Is chlorine in pools similar to bromine in pools? chlorine causes asthma attacks when i swim. will a little bit of bromine in pools do the same thing in if i switch to a pool that has bromine instead? is it possible to be allergic to chlorine??

Bromine like chlorine can produce coughing from its irritant quality. It is more stable but has a collection of skin irritant effects. True allergy is primarily based on exposure to organic (living/protein) compounds. Many chemical exposures can trigger allergy like events. One local pool with too much chlorine sent dozens of non-asthma patients to the ER with bronchospasm before it was closed.