Assessment of the Particle Filtration Efficiency of N95 Masks Protecting Quarry Workers in Erongo, Otjozondjupa, and Kunene Regions of Namibia: DOI: https://dx.doi.org/10.4314/ajhs.v38i1.5. African Journal of Health Sciences, [S. l.], v. 38, n. 1, 2025. Disponível em: https://ojs.ajhsjournal.or.ke/index.php/home/article/view/637.. Acesso em: 12 nov. 2025.