Six people received medical treatment Sunday morning after the smell of carbon monoxide was detected at The Courtney at Bay Pines Apartments in St Petersburg, officials said.
Firefighters responded to a call at the apartment complex on Miramar Drive about 8:30 a.m.
When firefighters arrived, they determined a high level of carbon monoxide at Building G.
It was determined a vehicle was left running in a garage overnight.
Forty apartment units were evacuated.
Four people were taken to the hospital for treatment. Two others were treated on scene.
Everyone is expected to make a full recovery.
Carbon monoxide is a colorless gas which can be fatal.
Residents were allowed to return to their apartments by late Sunday morning.
