DAYTON, Ohio (WDTN) – The Centers for Disease Control and Prevention has updated guidelines for mask wearing in public.

The change to the guidelines were announced Friday afternoon. The CDC has a tool on its website to help counties determine the precautions that should be taken against COVID-19.

According to the CDC’s website, only counties with high COVID-19 community levels are recommended to wear masks. For the state of Ohio, most counties are under a medium transmission level. Fifteen counties are under a high level.

In the Miami Valley, the majority of counties are under a medium transmission level.

The following counties in the Miami Valley are at medium transmission:

  • Montgomery 
  • Greene
  • Preble
  • Darke
  • Mercer
  • Auglaize

These counties are at low transmission:

  • Miami 
  • Shelby

Counties with high transmission where masks are still recommended include Clark, Logan and Champaign.