Hazy skies descend over the New York City area again on Tuesday, re-upping some air quality alerts related to Canadian wildfire smoke. As of 9 a.m., the air quality index was 118, which is considered unhealthy for sensitive groups.

Canadian wildfires are the cause of an air quality alert that’s in effect for the tri-state area, according to health officials. New York City’s air quality index is at 118 on Tuesday, AirNow’s tracker indicates.

The New York State Department of Environmental Conservation has issued an Air Quality Health Advisory for the Lower Hudson Valley, New York City and Long Island, until midnight Tuesday, Aug. 5. NYSDEC said ground level ozone and particulate matter in the air due to wildfires in Ontario could exceed safe air quality index levels over 100.