The overall objective of the project is to improve ambient air quality in the municipality of Montana by reducing PM10 emissions from domestic heating as one of the main sources of air pollution. The specific objective of the project is to replace solid fuel heating appliances of households with alternative types of heating devices. The project will be implemented in two phases. During the first preparatory phase, all the actions necessary to carry out the investment will be carried out. A training campaign will be held among the population, explaining the possible alternative forms of heating and the conditions for inclusion of those who wish to join the replacement scheme. There will be a survey of attitudes among residents, who are heated with solid fuel, to replace the heating appliances they use. Environmental, economic and social analyses will be prepared, criteria and mechanisms for prioritisation of neighbourhoods/areas will be developed when applying different heating options and contributing to the reduction of PM10 emissions. On-site visits to the premises/households will examine the actual technical parameters with a view to replacing the devices. During the second investment stage, based on the results achieved in the first stage, the municipality of Montana will conduct procedures for the selection of contractors and will carry out the main investment activities for dismantling the used heating devices and for the supply and installation of the new heating appliances/systems according to the adopted parameters. The environmental benefits of the project will be expressed in a quantity of PM10 emissions saved. The socio-economic benefits of the project are related to improving the health and quality of life of residents of the municipality of Montana and increased public awareness of air quality issues.