:Chemical hazard

{{See also|Hazard}}

The most common exposure route to chemicals in the work environment is through inhalation.{{Cite book|last=Hansen|first=Doan J.|url=https://books.google.com/books?id=466Lyv3kwLEC|access-date=2023-11-14|title=The Work Environment: Indoor Health Hazards|date=1993-12-17|publisher=CRC Press|isbn=978-0-87371-393-1|language=en}} Gas, vapour, mist, dust, fumes, and smoke can all be inhaled. Those with occupations involving physical work may inhale higher levels of chemicals if working in an area with contaminated air. This is because workers who do physical work will exchange over 10,000 litres of air over an 8-hour day, while workers who do not do physical work will exchange only 2,800 litres.{{Cite web|last=Government of Canada|first=Canadian Centre for Occupational Health and Safety|date=2020-11-12|title=Canadian Centre for Occupational Health and Safety|url=https://www.ccohs.ca/oshanswers/chemicals/how_chem.html/|access-date=2020-12-01|website=www.ccohs.ca|url-status=dead|archive-date=2022-06-29|archive-url=https://web.archive.org/web/20220629133127/https://www.ccohs.ca/oshanswers/chemicals/how_chem.html}} If the air is contaminated in the workplace, more air exchange will lead to the inhalation of higher amounts of chemicals.{{Cite web |date=2023-05-25 |title=Lead (Pb) Toxicity: What Are Routes of Exposure to Lead? {{!}} Environmental Medicine {{!}} ATSDR |url=https://www.atsdr.cdc.gov/csem/leadtoxicity/exposure_routes.html |access-date=2024-04-07 |website=www.atsdr.cdc.gov |language=en-us}}

Chemicals may be ingested when food or drink is contaminated by unwashed hands or from clothing or poor handling practices.{{Cite web|last=Collier|first=Ellie|date=2019-08-26|title=What Are The 4 Types Of Food Contamination?|url=https://www.highspeedtraining.co.uk/hub/four-types-contamination/|access-date=2023-02-28|website=The Hub - High Speed Training|language=en-GB}} When ingestion of a chemical hazard occurs it comes from when those said chemicals are absorbed while in the digestive tract of the body. Ingestion only occurs when food or drink has contact with the toxic chemical. This can happen through direct or indirect ingestion. When food or drink is brought into an environment where harmful chemicals are unsealed there is the possibility of those chemical vapors or particles contaminating the food or the drink. A more direct form of chemical ingestion is the possibility of consuming the chemical directly. This rarely happens but, it is possible, that if there is little to no labeling on the chemical containers and if they are not secured properly an accident can occur which could lead to someone mistakenly assuming the chemical was something it was not.{{Cite web |title=7.4.2 Ingestion {{!}} Environment, Health and Safety |url=https://ehs.cornell.edu/research-safety/chemical-safety/laboratory-safety-manual/chapter-7-safe-chemical-use/74-routes-1 |access-date=2024-04-07 |website=ehs.cornell.edu}}

File:Chemical_Burn.jpg are one type of chemical hazard]]

Chemical exposure to the skin is a common workplace injury and may also occur in domestic situations with chemicals such as bleach or drain-cleaners. The exposure of chemicals to the skin most often results in local irritation to the exposed area.{{Cite web|date=2022-11-09|title=Skin Exposures and Effects - NIOSH - CDC|url=https://www.cdc.gov/niosh/topics/skin/default.html|access-date=2023-07-28|website=www.cdc.gov|language=en-us}} In some exposures, the chemical will be absorbed through the skin and will result in poisoning. The eyes have a strong sensitivity to chemicals, and are consequently an area of high concern for chemical exposure. Chemical exposure to the eyes results in irritation and may result in burns and vision loss.{{Cite web|date=2018-12-05|title=Chemical Injury to the Eye|url=https://www.health.harvard.edu/a_to_z/chemical-injury-to-the-eye-a-to-z|access-date=2023-02-28|website=Harvard Health|language=en}}

Injection is an uncommon method of chemical exposure in the workplace. Chemicals can be injected into the skin when a worker is punctured by a sharp object, such as a needle. Chemical exposure through injection may result in the chemical entering directly into the bloodstream.{{Cite web|last=Government of Canada|first=Canadian Centre for Occupational Health and Safety|date=2023-02-28|title=How Workplace Chemicals Enter the Body : OSH Answers|url=https://www.ccohs.ca/oshanswers/chemicals/how_chem.html|access-date=2023-02-28|website=www.ccohs.ca|language=en}}

File:GHS HAZCOM Safety Labels.jpg]]

Hazard pictograms are a type of labeling system that alerts people at a glance that there are hazardous chemicals present. The symbols help identify whether the chemicals that are going to be in use may potentially cause physical harm, or harm to the environment. The 9 symbols are:{{cite web|title=Hazard symbols and hazard pictograms - Chemical classification|url=http://www.hse.gov.uk/chemical-classification/labelling-packaging/hazard-symbols-hazard-pictograms.htm|website=hse.gov.uk|publisher=Health and Safety Executive|access-date=2016-02-11|language=en}}

• Explosive (exploding bomb)
• Flammable (flame)
• Oxidizing (flame above a circle)
• Corrosive (corrosion of table and hand)
• Acute toxicity (skull and crossbones)
• Hazardous to environment (dead tree and fish)
• Health hazard/hazardous to the ozone layer (exclamation mark)
• Serious health hazard (cross on a human silhouette)
• Gas under pressure (gas cylinder)

These pictographs are also subdivided into class and categories for each classification.{{cite web |title=UN Recommendations on the Transport of Dangerous Goods - Model Regulations |url=http://www.unece.org/trans/danger/publi/unrec/rev19/19files_e.html |url-status=live |archive-url=https://web.archive.org/web/20161117032522/http://www.unece.org/trans/danger/publi/unrec/rev19/19files_e.html |archive-date=2016-11-17 |access-date=2015-11-06 |publisher=United Nations Economic Commission for Europe |pages=59–60 |language=en |volume=I |version=rev. 9}} The assignments for each chemical depends on their type and their severity. The standard set of 9 hazard pictograms was published and distributed as a regulatory requirement through the efforts of the United Nations via the Globally Harmonized System of Classification and Labelling of Chemicals.{{cite web |title=A Guide to The Globally Harmonized System of Classification and Labelling of Chemicals |url=https://www.osha.gov/dsg/hazcom/ghsguideoct05.pdf |access-date=15 November 2018 |website=Occupational Safety and Health Administration, United States of America |publisher=OSHA, U.S.A. |language=en}}

File:NIOSH Health Hazard Evaluations- Sampling for Exposures.webm

Chemical exposure is estimated to have caused approximately 190,000 illnesses and 50,000 deaths of workers annually.{{Cite web|title=Why Transition? - Transitioning to Safer Chemicals - Occupational Safety and Health Administration|url=https://www.osha.gov/dsg/safer_chemicals/why_transition.html#note1|access-date=2020-12-01|website=www.osha.gov|language=en}} There exists an unknown link between chemical exposure and subsequent illness or death. Therefore, the majority of these illnesses and deaths are thought to be caused by a lack of knowledge or awareness concerning the dangers of chemicals. The best method of controlling chemical exposure within the workplace is through the elimination or the substitution of all chemicals that are thought or known to cause illness or death.{{Cite web |title=Hierarchy of Controls {{!}} Environmental Health & Safety (EHS) |url=https://ehs.utexas.edu/working-safely/safety-programs/hierarchy-of-controls |access-date=2024-04-07 |website=ehs.utexas.edu}}

Although elimination and substitution of harmful chemicals is the best known method for controlling chemical exposure, there are other methods that can be implemented to diminish exposure. The implementation of engineering controls is an example of another method for controlling chemical exposures. When engineering controls are implemented, there is a physical change made to the work environment that will eliminate or reduce the risk to chemical exposure. An example of engineering controls is the enclosure or isolation of the process that creates the chemical hazard.

If the process that creates the chemical hazard cannot be enclosed or isolated, the next best method is the implementation of administrative controls and work practices controls. This is the establishment of administrative and work practices that will reduce the amount of time and how often the workers will be exposed to the chemical hazard. An example of administrative and work practices controls is the establishment of work schedules in which workers have rotating job assignments. This will ensure that all workers have limited exposure to chemical hazards.

Employers should provide personal protective equipment (PPE) to protect their workers from chemicals used within the workplace. The use of PPE prevents workers from being exposed to chemicals through the routes of exposure—inhalation, absorption through skin or eyes, ingestion, and injection. One example of how PPE usage can prevent chemical exposure concerns respirators. If workers wear respirators, they will prevent the exposure of chemicals through inhalation.

In case of an emergency, it is recommended to understand first aid procedures in order to minimize any damage. Different types of chemicals can cause a variety of damage. Most sources agree that it is best to rinse any contacted skin or eye with water immediately. Currently, there is insufficient evidence of how long the rinsing should be done, as the degree of impacts will vary for substances such as corrosive chemicals.

Transporting the affected person to a health care facility may be important, depending on condition. If the victim needs to be transported before the recommended flush time, then flushing should be done during the transportation process. Some chemical manufacturers may state the specific type of cleansing agent that is recommended.{{Cite web|url=https://www.ccohs.ca/oshanswers/chemicals/firstaid.html|title=First Aid for Chemical Exposures : OSH Answers|publisher=Canadian Centre for Occupational Health and Safety|website=www.ccohs.ca|access-date=2016-03-17|language=en}}

{{excerpt|Carcinogen}}

A 2017 SBU report found evidence that workplace exposure to silica dust, engine exhaust or welding fumes is associated with heart disease.{{Cite web|url=http://www.sbu.se/en/publications/sbu-assesses/occupational-health-and-safety--chemical-exposure/|title=Occupational health and safety – chemical exposure|publisher=Swedish Agency for Health Technology Assessment and Assessment of Social Services (SBU)|website=www.sbu.se|language=en|access-date=2017-06-01|archive-url=https://web.archive.org/web/20170606093333/http://www.sbu.se/en/publications/sbu-assesses/occupational-health-and-safety--chemical-exposure/|archive-date=2017-06-06|url-status=dead}} Associations exist for exposure to arsenic, benzopyrenes, lead, dynamite, carbon disulfide, carbon monoxide, metalworking fluids and occupational exposure to tobacco smoke. Working with the electrolytic production of aluminium, or the production of paper when the sulfate pulping process is used, is associated with heart disease. An association was found between heart disease and exposure to compounds which are no longer permitted in certain work environments, such as phenoxy acids containing TCDD (dioxin) or asbestos.

Workplace exposure to silica dust or asbestos is also associated with pulmonary heart disease. There is evidence that workplace exposure to lead, carbon disulfide, or phenoxy acids containing TCDD, as well as working in an environment where aluminium is being electrolytically produced, are associated with stroke.

=== Reproductive and developmental disorders ===

Pesticides and carbon disulfide, amongst many other chemical species have been linked to disruptions of endocrine balances in the brain and ovaries.{{Cite web |date=2023-05-01 |title=How Reproductive Hazards Can Affect Your Health {{!}} NIOSH {{!}} CDC |url=https://www.cdc.gov/niosh/topics/repro/femalehealthimpact.html |access-date=2024-04-07 |website=www.cdc.gov |language=en-us}} Any contact with harmful chemicals during the first few months of pregnancy or even after has been connected to some miscarriages and has affected the menstrual cycle to the point that it has been able to block ovulation. Chemicals inducing health issues during pregnancy may also affect infants or fetuses. {{Cite web |title=Reducing Prenatal Exposure to Toxic Environmental Agents |url=https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2021/07/reducing-prenatal-exposure-to-toxic-environmental-agents |access-date=2024-04-07 |website=www.acog.org |language=en}}

• {{annotated link|Biocontainment}}
• {{annotated link|Biological agent}}
• {{annotated link|Biosafety level}}
• {{annotated link|Chemical safety}}
• Health hazard{{snd}}Hazards that would affect the health of exposed persons.
• {{annotated link|Hierarchy of hazard controls}}
• {{annotated link|Occupational exposure banding}}
• {{annotated link|Occupational hazard}}
• {{annotated link|Planetary protection}}
• Process safety – Discipline dealing with the study and management of fires, explosions and toxic gas clouds from hazardous materials in process plants.
• {{annotated link|Public health}}

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{{Occupational safety and health}}

{{Portal bar|Chemistry}}