10 chemicals of public health concern | WHO

10 chemicals of public health concern | WHO: The World Health Organization (WHO) has identified a comprehensive list of 10 chemicals that pose significant public health concerns due to their potential to cause adverse health effects. These chemicals, ranging from heavy metals like lead and mercury to environmental pollutants such as dioxins and volatile organic compounds (VOCs), are ubiquitous in our surroundings, present in various occupational settings, consumer products, and environmental sources. Understanding the health risks associated with these chemicals is paramount for public health practitioners, policymakers, and the general population alike. In this presentation, we will delve into the WHO’s list of 10 chemicals of concern, exploring their sources, health effects, and implications for global health.

Table of Contents

Arsenic

Arsenic is a naturally occurring chemical element found in the Earth’s crust, soil, water, and air. It exists in various forms, with inorganic arsenic compounds being the most toxic. Arsenic contamination in drinking water is a significant public health concern, particularly in regions where natural geological processes release arsenic into groundwater. Chronic exposure to arsenic through contaminated water or food can lead to a range of health problems, including skin lesions, cancers of the skin, bladder, and lungs, as well as cardiovascular and neurological effects. The World Health Organization (WHO) has set guidelines for arsenic levels in drinking water to protect public health. Effective mitigation strategies, such as water treatment and dietary interventions, are essential for reducing arsenic exposure and safeguarding human health.

Asbestos

Asbestos is a group of naturally occurring minerals composed of thin, fibrous crystals that are heat-resistant and durable. Historically, asbestos has been widely used in various industries for its insulation and fire-retardant properties. However, exposure to asbestos fibers can pose serious health risks. Inhalation of asbestos fibers can lead to lung diseases such as asbestosis, lung cancer, and mesothelioma—a rare cancer affecting the lining of the lungs, abdomen, or heart. While the use of asbestos has declined in many countries due to health concerns, past exposure continues to present risks, particularly in occupational settings such as construction, shipbuilding, and mining. Efforts to regulate and mitigate asbestos exposure are critical for protecting the health of workers and the general population.

Benzene

Benzene is a colorless, flammable liquid with a sweet odor that is used widely in the production of plastics, rubber, lubricants, dyes, detergents, and other chemicals. It is also present in tobacco smoke, gasoline, and vehicle emissions. Benzene exposure can occur through inhalation, ingestion, or skin contact. Chronic exposure to benzene has been linked to serious health effects, including leukemia (cancer of the blood-forming organs), anemia, and immune system damage. The International Agency for Research on Cancer (IARC) classifies benzene as a Group 1 carcinogen, meaning it is known to cause cancer in humans. Occupational exposure to benzene is a concern for workers in industries such as petroleum refining, chemical manufacturing, and rubber production. Stringent regulations and workplace safety measures are essential for minimizing benzene exposure and protecting public health.

Cadmium

Cadmium exerts toxic effects on the kidneys as well as the skeletal and respiratory systems. It is classified as a human carcinogen. It is generally present in the environment at low levels; however, human activity has greatly increased levels in environmental media relevant to population exposure. Exposures potentially of particular concern for children include disposal and recycling of electronic and electrical waste, as well as toys, jewellery and plastics containing cadmium.

Dioxins and dioxin-like substances

Dioxins and dioxin-like substances, including PCBs, are persistent organic pollutants (POPs) covered by the Stockholm Convention. They can travel long distances from the source of emission, and bioaccumulate in food chains.

Inadequate or excess fluoride

Fluoride intake has both beneficial effects – in reducing the incidence of dental caries – and negative effects – in causing tooth enamel and skeletal fluorosis following prolonged high exposure. The ranges of intakes producing these opposing effects are not far apart.

Lead

Lead is a toxic metal whose widespread use has caused extensive environmental contamination and health problems in many parts of the world. It is a cumulative toxicant that affects multiple body systems, including the neurologic, hematologic, gastrointestinal, cardiovascular, and renal systems. Children are particularly vulnerable to the neurotoxic effects of lead, and even relatively low levels of exposure can cause serious and in some cases irreversible neurological damage.

Mercury

Mercury is toxic to human health, posing a particular threat to the development of the child in utero and early in life. Mercury exists in various forms: elemental (or metallic); inorganic (e.g. mercuric chloride); and organic (e.g., methyl- and ethylmercury), which all have different toxic effects, including on the nervous, digestive and immune systems, and on lungs, kidneys, skin and eyes.

Highly hazardous pesticides

Highly hazardous pesticides may have acute and/or chronic toxic effects, posing particular risk to children, and are recognized as an issue of global concern. Their widespread use has caused health problems and fatalities in many parts of the world, often as a result of occupational exposure and accidental or intentional poisonings.

Air Pollution

Air pollution kills an estimated seven million people worldwide every year. WHO data shows that 9 out of 10 people breathe air containing high levels of pollutants. WHO is working with countries to monitor air pollution and improve air quality.

From smog hanging over cities to smoke inside the home, air pollution poses a major threat to health and climate. The combined effects of ambient (outdoor) and household air pollution cause about seven million premature deaths every year, largely as a result of increased mortality from stroke, heart disease, chronic obstructive pulmonary disease, lung cancer and acute respiratory infections.

More than 80% of people living in urban areas that monitor air pollution are exposed to air quality levels that exceed WHO guideline limits, with low- and middle-income countries suffering from the highest exposures, both indoors and outdoors.

On Final Note |10 chemicals of public health concern | WHO

In conclusion, the 10 chemicals highlighted by the World Health Organization present significant public health concerns due to their potential to cause adverse health effects. From arsenic contamination in drinking water to the carcinogenic properties of benzene and the long-term health risks associated with asbestos exposure, these chemicals pose substantial challenges for global health. Addressing these challenges requires coordinated efforts from policymakers, public health practitioners, industry stakeholders, and the general public. By implementing effective regulatory measures, promoting awareness, and investing in preventive strategies, we can mitigate the risks posed by these chemicals and safeguard the health and well-being of current and future generations. Together, let us strive to create a healthier and safer environment for all.

Source: WHO | 10 chemicals of public health concern | WHO

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