Hello MPS!  Please see the press release made yesterday: 

With the overall number of active and overall COVID-19 cases dropping in the state and nation, school districts received notice that the Centers for Disease Control and Prevention (CDC) has revised the requirements for public transportation.

According to a news release, the CDC has lifted its order requiring the wearing of masks on buses or vans operated by public or private school systems, including early care and education/childcare programs.