New York City’s air quality is improving, but it’s still classified as ‘unhealthy,’ according to data from the Environmental Protection Agency. That’s thanks to Canadian wildfires that have brought dangerous smoke to the New York metro area. Based on the persistence of the dangerous air pollutants, New York City and state officials on Thursday extended the city’s air quality advisory to Friday evening. WNYC's Health and Science editor Nsikan Akpan spoke with All Things Considered host Sean Carlson about the latest developments.