Diesel is the main problem

EDITOR,—David V Bates's call for new clean air legislation in Britain1 is made more urgent by the results of the two London based studies published in the same issue that show the relation between air pollution, daily mortality, and childhood wheezing.2 3 Ozone and particulates are most strongly related to daily mortality,2 while ozone and sulphur dioxide are most strongly related to childhood wheezing, though the study by Roger Buchdahl and colleagues did not measure particulate levels.3 Unfortunately, particulates are also carcinogenic and are …