Pollution and Sustainable Development

Overview

Pollution and sustainable development is a high-weightage topic in KAR TET Environmental Studies, appearing consistently in both Paper I and Paper II. This topic tests your understanding of how human activities degrade the environment and what measures can restore balance between development and ecological health.

For the exam, you must know the causes, effects and control measures of all four pollution types—air, water, soil and noise. Equally important is understanding sustainable development as a concept that links economic growth with environmental protection. Questions often connect pollution sources to local Karnataka contexts (industrial belts like Bhadravati, mining in Bellary, traffic in Bengaluru) and expect you to suggest practical solutions suitable for primary-level teaching.

Mastering this topic also supports your pedagogy answers—many EVS questions ask how to teach pollution awareness through activities, projects and local environmental observations.

Key Concepts

• **Pollution** is the introduction of harmful substances (pollutants) into the environment that cause adverse changes to air, water, soil or living organisms.

• **Air pollution** results primarily from vehicular emissions, industrial discharge, burning of fossil fuels and agricultural stubble burning; key pollutants include CO, CO₂, SO₂, NO₂, particulate matter (PM2.5, PM10) and lead.

• **Water pollution** occurs when untreated sewage, industrial effluents, agricultural runoff (fertilisers, pesticides) and plastic waste contaminate rivers, lakes and groundwater.

• **Soil pollution** arises from excessive use of chemical fertilisers and pesticides, improper waste disposal, mining activities and industrial waste dumping—reducing soil fertility and harming soil organisms.

• **Noise pollution** is unwanted sound above 80 decibels from traffic, construction, loudspeakers and industries, causing hearing loss, stress and sleep disturbance.

• **Sustainable development** means meeting the needs of the present generation without compromising the ability of future generations to meet their own needs (Brundtland Commission, 1987).

• The three pillars of sustainable development are **economic growth, social equity and environmental protection**—often called the triple bottom line (People, Planet, Profit).

• **Reduce, Reuse, Recycle (3Rs)** is the foundational principle for sustainable consumption and waste management.

Formulas / Key Facts

| Fact | Detail | |------|--------| | Safe noise level for humans | Below 80 decibels (WHO standard) | | Permissible PM2.5 (India NAAQS) | 60 µg/m³ (24-hour average) | | BOD (Biochemical Oxygen Demand) | Indicator of organic pollution in water; higher BOD = more pollution | | pH of unpolluted rainwater | Approximately 5.6 (slightly acidic due to dissolved CO₂) | | Acid rain pH | Below 5.6, caused by SO₂ and NO₂ emissions | | Brundtland Report year | 1987 — "Our Common Future" | | Earth Summit (Rio Conference) | 1992 — introduced Agenda 21 for sustainable development | | SDGs (UN Sustainable Development Goals) | 17 goals adopted in 2015, target year 2030 | | Karnataka's first pollution control board | Karnataka State Pollution Control Board (KSPCB), established 1974 | | Major polluted rivers in Karnataka | Vrishabhavathi (Bengaluru), Tungabhadra (industrial belt) |