加拿大野火肆虐 烟尘污染扩散至美国

Core Viewpoint - Recent wildfires in Canada are causing smoke and air pollution to spread into the United States, particularly affecting air quality in several states [1] Group 1: Environmental Impact - The wildfires have led to a deterioration of air quality in the U.S., with specific areas like Arohead, Minnesota, experiencing "orange" air quality levels [1] - "Orange" air quality levels pose significant health risks to sensitive groups, including individuals with chronic illnesses, the elderly, and children, who are advised to limit outdoor activities [1]