My prefix is a place with rounds

Question

My prefix is a place with rounds,

my infix begins like it sounds.

My suffix is a line without repetition,

overall, I transform with my emissions.

What am I?

Answer 1

Are you a

BARBECUE?

My prefix is a place with rounds,

Serving rounds at the BAR.

my infix begins like it sounds.

BE is a homophone of its initial letter B.

My suffix is a line without repetition,

A QUEUE is a line, and without repetition of letters this becomes QUE/CUE.

overall, I transform with my emissions.

The smoke from a barbecue can make a place smell different.