Analysis of PM10 high concentration episodes in Warsaw, Krakow and Wroclaw in the years 2005–2017 with application of selected elements of information systemsDominik Kobus, Alicja Nych and Izabela SówkaE3S Web Conf., 44 (2018) 00070DOI: https://doi.org/10.1051/e3sconf/20184400070