A new mask order announced on Thursday by D.C. Mayor Muriel Bowser went into effect at 5 a.m. Saturday.
Masks are again required indoors in the District, regardless of vaccination status for everyone older than 2 years old.
Some D.C. businesses began requiring masks and vaccines ahead of Saturday, as the delta variant of the coronavirus spreads nationwide.
WTOP has answers to some common questions about where D.C., Maryland and Virginia stand on coronavirus guidelines.
Nearby in Alexandria, Virginia, the city is now requiring everyone to wear a mask inside any government building, whether they’ve been vaccinated or not.
Alexandria is also considered to be a place of substantial risk of community transmission, with a current case rate of 62.73 per 100,000 residents.
The city said 1 out of every 20 Alexandria residents who have tested positive for COVID-19 have required hospitalization.
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WTOP’s John Domen contributed to this report.