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The organization between symptoms of asthma and exposure to air in cycling services has been recognized. Nonetheless, the variation in, long-lasting exposure to and management associated with the breathing irritant trichloramine (NCl3) isn't really recognized. In this research, 313 swimmers above 18 years certified by the Norwegian Swimming Association answered a questionnaire about health and swimming. The prevalence of symptoms of asthma among the most-exposed swimmers was 36%. Two services, t