@nbcnewyork: Amid air quality concerns due to smoke from Canadian wildfires (along with heat and humidity levels), NYC is handing out free KN-95 masks at NYPD precincts and public library branches throughout the five boroughs. There are also masks available at nine firehouses across the city. The air quality index for midtown Manhattan on Wednesday topped 150, putting it in the "unhealthy" range. Many people reported eye irritation and the smell of smoke in the air. The diminished air quality, in addition to the ongoing heat advisory, makes being outside unadvisable. High levels of fine particulate matter in the air from wildfire smoke can cause shortness of breath, coughing, dizziness or fatigue and aggravate heart and lung diseases and other chronic health issues. #nbc4ny #nyc #health