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Response to Peter Joseph
  1. K Bhaskaran,
  2. S Hajat,
  3. A Haines,
  4. L Smeeth
  1. London School of Hygiene and Tropical Medicine, London, UK
  1. Correspondence to Krishnan Bhaskaran, London School of Hygiene And Tropical Medicine, Room M107, 49-51 Bedford Square, London WC1B 3DP, UK; krishnan.bhaskaran{at}

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The authors' reply: We thank Professor Joseph for his thoughtful comments on our study. As his letter points out, our review identified a number of studies that showed an apparently reduced risk of myocardial infarction associated with higher ambient ozone levels.1 Similar short-term ‘protective’ associations with ozone have been observed in studies of other outcomes—for example, cardiovascular admissions2 and general practitioner consultations for upper respiratory diseases.3 On the other …

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