The potential applicability of newly synthesized B36 nanosheet as a chemical sensor for formaldehyde (HCHO), acetaldehyde (CH3CHO) or propanal (CH3CH2CHO) pollutants detection is investigated by employing DFT calculations. The results indicate that although these pollutant molecules weakly interact with concave or convex sides of nanosheet, it remarkably adsorbed at the edge of B36 nanosheet. Indeed, the adsorption of one to six pollutant molecules at the edge of B36 nanosheet is considered to investigate adsorption capacity. The results reveal that the adsorption energies and electronic properties are affected by the number of adsorbed pollutant molecules. The B36 nanosheet is introduced as a chemical sensor for HCOH, CH3CHO or CH3CH2CHO detection due to producing an electrical signal which is sensitive to their concentration.