U.S. media announced that the American capital Washington has made it onto the list of the most polluted cities on Earth as of last night, Monday, due to the thick smoke sweeping through the Appalachian Mountains towards the eastern coast and the renewal of the massive smoke caused by wildfires in Canada reaching the United States, which resulted in air quality warnings. The armed forces and the Canadian Coast Guard are heading to British Columbia in the west after the Ottawa government approved the province's request for federal assistance. Canadian provinces submit official requests for federal help when an emergency overwhelms them or poses a threat, according to the government. They added that British Columbia is currently experiencing a difficult season of wildfires. American newspapers noted that smoke from wildfires can travel vast distances as the particles are small enough to reach the bloodstream through the lungs if inhaled. The deployment of resources and military forces comes at a time when Canada is suffering from increasingly frequent wildfires due to climate change, and the smoke turned the sky in some areas to an orange hue along the eastern coast last month, prompting local health authorities to issue warnings regarding air quality and urging people, especially the most vulnerable groups, to stay indoors. Since last Sunday, atmospheric currents have carried another massive plume of smoke from Canada to the United States, and the sky was expected to turn orange in parts of 23 U.S. states until Tuesday. Major cities have already reached this level as of last night, including Chicago, Nashville, and Baltimore, according to Air Now. The bad air and haze extended from Alabama to Georgia and New England and westward into the Great Lakes region, while smoke continued to rise in parts of Montana to the Central Great Plains.