Occupational toxicity regulating safety in various organised and unorganised sectors: A minor review

Occupational toxicology is a branch of toxicology that focuses on the study and assessment of the effects of chemicals, substances, and other potentially harmful agents in the workplace. This field is critical for ensuring the health and safety of workers by identifying, evaluating, and controlling exposures to hazardous substances. Occupational toxicologists identify chemicals, dusts, fumes, gases, and physical agents (like radiation) that workers may be exposed to during their jobs and also their routes of exposure. The dose of the toxic substances and the grade of exposures can be calculated by occupational toxicologists. Developing safety guidelines and regulations, such as Permissible Exposure Limits (PELs) and Threshold Limit Values (TLVs), to protect workers. Exposure to toxic substances can lead to various occupational diseases, such as respiratory disorders, skin conditions, neurological effects, and cancers. Occupational toxicology aims to identify and prevent these health outcomes. Recommending the use of PPE, such as gloves, masks, and protective clothing, to minimize direct exposure. There are many standardise protocols have been followed in terms of taking best protection like OSHA, NIOSH or many other globally acclaimed bodies. Occupational toxicology is essential for maintaining a safe work environment. By understanding the risks associated with workplace exposures, toxicologists help in designing safer industrial processes, implementing effective control measures, and developing policies that protect workers from harmful effects, thereby reducing the incidence of occupational diseases and improving overall workplace health.

Illustrations explain the paper; they do not show study data.

AI-generated illustration

↗ Enlarge

Hierarchy of Occupational Safety ControlsClose ×

AI-generated conceptual illustration (Industrial workplace equipment and safety gear). It explains the idea and does not show study data.

Open full-size image ↗

Introduction

Occupational toxicology is the study of harmful effects of various chemical, biological, and physical agents that workers may be exposed to in the workplace. It aims to understand how these substances can affect human health, both in the short term (acute exposure) and over prolonged periods (chronic exposure), as well as to develop safety standards to minimize risks [1] . These include chemicals (e.g., solvents, pesticides), biological agents (e.g., bacteria, fungi), and physical agents (e.g., radiation, noise) that can harm workers if not properly managed. Exposure to them in many ways may lead to cause such events of clinical correlations. There are many ways by which the infection can occur like inhalation, ingestion, dermal contact and intravenous etc. [2] . Breathing in toxic vapours, gases, dust, or fibers (common with airborne pollutants). Swallowing contaminated substances (usually accidental).Direct contact with harmful substances that can penetrate the skin. Involuntary exposure due to puncture wounds, like needle sticks in healthcare settings. The relationship between the amount of exposure to a substance and the extent of toxic effects. This is a central principle in toxicology generally, higher doses lead to more severe effects [3] . Drug based dosages are sometimes extremely harmful for sustainability and even fatal in many cases. Rapid onset of symptoms after exposure to a high concentration of a toxic substance over a short period. Long-term effects of repeated exposure to lower levels of toxic substances. This can lead to diseases such as cancer, respiratory conditions, or neurological disorders [4] . Some substances may cause cancer after prolonged exposure. Some agents affect reproductive health, causing birth defects or infertility. This involves identifying potential hazards, evaluating the level of exposure, and assessing the potential health risks [5] . It helps in establishing Occupational Exposure Limits (OELs) that set maximum allowable levels of harmful substances in the workplace.

Modifying equipment or processes to reduce exposure (e.g., ventilation systems, enclosures) to such toxic substances, using gloves, masks, goggles, or protective clothing to minimize exposure and implementing safety protocols, training, and work schedules to limit exposure time [6] . Occupational toxicologists work closely with regulatory agencies like the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) to set standards and enforce regulations that protect workers from toxic exposures [7] . Occupational toxicology is essential in protecting workers' health and safety, particularly in industries such as manufacturing, agriculture, healthcare, and chemical processing. By identifying hazards and implementing preventive measures, it helps reduce the incidence of occupational diseases and accidents. On the contrary, occupational toxicology focuses on understanding how workplace exposures to hazardous substances can affect health and what can be done to minimize these risks. It is critical for promoting safe working environments [8] .

Diseases caused due to various types of occupational toxicity

There are various diseases occur due to continuous exposure in these toxic substances as subjects get exposed to it for extraordinary time, near about 8 to 10 hours. Exposure to toxic agents in the workplace can lead to various occupational diseases, depending on the type of substance, the level of exposure, and the duration. Below are some key diseases and conditions associated with occupational toxicology:

At first some of the respiratory diseases are as follows (9, 10) Occupational asthma: Caused by exposure to airborne irritants like chemicals (isocyanates, cleaning agents), dust, or fumes. Workers in industries like manufacturing, painting, and healthcare are particularly at risk.

Chronic Obstructive Pulmonary Disease (COPD)

Linked to long-term exposure to industrial dust, fumes, and chemicals. Miners, construction workers, and those exposed to smoke are often affected. Pneumoconiosis: A group of lung diseases caused by the inhalation of dust, which includes: Silicosis: From inhaling crystalline silica dust (common in mining, quarrying, and construction). Asbestosis: Caused by asbestos exposure (common in construction, shipbuilding, and manufacturing).

Coal worker's pneumoconiosis (Black lung disease)

Caused by coal dust exposure in miners. Other than this some of the chronic clinical conditions like cancers can also occur due to occupational toxicity. For example: Linked to asbestos, arsenic, chromium, and certain organic solvents. Workers in industries like construction, manufacturing, and mining are at higher risk. A rare cancer of the lining of the lungs or abdomen called Mesothelioma, almost exclusively caused by asbestos exposure [11] . Bladder Cancer is associated with exposure to aromatic amines in industries such as dye manufacturing and rubber production. Lung Cancer relating to asbestos, arsenic, chromium, and certain organic solvents. Workers in industries like construction, manufacturing, and mining are at higher risk [12] . Leukemia associated with to benzene exposure in industries like petrochemical production, shoe manufacturing, and printing. Prolonged exposure to sunlight (for outdoor workers) or to chemicals such as polycyclic aromatic hydrocarbons (PAHs) and arsenic can increase the risk of skin cancer [12] . Neurological disease can also occur due to prolonged exposure to lead in industries like battery manufacturing, smelting, and painting can cause neurological damage, cognitive impairments, and behavioral changes. Common in industries like gold mining, chemical manufacturing, and healthcare (from broken thermometers or fluorescent lights). Chronic exposure leads to tremors, memory loss, and cognitive dysfunction. Workers in industries that use organic solvents (like painting, printing, and degreasing) can develop memory loss, depression, and behavioral changes. Linked to neurodegenerative diseases like Parkinson's disease in agricultural workers who have long-term exposure to certain pesticides (e.g., paraquat) [13] . Skin Disorders like contact dermatitis caused by direct exposure to irritants or allergens like chemicals, detergents, and solvents. Workers in healthcare, hairdressing, and manufacturing are particularly prone to developing this condition. Chloracne is a skin condition similar to acne, caused by exposure to chlorinated hydrocarbons (e.g., dioxins). This condition is more common in chemical and pesticide manufacturing workers [14] . Reproductive and Developmental Disorders for example infertility which shows exposure to heavy metals (lead, cadmium), solvents, and pesticides can lead to infertility in both men and women. For example, lead exposure is known to impair sperm quality in men. Pregnant women exposed to certain chemicals like mercury, lead, or phthalates (commonly found in plastics) can have a higher risk of delivering babies with birth defects. Frequent occurrence long-term exposure to solvents and pesticides is linked to an increased risk of miscarriage [15] . Liver and Kidney Diseases like Hepatotoxicity (Liver Damage) include certain solvents (e.g., carbon tetrachloride) and heavy metals (e.g., lead, arsenic) can cause liver damage, which may lead to conditions like cirrhosis or liver cancer. Nephrotoxicity (Kidney Damage) shows prolonged exposure to heavy metals like lead, cadmium, and mercury, commonly found in manufacturing and mining industries, can result in kidney failure or chronic kidney disease [16] . Hematological (Blood) Disorders like aplastic anemia which is linked to exposure to benzene, commonly used in the petrochemical industry, printing, and shoe manufacturing. This condition occurs when the bone marrow fails to produce sufficient blood cells [17] . Other than this Hemolytic Anemia caused by certain chemicals and heavy metals, like arsenic, that destroy red blood cells prematurely. Many researchers revealed that many workers exposed to combustion engines, particularly in poorly ventilated areas (e.g., garages, factories), are at risk of inhaling carbon monoxide, leading to poisoning that can cause headache, dizziness, confusion, or even death [18] . Cyanide exposure, common in industries like gold mining, electroplating, and chemical manufacturing, can be fatal in high doses. Chronic exposure leads to symptoms like headaches, dizziness, and respiratory distress. Musculoskeletal Disorders incorporate vibration White Finger (Hand-Arm Vibration Syndrome) which shows like prolonged exposure to vibration from tools like jackhammers and chainsaws can cause blood vessel and nerve damage in the hands and arms [19] . Muscle weakness and damage resulting from prolonged exposure to certain toxic chemicals, such as solvents or heavy metals, affecting workers in industries like painting, electronics, and metalworking [20] .

Conclusion

Occupational diseases can often be prevented by in many ways like substitution of less toxic materials, engineering controls (e.g., ventilation, enclosure of processes), administrative controls (e.g., training, work rotation), Personal Protective Equipment (PPE) (e.g., respirators, gloves, protective clothing). Regular monitoring of exposure levels and health surveillance for early detection of problems. Understanding the risks and implementing proper safety measures can help minimize the incidence of these occupational diseases [22] . Controlling occupational toxicity involves several therapeutic interventions and preventive measures aimed at minimizing the harmful effects of toxic exposures in the workplace. These therapies are focused on reducing exposure, treating symptoms of toxicity, and preventing the recurrence of harmful health outcomes [23] . The management of occupational toxicity requires a comprehensive approach, combining engineering controls, administrative measures, personal protective equipment, and medical interventions [24] . Preventive strategies help reduce the risk of exposure, while medical treatments aim to manage acute and chronic toxic effects. Long-term monitoring and rehabilitation ensure that workers receive appropriate care and are protected from future risks. Effective control of occupational toxicity is essential for maintaining workers' health and safety in hazardous environments.

1. Landrigan PJ, Baker DB. The recognition and control of occupational disease. JAMA. 1991;266(5):676-680.
2. Perlman DM, Maier LA. Occupational lung disease. Med Clin. 2019;103(3):535-548.
3. Scammell MK, Sennett CM, Petropoulos ZE, Kamal J, Kaufman JS. Environmental and occupational exposures in kidney disease. Semin Nephrol. 2019 May;39(3):230-243.
4. Newman LS. Occupational illness. N Engl J Med. 1995;333(17):1128-1134.
5. Riva MA, Lafranconi A, D'orso MI, Cesana G. Lead poisoning: historical aspects of a paradigmatic "occupational and environmental disease." Saf Health Work. 2012;3(1):11-16.
6. Rim KT. Exposure of chemical mixtures at work and their application to the prevention of occupational disease. Toxicol Environ Health Sci. 2021;13:91-99.
7. Salleh N, Yhaya MF, Ghafar NA, Muslim NZM, Hamzah NA. Occupational-related disease to the toxicity of benzene derivatives exposure among working populations: A review. Malays J Med Health Sci. 2021;17.
8. Ross MH, Murray J. Occupational respiratory disease in mining. Occup Med. 2004;54(5):304-310.
9. Michaelis S, Burdon J, Howard CV, World Health Organization. Aerotoxic syndrome: a new occupational disease? Public Health Panorama. 2017;3(2):198-211.
10. Tiller JR, Schilling RS, Morris JN. Occupational toxic factor in mortality from coronary heart disease. Br Med J. 1968;4(5628):407-411.
11. Kaur K, Kaur R. Occupational pesticide exposure, impaired DNA repair, and diseases. Indian J Occup Environ Med. 2018;22(2):74-81.
12. Nishida C, Yatera K. The impact of ambient environmental and occupational pollution on respiratory diseases. Int J Environ Res Public Health. 2022;19(5):2788.
13. Rim KT. Occupational exposure to mixtures and toxic pathways prediction for workers' health. Mol Cell Toxicol. 2023;19(4):775-788.
14. Markowitz SB, Fischer E, Fahs MC, Shapiro J, Landrigan PJ. Occupational disease in New York State: a comprehensive examination. Am J Ind Med. 1989;16(4):417-435.
15. Oliver LC, Zarnke AM. Sarcoidosis: an occupational disease? Chest. 2021;160(4):1360-1367.
16. Gangemi S, Miozzi E, Teodoro M, Briguglio G, De Luca A, Alibrando C, et al. Occupational exposure to pesticides as a possible risk factor for the development of chronic diseases in humans. Mol Med Rep. 2016;14(5):4475-4488.
17. Flack S, Nylander-French LA. Occupational chemicals: metabolism, toxicity, and mode of action. Prog Mol Biol Transl Sci. 2012;112:163-207.
18. Update of occupational lung disease. J Occup Health. 2019;61(1):10-18.
19. McCunney RJ, Yong M, Warheit DB, Morfeld P. Occupational exposure to poorly soluble low toxicity particles and cardiac disease: a look at carbon black and titanium dioxide. Front Public Health. 2022;10:909136.
20. Linz DH, Barker AF, Morton WE, deGarmo PL. Occupational toxic inhalations. Adv Emerg Nurs J. 1985;7(1):21-33.4o mini