https://www.siliconvalley.com/2022/01/14/covid-cdc-updates-mask-guidance/

(CNN) — The US Centers for Disease Control and Prevention updated its mask information for the American public on Friday, including clarifying that certain types of masks and respirators offer more protection from the coronavirus than others and offering tips on what consumers should look for when shopping for them.

“Masking is a critical public health tool to prevent the spread of COVID-19, and it is important to remember that any mask is better than no mask,” the CDC said in a statement.