CONTEMPORARY CHALLENGES IN AIR QUALITY MANAGEMENT AND MONITORING IN ENVIRONMENTALLY VULNERABLE CITIES: A CASE STUDY BASED ON YEREVAN DATA. Proceedings of the YSU C: Geological and Geographical Sciences, Yerevan, Armenia, n. Special Issue N1 (270), p. 15, 2026. DOI: 10.46991/PYSUC.2026.SI1.015. Disponível em: https://journals.ysu.am/proceedings-geol-geogr/article/view/vol60_2026_SI1_015. Acesso em: 20 sep. 2026.