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The Korean Health Insurance Review and Assessment Service-National Sample Cohort (HIRA-NSC) data from 2002 through 2013 were used. The 3,935 Bell\u2019s palsy patients were matched with 15,740 control participants. The meteorological data, including daily mean temperature (\u00b0C), daily mean highest temperature (\u00b0C), daily mean lowest temperature (\u00b0C), daily mean temperature difference (\u00b0C), relative humidity (%), spot atmospheric pressure (hPa), sulfur dioxide (SO<jats:sub>2<\/jats:sub>) (ppm), nitrogen dioxide (NO<jats:sub>2<\/jats:sub>) (ppm), ozone (O<jats:sub>3<\/jats:sub>) (ppm), carbon monoxide (CO) (ppm), and PM<jats:sub>10<\/jats:sub>(particulate matter \u2264 10\u2009\u03bcg\/m<jats:sup>3<\/jats:sup>) for 60 days, 30 days, 14 days, 7 days, and 3 days prior to the index date were analyzed for Bell\u2019s palsy cases and controls. Conditional logistic regression analysis was used to estimate the odds ratios (ORs) of the association between the meteorological data and Bell\u2019s palsy. The mean NO<jats:sub>2<\/jats:sub>and PM<jats:sub>10<\/jats:sub>concentrations for 60 days were higher, while that of O<jats:sub>3<\/jats:sub>was lower in the Bell\u2019s palsy group than in the control group (both P\u2009&lt;\u20090.001). The Bell\u2019s palsy group showed 16.63-fold higher odds of NO<jats:sub>2<\/jats:sub>for 60 days (0.1 ppm) than the control group (95% CI\u2009=\u200910.18\u201327.16, P\u2009&lt;\u20090.001). The ORs of PM<jats:sub>10<\/jats:sub>, and O<jats:sub>3<\/jats:sub>for 60 days showed inconsistent results according to the included variables. Bell\u2019s palsy was related to high concentrations of NO<jats:sub>2<\/jats:sub>.<\/jats:p>","DOI":"10.1038\/s41598-020-61232-7","type":"journal-article","created":{"date-parts":[[2020,3,6]],"date-time":"2020-03-06T11:02:37Z","timestamp":1583492557000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Air pollution by NO2 is associated with the risk of Bell\u2019s palsy: A nested case-controlled study"],"prefix":"10.1038","volume":"10","author":[{"given":"So Young","family":"Kim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chanyang","family":"Min","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jay","family":"Choi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bumjung","family":"Park","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1655-9549","authenticated-orcid":false,"given":"Hyo Geun","family":"Choi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,3,6]]},"reference":[{"key":"61232_CR1","doi-asserted-by":"publisher","first-page":"287","DOI":"10.33588\/rn.4105.2004593","volume":"41","author":"JI De Diego-Sastre","year":"2005","unstructured":"De Diego-Sastre, J. 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