Social distancing indoors is not always effective in preventing infection from SARS-CoV-2. We recommend wearing high-efficiency masks when you are indoors with other people, especially in a confined space with poor ventilation. Because SARS-CoV-2 can linger in the air for hours since it was last exhaled, it is still possible to get infected even after the infected person has left the room. Indoor settings pose the highest risk of contracting this virus.
Although popular, basic masks and other types of face coverings (such as bandanas and those made from cotton) should be seen as a last resort, it is better than nothing! This holds true for whatever indoor space you find yourself in without a high-efficiency mask, whether it be a quick taxi ride or a short encounter with a gas-station clerk. Every minute spent in those places without proper masking increases your risk of infection.