{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T16:58:03Z","timestamp":1785430683593,"version":"3.56.0"},"reference-count":24,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T00:00:00Z","timestamp":1785196800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100018862","name":"Finnish ORL-HNS Foundation","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100018862","id-type":"DOI","asserted-by":"crossref"}]},{"id":[{"id":"https:\/\/ror.org\/02c59qd48","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003128","name":"Finnish Work Environment Fund","doi-asserted-by":"crossref","award":["180134"],"award-info":[{"award-number":["180134"]}],"id":[{"id":"10.13039\/501100003128","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100003128","name":"Finnish Work Environment Fund","doi-asserted-by":"crossref","award":["117439"],"award-info":[{"award-number":["117439"]}],"id":[{"id":"10.13039\/501100003128","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100003128","name":"Finnish Work Environment Fund","doi-asserted-by":"crossref","award":["210403"],"award-info":[{"award-number":["210403"]}],"id":[{"id":"10.13039\/501100003128","id-type":"DOI","asserted-by":"crossref"}]},{"award":["180134"],"award-info":[{"award-number":["180134"]}],"id":[{"id":"https:\/\/ror.org\/02v046k89","id-type":"ROR","asserted-by":"publisher"}]},{"award":["117439"],"award-info":[{"award-number":["117439"]}],"id":[{"id":"https:\/\/ror.org\/02v046k89","id-type":"ROR","asserted-by":"publisher"}]},{"award":["210403"],"award-info":[{"award-number":["210403"]}],"id":[{"id":"https:\/\/ror.org\/02v046k89","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Juho Vainio Foundation"},{"id":[{"id":"https:\/\/ror.org\/05jf66d94","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Environ. Res. Public Health","IJERPH"],"abstract":"<jats:p>This study examined associations between perceived indoor air quality (PIAQ) and self-reported voice symptoms in teachers, with exploratory observations on man-made mineral fibers (MMMF). Forty-seven teachers underwent within-day assessments at the beginning (good PIAQ) and end (poor PIAQ) of a workday. Clinical voice status was evaluated with laryngoscopy and the Grade\u2013Roughness\u2013Breathiness\u2013Strain (GRBS) scale. Self-reported symptoms were measured with a 100 mm Visual Analog Scale (VAS) and the 30-item Voice Handicap Index (VHI). Classroom settled dust was collected on gelatin tape and analyzed by light microscopy for MMMF. No significant within-day clinical voice changes were detected, although breathiness showed a non-significant increase. Median VAS scores for voice symptoms showed no meaningful within-day change. Poorer afternoon PIAQ was associated with higher post-VAS, and longer daily exposure time co-varied with greater subjective worsening. Teachers with high VHI scores more often reported symptom worsening and poorer PIAQ ratings. Self-reported voice symptoms correlated positively with poor PIAQ and exposure duration. These findings suggest a symptom-driven pattern without evidence of environmental causality. Longitudinal studies with real-time IAQ monitoring are needed. Occupational health follow-up is recommended for teachers with persistent voice problems, with attention to vocal load.<\/jats:p>","DOI":"10.3390\/ijerph23080973","type":"journal-article","created":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T08:52:01Z","timestamp":1785228721000},"page":"973","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Voice Changes Related to Perceived Indoor Air Quality in Finnish Teachers: A Proof-of-Concept Field Study"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9759-8840","authenticated-orcid":false,"given":"Hanna","family":"Vertanen-Greis","sequence":"first","affiliation":[{"name":"Faculty of Arts, Psychology and Theology, Speech and Language Pathology, \u00c5bo Akademi University, 20500 Turku, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sirkku","family":"H\u00e4kkil\u00e4","sequence":"additional","affiliation":[{"name":"Aerobiology Laboratory, The Department of Biodiversity Sciences of the University of Turku, 20500 Turku, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eliisa","family":"L\u00f6yttyniemi","sequence":"additional","affiliation":[{"name":"Department of Biostatistics, University of Turku and Turku University Hospital, 20500 Turku, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juha","family":"Vintturi","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology and Phoniatrics\u2013Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anthony","family":"Maalouf","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology and Phoniatrics\u2013Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1617-1181","authenticated-orcid":false,"given":"Ahmed","family":"Geneid","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology and Phoniatrics\u2013Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, 00290 Helsinki, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1016\/j.jcomdis.2013.01.001","article-title":"Voice disorders in teachers and their associations with work-related factors: A systematic review","volume":"46","author":"Vogel","year":"2013","journal-title":"J. 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