Concentrations of sulphur dioxide in ambient air are no longer harmful for human health. Also, the critical annual value for the protection of vegetation is no longer exceeded. The improvement of the situation in the last decade is a result of the use of low-sulphur fuels in industry and the operation of desulphurisation facilities in thermal power plants.

Higher levels of heavy metals and nitrogen are observed around the urbanized areas, industrial regions and around thermal power plants. The reason for elevated levels at the western part of Slovenia is transboundary transport of air pollutants from the Po Valley in Italy, however at the eastern part might be transit traffic and agricultural activity. A decrease of heavy metals and nitrogen in mosses is observed in Slovenia since 1995.

According to the size indicator of energy intensity of final energy consumption Slovenia is in significantly worse place than the average of EU-27. In the last three years, the energy intensity of final energy consumption increased. The only sector by reducing energy intensity in the last three years are households.

In the 1990-2015 period, the quantity of spent nuclear fuel, which is the only type of high-level waste in Slovenia, increased by 5 % annually. As there is still no satisfactory method of waste storage, the accumulation of this waste poses a reason for concern. 

In Slovenia, final users have at their disposal only around 73% of primary energy. In 2015 the rate reached its highest level. The efficiency of electricity and heat production is largely influenced by this share in far.