Gaseous Air Quality Indicators along Traffic Routes in Greater Freetown, Sierra Leone. International Journal of Geography and Geology, [S. l.], v. 6, n. 2, p. 32–39, 2016. DOI: 10.18488/journal.10/2017.6.2/10.2.32.39. Disponível em: https://archive.conscientiabeam.com/index.php/10/article/view/1975. Acesso em: 22 sep. 2026.