Environmental Pollution | Class 12 Geography Notes
By ConceptScroll Team · Published on 17 July 2026 · 4 min read
Environmental Pollution – this guide gives you a concise, exam-ready overview of Environmental Pollution from Class 12 Geography, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Urban Waste Disposal
Urban waste disposal is a critical environmental issue in rapidly growing cities. Urban areas face overcrowding, congestion, inadequate infrastructure, and poor sanitation, leading to accumulation of solid waste.
Solid waste includes household garbage, industrial debris, plastics, metals, glass, ash, and electronic waste. It is generated from two main sources: domestic establishments and industrial/commercial units.
Household waste is often dumped on public lands or private contractor sites, while industrial waste is disposed of in municipal landfill areas. Improper disposal causes health hazards by producing foul smells and attracting disease vectors like flies and rodents. Diseases such as typhoid, diphtheria, diarrhoea, malaria, and cholera spread due to poor waste management.
Industrial waste dumping into rivers causes water pollution and downstream health problems.
In metropolitan cities like Mumbai, Kolkata, Chennai, and Bengaluru, about 90% of solid waste is collected and disposed of properly. However, in many other cities, 30-50% of waste remains uncollected, accumulating in streets and open spaces, causing environmental degradation.
Sustainable waste management involves treating waste as a resource for energy generation and composting. Untreated waste releases toxic biogas including methane, contributing to air pollution.
The chapter includes an activity prompting students to reflect on the nature of their waste, disposal methods, the role of ragpickers, and the value of urban waste.
📊 Diagram: Fig.9.3 shows heaps of urban solid waste dumped in Mahim area of Mumbai, illustrating the scale of urban waste problem.
🧪 Activity: Activity: Students are asked to analyze what they throw away, where waste ends up, why ragpickers sort rubbish, and the value of urban waste.
🔗 Connection: Leads to the section on Rural-Urban Migration, discussing population movement affecting urban pollution.
Frequently asked questions
What do we throw away? Why? Where does our waste end up? Why do ragpickers sort out rubbish dumps? Does it have some value? Is our urban waste worth anything?
1. What do we throw away? Why? We throw away various types of waste such as food scraps, plastic, paper, metal, glass, and other discarded materials because they are no longer useful or wanted.
2. Where does our waste end up? Waste typically ends up in landfills, dumpsites, or is sometimes incinerated. Some waste is recycled or composted.
3. Why do ragpickers sort out rubbish dumps? Does it have some value? Ragpickers sort rubbish dumps to collect recyclable or reusable materials like plastic,
Why are the children of slum-dwellers deprived of school education?
Children of slum-dwellers are deprived of school education primarily due to poverty and poor living conditions. Most slum populations work in low-paid, high risk-prone, unorganised sectors of the urban economy, which leads to undernourishment and inability to afford proper education for their children. Additionally, the overcrowded and unhygienic environment, lack of basic amenities, and social exclusion contribute to limited access and opportunities for education.
Choose the right answers of the following from the given options. (i) Which one of the following river is highly polluted? (a) Brahmaputra (b) Satluj (c) Yamuna (d) Godavari (ii) Which one of the following deseases is caused by water pollution? (a) Conjunctivitis (b) Diarrhorea (c) Respiratory infections (d) Bronchitis (iii) Which one of the following is the cause of acid rain? (a) Water pollution (b) Land pollution (c) Noise pollution (d) Air pollution (iv) Push and pull factors are responsible for- (a) Migration (b) Land degradation (c) Slums (d) Air pollution
(i) The Yamuna river is highly polluted due to discharge of untreated sewage and industrial effluents from urban areas.
(ii) Diarrhoea is caused by water pollution as contaminated water carries pathogens causing gastrointestinal diseases.
(iii) Acid rain is caused by air pollution, specifically by sulfur dioxide and nitrogen oxides released from burning fossil fuels.
(iv) Push and pull factors are responsible for migration, as they drive people to leave or attract them to move to new areas.
Answer the following questions in about 30 words. (i) What is the difference between pollution and pollutants? (ii) Describe the major source of air pollution. (iii) Mention major problems associated with urban waste disposal in India. (iv) What are the effects of air pollution on human health.
(i) Pollution is the introduction of harmful substances into the environment, whereas pollutants are the substances that cause pollution.
(ii) Major sources of air pollution include industrial emissions, vehicular exhaust, burning of fossil fuels, and biomass burning.
(iii) Major problems with urban waste disposal in India include lack of proper segregation, inadequate infrastructure, open dumping, and health hazards.
(iv) Effects of air pollution on human health include respiratory diseases,
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Clear NCERT-aligned notes on computer hardware and the application software are referred as the Database for Class 12 Geography.
- computer hardware and the application software are referred as the Database | Class 12 Geography Notes
Clear NCERT-aligned notes on computer hardware and the application software are referred as the Database for Class 12 Geography.
- computer hardware and the application software are referred as the Database | Class 12 Geography Notes
Clear NCERT-aligned notes on computer hardware and the application software are referred as the Database for Class 12 Geography.