Dickerson AS, et al. - The association between occupational exposure to diesel exhaust (DE) and the probability of amyotrophic lateral sclerosis (ALS) was investigated based on the Danish National Patient Registry. A positive association with ALS and the highest quartile exposures during the 5-year lag period and 10-year lag period were noted. Findings thereby indicated an association between consistently higher exposures to DE and ALS in men; however, this association was not observed among women.