Get a monitor and contributor to air quality data in your city.
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
Air quality in Longmont
Air quality index (AQI) and PM2.5 air pollution in Longmont
3.9K people follow this city
Longmont Air Quality Map
Real-time Longmont air pollution map
AIR QUALITY DATA CONTRIBUTORS
15 Contributors
See all
Pollen
What is the pollen count in Longmont today?
 | Index | Low | |
 | Tree pollen | Low | |
 | Grass pollen | Low | |
 | Weed pollen | None |
Weather
What is the current weather in Longmont?
| Weather | Snow |
| Temperature | 32°F |
| Humidity | 94% |
| Wind | 1 mp/h |
| Pressure | 30.3 Hg |
live aqi city ranking
Real-time USA city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Bass Lake, California | 115 |
| 2 | Palm Desert, California | 114 |
| 3 | Springville, California | 76 |
| 4 | Harrisburg, Pennsylvania | 74 |
| 5 | Kamiah, Idaho | 74 |
| 6 | Winston-Salem, North Carolina | 73 |
| 7 | Greensboro, North Carolina | 71 |
| 8 | Thermal, California | 70 |
| 9 | Porterville, California | 69 |
| 10 | San Bernardino, California | 69 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
live Longmont aqi ranking
Real-time Longmont air quality ranking
| # | station | US AQI |
|---|---|---|
| 1 | Ute Creek Drive | 63 |
| 2 | South Bross Street | 59 |
| 3 | Clover Basin Consulting | 55 |
| 4 | Willis Heights | 55 |
| 5 | Hallett Peak | 53 |
| 6 | The Shores | 53 |
| 7 | Snead Court | 50 |
| 8 | Preston Drive | 41 |
| 9 | Hawthorne Place | 29 |
| 10 | Rabbit Mountain Equestrian Center | 28 |
(local time)
SEE WORLD AQI RANKING
US AQI
52
live AQI index
Moderate
Overview
What is the current air quality in Longmont?
| Air pollution level | Air quality index | Main pollutant |
|---|---|---|
| Moderate | 52 US AQI | PM2.5 |
| Pollutants | Concentration | |
|---|---|---|
| PM2.5 | 12.5µg/m³ | |
!
PM2.5
x2.5
PM2.5 concentration in Longmont is currently 2.5 times the WHO annual air quality guideline value
Health Recommendations
What is the current air quality in Longmont?
 | Sensitive groups should reduce outdoor exercise |
 | Close your windows to avoid dirty outdoor air GET A MONITOR |
 | Sensitive groups should wear a mask outdoors GET A MASK |
 | Sensitive groups should run an air purifier GET AN AIR PURIFIER |
Forecast
Longmont air quality index (AQI) forecast
| Day | Pollution level | Weather | Temperature | Wind |
|---|---|---|---|---|
| Wednesday, Apr 17 | Good 14 AQI US  | | 39.2° 32° |  8.9 mp/h |
| Thursday, Apr 18 | Good 17 AQI US | | 37.4° 32° | 6.7 mp/h |
| Friday, Apr 19 | Good 31 AQI US | | 37.4° 32° | 6.7 mp/h |
| Today | Moderate 52 AQI US | 100% | 37.4° 32° | 6.7 mp/h |
| Sunday, Apr 21 | Good 20 AQI US |  | 62.6° 33.8° | 6.7 mp/h |
| Monday, Apr 22 | Good 15 AQI US | | 73.4° 46.4° | 13.4 mp/h |
| Tuesday, Apr 23 | Good 10 AQI US |  30% | 60.8° 41° | 8.9 mp/h |
| Wednesday, Apr 24 | Good 6 AQI US |  | 78.8° 44.6° | 6.7 mp/h |
| Thursday, Apr 25 | Good 8 AQI US | 70% | 62.6° 50° | 6.7 mp/h |
| Friday, Apr 26 | Good 4 AQI US | | 68° 44.6° | 8.9 mp/h |
Interested in hourly forecast? Get the app
News
The latest air quality news and resources.
Longmont air quality data attribution
15Contributors
Government Contributor
- Anonymous
1 station
Educational Contributor
- John Baum
1 station
Individual Contributor
- 12 Anonymous contributors
12 stations
12 Anonymous Contributors
Data validated and calibrated by IQAirWhere is the cleanest air quality in Longmont?
AQI US, Metric