TERBLANCHE, P; UYS, L; NEL, R. Development and application of ambient air quality standards. Clean Air Journal, [S. l.], v. 8, n. 4, 1991. DOI: 10.17159/caj/1991/8/4.7308. Disponível em: https://cleanairjournal.org.za/article/view/7308. Acesso em: 9 may. 2024.