There are currently delays at Arlanda and Bromma airports due to fog. 

– This mainly applies to Bromma and the forecast says that the fog will clear up during the morning. But those travelers who are not leaving at all and whose flights are canceled will have to contact the airlines, says Frida Yones, press spokesperson at Swedavia. 

This can include both cancelled flights and delays.

There are also expected to be subsequent delays during the day.

Source: Aftonbladet.se