Lesson 3. Environmental Pollution and Waste Management
This topic tests applied knowledge of chemical and biological principles to real-world environmental challenges. It requires detailed study of air pollution: criteria pollutants (PM2.5, PM10, SOx, NOx, Ozone), their sources, and health impacts; concepts like smog (classical and photochemical) and the formation of secondary pollutants. Water pollution covers point and non-point sources, pollutants like heavy metals, nutrients (eutrophication), and pathogens, along with key parameters like Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD). Soil pollution from pesticides, heavy metals, and salinization is also relevant. A major contemporary focus is waste management: the rules and challenges associated with solid waste (plastic waste management rules, e-waste rules, construction & demolition waste), biomedical waste, and hazardous waste. Understanding technological and policy solutions—bioremediation, phytoremediation, waste-to-energy, and the concept of a circular economy—is essential.
Additional Resources: CPCB (Central Pollution Control Board) and SPCB websites provide data on air quality indices, pollutant standards, and reports on waste generation. The “Parivesh” portal by MoEFCC offers a repository of environmental clearances and regulations. For global context, UNEP reports on plastics pollution and Global E-waste Monitor are excellent references.