LANSING, Mich. — Michigan Gov. Gretchen Whitmer has toughened a requirement to wear masks during the coronavirus pandemic, mandating businesses open to the public deny service or entry to customers who refuse to wear one.

The governor also expanded where people must have a face covering beyond indoor public spaces. Starting immediately, they must wear one outdoors if they cannot consistently keep 6 feet from non-household members. A mask is needed while using public transportation, a taxi or a ride-sharing vehicle, with some exceptions.

“No shirts, no shoes, no mask — no service,” Whitmer wrote in an order. Violators will be subject to a misdemeanor fine.

Whitmer points to “stalled” progress in suppressing the virus. Cases have risen in Michigan and she says spotty compliance with her monthslong mask requirement is a “big part of the reason.”