Researchers from the Lawrence Berkeley National Lab and UC Davis recently released a study looking at ventilation in California schools – several right here in the Bay Area. Their findings: 85 percent of classrooms had levels of carbon dioxide, or CO2, above acceptable levels of 1,000 parts per million, having the potential to impact students’ health and academic performance. NBC Bay Area’s Investigative Unit was able to track down one school district in Santa Clara County where students and staff have been taking notice, and steps to address it.