Residents across central Florida woke this week to hazy skies and an urgent warning from air-quality officials: stay inside, close your windows, and avoid outdoor exertion. Fine particulate matter, the lung-penetrating pollution known as PM2.5, has surged past “Unhealthy” thresholds at multiple monitoring stations from Tampa to Orlando, putting children, older adults, and anyone with asthma or heart disease at immediate risk.
The spike comes after 14 straight weeks of emergency open-burning restrictions in Hillsborough County, a measure that underscores how dry and fire-prone conditions have become across the region heading into late spring 2026.
What monitors are showing
The EPA’s NowCast AQI map, which weights the most recent hourly PM2.5 concentrations to approximate real-time conditions, shows several Florida stations registering in the “Unhealthy” range and, at times, tipping into “Very Unhealthy” territory. Those readings are corroborated by the Florida Department of Environmental Protection’s own continuous ambient monitors, whose data appears on the agency’s statewide air-quality portal. When both federal and state instruments flag the same elevated levels simultaneously, the signal is considered reliable even though individual hourly values carry some measurement uncertainty.
The state DEP cautions that its most recent figures are preliminary and subject to quality-assurance review. A separate, longer-running issue also bears mentioning: the EPA has acknowledged data-quality problems with some historical Florida PM2.5 records, reclassifying certain measurements in its Air Quality System database pending a final validity determination. That flag applies mainly to trend analyses of past years, not to the live readings driving this week’s alerts, but it does complicate efforts to judge whether episodes like this one are growing more frequent.
Drought, fire risk, and the source question
Hillsborough County, home to Tampa and roughly 1.5 million people, extended its emergency ban on open burning on April 16, 2026. The ban has been in effect since early January, a duration that reflects how little rain the region has received and how easily wildfires, agricultural burns, and even small brush fires can inject large volumes of fine particulate into the atmosphere…