Slovenia belongs in the group of EU countries, which are more polluted due to particulate matter (PM₁₀). The average annual concentration of PM₁₀ is exceeding the limit value recommended for the protection of human health by the World Health Organization (20 µg PM₁₀/m³). Very young children, including unborn babies and elderlies, are particularly sensitive to air pollutants like PM.

In Slovenia in 2017, 94% of the population was supplied with drinking water from water supply systems that had undergone water quality monitoring in situ, at users’ taps. Drinking water monitoring excluded 6% of the Slovenian population. Generally, all residents of Slovenian cities are supplied with drinking water subjected to regular monitoring. Accessibility of drinking water did not improve significantly in the period 2004–2017.

According to the state of epiphytic lichens, the preservation of forests and air quality is poor in the entire territory of the Republic of Slovenia, except in forests at higher altitude in the Alps and partially in the Dinaric mountain range.

Acidification of forests represents a potential danger only in the non-hydrocarbon part of Slovenia, especially in the east of the country. According to rough estimates, the critical loads occur particularly in the wider area of both major thermals (Zasavje, Celjska kotlina and Šaleška dolina). Excessive eutrophication of forests for deposition from the air does not take looming forest areas in Slovenia.