The Role of Harmful Chemicals on Environment and Human Health: A Review

Abstract

The three essentials for sustaining life air, water, and food form the foundation of our environment, yet all three are increasingly being polluted or adulterated. Human activities have introduced a vast array of chemical substances into the environment, a trend that has been ongoing for centuries. However, what differentiates the present from the past is the exponential increase in population relative to the environment’s capacity to absorb and balance these pressures. As a result, both the physical and chemical composition of the environment are undergoing significant changes. These chemicals, primarily originating from industrial discharges, agricultural processes, pesticides, insecticides, and synthetic structural materials, include both beneficial and harmful agents. While some chemicals serve essential purposes, many others are toxic, threatening ecosystems as well as human health. Human interventions thus have a cascading impact on interconnected ecological systems. Employing safer, environmentally compatible chemicals can reduce risks not only to nature but also to human well-being. Harmful chemicals are often termed life-threatening agents because of their intrinsic properties such as ignitability, toxicity, corrosivity, oxidative potential and ecotoxicity. These may be present in flammable liquids, gases, solids, explosives, or even infectious and radioactive substances. Their presence in the environment is linked to a wide range of health issues, including both acute and chronic conditions affecting the skin, eyes, and vital organs, as well as impairing specific physiological functions. Nevertheless, rigorous health surveillance, exposure monitoring and risk assessment practices can mitigate these hazards. This challenge is not confined to developing nations alone; even in highly industrialized countries, remedial solutions often emerge only after significant damage has already occurred, when the urgency for preventive safeguards has diminished. The association between environmental toxins and human health is still not fully understood, largely due to the difficulty of accurately quantifying long-term exposure and the lack of systematic monitoring mechanisms. Different pollutants contribute to both chronic and acute disorders, underscoring the pressing need for deeper investigation.