Mayor Muriel Bowser, Mayor's Order 2021-097 (July 29, 2021), indoor mask requirement effective July 31, 2021, applied to schools and child care for 2021-22 (Ex. ECO-B-155)
Education Week (secondary source), Education Week, 'Which States Banned Mask Mandates in Schools, and Which Required Masks?' (Aug. 20, 2021; updated July 8, 2022; last data May 23, 2022) (Ex. ECO-B-117)
