Chemical Pesticides’ Adverse Effects on the Environment and Human Health


Pesticides are chemical compositions that have saved millions of human and animal lives since their use. They are employed to eradicate fungal, animal, and insect pests that damage crops and carry vector-borne diseases. Pesticides have played a vital role in the revolution of the agriculture industry, increasing food production, saving time and energy, and reducing costs.

 Although pesticides provide substantial benefits, they significantly damage the natural environment and human health. Nearly 95% of pesticides are used in farms and reach other organisms apart from the targeted pests. Some factors like a breeze, humidity, and temperature contribute to the spread of pesticides in the air and water. More than 26 million people suffer from pesticide poisoning each year.

Pesticides are involved in a wide range of organic micropollutants. They have two specific mechanisms of contamination with negative consequences, which are biomagnification and bioconcentration.

  • Biomagnification

Biomagnification or biological magnification refers to a process within the food chain. The living organisms that have tolerance regarding a certain toxin within their system get eaten by living organisms higher in the food chain.  The level of the chemicals within the living organisms would rise gradually leading to disease, impairment, and in extreme cases death.

  • Bioconcentration

The main receptor for many insecticides like DDT is fat tissue. Therefore, these pesticides accumulate in fat. They are “lipophilic” and transmit into an organism from the surrounding medium. They are fat-soluble in human adipose tissues when consuming contaminated edible fish.


Metabolism Process of Pesticides, Their Degradation in Water and Soil

Two major biological mechanisms cause pesticides degradation:

1- Microbiological reactions in water and soil

2- Pesticide metabolism within organisms consumed as part of their absorption of food

The degradation process in soil called mineralization includes chemical reactions such as photolysis and hydrolysis which breaks pesticides down into smaller compounds such as NH3, H2O, and CO2. Some chemicals, for example [2,4-dichlorophenoxyacetic acid], degrade fairly quickly in the soil, while others degrade less easily [2,4,5-trichlorophenoxyacetic acid]. Other chemical compounds are very persistent and do not degrade gradually like atrazine.

UV photolysis, microbial degradation, hydrolysis, or chemical oxidation are the way of pesticide degradation in water. There are some treatments to reduce pesticide contamination such as activated carbon absorption techniques, chlorine, UV photolysis, and ozone treatment.

Fatal Effects of Pesticides on the Environment

Pesticides have a great number of disadvantages that can affect our lives in many ways. The most threatening effects of pesticides on the environment go as follows:

Aquatic Creatures

Water surfaces are contaminated by pesticides due to different factors like wind or temperature. When they reach bodies of water, they are absorbed or ingested by aquatic creatures like fish which lead to organ failure, disease, and eventually death. Moreover, these chemicals alter the water’s pH levels, so the normal function of aquatic life gets interfered with. Chemical pollutants reduce the amount of oxygen in the water which can result in mental and behavioral alterations in the fish populace or suffocate them.

Ozone Layer

Chemicals in pesticides contribute to the production of tropospheric ozone as the farmers do not utilize a shield zone around the crops. When pesticides are sprayed on fields to disinfect soil get absorbed in the air and soil produces volatile organic compounds that tend to react with other chemicals and create a pollutant known as tropospheric ozone.


Pesticides applied in the form of powder can spread in the air and reach other regions. The more the wind blows, the more these chemicals spread. They can also stick to dust particles in the air and get inhaled which can cause poisoning or disease.

Micro-Organisms in the Soil

Microorganisms have a vital role in breaking down organic substances and helping better crop growth. Pesticides percolate into the soil in the long run and lead to the termination of micro-organisms. It takes a lot of years for microorganisms to be able to live in that soil once more.


Fatal Effects on Human Health

As mentioned earlier, pesticides tend to preside in the environment. They are found in the air, water, or even our foods. They can result in serious inevitable consequences through consumption, breathing, or contact with the skin.

– Acute Health Effects

Pesticides can cause short-term adverse effects on human health that can be acute or lead to immediate health issues like:

  • Coughing, sore throat, and irritation in the respiratory tract.
  • Sensitiveness
  • Irritation of the eyes and skin.
  • Feelings of nausea, queasiness, and diarrhea
  • Losing consciousness and headaches
  • Feeling extremely weak, convulsions and/or demise
  • skin burning, stinging, and itching
  • rashes and blisters

– Chronic Health Effects

Pesticides can also cause long-term adverse health issues that can even become chronic in nature, and these may not show any observable symptoms for weeks, months, or even years after exposure:

  • cancer and other tumors
  • nervous system damage
  • infertility and other reproductive problems
  • damage to the liver, kidneys, lungs, and other body organs
  • leukemia, lymphoma, and cancers of the brain, breasts, prostate, testes, and ovaries birth defects, stillbirth, spontaneous abortion, sterility, and infertility
  • Parkinson’s ailment
  • depression and anxiety

Health Effects of Certain Classes of Pesticides

Pesticides are divided into different classes, which affect pose negative effects on humans. Here are the health effects of certain classes of pesticides:

Organophosphates & Carbamates

These pesticides attack the brain and nervous system and interfere with nerve signal transmission. If you are attacked by these insects, you may experience the following symptoms:

  • Headache
  • Nausea
  • Dizziness
  • Vomiting
  • Chest pain
  • Diarrhea
  • Muscle pain
  • Confusion
  • Difficulty breathing
  • Involuntary urination


Soil Fumigants

Soil fumigants are a kind of pesticide that protects crops against fungi and insects, but like any other pesticide, they may have some disadvantages. Fumigant exposure cause Skin, eyes, and lung irritation. This kind of pesticide includes cancer-related chemicals like dichloropropene, metam sodium and metam potassium.


These insecticides are created to be more persistent, and they are similar to botanical compounds. Pyrethroids may cause tremors, salivation, headache, fatigue, vomiting, itching skin, and involuntary twitching.

Last Word

Taking all these points into account, pesticides are chemical compositions that have negative effects on both humans and animals. Having comprehensive information bout pesticide side effects can help you prevent unavoidable consequences. In this article, we tried to provide you with practical information regarding the side effects of chemical pesticides. You can use this article as a guide for everything you need to know about the negative points of different pesticides.

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