Weather tracker: Canada wildfires rage in what could be worst season to date

Plumes of smoke move southwards across US east coast. Elsewhere, Japan hit by remnants of Typhoon Mawar

Wildfires in Quebec, Canada, continue to rage, following a spring that was drier and warmer than normal, creating perfect conditions for wildfires to develop. As of 7 June, at least 150 fires remained active across the province, with more than 400 across the country according to the Canadian Interagency Forest Fire Centre. Officials warned this could be the country's worst wildfire season to date, with at least 9.4m acres of land destroyed so far.

Plumes of smoke from the fires have been moving southwards across the US east coast, delaying thousands of flights. The US National Weather Service also issued air quality alerts for many states, with air quality index levels above 400 - a level of 300 is considered hazardous" - in some states. A fairly static weather pattern this weekend will mean further plumes of smoke moving towards eastern parts of the US.