Smog episodes in the Lodz agglomeration in the years 2014-17 Grzegorz Wielgosiński, Justyna Czerwińska, Olga Namiecińska and Robert Cichowicz E3S Web of Conferences, 28 (2018) 01039 Published online: 10 January 2018 DOI: 10.1051/e3sconf/20182801039