As extreme cold weather grips large sections of the United States, people still need to work and live their lives. CNN wellness expert Dr. Leana Wen has guidance.

With a high not expected to get above zero on Jan. 23, here are some tips for staying safe in cold weather.

Over the next few days, when wind chills could drop to minus 30 or minus 40 degrees, the cold can quickly become harmful to your health.