Air quality evolution in South Africa over the past 20 years: A journey from a consultant’s viewpoint. Clean Air Journal, [S. l.], v. 34, n. 2, 2024. DOI: 10.17159/caj/2024/34/2.20555. Disponível em: https://cleanairjournal.org.za/article/view/20555. Acesso em: 5 jan. 2025.