Air pollutants are really a hazardous problem in Bangladesh. This paper works on the relationship between the pollutants and the admittance of patients in the medical facilities and analyzes the reason behind the increase of the disease rate in the hospitals. The research collected medical data from the medical center named National Institute of Disease of the Chest and Hospital (NIDCH) that is located in Dhaka, Bangladesh and the air pollutants data of the city of Dhaka. This paper uses k-means clustering method for clustering different air pollutants in different seasons of Bangladesh. CART method is also used to classify the patients according to different rate of admission. The missing values of data were replaced by probabilistic mean median method.