DR. SUGANDHA CHHIBBER. IMPACT OF COVID-19 ON AIR QUALITY: EVIDENCE FROM THE TEN MAJOR CITIES WORLD WIDE. International Journal on Economics, Finance and Sustainable Development, [S. l.], v. 2, n. 3, p. 9–20, 2020. DOI: 10.31149/ijefsd.v2i3.402. Disponível em: https://journals.researchparks.org/index.php/IJEFSD/article/view/402. Acesso em: 3 nov. 2026.