Live air quality index in Longmont, Colorado today
Stay updated with real-time air quality in Longmont, Colorado featuring accurate data on AQI, PM2.5, 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)
35
Good
Longmont, Colorado
Last updated: ... (Local time)
Major air pollutants in Longmont, Colorado
Good
Fine
Moderate
Poor
Very poor
Hazardous
Particulate Matter2.5 (PM2.5)
3.80 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
17.00 μg/m³
0
55
155
255
425
605+
Ozone (O3)
37.79 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.54 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
7.34 ppb
0
54
101
361
1250
2050+
Carbon Monoxide (CO)
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Longmont, Colorado
Longmont, Colorado
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Longmont, Colorado air quality map: Real-time AQI near you
Air quality in nearby cities
Gunbarrel, Colorado
AQI 36
Good
3.73μg/m³
PM2.5
13.43μg/m³
PM10
38.94ppb
O3
0.53ppb
SO2
12.00ppb
NO2
0.24ppm
CO
Erie, Colorado
AQI 34
Good
4.20μg/m³
PM2.5
9.97μg/m³
PM10
37.50ppb
O3
0.53ppb
SO2
12.75ppb
NO2
0.24ppm
CO
Firestone, Colorado
AQI 31
Good
4.42μg/m³
PM2.5
16.05μg/m³
PM10
33.29ppb
O3
0.54ppb
SO2
17.39ppb
NO2
0.23ppm
CO
Berthoud, Colorado
AQI 32
Good
4.22μg/m³
PM2.5
11.76μg/m³
PM10
35.45ppb
O3
0.55ppb
SO2
3.87ppb
NO2
0.21ppm
CO
Frederick, Colorado
AQI 31
Good
4.42μg/m³
PM2.5
16.05μg/m³
PM10
33.29ppb
O3
0.54ppb
SO2
17.39ppb
NO2
0.23ppm
CO
Lafayette, Colorado
AQI 36
Good
3.73μg/m³
PM2.5
11.80μg/m³
PM10
38.74ppb
O3
0.54ppb
SO2
12.14ppb
NO2
0.25ppm
CO
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
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 07:00:00 on 2025-06-05.
When did Longmont, Colorado have its best air quality in the last 24 hours?
The best air quality in Longmont, Colorado was recorded at 06:00:00 on 2025-06-05.
What is the real-time air quality index for Longmont, Colorado?
The real-time air quality index in Longmont, Colorado is 35, currently categorized as Good.
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 PM2.5 levels in Longmont, Colorado?
The measured PM2.5 levels in Longmont, Colorado at present are 3.8 μg/m3.
What are the current PM10 levels at Longmont, Colorado?
The current PM10 levels in Longmont, Colorado are 16.996 μg/m3.
What are the current carbon monoxide (CO) levels at Longmont, Colorado?
The current carbon monoxide (CO) level in Longmont, Colorado is 0.223 ppm.
What are the current sulfur dioxide (SO2) levels at Longmont, Colorado?
The current sulfur dioxide (SO2) levels in Longmont, Colorado are 0.539 ppb.
What are the current ozone (O3) levels at Longmont, Colorado?
The current ozone (O3) levels at Longmont, Colorado is 37.791 ppm.
What are the current nitrogen dioxide (NO2) levels at Longmont, Colorado?
The current nitrogen dioxide (NO2) levels at Longmont, Colorado is 7.337 ppb.
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