Daily Hot Topic
Topic : Persistent Organic Pollutants (POPs)
GS-3 Mains : Environmental Pollution
Revision Notes
Context
- A new study (2024?) found a decline in Dichloro-diphenyl-trichloroethane (DDT) and 11 other POPs in humans and the environment since 2004, likely due to global regulations.
Findings
- POPs were detected in over 900 samples collected from various sources (air, water, human milk, soil, meat, dairy, eggs, fish, oil, etc.).
- Levels of 12 POPs, including DDT, have decreased globally, likely due to regulations implemented since 2004.
- Other POPs, like dieldrin and PCBs (regulated for a long time), are still present at high levels in Africa, the Caribbean, and Latin America.
What are POPs?
- POPs are organic (carbon-based) chemical substances.
- They resist degradation through chemical, biological, and photolytic processes.
Key Characteristics of POPs
- Persistence: POPs can last for years or decades in the environment without breaking down.
- Bioaccumulation: POPs accumulate in the fatty tissues of living organisms as they move up the food chain, leading to higher concentrations in humans.
- Long-range transport: POPs can travel long distances from their source through air and water currents.
- Toxicity: Many POPs are harmful to humans and wildlife, causing cancer, reproductive problems, immune system disruption, and neurological effects.
Examples of POPs
- Pesticides (e.g., DDT)
- Industrial chemicals (e.g., PCBs)
- Unintentional by-products of industrial processes (e.g., dioxins and furans)
Sources of POP Pollution
- Improper use and disposal of agrochemicals and industrial chemicals
- Elevated temperatures and combustion processes
- Unwanted by-products of industrial processes or combustion
Regulation of POPs
- Stockholm Convention (2004): Aims to reduce global POPs releases.
- Rotterdam Convention (2004): Promotes shared responsibility for safe import and use of hazardous chemicals.
- Basel Convention (1992): Protects human health and the environment from hazardous waste.
- LRTAP Convention & POPs Protocol (2003): Aims to limit and reduce air pollution, including POPs.