On April 14, 2020, the New York State Department of Health issued "Interim Guidance on Executive Order 202.16 Requiring Face Coverings for Public and Private Employees Interacting with the Public During the COVID-19 Outbreak."
This document spells out Executive Order 202.16
which says all essential employees shall be provided with and shall wear face coverings when in direct contact with members of the public. Further details provide information and details about this requirement.
The document in its entirety, including hyperlinks leading to additional information, can be found at the attachment below.