"ISO 14001:2015 does not define “hazard”. It only mentions “the nature of onsite hazards (e.g. flammable liquids, storage tanks, compressed gasses)”.
Any organization interacts with the environment. Environmental aspects are the elements of an organization’s activities or products or services that interact or can interact with the environment. Those interactions may take place under normal situations, during startup or stoppage, or during abnormal or emergency situations. Environmental aspects during abnormal or emergency situations may generate particularly significant environmental impacts, environmental consequences. The word hazards are used when significant environmental impacts, significant environmental consequences are a possible outcome.
You can find more information about the aspects and hazards below: