The affected regions are Värmland, Örebro, Gotland, Västernorrland, Jämtland and Västerbotten, with the travel warning set to be removed at midnight on Friday. It follows a recommendation from the Norwegian Institute of Public Health earlier this week.
“I am happy about the positive development in several regions in Sweden,” Norwegian Health Minister Bent Høie said at a press conference on Wednesday.
Together with Norrbotten and Södermanland, which were already on Norway's 'yellow list', that makes eight of Sweden's 21 regions. 'Yellow areas', previously classes as 'green', do not require quarantine on arrival, but the government changed the colour to emphasise the recommendation against travel in general.
The decision is based on an overall assessment of the infection rate and situation in the country. Two of the criteria are fewer than 20 confirmed cases per 100 000 inhabitants during the last two weeks, and fewer than five percent positive tests on average per week over the last two weeks.
Travellers from other parts of Sweden must quarantine for ten days on arrival in Norway, though exceptions can be made for work-related travel, while Norwegians are not allowed to travel to these areas for tourism purposes.