Research Article Advance Publication
Commuting-Adjusted Short-Term Health Impact Assessment of Airborne Fine Particles with Uncertainty Quantification via Monte Carlo Simulation
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Citation: Baccini M, Grisotto L, Catelan D, Consonni D, Bertazzi PA, Biggeri A. Commuting-Adjusted Short-Term Health Impact Assessment of Airborne Fine Particles with Uncertainty Quantification via Monte Carlo Simulation. Environ Health Perspect; http://dx.doi.org/10.1289/ehp.1408218.
Received: 4 February 2014
Accepted: 15 October 2014
Advance Publication: 17 October 2014
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Abstract
Background: Exposure to air pollution is associated with a short-term increase in mortality and the interest in this field has moved to health impact assessment.
Objectives: The aim is to estimate the impact of PM10 on mortality within two days from the exposure in the Italian region of Lombardy for the year 2007, at the municipality level, considering exposure entailed by daily inter-municipality commuting and accounting for uncertainty propagation.
Methods: We combined data from different sources to derive probabilistic distributions for all input quantities used to calculate attributable deaths (mortality rates, PM10 concentrations, estimated PM10 effects, and commuting flows) and applied a Monte Carlo procedure to propagate uncertainty and sample the distribution of attributable deaths for each municipality.
Results: We estimated that annual average PM10 concentrations above the WHO recommended threshold of 20 µg/m3 were responsible of 865 short-term deaths (80% Credibility Interval: 475, 1401), 26% of which were attributable to PM10 above the EU limit of 40 µg/m3. Reducing annual average PM10 concentrations >20 µg/m3 by 20% would have reduced attributable deaths by 36%. The largest estimated impacts were along the basin of the Po river and in the largest cities. Commuting contributed to the spatial distribution of the estimated impact.
Conclusions: Our estimates, which incorporated uncertainty quantification, indicate that the short-term impact of PM10 on mortality in Lombardy in 2007 was notable, and that air pollution reduction would have had a substantial beneficial effect on population health. Using commuting data helped to identify critical areas for prioritizing intervention.
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