ThinkRankPollution of Air and Water
Air and water pollution occur when harmful substances enter environmental systems at levels that cause damage. Sources include transport, industry, sewage, agriculture, and careless disposal. Prevention requires technology, regulation, behaviour change, monitoring, and fair access to clean resources.
Learning Objectives
- •Explain pollutants and sources
- •Explain effects spread through systems
- •Explain prevention is better
Key Concepts
Pollutants and sources
Smoke, particulate matter, harmful gases, pathogens, chemicals, plastics, and excess nutrients can enter air or water through human activities.
Effects spread through systems
Pollution can affect lungs, water organisms, food chains, soil, climate, and communities far from the original source.
Prevention is better
Cleaner fuels, treatment plants, waste segregation, emission standards, public transport, and careful farming reduce pollution at its source.
Terminology
Historical Insight
Water treatment
Settling, filtration, disinfection, and safe disposal can reduce risks, but treatment cannot excuse dumping waste.
Indoor air
Ventilation and cleaner cooking fuels can reduce exposure to smoke in homes.
Quick Check
What is a pollutant?
How can sewage contaminate water?
Name two ways to reduce air pollution.
How to use this lesson
Read the overview first, then explain the main idea in your own words before checking the key concepts. Use the quick-check questions without looking at the answer. For examination preparation, verify dates, definitions, and syllabus requirements against your official textbook and school or examination-board guidance.