WERNECKE, B. Clean Air Journal celebrated this year’s International Day of Clean Air for Blue Skies. Clean Air Journal, [S. l.], v. 31, n. 2, 2021. DOI: 10.17159/caj/2020/31/2.12811. Disponível em: https://cleanairjournal.org.za/article/view/12811. Acesso em: 2 oct. 2022.