A display assembly which detects abnormal operating conditions, such as gas recirculation or airway occlusion, is provided. An electronic display is located within a housing. An airflow pathway travels through the housing and is configured to accept, circulate, and exhaust air by way of one or more fans. One or more sensors measure characteristics of the air. Weather conditions for a location of the display assembly are gathered, measurements from the sensors are received, and a determination is made as to whether the measurements of the ingested air are within a margin of error expected measurements derived from the gathered weather conditions. An alert is generated if the measurements of the ingested air are not within the margin of error.