AIR POLLUTION

AIR POLLUTION

FIRST TERM E-LEARNING NOTE

SUBJECT: BASIC SCIENCE

CLASS: JSS1

Term : First Term

Week: Week 8

Class : JSS 1

Previous lesson : The pupils have previous knowledge of  

Environmental Pollution: Water Pollution

Topic :

 

AIR POLLUTION

CONTENT

  1. Definition of Air Pollution
  2. Air Polluntants
  3. Sources of Air Pollution
  4. Consequences of Air Pollution
  5. Control Measures of Air Pollution

Behavioural objectives :

By the end of the lesson, the learners will  be able to

  • Define Air Pollution
  • Mention Air Pollutants
  • Say How to Reduce air pollution
  • Mention four air pollutants
  • List how to prevent air pollution

 

Instructional Materials :

  • Wall charts
  • Pictures
  • Related Online Video
  • Flash Cards

Methods of Teaching :

  • Class Discussion
  • Group Discussion
  • Asking Questions
  • Explanation
  • Role Modelling
  • Role Delegation

 

Reference Materials :

  • Scheme of Work
  • Online Information
  • Textbooks
  • Workbooks
  • 9 Year Basic Education Curriculum
  • Workbooks

 

 

CONTENT :

 

 

 

Definition of Air Pollution

Air pollution is the discharge of harmful waste substances which contaminate the atmosphere. Air pollutants can be solids, liquids or gases.

air pollutionAir Pollution

Air pollution is a serious problem in many parts of the world. Smokestacks pump pollution into the air, harming the environment and making it harder to breathe.

The following table shows the constituents that make up the air and their natural proportions:

Nitrogen 78%
Oxygen 21%
Argon 0.93%
Carbon dioxide 0.03%

Anything short of this is air pollution.

 

Air Pollutants

The major air pollutants are

(i) Sulphur dioxide from motor vehicles and industrial plants.

(ii) Nitrogen oxides

(iii) Carbon monoxide from exhaust pipe of cars

(iv) Hydrogen sulphide smell like rotten egg

(v) Dust from city road and surroundings.

(vi) Smoke from domestic fires, cigarettes, industrial premises, etc.

(vii) Smog produced by the action of sunlight on nitric oxide and nitrogen dioxide.

(viii) Radioactive rays from nuclear power plants and nuclear reactors.

 

Sources of Air Pollution

Sources of Air Pollution

The sources of air pollution include:

(i) Automobiles

(ii) Power stations

(iii) Industries

(iv) Burning of wood and vegetation for agricultural purposes

(v) The decay of dead plants and animals.

 

Consequences of Air Pollution

The consequences of air pollution include the following:

(i) CARBON MONOXIDE: In low concentration causes dizziness, headache, nausea and tiredness. If inhaled for a longer periods even in low concentration, causes brain damage; at a higher concentrations, it can cause unconsciousness and eventually death.

(ii) SULPHUR DIOXIDE: It causes lung diseases in human. It changes the green colour of plants leaves and corrodes metals.

(iii) NITROGEN OXIDES: This causes lung irritation, suffocation, disease in plants and corrosion of metallic objects.

(iv) CARBON MONOXIDE: It reacts with the haemoglobin in the blood preventing it from taking oxygen and forms carboxyhaemoglobin, which can lead to death by suffocation.

(v) HYDROGEN SULPHIDE: It has rotten egg smell which is irritating and can causes suffocation to humans.

(vi) Dust particles can cause injury to the eyes, noses and ears.

(vii) Smoke causes injury to the lung of the respiratory tracts and discomfort to man. Smoke from cigarette causes lung cancer, asthma and chronic bronchitis.

(viii) Smog causes eyes irritation, respiratory ailments nausea.

(ix) Radioactive rays are very dangerous to health and can destroy genes.

 

Control Measures of Air Pollution

The control measures of air pollution include the following:

(i) Proper maintenance of machinery, motor vehicles, boilers, furnaces and chimney.

(ii) Cover noses properly with white clean handkerchief if you accidentally get to air polluted area.

(iii) Planting of trees: Plants can use carbon dioxide for photosynthesis, and at the same time releasing oxygen to the atmosphere.

(iv) Government should enact laws to discourage bush burning.

(v) Rooms and kitchens should be well ventilated to prevent air pollution in the home.

(vi) Gas flaring should be discouraged to avoid release of harmful gases into the air.

 

 

 

 

Presentation

 

The topic is presented step by step

 

Step 1:

The class teacher revises the previous topics

 

Step 2.

He introduces the new topic

 

Step 3:

The class teacher corrects the pupils when and where the needs arise .

 

 

EVALUATION

  1. State five effects of air pollution.
  2. How can air pollution be controlled?
  3. Write out the Meaning of air  Pollution
  4. Mention four  Types of pollution
  5. Explain Air pollution
  6. Write out the Meaning of air  Pollution
  7. List two ways by which air pollution can be prevented prevent
  8. Write out two hazards of air pollution

Conclusion

The class teacher wraps up or conclude the lesson by giving out short note to summarize the topic that he or she has just taught.

The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.

He or she does the necessary corrections when and where  the needs arise.

 

 

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