In Slovenia, emissions of persistent organic pollutants (polychlorinated biphenyl, polycyclic aromatic hydrocarbons, hexachlorobenzene, dioxins and furans) decreased between 1990-2023, primarily due to targeted legislation, improved control and use of best available technologies.

Emissions of primary particles smaller than 10 µm (PM10), particles smaller than 2.5 µm (PM2.5), and all total suspended particles (TSP) decreased in Slovenia in the period 2000–2023 by 26 %, 36 %, and 11 %, respectively. The main source of particulate matter emissions are households, mainly due to the use of biomass for domestic heating.

Heavy metal emissions in Slovenia significantly decreased between 1990 and 2023. This can be largely attributed to the implementation of the EU legislation, improved surveillance and use of the best available technologies.

In the last decades, emissions of air pollutants from transport decreased. However, road transport remains one of the most significant sources of air pollution. In Slovenia in 2023 road transport contributed 40 % to the total emissions of nitrogen oxides. In the period 1990-2023 emissions of substances that cause acidification and emissions of ozone precursors in transport sector declined by 71 % and 76 %. In the period 2000-2023 emissions of particulate matter decreased by 51 %.

In Slovenia, slightly more than 106,000 tonnes of municipal waste were landfilled at 10 non-hazardous waste landfills in 2023, compared to slightly more than 90,000 tonnes the year before. The increase in landfilled municipal waste in 2023 was the result of the extensive floods that hit Slovenia during the summer of that year.

The share of landfilled municipal waste at the EU level in 2023 was 22% of generated municipal waste. The countries in which more than half of generated municipal waste was landfilled include Greece, Romania, Malta, Cyprus, Portugal, Hungary, and Bulgaria.