East Bay Getting to Zero
COVID, Prevention

You can improve indoor air quality and reduce the risk of getting sick from respiratory viruses by optimizing ventilation in indoor spaces, in homes and where-ever you are:

  • Having as many activities outdoors as possible, especially while eating, drinking, singing, shouting and exercising.
  • In indoor spaces by:
    • keeping windows and doors open, ideally on multiple sides for cross-ventilation.
    • running fans to increase air flow at windows and doors, pointing away from the group.
    • running HVAC systems with MERV 13+ filters to clean the air.
    • running HEPA air purifiers at the maximum rate tolerable starting at least an hour before gathering, during the gathering and at least an hour after to clean the air. Here’s a DIY HEPA air filter design for a lower cost ($60-80) option.
    • aiming for at least 5 air changes an hour.
    • See more CDC indoor ventilation guidance here.
  • If the outdoor air quality or weather is poor and you can’t keep windows and doors open, run the HVAC system and/or air purifiers at the highest settings tolerable.
  • Check out these ventilation tools to see how virus particle levels change when you use different interventions, such as opening windows and using air filters or HVAC systems.