Dr. Howard Smith Oncall

  Vidcast:  https://youtu.be/flxjj9dc1Pc   Riding with windows open WHILE wearing a mask is the wining formula for protecting yourself from CoVid.  Britain’s Global Centre for Clean Air Research studied in-car air quality with multiple sensors and estimated your probability of  CoVid transmission from another, infected passenger.  They tested various conditions including everyone masked or maskless, windows closed or open, the ventilation system bringing in fresh outside air or recirculating the air, speaking levels varying from loud to normal to only breathing, and various trip durations.   Transmission of infection rises as speech volume levels escalate.  Infection transmission diminishes when passengers wear a typical non-medical 3 layer cloth mask  as airflow through the vehicle increases by opening the windows or, second best, bringing in fresh air while air conditioning.     With 50%.        Loud speaking        Normal Speaking.         Only breathing       eff. Mask WC-RC                 28.5%/hr.