This is a difficult question for which you will need expert advice from somebody who knows all your clinical details. From the information given it is unclear whether your asthma is due to a single large exposure, or whether you have become sensitised to something. Asthma following a single large exposure (chlorine being the commonest example) does not usually lead to sensitisation. In that case exposure to small concentrations of the same agent should not cause problems. If you have developed sensitisation, then repeated exposure to low levels of the same agent will often precipitate asthma. Chlorine is often blamed for swimming-pool asthma, where in fact the chloramines formed by the chlorine reacting with protein, are the most likely cause of sensitisation.
Chlorine is in common use, as you say. There must however be many occupational settings were chlorine exposure is no more common than in domestic life.
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