Matt Lisiewski, center, vice president at Norman S. Wright mechanical equipment, demonstrates how the ionization air purifier system works as Clark County School District Superintendent, Jesus Jara, left, and Mark Campbell, director sustainability, energy and environmental services, look on at Roundy Elementary School, on Thursday, Oct 28, 2029, in Las Vegas. Jara reviewed the ionization systems planned to be installed at CCSD schools throughout the district. (Bizuayehu Tesfaye/Las Vegas Review-Journal) @bizutesfaye