Florida Air Quality Guide: AQI, Ozone, Saharan Dust, Prescribed Burns

Last updated May 20, 2026 · 9 min read

Florida's air quality story isn't dominated by the things people associate with bad air. There's no large industrial corridor, no Bay Area marine inversion, no western wildfire-driven peak. What Florida does have: a long summer ozone season, regular Saharan dust intrusions in June and July, seasonal agricultural and prescribed burns, and — periodically — coastal red tide aerosols that don't show up in the AQI at all. This guide is for Florida families who want to make sense of the patterns specific to where they live.

The Florida AQI calendar at a glance

Florida summer ozone

Ground-level ozone forms when NOₓ from vehicles, power plants, and industrial sources reacts with volatile organic compounds in sunlight. Florida's long, hot, sunny summers and persistent stagnant high-pressure systems create perfect ozone conditions from late spring through fall. The Orlando, Tampa, and Jacksonville metros all see periodic AQI 100+ readings driven exclusively by ozone — there's no smoke, no haze, no obvious tell. The number is just elevated.

Ozone has a near-vertical concentration profile: it forms in sunlight, peaks mid-afternoon, and drops off after sunset. The healthiest time to exercise outdoors during a Florida summer is between dawn and about 10 a.m., and again after dark. The midday-to-evening window is where ozone bites.

Saharan dust

Two or three times per summer, a plume of mineral dust from the Sahara Desert traverses the Atlantic and reaches Florida. NOAA tracks these events as the Saharan Air Layer (SAL). The dust is mostly silicate minerals plus iron oxides — different chemistry from wildfire smoke, but the practical effect on AQI is similar because both events drive PM10 and (to a lesser extent) PM2.5. SAL events also dampen tropical-cyclone formation, which is the meteorological silver lining.

Practical impact for Florida residents: orange to red AQI for 2–4 days during a moderate event, longer for a severe one. The sky takes on a milky haze. People with asthma, COPD, and severe allergies notice immediately. The mitigations are the same as for any PM event — see our Wildfire Smoke guide for the protections that actually work (they generalize to dust).

Sugar-cane burns and the Glades

In the Everglades Agricultural Area (EAA) south of Lake Okeechobee, sugar cane is harvested by burning the leaves off the stalk before cutting. The practice is regulated by the Florida Forest Service and limited by daily burn-permit weather conditions, but it produces measurable PM2.5 spikes in nearby communities — Belle Glade, Pahokee, and South Bay most directly — during the October–April harvest season. Wind-direction-dependent days can push smoke into the Lake Worth Beach and West Palm Beach areas as well. A long-running advocacy effort has pushed for green harvesting (no burn) but the practice persists. If you live downwind of the EAA, AirNow's nearest monitors and Smog Report's location-based readout are useful — burns are scheduled, but downwind dispersion is unpredictable.

Prescribed burns

Florida burns more acreage in prescribed fires than any other state in the lower 48 — roughly 2 million acres a year. Most of it is conservation-driven (longleaf pine ecosystem maintenance, fuel-load reduction, listed-species habitat management). The FDACS Florida Forest Service publishes daily burn maps. Most prescribed burns are too small to push regional AQI but can spike PM2.5 within a few miles for several hours. Suburban communities adjacent to state forests and conservation lands — particularly in north Florida, central Florida, and the panhandle — see this regularly during the December–April burn window.

Red tide aerosols (not in AQI)

The Karenia brevis algal bloom periodically produces brevetoxins — neurotoxins that aerosolize in the surf and reach onshore beachgoers. The exposure causes airway irritation, cough, and sometimes more serious respiratory symptoms in people with asthma. Red-tide aerosols are not part of the criteria-pollutant AQI, which is calibrated for the six EPA-regulated pollutants only — see our Common Air Pollutants guide for what the AQI covers and doesn't. The Florida Department of Health publishes a Red Tide Daily Sample Report and FWC tracks the bloom directly. If you live on the Gulf Coast or southwest Florida, that's a parallel data stream worth watching independently of AirNow.

Indoor air in Florida

Florida's combination of high humidity, year-round air-conditioning, and frequent power outages from tropical weather creates an indoor-air profile that's specific to the state. Dust mites, mold spores (especially Aspergillus and Cladosporium), and indoor humidity all run higher than the national average. Our Indoor Air Quality guide covers the general principles; Florida-specific additions: keep relative humidity below 60% (an indoor hygrometer is cheap), inspect AC condensate drain lines twice a year, and consider a dedicated dehumidifier in finished basements and Florida-room additions.

Resources for Florida families

• AirNow + Smog Report — real-time AQI from EPA monitors. Florida has roughly 50 regulatory monitoring sites; coverage is good in major metros, sparser in rural panhandle and Big Bend.
• Florida DEP Air Resource Management — state-level air permits, annual reports, and special-event monitoring.
• FDACS Florida Forest Service — daily prescribed-burn maps and active-fire information.
• FDOH Aquatic Toxins — red-tide status and daily sample reports for Gulf Coast residents.
• Pandemic Watch — for the respiratory-illness side of the joint AQI + outbreak picture. See our AQI and Outbreaks guide for the biology.
• Sunshine State Reader — for Florida families with kids: a free iOS app for tracking the Sunshine State Young Readers Award (SSYRA) reading list. Not air-quality-related; relevant because Florida families ask about resources for kids stuck indoors during AQI events.

What about hurricane-related air quality?

Tropical-storm and hurricane events create transient air-quality issues that don't fit the AQI framework cleanly. Wind reduces ground-level pollutants during the storm itself. Post-storm, two patterns: (1) downed trees and standing water lead to mold blooms over the following weeks; (2) generator use during prolonged outages creates carbon-monoxide hotspots — every year produces preventable CO poisoning deaths from generators run too close to inhabited spaces. The fix is well-documented: generator at least 20 feet from the house, never in a garage even with the door open, working CO alarms.

Primary sources: EPA AirNow · Florida DEP Division of Air Resource Management · FDACS Florida Forest Service · Florida Department of Health · NOAA Saharan Air Layer Analysis