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You will need proof of all vaccinations before entering the United States. The vaccination certificate with QR code, digital pass via a smartphone application with QR code (e.g., United Kingdom National Health Service COVID Pass, European Union Digital COVID Certificate). Wear of masks varies from state to state. Arizona, home to the Grand Canyon, recommends wearing a mask when using public transportation. Therefore, it is not compulsory, so you can choose according to your health. This information was confirmed on August 1, 2022. So it is recommended to check it again when traveling.