Businesses split on mask-wearing requirements amid COVID-19 Delta variant surge Phoenix area businesses react to new CDC guidelines on mask wearing While some businesses are asking their visitors to wear masks, others say they will not enforce guidelines that are not considered to be law. FOX 10's Jennifer Martinez reports. PHOENIX - As the Delta variant of COVID-19 continues to rise among people who have yet to be vaccinated, businesses are now mandating masks again, and one of those places is museums. Phoenix Children's Museum to require masks The mask mandate at Phoenix Children's Museum, which will require anyone ages two and up to mask up, will begin immediately to ensure the safety of children inside. CEO Kate Wells says they have been following CDC Guidelines since the beginning the Pandemic.