Adiabatic and radiative cooling are both important causes of aerosol activation in simulated fog events in Europe. - Ghosh, Pratapaditya; Boutle, Ian; Field, Paul; Hill, Adrian; Mazoyer, Marie; Evans, Katherine J.; Mahajan, Salil; Kang, Hyun-Gyu; Xu, Min; Zhang, Wei; Gordon, Hamish (Atmospheric Chemistry & Physics, 2025)