The federal Department of Education announced its first Green Ribbon School award winners, honoring 78 schools that are exemplary in reducing environmental impacts, creating healthy learning environments, and teaching environmental literacy.

Today we celebrate healthy and green indoor school environments on the 10th anniversary of National Healthy Schools Day. And the air needs clearing: the EPA has estimated that half of all U.S. schools have indoor air problems. Your school can take these simple low-cost or free steps to improve indoor air at school.