Manager Mike Bonavita wears a protective mask as he cleans windows at the Quattro Italian restaurant in Boston on May 12 during the coronavirus pandemic. This month, Massachusetts' governor declared wearing masks mandatory. Steven Senne/AP hide caption
Old Navy, a subsidiary of Gap, began selling nonmedical face masks in early May. MB Internal Studio/Old Navy hide caption
An array of homemade masks and materials NPR hide caption
Amtrak will limit bookings to half of a train's normal capacity so passengers can maintain social distance. Matt Rourke/AP hide caption
An N95 face mask outside NYU Langone Health hospital during the coronavirus pandemic. Noam Galai/Getty Images hide caption
A traveler wearing a face mask looks at the flight board at Reagan National Airport last month in Washington. JetBlue is the first major U.S. airline to require passengers to wear face coverings. Alex Edelman/AFP via Getty Images hide caption
A pharmacy employee shows KN95 protective face masks that were made in China. Companies like Golden Pacific Fashion and Design in Shanghai, which used to sell curtains, have pivoted to making KN95 masks like these. Jon Nazca/Reuters hide caption
Researcher Loretta Fernandez of Northeastern University wears a homemade face mask without and with an extra outer layer made from nylon stockings (right). The added nylon outer layer significantly boosted masks' ability to filter out small particles, her research found. Loretta Fernandez hide caption
A do-it-yourself mask culture is springing up in the Czech Republic. This woman was photographed on the Charles Bridge in Prague on March 28. Michal Cizek/AFP via Getty Images hide caption
Customers wearing facial coverings at a Starbucks in Bangkok last month. In the U.S., the company is requiring employees to wear coverings starting Tuesday. Romeo Gacad/AFP via Getty Images hide caption
A pedestrian in a face mask crosses the Williamsburg Bridge in New York City last month. U.S. health authorities have announced they're changing the official recommendations on face masks, now urging people to wear them in public spaces to help slow the spread of the coronavirus. Bryan R. Smith/AFP via Getty Images hide caption
A worker cleans an area along the Las Vegas Strip that's now devoid of the usual crowds, with casinos and many other business shuttered. John Locher/AP hide caption
A man wearing a face mask crosses the Charles Bridge in Prague on Tuesday. The Czech Republic is one of a handful of places throughout Europe now mandating that residents wear face masks when they leave their homes. Michal Cizek/AFP via Getty Images hide caption