Environ Health Perspect. 2010 Aug 20.
Mind the Gap
Smith KR, Peel JL. University of California.
Background: Recent analysis has demonstrated a remarkably consistent, non-linear relationship between estimated inhaled dose of combustion particles measured as PM2.5 and cardiovascular disease mortality over several orders of magnitude of dose – from cigarette smoking, secondhand tobacco smoke exposure, and ambient air pollution exposure.
Objectives: Here we discuss the implications of this relationship and point out gaps in our knowledge that it reveals.
Discussions: The non-linear exposure-response relationship that is revealed – much steeper at lower than at higher doses – explains the seemingly inconsistent risks observed from ambient air pollution and cigarette smoking but also raises important questions about the relative benefits of control at different points along the curve. This analysis also reveals a gap in the evidence base along the dose-response curve between secondhand tobacco smoke and active smoking, which is the dose range experienced by half the world’s population from indoor biomass and coal burning for cooking and heating.
Conclusions: The shape of the exposure-response relationship implies much larger public health benefits of reductions at the lower end of the dose spectrum, for example from reductions in outdoor air pollution than from reducing the rate of active smoking, which seems counter-intuitive and deserving of further study because of its importance for control policies. In addition, given the potential risks and consequent global disease burden, epidemiological studies are urgently needed to quantify the cardiovascular risks of particulate matter exposures from indoor biomass burning in developing countries, which lie in the dose gap of current evidence.
