Questions on Air Pollution
Multiple-Choice Questions: Air Pollution
1. What is air pollution?
A) Clean oxygen in the atmosphere
B) The natural cycle of wind patterns
C) The presence of harmful substances in the air
D) The formation of clouds
E) Natural volcanic eruptions only
2. Which of the following is a major source of air pollution?
A) Photosynthesis
B) Wind power
C) Vehicle emissions
D) Tidal waves
E) Plant respiration
3. Which gas is a primary greenhouse gas emitted from burning fossil fuels?
A) Oxygen
B) Nitrogen
C) Carbon dioxide (CO₂)
D) Argon
E) Hydrogen
4. What does PM2.5 refer to in air pollution studies?
A) A type of gas
B) Large dust particles
C) Fine particulate matter less than 2.5 micrometers
D) Ozone layer thickness
E) A fossil fuel
5. Which of the following is a health effect of air pollution?
A) Improved breathing
B) Lower risk of infection
C) Respiratory diseases like asthma
D) Better lung development
E) Reduced allergies
6. Smog is primarily formed by:
A) Dust and rain
B) Fog and snow
C) Smoke and fog with pollutants
D) Wind and clouds
E) Lightning and water vapor
7. Which human activity is most associated with air pollution?
A) Bird watching
B) Solar panel installation
C) Industrial emissions
D) Tree planting
E) Organic farming
8. Acid rain is caused by emissions of:
A) Water vapor and CO₂
B) Methane and argon
C) Sulfur dioxide (SO₂) and nitrogen oxides (NOx)
D) Oxygen and ozone
E) Chlorophyll and dust
9. Which layer of the atmosphere is most directly affected by air pollution?
A) Exosphere
B) Thermosphere
C) Troposphere
D) Stratosphere
E) Mesosphere
10. Which pollutant contributes to the destruction of the ozone layer?
A) CO₂
B) Water vapor
C) Methane
D) CFCs (chlorofluorocarbons)
E) O₂
11. The Air Quality Index (AQI) is used to:
A) Count clouds
B) Forecast rain
C) Measure pollen in the air
D) Measure and report daily air pollution levels
E) Analyze greenhouse gases in soil
12. Which natural event can also contribute to air pollution?
A) Rainfall
B) Earthquakes
C) Volcanic eruptions
D) Ocean tides
E) Hibernation
13. What is a secondary pollutant?
A) A pollutant formed by natural decay
B) A pollutant created by chemical reactions in the atmosphere
C) An industrial waste
D) A pollutant released only in winter
E) An odorless pollutant
14. Photochemical smog forms when pollutants react with:
A) Soil
B) Ice
C) Sunlight
D) Trees
E) Water
15. Indoor air pollution can be caused by:
A) Open windows
B) Household cleaning chemicals and poor ventilation
C) Loud music
D) Cold weather
E) Soft furniture
16. Which of the following is a renewable energy source that helps reduce air pollution?
A) Oil
B) Natural gas
C) Wind energy
D) Coal
E) Diesel
17. What does carbon monoxide (CO) do to the human body?
A) Cleans the lungs
B) Enhances oxygen transport
C) Prevents oxygen from binding to hemoglobin
D) Increases alertness
E) Strengthens immune cells
18. What international agreement aims to reduce ozone-depleting substances?
A) Kyoto Protocol
B) Paris Agreement
C) Montreal Protocol
D) Geneva Convention
E) Rio Declaration
19. Which of the following actions helps reduce air pollution?
A) Using more cars
B) Burning trash
C) Walking or biking instead of driving
D) Cutting down trees
E) Using charcoal indoors
20. What is the main environmental consequence of increased greenhouse gas emissions?
A) Decrease in volcanic activity
B) Cooling of the Earth's surface
C) Global warming and climate change
D) Reduced rainfall
E) Ozone layer repair
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Answer Key with Explanations
1. C – Air pollution is the presence of harmful substances in the atmosphere.
2. C – Cars emit pollutants like CO, NOx, and hydrocarbons.
3. C – CO₂ is a major greenhouse gas from burning fossil fuels.
4. C – PM2.5 are fine inhalable particles that harm health.
5. C – Air pollution can cause or worsen respiratory diseases.
6. C – Smog is a mix of fog and pollutants like smoke.
7. C – Industrial activities release large quantities of air pollutants.
8. C – SO₂ and NOx react with water vapor to form acid rain.
9. C – The troposphere is the lowest atmospheric layer where pollution occurs.
10. D – CFCs damage the ozone layer, allowing more UV rays to reach Earth.
11. D – AQI rates the cleanliness of air and health risks from pollution.
12. C – Volcanic eruptions release gases and ash, contributing to pollution.
13. B – Secondary pollutants form from chemical reactions, like ozone in smog.
14. C – Sunlight reacts with pollutants to form photochemical smog.
15. B – Poor ventilation and toxic household products pollute indoor air.
16. C – Wind energy is clean and does not release pollutants.
17. C – CO binds to hemoglobin, blocking oxygen transport in the body.
18. C – The Montreal Protocol targets ozone-depleting substances like CFCs.
19. C – Reducing vehicle use cuts down air emissions.
20. C – Greenhouse gases trap heat, causing global warming and climate change
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