WASHINGTON — President Joe Biden on Thursday assured Americans the government was aiding Canada in fighting the wildfires that have cloaked the East Coast and Midwest in unhealthy levels of smoke and haze. “Since May, more than 600 U.S. firefighters, support personnel, and firefighting assets have been deployed, working alongside Canadian firefighters to tackle what is likely to be the worst fire season in Canadian history, and one that has huge impacts here in the United States,” Biden said in a statement. The president spoke with Canadian Prime Minister Justin Trudeau on Wednesday and offered additional assistance to beat back the fires, particularly in Quebec, where 150 fires are burning. The president said he directed the National Interagency Fire Center to help as well. In a statement, Trudeau thanked Biden for the aid, adding that the countries must “work together to address the devastating impacts of climate change.”