The Sweden’s capital upcoming low-emission zone will only permit use of electric cars and gas cars that meet the Euro 6 emission standards. Euro 6 plug-in hybrid heavy vehicles will also be permitted. The zone is in effect 24 hours a day, 7 days a week. Violating the rules of the zone is a traffic offence which can result in a police fine of SEK 1,000, i.e. roughly €85.
Air pollution in the city of Stockholm has been a long-standing problem. Medical research shows that children living near Stockholm streets with high emissions have reduced lung function from as early as six months of age.
Then it should be mentioned as well that brake dust is vastly reduced for electric vehicles at least, since the can often use regenerative braking without any friction.