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.

In recent years, the level of air pollution with ozone has been above the target value in most locations, including rural areas and higher altitudes, while (due to less sunny and cooler summers) the action value has been exceeded only in the Primorska region and in some places at higher altitudes. The highest ozone concentrations have been recorded in the Primorska region due to weather patterns that are favourable for ozone formation and the transport of ozone and its precursors from northern Italy.

In Slovenia, total emissions of the pollutants that contribute to acidification and eutrophication have decreased by 78 % between 1990 and 2016. Emissions of SO_x have decreased by 97 %, NO_x by 48 % and NH₃ by 17 %. The emissions of sulphur oxides, nitrogen oxides and ammonia were in 2016 below the prescribed target values.