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{{prose|date=January 2016}}
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[[File:GHS-pictogram-pollu.svg|thumb|The [[Globally Harmonized System of Classification and Labelling of Chemicals|international]]
An '''environmental hazard''' is a substance, state or event which has the potential to threaten the surrounding natural [[Environmental issue|environment]] or adversely affect people's [[health]], including [[pollution]] and [[natural disasters]] such as storms and earthquakes.<ref>{{Cite book|url=https://www.worldcat.org/oclc/42329268|title=Nursing, health & the environment : strengthening the relationship to improve the public's health|date=1995|publisher=National Academy Press|others=Pope, Andrew MacPherson, 1950-, Snyder, Meta A., Mood, Lillian H., Institute of Medicine (U.S.). Committee on Enhancing Environmental Health Content in Nursing Practice.|isbn=0-585-02694-7|location=Washington, D.C.|oclc=42329268}}</ref><ref name=":2">{{Cite web|title=Environmental Hazards & Health Effects|url=https://www.cdc.gov/nceh/ehhe/pdfs/about.pdf|url-status=live|access-date=October 15, 2021|website=[[Centers for Disease Control and Prevention]]}}</ref>
Human-made [[hazard (risk)|hazards]] while not immediately health-threatening may turn out detrimental to a human's well-being eventually, because deterioration in the environment can produce secondary, unwanted negative effects on the human [[Biosphere|ecosphere]]. The effects of [[water pollution]] may not be immediately visible because of a [[sewage system]] that helps drain off toxic substances. If those substances turn out to be persistent (e.g. [[persistent organic pollutant]]), however, they will literally be fed back to their producers via the [[food chain]]: plankton -> edible fish -> humans. In that respect, a considerable number of environmental hazards listed below are man-made [[anthropogenic hazard|(anthropogenic) hazards]].
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