"Canadian Wildfires Blanket NYC and Midwest in Unhealthy Smoke, Millions Affected"

New York City's air quality reached "unhealthy" levels as smoke from Canadian wildfires settled over the city, making it the second-worst air quality in the world. The concentration of smoke poses a risk to public health, and officials have issued a health advisory. The Air Quality Index (AQI) rose to over 160, prompting warnings for young people, older adults, and those with underlying health conditions to avoid outdoor activities. While the smoke is expected to gradually ease over the holiday weekend, the possibility of canceling July 4th fireworks is being considered. The impacts of climate change make future smoke events likely, and N95-style masks are being distributed for free in various locations across the city.