Combined effect of extreme heat and particulate matter on daily mortality in mainland Portugal

Canha, Filipa; Leite, Andreia; Gaio, Vânia; das Neves Pereira da Silva, Susana

Publicação

Combined effect of extreme heat and particulate matter on daily mortality in mainland Portugal

2025-11Documento de conferência

datacite.subject.fos	Ciências Médicas
datacite.subject.sdg	03:Saúde de Qualidade
dc.contributor.author	Canha, Filipa
dc.contributor.author	Leite, Andreia
dc.contributor.author	Gaio, Vânia
dc.contributor.author	das Neves Pereira da Silva, Susana
dc.date.accessioned	2026-03-03T18:33:09Z
dc.date.available	2026-03-03T18:33:09Z
dc.date.issued	2025-11
dc.description	Abstrcat publicado em: Euro J Public Health, 2025: 35 (Suppl 4):iv384. doi:10.1093/eurpub/ckaf161.952
dc.description.abstract	Rising temperatures and air pollution in the context of climate change pose increasing health risks. Evidence suggests a synergistic effect between heat and PM, but few areas of Portugal have been studied. This study aimed to assess the interaction effect of extreme heat and PM on daily mortality across mainland Portugal. We conducted a two-stage time series analysis for the summers (May-September) from 2003 to 2023, using daily data on maximum temperature, mean PM10 and PM2.5 concentrations separately, and all-cause mortality across all mainland districts. Extreme heat and high PM levels were defined as values above the 90th percentile. To account for delayed effects, a 7-day moving average was used for PM, and distributed lag non-linear models (DLNM) with a 10-day lag for temperature. In the first stage, we estimated cumulative relative risks (cRR) of the interaction between exposures on mortality, using the minimum mortality temperature (MMT) and high PM as reference. District cRR were pooled using a random-effects meta-analysis, with the European Deprivation Index (EDI-PT) as a meta-predictor. An interaction effect between extreme heat and high PM pollution on mortality was found in most districts. cRR ranged from 1.01 (95% CI: 0.93; 1.11) to 1.35 (95% CI: 1.17; 1.56) for extreme heat and high PM2.5, and from 1.02 (95% CI: 0.86; 1.22) to 1.34 (95% CI: 1.16; 1.55) for extreme heat and PM10, compared with MMT and high PM. The overall interaction effect in mainland Portugal, for temperatures at the 90th percentile, both showed an overall cRR of 1.03 (95% CI: 1.01; 1.05). EDI-PT was excluded as it did not explain the heterogeneity between districts. There is a synergistic effect between extreme heat and PM on mortality in Portugal. This highlights the need to integrate this evidence into public health measures, enhancing health surveillance systems to better monitor and respond to the joint effects of extreme heat and air pollution.	eng
dc.identifier.uri	http://hdl.handle.net/10400.18/11086
dc.language.iso	eng
dc.peerreviewed	yes
dc.relation.hasversion	https://academic.oup.com/eurpub/article/35/Supplement_4/ckaf161.952/8302179
dc.rights.uri	N/A
dc.subject	Extreme Heat
dc.subject	Particulate Matter
dc.subject	Mortality
dc.subject	Determinantes da Saúde e da Doença
dc.title	Combined effect of extreme heat and particulate matter on daily mortality in mainland Portugal	eng
dc.type	conference object
dspace.entity.type	Publication
oaire.citation.conferenceDate	2025-11
oaire.citation.conferencePlace	Helsinki, Finland
oaire.citation.issue	Suppl 4
oaire.citation.title	18th European Public Health Conference (EPH), 12-14 november 2025
oaire.citation.volume	35
oaire.version	http://purl.org/coar/version/c_b1a7d7d4d402bcce
person.familyName	Leite
person.familyName	Gaio
person.familyName	das Neves Pereira da Silva
person.givenName	Andreia
person.givenName	Vânia
person.givenName	Susana
person.identifier	1052436
person.identifier.ciencia-id	2F10-F9A9-E8A7
person.identifier.ciencia-id	A71A-17AF-30C7
person.identifier.ciencia-id	B718-8EF6-EBD8
person.identifier.orcid	0000-0003-0843-0630
person.identifier.orcid	0000-0001-7626-4991
person.identifier.orcid	0000-0003-2524-0548
person.identifier.scopus-author-id	57109931300
person.identifier.scopus-author-id	56080468200
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relation.isAuthorOfPublication.latestForDiscovery	838ff85b-16c9-4992-b13f-e3099f916717