Philly's mask mandate returns as group sues city

• The group accuses city health officials of usurping the "power and authority" of the state.

Catch up fast: Philly is the first major U.S. city to reinstate its indoor mask mandate, which it had dropped in early March.

• The city moved to Level 2 of its four-tiered system last week, after COVID-19 cases began to rise again. City health officials say the Omicron subvariant B.A.2 is driving the increase.
• As of last Sunday, the positivity rate is 7.7%, a drastic decrease compared to the height of Omicron over the winter.

Of note: The city's mask mandate is at odds with the CDC, which currently does not recommend mandated masking here.

How it works: Masks are required in all indoor public spaces, including schools, child care settings, businesses, restaurants and government buildings.

• The city will rely on the public to report businesses not complying to the city's 311 hotline.

Flashback: The Pennsylvania Supreme Court struck down the governor's statewide mask mandate in schools in December.

• The high court found that Gov. Tom Wolf's administration didn't have the authority to impose such a requirement, the AP reports.