Letter

Heterogeneity of air pollution effects is related to average temperature

BMJ 1997; 315 doi: 10.1136/bmj.315.7116.1161 (Published 1 November 1997)
Cite this as: BMJ 1997;315:1161.1

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  1. Martin Bobak (martinb@public-health.ucl.ac.uk), Clinical lecturer in epidemiologya,
  2. Anthony Roberts, Consultant neurologistb
  1. a Department of Epidemiology and Public Health, University College London, London WC1E 6BT
  2. b 74 Harley Street, London W1N 1AE

    Editor—The APHEA project (air pollution and health: a European approach) found that the effects of daily variation in air pollution on mortality were significantly stronger in western Europe than in eastern Europe.1 The authors have put forward several explanations for this inconsistency, all of which, generally speaking, suggest that the small effects found in eastern Europe are an artefact. We propose a less dismissive explanation.

    Inspired by the Eurowinter study,2 we plotted the relative risk of death in cities in the APHEA project1 against …

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