Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
UPDATE
Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the guidance for fully vaccinated people. CDC recommends universal indoor masking for all teachers, staff, students, and visitors to K-12 schools, regardless of vaccination status. Children should return to full-time in-person learning in the fall with layered prevention strategies in place.
UPDATE
The White House announced that vaccines will be required for international travelers coming into the United States, with an effective date of November 8, 2021. For purposes of entry into the United States, vaccines accepted will include FDA approved or authorized and WHO Emergency Use Listing vaccines. More information is available here.
UPDATE
Travel requirements to enter the United States are changing, starting November 8, 2021. More information is available here.

Interactive School Ventilation Tool

Interactive School Ventilation Tool

Small particles that people breathe out can contain virus particles, including the virus that causes COVID-19.  If a teacher or student in your classroom has been infected with the virus, improving ventilation (air flow) can help prevent virus particles from accumulating in the air. Good ventilation, along with other preventive actions, can help prevent you from getting and spreading COVID-19.

Visit the Interactive Home Ventilation Tool to learn how to improve ventilation in your home.

How can I decrease the level of particles during the school day?

Select the options below to see how particle levels change as you adjust ventilation settings.

(To see the effects of these ventilation settings on different room sizes and HVAC system types, see this report from the National Institute of Standards and Technology.)

The risk of getting COVID-19 varies according to individual susceptibility and the number of virus particles to which a person is exposed. The fewer virus particles in the air, the better.

Download Data [CSV – 523 B]

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