Philadelphia officials have announced a new indoor mask mandate to fight the latest surge in COVID-19 cases in the city. The new requirements will come into effect Thursday at 12 a.m. on and will only effect businesses and institutions that do not require proof of COVID-19 vaccination for their staff and customers, according to today’s announcement by Mayor Jim Kenney.

Some Philadelphia area restaurants have been asking their customers to show proof of vaccination to be served at their business since the delta variant began spreading last month. Those restaurants that do not have such rules will have to ask their staff and customers to wear masks inside unless they’re actively eating or drinking.

Philadelphia is now averaging at about 160 new COVID-19 cases per day, in contrast to 30 cases at the beginning of the summer.

In addition to the new indoor masking rules, unseated outdoor gatherings of more than 1,000 people will also require masks for everyone.

The city will also require their employees to be either fully vaccinated or double mask when indoors. This requirement will go into effect on September 1st.