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.

In 2023, agriculture accounted for 97.4% of total ammonia emissions. From 1990 to 2024, ammonia emissions in Slovenian agriculture decreased by 31.0% and by 15.7% since 2005. Slovenian agriculture is achieving the overall emissions target set out in the NEC Directive (a gradual reduction of at least 15% by 2030 compared to 2005).

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 %.