Air Quality September 23, 2021 11:15 pm Air Quality Alert for LA County Smoke from central California wildfires affected the air quality in areas of Los Angeles County. Robert Kovacik reports for NBC4 News at 11 p.m. on Sept. 23, 2021. US & World Videos 0:50 Arson ruled out as cause of Oceanside Pier fire 2:57 Pro-Palestinian vigil and march for Gaza in Pasadena 1:57 Pedestrian killed in multi-vehicle crash in Hollywood 7:28 Tensions rise as UCLA protest continues 2:42 Executive staff to LA County DA accused of mishandling confidential police files
