Grand County—Current Conditions
September 26, 2023 6:00 AM (updated hourly)
PM 2.514 µg/m3
As with temperature, air pollution varies throughout the day.
Smoke from wild fires could cause high concentrations of particulates in populated areas. If smoke becomes thick, persons with existing heart or respiratory ailments should reduce physical exertion and outdoor activity. Wild Fire Outlooks
The data displayed on this page represents the current air pollution levels and meteorological values, and is not quality assured. For quality assured data please visit https://www.epa.gov/outdoor-air-quality-data.
Particulate matter (PM), also known as particle pollution, is a complex mixture of extremely small dust and soot particles. For more information visit Air Pollutants: Particulate Matter.
Ozone (O3) is formed when hydrocarbons and nitrogen oxides chemically react in the presence of sunlight and heat. For more information visit Air Pollutants: Ozone.
|Air Quality Index (AQI)||PM 2.5||Ozone|
|Good||0 - 12.0 µg/m3||0 - 0.054 ppm|
|Moderate||12.1 - 35.4 µg/m3||0.055 - 0.070 ppm|
|Unhealthy for Sensitive Groups||35.5 - 55.4 µg/m3||0.071 - 0.085 ppm|
|Unhealthy||55.5 - 150.4 µg/m3||0.086 - 0.105 ppm|
|Very Unhealthy||150.5 - 250.4 µg/m3||0.106 - 0.200 ppm|
|Hazardous||Above 250.5 µg/m3||Above 0.201 ppm|
|Based on a 24-hour average.||Based on an 8-hour average.|