Azadur Rahman Mallik, the director of the Department of Environment (DoE), suffered burn injuries after a fire broke out at his residence in Panchlaish in the port city on Friday morning.
Jashim Uddin, deputy assistant director of Chattogram Fire Service, said the fire broke out when he was lighting a gas oven around 9am.
Fire service officials said a leakage in the gas pipeline might have sparked the fire.
Mallik was rescued and taken to a private hospital.