A mechanical ventilation system includes at least one processor in communication with a display device and at least one sensor configured to measure an aspect of the air carried by the ventilation system. The at least one processor is configured to receive and process data received from the at least one sensor. The processor is configured to generate and display on the display device a first graph of a measured aspect of the air corresponding to a first time period and a second graph of a measured aspect of the air corresponding to a second time period subsequent to the first time period. The at least one processor is configured to display the second graph superimposed over the first graph.
