Smoke from Canadian wildfires has prompted multiple air quality alerts across the Northeastern United States, affecting states like New York, Massachusetts, and Maine. Areas such as Long Island, Boston, and the Tri-State Region are experiencing unhealthy air quality levels, leading to health advisories for millions. Residents are urged to monitor their health, especially those experiencing chest discomfort or unusual fatigue. The situation has resulted in significant haze and has raised health concerns, with alerts expected to remain in place through the weekend before rain is anticipated.