Associations between sources of particle number and mortality in four European cities

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Rivas , I , Vicens , L , Basagana , X , Tobias , A , Katsouyanni , K , Walton , H , Hüglin , C , Alastuey , A , Kulmala , M , Harrison , R M , Pekkanen , J , Querol , X , Sunyer , J & Kelly , F J 2021 , ' Associations between sources of particle number and mortality in four European cities ' , Environment International , vol. 155 , 106662 . https://doi.org/10.1016/j.envint.2021.106662

Title: Associations between sources of particle number and mortality in four European cities
Author: Rivas, Ioar; Vicens, Laia; Basagana, Xavier; Tobias, Aurelio; Katsouyanni, Klea; Walton, Heather; Hüglin, Christoph; Alastuey, Andres; Kulmala, Markku; Harrison, Roy M.; Pekkanen, Juha; Querol, Xavier; Sunyer, Jordi; Kelly, Frank J.
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Department of Public Health
Date: 2021-10
Language: eng
Number of pages: 10
Belongs to series: Environment International
ISSN: 0160-4120
URI: http://hdl.handle.net/10138/334812
Abstract: Background: The evidence on the association between ultrafine (UFP) particles and mortality is still inconsistent. Moreover, health effects of specific UFP sources have not been explored. We assessed the impact of UFP sources on daily mortality in Barcelona, Helsinki, London, and Zurich. Methods: UFP sources were previously identified and quantified for the four cities: daily contributions of photonucleation, two traffic sources (fresh traffic and urban, with size mode around 30 nm and 70 nm, respectively), and secondary aerosols were obtained from data from an urban background station. Different periods were investigated in each city: Barcelona 2013-2016, Helsinki 2009-2016, London 2010-2016, and Zurich 2011-2014. The associations between total particle number concentrations (PNC) and UFP sources and daily (natural, cardiovascular [CVD], and respiratory) mortality were investigated using city-specific generalized linear models (GLM) with quasi-Poisson regression. Results: We found inconsistent results across cities, sources, and lags for associations with natural, CVD, and respiratory mortality. Increased risk was observed for total PNC and natural mortality in Helsinki (lag 2; 1.3% [0.07%, 2.5%]), CVD mortality in Barcelona (lag 1; 3.7% [0.17%, 7.4%]) and Zurich (lag 0; 3.8% [0.31%, 7.4%]), and respiratory mortality in London (lag 3; 2.6% [0.84%, 4.45%]) and Zurich (lag 1; 9.4% [1.0%, 17.9%]). A similar pattern of associations between health outcomes and total PNC was followed by the fresh traffic source, for which we also found the same associations and lags as for total PNC. The urban source (mostly aged traffic) was associated with respiratory mortality in Zurich (lag 1; 12.5% [1.7%, 24.2%]) and London (lag 3; 2.4% [0.90%, 4.0%]) while the secondary source was associated with respiratory mortality in Zurich (lag 1: 12.0% [0.63%, 24.5%]) and Helsinki (4.7% [0.11%, 9.5%]). Reduced risk for the photonucleation source was observed for respiratory mortality in Barcelona (lag 2,-8.6% [-14.5%,-2.4%]) and for CVD mortality in Helsinki, as this source is present only in clean atmospheres (lag 1,-1.48 [-2.75,-0.21]). Conclusions: We found inconsistent results across cities, sources and lags for associations with natural, CVD, and respiratory mortality.
Subject: Ultrafine particles
Particle Number
Sources of Ultrafine Particles
Daily mortality
Time Series
PARTICULATE AIR-POLLUTION
HOSPITAL ADMISSIONS
NUCLEATION EVENTS
CASE-CROSSOVER
TERM EXPOSURE
FINE
MATTER
MASS
114 Physical sciences
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