Students’ Learning Outcomes
· Explain the sources, properties and harmful effects of air pollutants.
Information for Teachers
· Pollution is a process through which harmful substances are added to the environment and these harmful substances are called pollutants. Presence of these substances in air is called air pollution.
· Air pollution is mainly caused by dust, sulfur dioxide, carbon dioxide, nitrogen oxide, hydrocarbons and ozone.
· The air pollutants added into the air may be due to human activities (e.g. Burning of fossil fuels, exhaust fumes from motor vehicles and burning of garbage.) and natural occurrences (e.g. biological decay, forest fires or volcanic eruptions)
· Air pollution damages or defiles the environment, making it undesirable or unfit for life.
· Pollution sound effects are indeed various and wide-ranging.
· There is no doubt that extreme stages of pollution are causing a lot of harm to human & animal health, tropical rain forests, as well as the broader environment.
Material / Resources
Board, chalk/marker, chart, colored cards, scissors, white sheets, gum
Worm up activity
· Brainstorm the students by asking the following questions:
o What do you mean by pollution?
o Do you know about the different types of pollution?
o What are the causes of pollution?
o What are the effects of pollution on our health and environment?
· Draw the diagram on the board as shown below and ask the students about the air pollutants, its causes, and effects on the environment and health.
· Draw this figure or paste already drawn figure on a board showing an important source of air pollution and ask questions from the students.
· Write these questions on the board and complete it by the students.
· X’ is a gaseous pollutant that gives rise to ‘y’. identify ‘x’ and ‘y’
A. Carbon dioxide Hailstones
B. Carbon monoxide Acid rain
C. Chloroflouro carbon Thunderstorm
D. Sulfur dioxide Acid rain
· How ‘y’ does affect the forests in long term?
A. It reduces its rate of transpiration.
B. It kills the trees.
C. It reduces its photosynthesis.
Sum up / Conclusion
· Ask the students following questions
o define pollution,
(Expected response will be: Pollution is a process through which harmful substances are added to the environment.)
o What are pollutants?
(Expected response will be: Harmful substances are added to the environment by pollution.)
o What are the major causes and effects of air pollution?
(Expected response will be: Air pollution is mainly caused by dust, sulfur dioxide, carbon dioxide, carbon monoxide, nitrogen oxide, hydrocarbons and ozone. it may also be due to human activities (e.g. burning of fossil fuels, exhaust fumes from motor vehicles, and burning of garbage.) and natural occurrences (e.g. biological decay, forest fires or volcanic eruptions). Air pollution damages or defies the environment, making it undesirable or unfit for life.
· Ask the students to solve the following question:
· Write the following question on the board and ask them to copy and solve as homework on their notebooks:
· Since sulfur dioxide is the major pollutant because of human activities, what suggestions would you give to reduce its release into the atmosphere?
· What can you do to prevent the further thinning of the ozone layer?