Introduction to Environmental Pollution
Unit 3 is the most pharmacologically relevant unit in Environmental Sciences. It covers all major pollution types – their sources, harmful effects on human health, and control measures. Pharmaceutical manufacturing is itself a significant source of water and air pollution, making this knowledge essential for a responsible pharmacist.
Syllabus & Topics
- 1Pollution: Definition, causes, effects, and control measures (overview).
- 2Air Pollution: Causes (vehicular, industrial emissions), effects (COPD, lung cancer, acid rain), control (catalytic converters, filters).
- 3Major air pollutants: CO, SOx, NOx, SPM (particulate matter).
- 4Greenhouse effect, Global Warming and Climate Change.
- 5Acid Rain: Formation (SO2 + H2O), pH effects, damage to buildings and ecosystems.
- 6Ozone Layer Depletion: Role of CFCs (Freons), effects of UV-B radiation.
- 7Water Pollution: Sources (industrial effluents, agricultural runoff, sewage) and effects.
- 8BOD (Biological Oxygen Demand) and COD (Chemical Oxygen Demand): Significance as pollution indicators.
- 9Sewage Treatment: Primary, Secondary, and Tertiary treatment levels.
- 10Soil Pollution: Causes (pesticides, heavy metals, industrial waste) and remediation (bioremediation).
- 11Noise Pollution: Sources, effects (hearing loss, stress, hypertension), control measures.
- 12Thermal Pollution: Definition, sources (power plant cooling water), effects on aquatic life.
- 13Nuclear Hazards / Radioactive Pollution: Sources, effects on health (radiation sickness, cancer, mutations).
- 14Eutrophication: Nutrient enrichment of water bodies, algal bloom, dead zones.
- 15Solid Waste Management: Types (Municipal, Hospital, Industrial waste), methods of disposal.
Learning Objectives
Frequently Asked Questions (FAQs)
Q1. What is the Greenhouse Effect?
The Greenhouse Effect is a natural process in which greenhouse gases (CO₂, CH₄, N₂O, and H₂O vapor) trap infrared radiation re-emitted from the Earth’s surface, thereby warming the planet. Increased greenhouse gas emissions due to human activities enhance this effect, leading to global warming.
Q2. What causes Acid Rain?
Acid rain is caused by the combustion of fossil fuels, which releases SO₂ (sulfur dioxide) and NOₓ (nitrogen oxides) into the atmosphere. These react with atmospheric moisture to form H₂SO₄ (sulfuric acid) and HNO₃ (nitric acid). The resulting precipitation has a pH less than 5.6, damaging forests, aquatic ecosystems, soil, and buildings.
Q3. What is BOD?
Biological Oxygen Demand (BOD) is the amount of dissolved oxygen required by microorganisms to decompose organic matter in water. High BOD indicates high organic pollution, which can lead to oxygen depletion and the death of aquatic organisms.
Q4. What is Eutrophication?
Eutrophication is the excessive enrichment of a water body with nutrients, particularly nitrogen and phosphorus (often from agricultural runoff and sewage). This causes rapid algal blooms that block sunlight and deplete oxygen, resulting in aquatic “dead zones.”
Q5. What are the health effects of Noise Pollution?
Chronic exposure to noise levels above 85 dB can cause Noise-Induced Hearing Loss (NIHL). Non-auditory effects include hypertension, increased heart rate, sleep disturbances, reduced concentration, and psychological stress.