The effects of particulate matter sources on daily mortality: a case-crossover study of Barcelona, Spain.

Abstract:

BACKGROUND:Dozens of studies link acute exposure to particulate matter (PM) air pollution with premature mortality and morbidity, but questions remain about which species and sources in the vast PM mixture are responsible for the observed health effects. Although a few studies exist on the effects of species and sources in U.S. cities, European cities-which have a higher proportion of diesel engines and denser urban populations-have not been well characterized. Information on the effects of specific sources could aid in targeting pollution control and in articulating the biological mechanisms of PM. OBJECTIVES:Our study examined the effects of various PM sources on daily mortality for 2003 through 2007 in Barcelona, a densely populated city in the northeast corner of Spain. METHODS:Source apportionment for PM ≤ 2.5 μm and ≤ 10 µm in aerodynamic diameter (PM2.5 and PM10) using positive matrix factorization identified eight different factors. Case-crossover regression analysis was used to estimate the effects of each factor. RESULTS:Several sources of PM2.5, including vehicle exhaust, fuel oil combustion, secondary nitrate/organics, minerals, secondary sulfate/organics, and road dust, had statistically significant associations (p < 0.05) with all-cause and cardiovascular mortality. Also, in some cases relative risks for a respective interquartile range increase in concentration were higher for specific sources than for total PM2.5 mass. CONCLUSIONS:These results along with those from our multisource models suggest that traffic, sulfate from shipping and long-range transport, and construction dust are important contributors to the adverse health effects linked to PM.

authors

Ostro B,Tobias A,Querol X,Alastuey A,Amato F,Pey J,Pérez N,Sunyer J

doi

10.1289/ehp.1103618

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

1781-7

issue

12

eissn

0091-6765

issn

1552-9924

journal_volume

119

pub_type

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