Allergic w Exercise Induced Pool contradiction

Hello!

I'm wondering if anyone else had a similar experience to me.

Background.

Allergies/Triggers - I had borderline severe to severe asthma as a child. I was hospitalized for it on at least a yearly basis until I was 9 or 10. I still have many trigger allergies to plants and molds. On rare occasion when I am cooking, I'll suffer an asthma attack.

Exercised Induced / EIA - Strenuous physical activity can be a challenge, especially in cold weather. When shoveling an inhaler always has to be on stand by. In the heat and humidity the same. For cardio, it's the same. I'd take my beta-blocker in advance 15 minutes before. I could generally make it for 5-6 minutes in any moderately strenuous activity without triggering. Cycling, Jogging, standing aerobics, punching bag, anything. I used to push jogging to 30-50 minutes hoping my asthma might get more manageable, but it did not. Having a larger lung capacity and being aerobically fit obviously do help. Low impact cardio generally triggers a mild reaction though at times it will flare up enough to that I'll be forced to stop or pass out.

Contradiction -- Swimming Pool. Humid environments tend to make breathing more difficult and has little to no effect on asthma. Yet. I could swim for long periods of time with maximal effort with minimal EIA. Some speculated it's the humidity, but if I exercise otherwise (not swimming) in a humid environment there is no noticeable improvement in EIA.

This leaves the chemical composition of the pool. It very strange since reacting chemicals in a pool usually trigger people's asthma or cause asthma rather then inhibit. This was in the early 1990s in a small school pool. The chemicals in our pool were strong and numbed the scalp to the point where we could pull out hair by the root easily without pain.

Has anyone else here had this experience besides me? What sort of chemicals in a swimming pools circa 1990s may inhibit EIA?

PS: I'm relatively certain that breathing in or being exposed to such chemicals on a continual basis would have a strongly adverse affect on long term health. Far greater then any benefit in inhibiting EIA.