Air pollution is the greatest environmental risk to health and a major cause of disease and premature deaths in Europe. Pollution due to PM_2.5 causes respiratory, cardiovascular, neurological and metabolic diseases. Since 2005, the number of premature deaths due to PM_2.5 pollution has been decreasing in Slovenia and in EU countries. In 2019, there were 1,409 premature deaths due to PM_2.5 pollution in Slovenia, and 307,000 in the European Union.

In the last decades, major emissions of air pollutants from transport decreased. However, road transport remains one of the most significant sources of air pollution. In Slovenia in 2020 road transport contributed 38 % to the total emissions of nitrogen oxides. In the period 1990-2020 emissions of substances that cause acidification and emissions of ozone precursors in transport sector declined by 74 % and 77 %. In the period 2000-2020 emissions of particulate matter decreased by 56 %.

In 2021, drinking water monitoring was carried out in supply zones (water supply systems) that supply 50 or more persons (94,6% of the population). Large, medium and some of small supply zones that supply more than 500 (90,0%) inhabitants, generally have adequate drinking water quality. The smallest supply zones that supply 50-500 inhabitants are the least regulated, in comparison to larger due to the fecal contamination, as some with karst water resources.

In Slovenia, in 2021, drinking water monitoring (quality monitoring) was carried out for 94,6% of the population, at the point of use (user's tap) on drinking water supply systems, or in 873 supply zones that supplied 50 or more inhabitants and included 23 smaller supply areas, which also supplied public facilities, facilities for the production and distribution of foodstuffs. In the drinking water monitoring did not include 5,4% of the population of Slovenia, which supplies fewer than 50 persons e.g. individual supply providing, rainwater.

The Green Key is an international label for the environment, which is awarded to tourist accommodations and catering establishments that strive for environmental responsibility and sustainable behavior in the tourism industry. In Slovenia, 143 siteswere certified in 2022. In 2021, 3,165 sites were certified in the European Union, and 3,165 around the world.