{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T19:01:16Z","timestamp":1792004476910,"version":"4.4.0"},"update-to":[{"DOI":"10.1371\/journal.pmed.1004395","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2024,5,10]],"date-time":"2024-05-10T00:00:00Z","timestamp":1715299200000}}],"reference-count":73,"publisher":"Public Library of Science (PLoS)","issue":"4","license":[{"start":{"date-parts":[[2024,4,26]],"date-time":"2024-04-26T00:00:00Z","timestamp":1714089600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000066","name":"National Institute of Environmental Health Sciences","doi-asserted-by":"publisher","award":["R01ES030353"],"award-info":[{"award-number":["R01ES030353"]}],"id":[{"id":"10.13039\/100000066","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosmedicine.org"],"crossmark-restriction":false},"short-container-title":["PLoS Med"],"abstract":"\nBackground<\/jats:title>\nEpidemiological findings regarding the association of particulate matter \u22642.5 \u03bcm (PM2.5<\/jats:sub>) exposure with hypertensive disorders in pregnancy (HDP) are inconsistent; evidence for HDP risk related to PM2.5<\/jats:sub> components, mixture effects, and windows of susceptibility is limited. We aimed to investigate the relationships between HDP and exposure to PM2.5<\/jats:sub> during pregnancy.<\/jats:p>\n<\/jats:sec>\n\nMethods and findings<\/jats:title>\nA large retrospective cohort study was conducted among mothers with singleton pregnancies in Kaiser Permanente Southern California from 2008 to 2017. HDP were defined by International Classification of Diseases-9\/10 (ICD-9\/10) diagnostic codes and were classified into 2 subcategories based on the severity of HDP: gestational hypertension (GH) and preeclampsia and eclampsia (PE-E). Monthly averages of PM2.5<\/jats:sub> total mass and its constituents (i.e., sulfate, nitrate, ammonium, organic matter, and black carbon) were estimated using outputs from a fine-resolution geoscience-derived model. Multilevel Cox proportional hazard models were used to fit single-pollutant models; quantile g-computation approach was applied to estimate the joint effect of PM2.5<\/jats:sub> constituents. The distributed lag model was applied to estimate the association between monthly PM2.5<\/jats:sub> exposure and HDP risk.<\/jats:p>\nThis study included 386,361 participants (30.3 \u00b1 6.1 years) with 4.8% (17,977\/373,905) GH and 5.0% (19,381\/386,361) PE-E cases, respectively. In single-pollutant models, we observed increased relative risks for PE-E associated with exposures to PM2.5<\/jats:sub> total mass [adjusted hazard ratio (HR) per interquartile range: 1.07, 95% confidence interval (CI) [1.04, 1.10] p<\/jats:italic> < 0.001], black carbon [HR = 1.12 (95% CI [1.08, 1.16] p<\/jats:italic> < 0.001)] and organic matter [HR = 1.06 (95% CI [1.03, 1.09] p<\/jats:italic> < 0.001)], but not for GH. The population attributable fraction for PE-E corresponding to the standards of the US Environmental Protection Agency (9 \u03bcg\/m3<\/jats:sup>) was 6.37%. In multi-pollutant models, the PM2.5<\/jats:sub> mixture was associated with an increased relative risk of PE-E ([HR = 1.05 (95% CI [1.03, 1.07] p<\/jats:italic> < 0.001)], simultaneous increase in PM2.5<\/jats:sub> constituents of interest by a quartile) and PM2.5<\/jats:sub> black carbon gave the greatest contribution of the overall mixture effects (71%) among all individual constituents. The susceptible window is the late first trimester and second trimester. Furthermore, the risks of PE-E associated with PM2.5<\/jats:sub> exposure were significantly higher among Hispanic and African American mothers and mothers who live in low- to middle-income neighborhoods (p<\/jats:italic> < 0.05 for Cochran\u2019s Q test). Study limitations include potential exposure misclassification solely based on residential outdoor air pollution, misclassification of disease status defined by ICD codes, the date of diagnosis not reflecting the actual time of onset, and lack of information on potential covariates and unmeasured factors for HDP.<\/jats:p>\n<\/jats:sec>\n\nConclusions<\/jats:title>\nOur findings add to the literature on associations between air pollution exposure and HDP. To our knowledge, this is the first study reporting that specific air pollution components, mixture effects, and susceptible windows of PM2.5<\/jats:sub> may affect GH and PE-E differently.<\/jats:p>\n<\/jats:sec>","DOI":"10.1371\/journal.pmed.1004395","type":"journal-article","created":{"date-parts":[[2024,4,26]],"date-time":"2024-04-26T17:38:35Z","timestamp":1714153115000},"page":"e1004395","update-policy":"https:\/\/doi.org\/10.1371\/journal.pmed.corrections_policy","source":"Crossref","is-referenced-by-count":31,"title":["Association between particulate air pollution and hypertensive disorders in pregnancy: A retrospective cohort 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Y.","family":"Chiu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6108-9198","authenticated-orcid":true,"given":"Jeff M.","family":"Slezak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3444-6476","authenticated-orcid":true,"given":"David 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