But how states and districts interpret the guidance varies. Ohio mandates masks across the board in K-12 schools. Massachusetts requires masks for students in second grade and higher, and encourages them for younger children. South Carolina says students have to wear masks in the hallways, but can take them off in the classroom if a teacher allows it.
Rules vary outside the United States, too. In Germany, Berlin requires masks in hallways, but not during classroom instruction. In the western state of North Rhine-Westphalia, masks are required in class as well. In the northern Italian town of Codogno that was hit hard by the virus, elementary and middle school students have to wear masks. They can be lowered during lessons, unless students can't maintain distance.