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T Sandström, F J Kelly. Traffic-related air pollution, genetics and asthma development in children. Thorax 2009;64:98–99. Reference 6 in this editorial is incorrect, it should be Salam MT, Lin P-L, Avol EL, et al. Microsomal epoxide hydrolase, glutathione S-transferase P1, traffic and childhood asthma. Thorax 2007;62:1050–7.