Air pollution is associated with primary health care visits for asthma in Sweden : A case-crossover design with a distributed lag non-linear model
Background: Air pollution can increase the symptoms of asthma and has an acute effect on the number of emergency room visits and hospital admissions because of asthma, but little is known about the effect of air pollution on the number of primary health care (PHC) visits for asthma. Objective: To investigate the association between air pollution and the number of PHC visits for asthma in Scania, s
