Reporting of air pollution levels

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6976.402b (Published 11 February 1995) Cite this as: BMJ 1995;310:402
  1. Jon G Ayres
  1. Consultant physician in respiratory medicine Department of Respiratory Medicine, Birmingham Heartlands Hospital, Birmingham B9 5SS

    EDITOR,—Two articles in the issue of 22 October reported levels of air pollutants and their possible health effects.1 2 Gregor Campbell-Hewson and colleagues refer to ozone levels being “at a two week high” and report a figure of “45 ppb, compared with a daily average of 28.7 ppb over the preceding and following weeks.”1 Was this value an hourly maximum value …

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