Subsections COVID-19 Testing (HCPSS Program) Related FAQs: COVID-19 Testing (HCPSS Program), Health & Safety What are the requirements for students and staff to wear masks in school buildings? What are the requirements for wearing a mask on school buses? When should students stay home and what health checks should families conduct? What HVAC measures have been taken to provide maximum air filtration and ventilation in school buildings? What schools don't have MERV 13 air filters and what is being done to ensure safe indoor air quality? Why is HCPSS monitoring the carbon dioxide (CO2) concentration in school cafeterias? What is considered an elevated CO2 concentration? What causes an elevated CO2 concentration in schools? What are the risks associated with elevated CO2 concentration to students and staff in the building? Are HEPA filtration units and other mitigation efforts helping to ease CO2 concentration or possibly contributing to it? How will parents/guardians be notified if their child's school experiences elevated CO2 concentration?