The City has reduced greenhouse gas emissions per capita from 5.3 tonnes in 1990 to 3,4 tonnes in 2009 and are further aiming towards 3 tonnes by 2015 and zero emissions by 2050.
Traffic is today the major source of both green house gas emissions and health hazardous emissions. Stockholm works intensely to decrease these emissions. The public transport has increased its share and on average 64 % of the trips to Stockholm city centre is made by metro, trams, commuter trains or buses, while almost 10 % go by bike. In the morning peak hour, the share for public transport is as high as 78 %. In the inner city 68 percent is done by feet and by bike, 25 percent by public transport, whereas by car only 8 percent.
In 2006, Stockholm introduced the Congestion tax, which immediately reduced the number of trips with 20% and the emissions with 10-15 %. These figures remains the same, also when the total number of registered cars has increased by 6 % in the region
Stockholm is one of the world leading cities in introducing clean vehicles. By 2008, these vehicles amounted to 40% of the sales and almost 10 % of the total fleet, or over 90,000 vehicles are today clean. There are 170 fuelling stations offering ethanol E85 and 13 offering biogas
In 2009, there were 6,811 registered electric vehicles in Stockholm County. The vast majority of these were hybrid electric vehicles (i.e. Toyota Prius). 75 new outdoor public parking places are equipped with slow charging and 40 older indoor parking places in public garages equipped with slow charging. Also two older fast charging units established in the late 1990s are still available. The plan is to equip another 125 outdoor public parking places with slow charging during 2010.
Following the successes with bioethanol and biogas vehicles, Stockholm will initiate a market development for electrical and Plug-in hybrid-electrical vehicles, with the intermediate target to reach a market share of 10% by 2010.