Data on air pollution shows that Slovenian cities are over-polluted with NO₂ and PM₁₀. Transport is one of the main causes of this pollution. Air quality in Slovenian cities improved during the economic recession after 2008, and after 2016 the NO₂ pollution became worse again.

Sustainable mobility planning at regional and local level has been rapidly gaining ground in the last decade. After joining the EU, this integrated approach to transport planning began to be implemented in Slovenia as well, and in the last decade the development of this area has experienced rapid progress. Nowadays, more and more municipalities respond to the incentives of the EU and of the Ministry of Infrastructure and are preparing and implementing Sustainable Urban Mobility Plans (SUMP), which are the central tool of the Sustainable urban mobility planning.

Nutrients, especially nitrogen and phosphorus compounds, are important for the growth of algae and higher plants, but in high concentrations can cause undesirable changes in aquatic organisms and seawater quality. Long-term measurements of selected nutrients in the Slovenian sea show that their concentrations have decreased significantly. Therefore, the ecological status of the Slovenian Sea is assessed as good to very good based on nutrients in recent years.

The number of inhabitants who live in the impact area of major roads and railways in Ljubljana and are exposed to high noise levels did not change significantly between 2012 and 2017, and is not decreasing in accordance with the set objectives.

The number of inhabitants who live in the impact area of major roads outside urban areas has decreased. In 2017, around 16,000 fewer inhabitants were exposed to high noise levels throughout the day and during the night compared to 2012. In urban areas, the number of inhabitants who are exposed to road traffic noise has not decreased. The number of inhabitants who are exposed to high noise levels throughout the day has remained at the same level as in 2012 and is estimated at 64,000.