Pesticides are chemicals used to kill or limit the growth of numerous types of pests. Included in this grouping are herbicides (kill plants), fungicides (kill fungi), insecticides (kill insects) and numerous other classes. They are designed to disrupt biological systems.
Pesticides are used extensively in farming and are also used in homes, schools and businesses. Ten of the twelve most dangerous organic chemicals are pesticides.
Pesticides have been used to control mosquitoes to reduce the spread of diseases such as malaria and yellow fever. However, approaches to the treatment of mosquitoes and other health threats often have included excessive and injudicious use of pesticides rather than appropriate vector control.
There are more than 17,000 pesticide products on the market. Many of those are approved through “conditional registration”—a regulatory loophole that allows products on the market quickly without thorough review.
Sources of Pesticide Exposure
In addition to the widespread use of pesticides on agricultural lands, parks, schools and commercial and residential properties, pesticides are also found in household cleaners, hand soaps and swimming pools.
Individuals may be exposed to pesticides through both direct and indirect routes. Direct exposure occurs to individuals who personally apply pesticides in agricultural, occupational, or residential settings and is likely to result in the highest levels of exposure, whereas indirect exposures occur through drinking water, air, dust, and food and represent routes of long-term, generally low-level exposures. Indirect exposures may occur more frequently than direct pesticide application.
Health Effects
Pesticide exposure has been linked to numerous health effects including non-Hodgkin’s lymphoma, Parkinson’s disease, autism, leukemia, fetal death, birth defects, neurodevelopmental disorders and cancer.
Pesticide poisoning is another significant health issue caused by exposure to pesticides. Symptoms include nausea, vomiting, headaches, rashes, eye irritation, fatigue, weakness, cramps, tremors, seizures and death. As stated by the World Health Organization:
Cases of acute pesticide poisoning (APP) account for significant morbidity and mortality worldwide. Developing countries are particularly susceptible due to poorer regulation, lack of surveillance systems, less enforcement, lack of training and inadequate access to information systems.
Many individuals and workers who experience health effects from APP may never present to a health-care provider due to distance from a medical facility, lack of resources, economic factors, fear of job loss or other reasons. Some health-care providers may be unaware of the relationship between pesticide and illnesses and fail to diagnose or report the incident properly. Additionally, some pesticides may not be properly mixed, prepared, applied, labelled or registered, making the determination of the agent of exposure difficult.
It is important to note that although some pesticides have been banned or restricted, they are still being used---either illegally or through the “Critical Use Exemption.” For example, the U.S. EPA offers a Critical Use Exemption for methyl bromide (another type of pesticide) when users have no technically and economically feasible alternatives and where the lack of methyl bromide will result in a significant market disruption.
Other countries have banned or restricted many types of pesticides. However, the United States still allows
the use of these five---neonicotinoids, paraquat, 1,3-Dichloropropene, glyphosate and atrazine.