An evacuation zone has been enforced as “toxic” sulfur smoke bellows into the air from a fire in Port Adelaide.

A structure fire was burning sulphur and producing large volumes of smoke, said a warning from the South Australian Metropolitan Fire Service on Thursday.

One person was taken to the Royal Adelaide Hospital.

“Anyone located within 1 km of Moonta Rd, Port Adelaide should leave immediately,” said an alert.

“Do not enter the area – it is extremely dangerous.”

Emergency services were on scene.

For updates check the MFS website at mfs.sa.gov.au or phone the Information Hotline on 1800 362 361.