Salt to chlorine conversion for pool
A salt water chlorinator does not produce chlorine gas (it uses the salt in the water to produce hypochlorous acid and sodium hypochlorite: source). Moreover, the process takes place under water in an enclosed container. You therefore shouldn't have any fear of harmful gases from that process.

Furthermore, the smell that poolgoers usually associate with "chlorine" isn't actually due to chlorine but to chloramines (byproducts of chlorine sanitising organics in the pool) which indicates a lack of free chlorine in the water. Because salt water chlorinators can produce free chlorine continually, you don't usually get the "chlorine" smell with salt water pools.