Help - Monitoring Sites Map Air Quality Index

CDPHE and LPHA sites
Colorado Department of Public Health and Environment (CDPHE) sites are regulatory grade sites utilizing high-end monitoring instruments. These sites undergo regular maintenance and calibration to maintain accurate monitoring data.
Local Public Health Agency (LPHA) sites often utilize high-end instruments, but may not meet the same maintenance and calibration protocols needed for regulatory rule making.

Overlapping sites
When the CDPHE and LPHA monitoring sites are co-located or at the same location, their symbols on the map will overlap. In this situation, the upper-right corner of the popup will contain left and right arrows to move between the different site's information.

Missing data
CDPHE sites populate at a few minutes after each hour. LPHA sites lag behind the CDPHE sites by a few more minutes, and do not always populate reliably. Try reloading the map at about 10 minutes after the hour, or later, to see more complete data.

Map Legend
CDPHE & LPHA monitors
Circular map symbols for CDPHE monitoring sites Circular symbols for CDPHE monitoring sites
Square map symbols for LPHA monitoring sites Square symbols for LPHA monitoring sites
 
AQI designations
Green map symbol key for good air quality AQI Good
Yellow map symbol key for moderate air quality AQI Moderate
Orange map symbol key for unhealthy-for-sensitive-groups air quality AQI Unhealthy for Sensitive Groups
Red map symbol key for unhealthy air quality AQI Unhealthy
Purple map symbol key for very unhealthy air quality AQI Very Unhealthy
Maroon map symbol key for hazardous air quality AQI Hazardous
Gray map symbol key for unavailable AQI AQI Unavailable