UPDATE: The fire is off and the north route is safe again.
Emergency Notification from Qeqqata Municipality:
Due to the strong smoke from fire at the bottom of the 1st fjord, northeast of Sisimiut, we advise against using part of the route between Sisimiut and Kangerlussuaq, the Arctic Circle Trail, between Kangerluarsuk Tulleq (1. Fjord) and Eqalugaarniarfik (Oles Lakseelv).
We recommend using alternative route between Kangerluarsuk Tulleq and Eqalugaarniarfik through Sarfannguit. The route is marked with cairns, which you should be aware of.