Yousufzai, A H K, Durdana Rais Hashmi, and Kamran Durrani. 2000. “?MEASUREMENT OF SULPHUR DIOXIDE AND PMIO AT KORANGI INDUSTRIAL AREA AND PHOTOCHEMICAL OXIDANTS AT UPTOWN AREA OF KARAcm”. Biological Sciences - PJSIR 43 (6):341-46. https://v2.pjsir.org/index.php/biological-sciences/article/view/2065.