Nurfadillah AR, Hutuba A, Djafar SM. Nitrogen dioxide (NO2) levels and health problems in street sellers around Universitas Negeri Gorontalo (UNG). gw [Internet]. 2023 Oct. 31 [cited 2025 Apr. 24];14(3):1439-46. Available from: https://gemawiralodra.unwir.ac.id/index.php/gemawiralodra/article/view/550