heavy trucks for their daily operations within city limits. In North Macedonia, there is one CNG station located in the capital Skopje, but it is not for public use. Only twenty buses of the local Public Transport Company have been fitted to use a mixture of diesel and CNG. The first commercial CNG station in Skopje is in the advanced stage of development and was expected to start operation in July 2011. In Serbia, there are about 20 public CNG refuelling stations as of August 2019. Four in the capital Belgrade, and the rest in the towns of Subotica (1), Novi Sad (1), Zrenjanin (1), Pancevo (2), Kruševac (1), Kragujevac (1), Cacak (2), and so on. Detailed list is currently available on CNGEurope Web site. In Slovenia, there are four public CNG refuelling stations as of December 2018. Two in the capital Ljubljana, and one each in Maribor and Jesenice. Additionally, at least 14 new refuelling stations are planned in all city municipalities by the end of 2020. Ljubljana Passenger Transport operates 66 CNG fuelled city buses, as of May 2016. Its Maribor counterpart, Marprom has 19 CNG city buses in their fleet, as of October 2018. In Croatia, there are two public CNG refuelling stations situated close to the center of Zagreb and in Rijeka. At least 60 CNG buses are in use as a form of a public transport (Zagreb public transport services). In Estonia, there are 11 public CNG refuelling stations – four in the country's capital Tallinn, and one each in Tartu, Pärnu, Viljandi, Rakvere, Jõhvi, and Narva. From 2011 on, Tartu has five Scania-manufactured CNG buses operating its inner-city routes. In Sweden, there are currently 90 CNG filling stations available to the public (as compared to about 10 LPG filling stations), primarily located in the southern and western parts of the country as well the Mälardalen region Another 70–80 CNG filling stations are under construction or in a late stage of planning (completions 2009–2010). Several of the planned filling stations are located in the northern parts of the country, which will greatly improve the infrastructure for CNG car users. There are approx. 14,500 CNG vehicles in Sweden (2007), of which approx. 13,500 are passenger cars and the remainder includes buses and trucks. In Stockholm, the public transportation company SL currently operates 50 CNG buses but have a capacity to operate 500. The Swedish government recently