Epidemic of asthma was not associated with episode of air pollution

BMJ 1996; 312 doi: https://doi.org/10.1136/bmj.312.7046.1606b (Published 22 June 1996) Cite this as: BMJ 1996;312:1606
  1. H Ross Anderson,
  2. Richard Atkinson,
  3. Elizabeth S Limb,
  4. David P Strachan
  1. Professor of epidemiology and public health Statistician Statistician Reader in epidemiology Department of Public Health Sciences, St George's Hospital Medical School, London SW17 0RE

    EDITOR,—Are epidemics of asthma caused by outdoor air pollution or do episodes of air pollution cause epidemics of asthma? These and other questions relating to asthma and air pollution were addressed in detail by a recent report,1 but the answers emerge clearly from a simple inspection of data available for London in recent years.

    Figure 1 shows daily concentrations of nitrogen dioxide in London …

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