In accordance with the latest campus guidelines, masks are optional, but recommended, in all Penn Libraries spaces. Masking is always an option for anyone who chooses to wear a mask for any reason. 

The Penn community is still encouraged to wear a mask (preferably a surgical mask, KN95/KF94, N95, or EHRS-recommended Aries mask as opposed to a single layer cloth mask), regardless of masking requirements, in the following situations: 

• if, for any reason, you want to 
• if you are not up-to-date on your COVID-19 vaccinations 
• if you are personally at high risk 
• if you are in frequent close contact with someone who is high risk 
• if you have COVID symptoms  
• if you test positive for COVID 
• if you go to an airport   
• if you have been exposed to someone with COVID 
• if you live in an area with "substantial" or "high" spread of the virus (defined as 50 to 100, or 100 or more, respectively, new weekly cases per 100,000 people).