Hurricane Isaias has brought a deadly danger that often follows big storms: carbon monoxide poisoning.

One of the deaths linked to Isaias was a person found in a closed garage with a running generator in Escambia County, Florida, The Guardian reported. Four members of that person's family were taken to the hospital with carbon monoxide poisoning, the Escambia sheriff's office said.

The BBC also reported that a man died from carbon monoxide poisoning after running a generator in a garage that was not properly ventilated.

"Don't run any generators inside your home, it can be very, very hazardous," Florida Gov. Ron DeSantis said at a news conference, according to The Guardian.

Isaias struck the Florida Panhandle and caused at least four deaths. It left hundreds of thousands of people without power, so many families are using generators.

Carbon monoxide is a gas with no color or smell. Generators, grills, stoves and furnaces can all give it off, the Centers for Disease Control and Prevention says. It can build up indoors, and people who are asleep can die from it before they feel sick. The most common symptoms are headache, dizziness, weakness, upset stomach, vomiting, chest pain and confusion.

The CDC gives these tips:

Run generators only outdoors, more than 20 feet from windows, doors and vents. Never use one inside your home or garage, even with doors and windows open. Never burn charcoal or use a portable camp stove indoors. Install battery-powered or battery backup carbon monoxide detectors near every sleeping area.

What we know: A death linked to Isaias involved a generator in a closed garage, and four relatives were hospitalized with carbon monoxide poisoning.
What we don't: How many more people have been sickened by carbon monoxide since the storm.