On a construction site, everyone is required to wear a hard hat. Schoolchildren too young to be vaccinated are not required to wear a mask in Salt Lake County. There are differences in these situations:
First, the odds of a child being exposed to the COVID-19 virus at school are many times greater than a construction worker being hit by a falling object.
Second, a hard hat protects only the one wearing it. A mask helps protect anyone nearby, as well as the wearer.
Salt Lake City