We have developed a portable technology that can measure the size  and  number of  droplets  in a living/working  environment. The  number  of   droplets  in  the  air  is  used  as  an  indicator  of  the potential for virus transfer. The  device  samples  the  air  in  an  environment  to  determine  the  air quality. It differentiates droplets and specific types of pollens and spores from other particles.  The device is portable, affordable, and provides instant results. Our device  uses  direct  imaging  of  the airflow using a camera. Therefore, we can directly see if there are any droplets or other particles. Droplets  are  always  spherical  in  shape,  whereas  other  particles  are  not.  We  use  high-quality resolution microscopic imaging to identify microscopic droplet sizes. It has imaging  software  that automatically adjusts the camera setting for sharpness and contract, as well as flashlight  duration and intensity for different environments for optimum droplet images.
It has a simple user interface to interpret environmental  data.  The  device  works  in  the  following manner:

Air is taken into the device through an intake channel. A fan inside the device  generates  a  suction to take the  outside  air  into  the  system.  The  air  is  guided   through  a  channel  for  microscopic observation.
The channel is equipped with a camera and a  flashlight  to  take  short-duration  snapshots  of  the airflow. The flash duration is in the order of microseconds to freeze the motion of any droplets  that may be inside of the flow. The images taken by the camera  are  then  processed  to  determine  the size and number of the droplets in the airflow. The size of the droplets would indicate whether  they are from another person. The number of the droplets will indicate the quality of the  air.  The  higher the number of droplets, the lower the air quality. The shade of the droplets would  indicate  whether the droplets are pure water or contain any contamination.