We will start by defining PUBLIC and HEALTH as separate words and then bring them together.
The name “public” originates with the Latin publicus (also poplicus), from populus, to the English word ‘populace’, and in general, denotes some mass population (“the people”) in association with some matter of common interest. In political science and history, a public is a population of individuals associated with civic affairs or affairs of office or state.
The public can refer to people in general, or all the people in a particular country or community, as the public. Something that affects the entire community — your town, country, or the world — is public.
Climate change, for example, is a public concern. The public can be as small as a handful of people or as large as a village or an entire city. The concept of health takes into account physical, psychological, and social well-being.