Two members of our group have attended the IV International Conference Oxygenalia 2018 in Vilnius (11-13 October 2018) where prof. Wojciech Macyk has given a lecture entitled „Metal oxides in photocatalysis – opportunities and limitations” and Magdalena Mikrut presented poster “Particulate matter from Kraków versus standardized air pollution: physicochemical analysis, HO˙ and singlet oxygen photo-generation”.