Putri Shazlia Rosman, Mohd Armi Abu Samah, Kamaruzzaman Yunus, Mohd Ramzi Mohd Hussain, Mohd Zikri Azmi. 2020. “Quality Air Monitoring Equipment: The Review Of Air Quality Monitoring Equipment”. International Journal of Advanced Science and Technology 29 (9s), 1826 -35. http://sersc.org/journals/index.php/IJAST/article/view/13952.