Nurfadillah, Ayu Rofia, Ariani Hutuba, and Siti Melisawati Djafar. 2023. “Nitrogen Dioxide (NO2) Levels and Health Problems in Street Sellers Around Universitas Negeri Gorontalo (UNG)”. Gema Wiralodra 14 (3):1439-46. https://doi.org/10.31943/gw.v14i3.550.