Diffusion denuders are LVS with flow rates from 6 to 17 l min−1 and sampling duration between 2 and 48 h.This sampling technique have been applied to determine concentrations in the atmosphere or investigate gas-particle partitioning of different SOVC such as polycyclic aromatic hydrocarbons (PAHs) [69,73,74], polychlorinated biphenyls (PCBs) [70], OCPs [66] or carbonyl compounds [67,75]. To our knowledge, denuders have not been applied for the determination of CUPs in ambient air.