The Air Quality Sector, as part of the organizational structure the Croatian Meteorological and Hydrological Service, works to prevent and mitigate pollutants that are transmitted and deposited locally, regionally, and remotely of pollutants that negatively affect human health and the environment. As such, it ensures the achievement of the strategic goals of the European Union and the Republic of Croatia in the area of air pollution. For this purpose, it works as a coordinator from cooperation with the local community of the Republic of Croatia to cooperation with the leadership of the European Union following the results of measurements, reports, studies, or necessary action plans for individual areas. European Union policy has a clear goal of reducing individual sources and national sources of emissions for key pollutants in the atmosphere (sulfur dioxide (SO2) by 79%, ammonia (NH3) by 19%, non-methane volatile organic compounds (NMVOC) by 40%, nitrogen oxides (NOx) for 63% and floating particles with a diameter of less than 2.5 microns (PM2.5) for 49%). The paper shows the achievement of the goals for reducing emission sources in the territory of the Republic of Croatia. This work are carried out by the Air Quality Sector as part of the organizational structure of Croatian Meteorological and Hydrological Service. The results are presented through the analysis of measured data, emissions and analysis of modeled concentrations of key pollutants. The purpose of the strategy is to reduce harmful effects through cooperation and coordinated action at the local, national and international level as well as through the cooperation of different policies, both climate and economic.