This is from another Doctor Willie Ong on You Tube. He explains the risk of Corona Virus and when you are out with a lot of distance from others, you are at your safest even without a mask. The Corona Virus dissipates fast on the outside and exposed to sun rays will die quickly. Now, if you are inside in a room with locked windows, your chances of infection assuming you live with family members is higher. Open the windows and allow fresh air to blow thru, it lowers your risk. Key is the fresh air will blow the Corona Virus and dissipate it faster and allow it to exit your house or apartment. If you catch the Corona Virus, isolate yourself in a room assuming you live with family members and open your windows in your room.
Have a mask myself but, will probably, use it when I go out and go to the grocery store which is enclosed and not enough fresh air to dissipate the Corona Virus. Also, the airconditioning circulating the same air can spread the virus. Per Doctor David Price, most transmissions of the Corona Virus happen by contact of your dirty hands with your eyes, mouth and nose. That is how it gets into your body. Wash your hands often and keep it from your face.