In this subtitle the following words have the meanings indicated. “Emergency” means a catastrophic health emergency, as defined under § 14–3A–01 of the Public Safety Article, that is the subject of an executive proclamation under § 14–3A–02 of the Public Safety Article and is related to a communicable disease. “Essential employer” means a person that employs an essential worker. “Essential employer” includes a unit of State or local government. “Essential worker” means an individual who: performs a duty or work responsibility during an emergency that cannot be performed remotely or is required to be completed at the work site; and provides services that the essential employer determines to be essential or critical to its operations.