Kronos Advanced Technologies Inc. announced that one of Northern California's School Districts has evaluated Kronos' patented, eco-friendly smart air purifiers and purchased sufficient quantities to keep the air pure in 55 of their classrooms. The district requested a second purchase after installing air filtration units in 55 of their classrooms. This order resulted from Kronos launching a community program to help provide safer indoor air to schools after donating air purifiers to several local schools.