Nurfadillah, A. R., Hutuba, A. and Djafar, S. M. . (2023) “Nitrogen dioxide (NO2) levels and health problems in street sellers around Universitas Negeri Gorontalo (UNG)”, Gema Wiralodra, 14(3), pp. 1439–1446. doi: 10.31943/gw.v14i3.550.