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{{short description|Harmful substance, a condition or an event}}
{{more citations needed|date=September 2020}}
[[File:GHS-pictogram-pollu.svg|thumb|The [[Globally Harmonized System of Classification and Labelling of Chemicals|international]] [[GHS hazard pictograms|pictogram]] for environmental hazards.]]
==Types==
[[Chemical
[[Physical
[[Biological
Psychological hazards are aspects of work and work environments that can cause psychological harm or mental ill-health. These include factors such as stress, [[workplace bullying]], fatigue, burnout, and violence, among others. These hazards can lead to psychological issues like anxiety, depression, and post-traumatic stress disorder (PTSD). Psychological hazards can exist in any type of workplace, and their management is a crucial aspect of occupational health and safety.<ref name=":3" />
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== Chemical ==
[[Chemical hazard]]s are defined in the [[Globally Harmonized System]] and in the [[European Union]] chemical regulations. They are caused by chemical substances causing significant [[environmental damage|damage to the environment]]. The label is particularly applicable towards substances with [[aquatic toxicity]]. An example is [[zinc oxide]], a common paint pigment, which is extremely toxic to aquatic life.{{
Toxicity or other hazards do not imply an environmental hazard, because elimination by sunlight ([[photolysis]]), water ([[hydrolysis]]) or organisms (biological elimination) neutralizes many reactive or poisonous substances. Persistence towards these elimination mechanisms combined with toxicity gives the substance the ability to do damage in the long term. Also, the lack of immediate human toxicity does not mean the substance is environmentally nonhazardous. For example, tanker truck-sized spills of substances such as [[milk]] can cause a lot of damage in the local aquatic ecosystems: the added [[biological oxygen demand]] causes rapid [[eutrophication]], leading to [[Anoxic waters|anoxic conditions]] in the water body.
All hazards in this category are mainly [[Human impact on the environment|anthropogenic]] although there exist a number of natural carcinogens and chemical elements like radon and lead may turn up in health-critical concentrations in the natural environment:
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A physical hazard is a type of occupational hazard that involves environmental hazards that can cause harm with or without contact.<ref name=":2" /> Below is a list of examples:
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*{{annotated link|Fog}}
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Biological hazards, also known as biohazards, refer to biological substances that pose a threat to the health of living organisms, primarily that of humans. This can include medical waste or samples of a microorganism, virus or toxin (from a biological source) that can affect human health. Examples include:
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*{{annotated link|Allergen}}
**{{annotated link|Pollen}}, a common allergen
*{{annotated link|Arbovirus}}
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*{{annotated link|Ebola}}
*{{annotated link|Epidemic}}s
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*{{annotated link|Malaria}}
*{{annotated link|Mold}}s
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*{{annotated link|Pathogen}}s
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== See also ==
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