The aim of this project is to improve the air in the Central Bohemian Region, namely to reduce emissions resulting from heating in local heating sites, in particular by solid fuels, which by their emissions represent a decisive source of imission loads (suspended particles PM 10, PM 2.5, benzo(a)pyrene). The target will be met by exchanging at least 5 157 stationary combustion sources into solid fuels in households in the Central Bohemian Region.