Nearly all of Maryland is under a Code Red alert for unhealthy air quality Wednesday as smoke from wildfires in Canada has blanketed the air. Conditions are expected to remain hazardous on Thursday, the National Weather Service said.

Poor air quality will continue through Friday, along with reduced visibility due to the wildfire smoke, the agency said.

Anne Arundel County Public Schools canceled all outdoor activities Wednesday because of the poor air quality alert.

Maryland counties under the Code Red alert include: Baltimore, Anne Arundel, Frederick, Carroll, Harford, Cecil, Kent and Queen Anne's, plus the city of Baltimore. Parts of Howard and Montgomery counties are also included.... Read More: Pikesville Patch