \| good	0.354 \| good	9.659 \| good	0.196 \| good
2025-09-08T06:00:00.000Z	54 \| moderate	11.14 \| good	49.268 \| good	36.46 \| good	0.335 \| good	10.083 \| good	0.196 \| good
2025-09-08T07:00:00.000Z	49 \| good	9.323 \| good	41.544 \| good	36.802 \| good	0.298 \| good	9.171 \| good	0.184 \| good
2025-09-08T08:00:00.000Z	54 \| moderate	11.409 \| good	50.148 \| good	41.434 \| good	0.261 \| good	8.259 \| good	0.173 \| good
2025-09-08T09:00:00.000Z	49 \| good	8.62 \| good	37.942 \| good	38.892 \| good	0.224 \| good	7.347 \| good	0.162 \| good
2025-09-08T10:00:00.000Z	49 \| good	8.734 \| good	38.028 \| good	34.278 \| good	0.22 \| good	6.629 \| good	0.153 \| good
2025-09-08T11:00:00.000Z	56 \| moderate	11.791 \| good	52.549 \| good	34.987 \| good	0.216 \| good	5.911 \| good	0.145 \| good
2025-09-08T12:00:00.000Z	56 \| moderate	11.864 \| good	52.593 \| good	31.953 \| good	0.213 \| good	5.193 \| good	0.136 \| good
2025-09-08T13:00:00.000Z	58 \| moderate	12.865 \| fine	58.074 \| fine	31.376 \| good	0.239 \| good	4.895 \| good	0.142 \| good
2025-09-08T14:00:00.000Z	58 \| moderate	12.676 \| fine	56.992 \| fine	32.969 \| good	0.265 \| good	4.596 \| good	0.147 \| good
2025-09-08T15:00:00.000Z	56 \| moderate	11.74 \| good	51.586 \| good	39.678 \| good	0.291 \| good	4.297 \| good	0.152 \| good
2025-09-08T16:00:00.000Z	56 \| moderate	11.795 \| good	51.821 \| good	46.564 \| good	0.328 \| good	3.09 \| good	0.135 \| good

Longmont

Empower business decisions with accurate air quality data

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

0.32ppm

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 09:00:00 on 2025-09-06.

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

The best air quality in Longmont, Colorado was recorded at 03:00:00 on 2025-09-06.

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

The real-time air quality index in Longmont, Colorado is 77, currently categorized as Moderate.

Which pollutant is found most often in Longmont, Colorado?

The most common pollutant in Longmont, Colorado is PM2.5.

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 23.101 μg/m³.

What are the current PM₁₀ levels at Longmont, Colorado?

The current PM₁₀ levels in Longmont, Colorado are 100.97 μg/m³.

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

The current carbon monoxide (CO) level in Longmont, Colorado is 0.29 ppm.

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

The current sulfur dioxide (SO₂) levels in Longmont, Colorado are 1.301 ppb.

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

The current ozone (O₃) levels at Longmont, Colorado is 27.511 ppm.

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

The current nitrogen dioxide (NO₂) levels at Longmont, Colorado is 7.873 ppb.

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Time	AQI	PM_2.5	PM₁₀	O₃	SO₂	NO₂	CO
2025-09-04T17:00:00.000Z	66 \| moderate	16.5 \| fine	72.988 \| fine	45.075 \| good	0.612 \| good	11.064 \| good	0.236 \| good
2025-09-04T18:00:00.000Z	67 \| moderate	18.101 \| fine	80.976 \| fine	43.313 \| good	0.591 \| good	7.144 \| good	0.243 \| good
2025-09-04T19:00:00.000Z	73 \| moderate	21.202 \| fine	92.972 \| fine	57.033 \| fine	0.341 \| good	4.288 \| good	0.261 \| good
2025-09-04T20:00:00.000Z	79 \| moderate	23.601 \| fine	102.972 \| fine	61.389 \| fine	0.535 \| good	5.56 \| good	0.263 \| good
2025-09-04T21:00:00.000Z	87 \| moderate	23.202 \| fine	100.972 \| fine	65.891 \| fine	0.509 \| good	2.571 \| good	0.264 \| good
2025-09-04T22:00:00.000Z	71 \| moderate	20.306 \| fine	88.987 \| fine	58.196 \| fine	0.446 \| good	12.305 \| good	0.298 \| good
2025-09-04T23:00:00.000Z	69 \| moderate	19.408 \| fine	84.985 \| fine	56.301 \| fine	0.419 \| good	7.764 \| good	0.277 \| good
2025-09-05T00:00:00.000Z	82 \| moderate	25.899 \| fine	112.968 \| fine	58.642 \| fine	0.477 \| good	9.118 \| good	0.322 \| good
2025-09-05T01:00:00.000Z	137 \| sensitive	50.183 \| moderate	226.89 \| moderate	48.34 \| good	0.385 \| good	10.048 \| good	0.358 \| good
2025-09-05T02:00:00.000Z	140 \| sensitive	51.486 \| moderate	232.877 \| moderate	61.093 \| fine	0.51 \| good	7.829 \| good	0.383 \| good
2025-09-05T03:00:00.000Z	139 \| sensitive	50.696 \| moderate	228.913 \| moderate	56.449 \| fine	0.416 \| good	6.347 \| good	0.338 \| good
2025-09-05T04:00:00.000Z	130 \| sensitive	47.398 \| moderate	212.93 \| moderate	43.758 \| good	0.417 \| good	8.265 \| good	0.269 \| good
2025-09-05T05:00:00.000Z	110 \| sensitive	38.502 \| moderate	168.946 \| moderate	40.185 \| good	0.417 \| good	6.456 \| good	0.245 \| good
2025-09-05T06:00:00.000Z	98 \| moderate	34.401 \| fine	148.981 \| fine	47.253 \| good	0.417 \| good	2.318 \| good	0.245 \| good
2025-09-05T07:00:00.000Z	94 \| moderate	32.004 \| fine	138.97 \| fine	36.734 \| good	0.258 \| good	2.036 \| good	0.224 \| good
2025-09-05T08:00:00.000Z	90 \| moderate	30.301 \| fine	130.963 \| fine	33.353 \| good	0.293 \| good	2.909 \| good	0.224 \| good
2025-09-05T09:00:00.000Z	86 \| moderate	28.102 \| fine	122.977 \| fine	32.126 \| good	0.254 \| good	4.999 \| good	0.245 \| good
2025-09-05T10:00:00.000Z	82 \| moderate	26.202 \| fine	114.98 \| fine	30.815 \| good	0.298 \| good	5.409 \| good	0.2 \| good
2025-09-05T11:00:00.000Z	81 \| moderate	24.801 \| fine	108.984 \| fine	24.752 \| good	0.323 \| good	5.688 \| good	0.224 \| good
2025-09-05T12:00:00.000Z	77 \| moderate	23.301 \| fine	102.977 \| fine	29.858 \| good	0.29 \| good	7.496 \| good	0.224 \| good
2025-09-05T13:00:00.000Z	75 \| moderate	22.401 \| fine	98.988 \| fine	30.507 \| good	0.262 \| good	7.199 \| good	0.224 \| good
2025-09-05T14:00:00.000Z	77 \| moderate	22.5 \| fine	98.978 \| fine	34.085 \| good	0.195 \| good	6.491 \| good	0.2 \| good
2025-09-05T15:00:00.000Z	77 \| moderate	22.801 \| fine	100.973 \| fine	36.295 \| good	0.184 \| good	6.402 \| good	0.245 \| good
2025-09-05T16:00:00.000Z	75 \| moderate	22 \| fine	96.977 \| fine	34.174 \| good	0.314 \| good	6.126 \| good	0.269 \| good
2025-09-05T17:00:00.000Z	73 \| moderate	21.101 \| fine	92.982 \| fine	36.863 \| good	0.255 \| good	5.319 \| good	0.221 \| good
2025-09-05T18:00:00.000Z	73 \| moderate	20.901 \| fine	92.974 \| fine	38.104 \| good	0.253 \| good	5.706 \| good	0.245 \| good
2025-09-05T19:00:00.000Z	73 \| moderate	21.101 \| fine	92.979 \| fine	38.202 \| good	0.418 \| good	6.302 \| good	0.221 \| good
2025-09-05T20:00:00.000Z	73 \| moderate	21.1 \| fine	92.977 \| fine	38.888 \| good	0.379 \| good	8.257 \| good	0.29 \| good
2025-09-05T21:00:00.000Z	73 \| moderate	21.2 \| fine	92.975 \| fine	40.675 \| good	0.318 \| good	7.658 \| good	0.29 \| good
2025-09-05T22:00:00.000Z	73 \| moderate	21.301 \| fine	92.982 \| fine	41.393 \| good	0.347 \| good	7.116 \| good	0.221 \| good
2025-09-05T23:00:00.000Z	73 \| moderate	21.3 \| fine	92.984 \| fine	41.341 \| good	0.313 \| good	7.632 \| good	0.245 \| good
2025-09-06T00:00:00.000Z	73 \| moderate	21.301 \| fine	92.973 \| fine	39.851 \| good	0.345 \| good	9.269 \| good	0.267 \| good
2025-09-06T01:00:00.000Z	73 \| moderate	21.3 \| fine	92.979 \| fine	39.131 \| good	0.347 \| good	10.511 \| good	0.309 \| good
2025-09-06T02:00:00.000Z	73 \| moderate	21.3 \| fine	92.989 \| fine	34.541 \| good	0.287 \| good	10.995 \| good	0.331 \| good
2025-09-06T03:00:00.000Z	73 \| moderate	21.299 \| fine	92.983 \| fine	33.711 \| good	0.23 \| good	13.233 \| good	0.378 \| good
2025-09-06T04:00:00.000Z	77 \| moderate	22.898 \| fine	100.975 \| fine	31 \| good	0.344 \| good	12.253 \| good	0.336 \| good
2025-09-06T05:00:00.000Z	79 \| moderate	24.098 \| fine	104.973 \| fine	24.421 \| good	0.327 \| good	12.747 \| good	0.426 \| good
2025-09-06T06:00:00.000Z	79 \| moderate	24.498 \| fine	106.978 \| fine	21.473 \| good	0.253 \| good	18.193 \| good	0.424 \| good
2025-09-06T07:00:00.000Z	79 \| moderate	24.299 \| fine	106.978 \| fine	22.115 \| good	0.348 \| good	18.903 \| good	0.423 \| good
2025-09-06T08:00:00.000Z	79 \| moderate	23.898 \| fine	104.969 \| fine	18.753 \| good	0.382 \| good	17.005 \| good	0.354 \| good
2025-09-06T09:00:00.000Z	79 \| moderate	23.599 \| fine	102.969 \| fine	17.949 \| good	0.275 \| good	13.26 \| good	0.333 \| good
2025-09-06T10:00:00.000Z	77 \| moderate	23.499 \| fine	102.976 \| fine	18.385 \| good	0.244 \| good	11.098 \| good	0.29 \| good
2025-09-06T11:00:00.000Z	77 \| moderate	23.3 \| fine	102.969 \| fine	13.625 \| good	0.268 \| good	8.822 \| good	0.245 \| good
2025-09-06T12:00:00.000Z	77 \| moderate	23.299 \| fine	102.975 \| fine	14.674 \| good	0.387 \| good	7.431 \| good	0.245 \| good
2025-09-06T13:00:00.000Z	77 \| moderate	23.1 \| fine	100.988 \| fine	18.384 \| good	0.527 \| good	8.959 \| good	0.333 \| good
2025-09-06T14:00:00.000Z	77 \| moderate	23.2 \| fine	100.983 \| fine	15.807 \| good	0.778 \| good	8.393 \| good	0.333 \| good
2025-09-06T15:00:00.000Z	77 \| moderate	23.1 \| fine	100.979 \| fine	22.83 \| good	0.995 \| good	7.5 \| good	0.312 \| good
2025-09-06T16:00:00.000Z	77 \| moderate	23.101 \| fine	100.97 \| fine	27.511 \| good	1.301 \| good	7.873 \| good	0.29 \| good
2025-09-06T16:00:00.000Z	77 \| moderate	23.101 \| fine	100.97 \| fine	27.511 \| good	1.301 \| good	7.873 \| good	0.29 \| good
2025-09-06T17:00:00.000Z	69 \| moderate	18.852 \| fine	82.696 \| fine	46.094 \| good	0.979 \| good	3.813 \| good	0.249 \| good
2025-09-06T18:00:00.000Z	71 \| moderate	20.148 \| fine	88.879 \| fine	51.174 \| good	1.178 \| good	2.699 \| good	0.233 \| good
2025-09-06T19:00:00.000Z	77 \| moderate	22.887 \| fine	99.963 \| fine	57.21 \| fine	1.097 \| good	2.226 \| good	0.228 \| good
2025-09-06T20:00:00.000Z	77 \| moderate	21.188 \| fine	92.935 \| fine	62.731 \| fine	1.016 \| good	1.752 \| good	0.223 \| good
2025-09-06T21:00:00.000Z	71 \| moderate	19.071 \| fine	83.978 \| fine	60.535 \| fine	0.935 \| good	1.279 \| good	0.218 \| good
2025-09-06T22:00:00.000Z	69 \| moderate	18.613 \| fine	82.163 \| fine	58.331 \| fine	0.902 \| good	1.648 \| good	0.218 \| good
2025-09-06T23:00:00.000Z	75 \| moderate	22.435 \| fine	97.977 \| fine	58.657 \| fine	0.869 \| good	2.017 \| good	0.218 \| good
2025-09-07T00:00:00.000Z	81 \| moderate	24.639 \| fine	107.658 \| fine	54.674 \| good	0.836 \| good	2.386 \| good	0.217 \| good
2025-09-07T01:00:00.000Z	84 \| moderate	26.998 \| fine	117.2 \| fine	42.167 \| good	0.864 \| good	5.917 \| good	0.251 \| good
2025-09-07T02:00:00.000Z	84 \| moderate	27.256 \| fine	118.779 \| fine	36.278 \| good	0.893 \| good	9.449 \| good	0.284 \| good
2025-09-07T03:00:00.000Z	79 \| moderate	24.163 \| fine	105.67 \| fine	32.312 \| good	0.921 \| good	12.98 \| good	0.317 \| good
2025-09-07T04:00:00.000Z	73 \| moderate	21.184 \| fine	92.978 \| fine	34.157 \| good	0.813 \| good	13.695 \| good	0.32 \| good
2025-09-07T05:00:00.000Z	73 \| moderate	21.203 \| fine	93.115 \| fine	35.367 \| good	0.705 \| good	14.409 \| good	0.322 \| good
2025-09-07T06:00:00.000Z	73 \| moderate	21.088 \| fine	92.476 \| fine	36.637 \| good	0.597 \| good	15.124 \| good	0.325 \| good
2025-09-07T07:00:00.000Z	67 \| moderate	18.486 \| fine	81.61 \| fine	31.29 \| good	0.515 \| good	12.909 \| good	0.295 \| good
2025-09-07T08:00:00.000Z	64 \| moderate	16.334 \| fine	72.395 \| fine	29.903 \| good	0.433 \| good	10.693 \| good	0.265 \| good
2025-09-07T09:00:00.000Z	58 \| moderate	13.192 \| fine	59.501 \| fine	27.264 \| good	0.351 \| good	8.478 \| good	0.235 \| good
2025-09-07T10:00:00.000Z	58 \| moderate	13.346 \| fine	60.058 \| fine	23.197 \| good	0.309 \| good	7.515 \| good	0.219 \| good
2025-09-07T11:00:00.000Z	66 \| moderate	17.311 \| fine	76.711 \| fine	21.845 \| good	0.267 \| good	6.552 \| good	0.203 \| good
2025-09-07T12:00:00.000Z	64 \| moderate	16.284 \| fine	72.447 \| fine	24.722 \| good	0.225 \| good	5.588 \| good	0.188 \| good
2025-09-07T13:00:00.000Z	62 \| moderate	15.043 \| fine	67.371 \| fine	24.193 \| good	0.249 \| good	5.364 \| good	0.192 \| good
2025-09-07T14:00:00.000Z	62 \| moderate	14.6 \| fine	65.616 \| fine	25.085 \| good	0.273 \| good	5.139 \| good	0.196 \| good
2025-09-07T15:00:00.000Z	60 \| moderate	14.323 \| fine	64.443 \| fine	31.228 \| good	0.296 \| good	4.915 \| good	0.2 \| good
2025-09-07T16:00:00.000Z	58 \| moderate	13.162 \| fine	59.36 \| fine	39.469 \| good	0.366 \| good	3.738 \| good	0.188 \| good
2025-09-07T17:00:00.000Z	62 \| moderate	15.086 \| fine	67.734 \| fine	48.048 \| good	0.435 \| good	2.562 \| good	0.175 \| good
2025-09-07T18:00:00.000Z	66 \| moderate	16.857 \| fine	74.819 \| fine	55.889 \| fine	0.504 \| good	1.386 \| good	0.162 \| good
2025-09-07T19:00:00.000Z	71 \| moderate	19.523 \| fine	85.579 \| fine	57.61 \| fine	0.477 \| good	1.416 \| good	0.158 \| good
2025-09-07T20:00:00.000Z	67 \| moderate	15.229 \| fine	67.518 \| fine	59.65 \| fine	0.45 \| good	1.447 \| good	0.155 \| good
2025-09-07T21:00:00.000Z	60 \| moderate	13.645 \| fine	60.745 \| fine	56.736 \| fine	0.423 \| good	1.478 \| good	0.151 \| good
2025-09-07T22:00:00.000Z	56 \| moderate	11.668 \| good	51.467 \| good	56.377 \| fine	0.422 \| good	1.895 \| good	0.151 \| good
2025-09-07T23:00:00.000Z	62 \| moderate	15.295 \| fine	68.614 \| fine	57.191 \| fine	0.42 \| good	2.312 \| good	0.152 \| good
2025-09-08T00:00:00.000Z	75 \| moderate	22.019 \| fine	97.06 \| fine	54.399 \| good	0.419 \| good	2.73 \| good	0.152 \| good
2025-09-08T01:00:00.000Z	73 \| moderate	21.232 \| fine	92.978 \| fine	44.679 \| good	0.41 \| good	4.757 \| good	0.167 \| good
2025-09-08T02:00:00.000Z	62 \| moderate	14.648 \| fine	65.883 \| fine	39.655 \| good	0.401 \| good	6.785 \| good	0.181 \| good
2025-09-08T03:00:00.000Z	60 \| moderate	13.733 \| fine	61.658 \| fine	36.376 \| good	0.393 \| good	8.812 \| good	0.196 \| good
2025-09-08T04:00:00.000Z	52 \| moderate	10.448 \| good	46.187 \| good	36.321 \| good	0.373 \| good	9.236 \| good	0.196 \| good
2025-09-08T05:00:00.000Z	56 \| moderate	11.987 \| good	54.145 \| good	36.267 \| good	0.354 \| good	9.659 \| good	0.196 \| good
2025-09-08T06:00:00.000Z	54 \| moderate	11.14 \| good	49.268 \| good	36.46 \| good	0.335 \| good	10.083 \| good	0.196 \| good
2025-09-08T07:00:00.000Z	49 \| good	9.323 \| good	41.544 \| good	36.802 \| good	0.298 \| good	9.171 \| good	0.184 \| good
2025-09-08T08:00:00.000Z	54 \| moderate	11.409 \| good	50.148 \| good	41.434 \| good	0.261 \| good	8.259 \| good	0.173 \| good
2025-09-08T09:00:00.000Z	49 \| good	8.62 \| good	37.942 \| good	38.892 \| good	0.224 \| good	7.347 \| good	0.162 \| good
2025-09-08T10:00:00.000Z	49 \| good	8.734 \| good	38.028 \| good	34.278 \| good	0.22 \| good	6.629 \| good	0.153 \| good
2025-09-08T11:00:00.000Z	56 \| moderate	11.791 \| good	52.549 \| good	34.987 \| good	0.216 \| good	5.911 \| good	0.145 \| good
2025-09-08T12:00:00.000Z	56 \| moderate	11.864 \| good	52.593 \| good	31.953 \| good	0.213 \| good	5.193 \| good	0.136 \| good
2025-09-08T13:00:00.000Z	58 \| moderate	12.865 \| fine	58.074 \| fine	31.376 \| good	0.239 \| good	4.895 \| good	0.142 \| good
2025-09-08T14:00:00.000Z	58 \| moderate	12.676 \| fine	56.992 \| fine	32.969 \| good	0.265 \| good	4.596 \| good	0.147 \| good
2025-09-08T15:00:00.000Z	56 \| moderate	11.74 \| good	51.586 \| good	39.678 \| good	0.291 \| good	4.297 \| good	0.152 \| good
2025-09-08T16:00:00.000Z	56 \| moderate	11.795 \| good	51.821 \| good	46.564 \| good	0.328 \| good	3.09 \| good	0.135 \| 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?