“…Overall, among the retrieved studies exposure characterisation varied widely, particularly in terms of the exposure of interest and exposure assessment methodology. In total, 14 studies examined indoor exposure to bioaerosols [ 36 , 37 , 38 , 39 , 41 , 43 , 44 , 46 , 47 , 48 , 54 , 55 , 56 , 58 ], eight to air chemicals [ 40 , 42 , 45 , 49 , 51 , 52 , 53 , 57 ] and two assessed both bio-aerosols and specific chemicals [ 50 , 59 ]. In terms of the exposure to bioaerosols, 11 studies investigated exposure to endotoxin [ 37 , 38 , 39 , 41 , 43 , 44 , 47 , 48 , 50 , 56 , 59 ], three articles exposure to dust mites [ 36 , 46 , 59 ], three to fungi flora [ 50 , 54 , 55 ], three to glycans [ 38 , 43 , 44 ], two to EPS-Pen/Asp [ 38 , 47 ], two to LPS [ 50 , 54 ], one to pet allergens [ 36 ], one to fun...…”