Bronchial asthma and air pollution at workplaces

Objectives This case-referent study was performed to investigate the possibility of nonspecific air pollution at workplaces increasing the risk of bronchial asthma for formerly healthy adults. Methods Seventy-nine cases of asthma, diagnosed at a lung clinic, among persons aged 20--65 years were compared with 304 referents drawn randomly from the population of the catchment area. Questionnaire information was obtained regarding occupation,...