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PHO
may refer to:
Primary Health Organisation
Primary Health Organisation
Primary Health Organisations , in New Zealand, are health care providers that are funded on a capitation basis by the New Zealand Government via District Health Boards...
Potentially hazardous object
Potentially Hazardous Object
A potentially hazardous object is an asteroid or comet with an orbit such that it has the potential to make close approaches to the Earth and a size large enough to cause significant regional damage in the event of impact....
, an asteroid or comet that could potentially collide with Earth