One of the main sources of greenhouse gas emissions in Slovenia is road traffic, as passenger vehicles contribute as much as 20 % of all greenhouse gas emissions. It is estimated that, due to the smaller role of public passenger transport in Slovenia, it is necessary to achieve as much as 2/3 reduction of GHG emissions by electrifying the vehicle fleet, which dictates the replacement of existing vehicles with fossil fuels. with electric vehicles (battery and plug-in hybrids EV).

In the period 2002-2021, the highest exposure to ozone concentrations were detected in the Primorska region in summer where air quality measuring stations in Koper and Nova Gorica detected highest ozone concentrations in ambient air. There are some differences from year to year in a level of ozone exposure due to meteorological conditions in the warm half of the year and other regional characteristics. 

Since 2017, as a result of the introduction of the fuel price supplement due to the mixing of biofuels, use of biofuels has increased. In 2020, 10.9% RES share in the transport sector has been achieved. Biofuels contributed 94 % to this share, with some biofuels multiplied by multiplier factors in the calculation of the RES share. Biofuels accounted for less than 6% in 2020 in transport energy use, with one sixth of advanced biofuels.

One of the main reasons of mortality due to respiratory diseases is in Slovenia chronic pulmonary disease (COPD). The highest mortality rate due to respiratory diseases in Slovenia is in Savinjska and Zasavska region and the lowest in Central-Slovenian region (2017–2021). Mortality due to respiratory diseases is decreasing; in the period 2017 to 2021 it decreased from 62/100.000 inhabitants to 32/100.000 inhabitants. This can be attributed to the “harvesting effect” of COVID 19.

Energy use contributes 79% to total greenhouse gas emissions in Slovenia. The biggest sources of emissions are electricity and heat production and transport. With the introduction of the EU Greenhouse Gas Emissions Trading Scheme (EU-ETS) Member States targets for GHG's covered only emissions from nonETS sources. Transport is by far the largest source of on nonETS emissions in Slovenia with 47%, while  emissions from energy use contribute 73%. The 2020 target has been achieved. Target for the following years are significantly more ambitious.