Britannica
Sources used in this answer
Why did the U.S. Environmental Protection Agency restrict DDT use in 1972?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
organohalogen compound
Vinyl chloride is an organohalogen compound that has important industrial applications. When treated with certain catalysts, vinyl chloride monomers undergo polymerization and form the larger compound known as polyvinyl chloride, or PVC. PVC is used in the manufacture of numerous products, including packaging films and water pipes.
The U.S. Environmental Protection Agency (EPA) restricted the use of DDT in 1972 primarily due to growing evidence of its detrimental impact on the environment and human health.12
Key factors driving this decision included:
- Environmental Persistence and Bioaccumulation: As an organohalogen compound, DDT is highly stable and does not break down easily in the environment. It dissolves in fats, causing it to accumulate in the tissues of living organisms and concentrate as it moves up the food chain.12
- Impact on Wildlife: High levels of DDT were linked to reproductive abnormalities in animals, most notably causing eggshell thinning in birds, which led to significant population declines in species such as eagles, hawks, and falcons.12
- Human Health Concerns: Research, highlighted by Rachel Carson in her influential book Silent Spring, identified DDT as a potential carcinogen.3
- Insect Resistance: Over decades of widespread use, many insect species evolved resistance to the insecticide, reducing its long-term effectiveness.12