Millions of people in parts of Colorado and Florida are under advisories to stay inside due to toxic air quality caused by wildfire smoke and fine particulate pollution.
The National Weather Service issued an air quality health alert for 17 counties in western Colorado on Thursday, warning of wildfire smoke originating from Utah and Nevada. The alert advises residents that if smoke is thick enough to reduce visibility to less than five miles, air quality has reached unhealthy levels, and remaining indoors is recommended. Some communities under the advisory include Glenwood Springs, Vail, Aspen, Grand Junction, and Durango.
Unstable atmospheric conditions are making it difficult to predict smoke movement, with officials cautioning that air quality could deteriorate rapidly in areas with previously clear skies. Smoke concentrations may fluctuate significantly due to shifting winds.
In Florida, a separate air quality alert for fine particulate pollution (PM2.5) is in effect for much of Miami-Dade County. These microscopic particles are small enough to penetrate deep into the lungs, potentially causing irritation to the eyes and throat, exacerbating asthma and other respiratory conditions, and increasing the risk of breathing difficulties. While the specific cause for the elevated pollution in Florida was not detailed in the advisory, authorities are currently contending with at least four active wildfires in the Everglades region, west of Miami. Local forecasters indicated that shifting winds could push smoke from these fires further inland, contributing to the deteriorating air quality.
Wildfire smoke is composed of various gases, toxic chemicals, and microscopic particles, with PM2.5 being a primary health concern. The National Weather Service highlighted PM2.5 as the cause of hazardous air quality in the affected regions. While two large wildfires in South Florida were reported to be nearing full containment, the ongoing fires west of Miami continue to impact air quality.