Kansas becomes latest state to make wearing masks in public mandatory

• "This is a simple, proactive step we can take to keep Kansans at work, get our kids back to school, and keep ourselves and our neighbors healthy," Kelly said.

The big picture: Other states to have introduced mandatory measures for face masks are: California, Connecticut, Delaware, Hawaii, Illinois, Kentucky, Maine, Maryland, Massachusetts, Michigan, New Jersey, New Mexico, New York, North Carolina, Pennsylvania, Rhode Island and Washington.

• The District of Columbia has also introduced measures on face coverings.

Go deeper: Mask mandates may have prevented hundreds of thousands of coronavirus cases