1. What is air pollution?
(A) Formation of clouds
(B) Increase in oxygen levels only
(C) Presence of harmful substances in the air
(D) Movement of wind
2. Which organization provides international guidelines on air quality?
(A) FIFA
(B) World Health Organization (WHO)
(C) UNESCO
(D) IMF
3. Which of the following is a primary air pollutant?
(A) Carbon monoxide (CO)
(B) Ozone (O₃) formed in the atmosphere
(C) Acid rain
(D) Smog
4. Which gas is mainly produced by incomplete combustion of fuel?
(A) Nitrogen (N₂)
(B) Oxygen (O₂)
(C) Carbon monoxide (CO)
(D) Helium (He)
5. The largest source of urban air pollution is:
(A) Schools
(B) Libraries
(C) Motor vehicle emissions
(D) Parks
6. Which pollutant is mainly responsible for acid rain?
(A) Nitrogen
(B) Oxygen
(C) Sulfur dioxide (SO₂)
(D) Hydrogen
7. Nitrogen oxides (NOₓ) are mainly released from:
(A) Trees
(B) Vehicles and industries
(C) Rivers
(D) Oceans
8. Which gas is considered a greenhouse gas?
(A) Argon (Ar)
(B) Oxygen (O₂)
(C) Nitrogen (N₂)
(D) Carbon dioxide (CO₂)
9. Which air pollutant is most harmful due to its ability to penetrate deep into the lungs?
(A) Oxygen
(B) PM2.5
(C) Water vapor
(D) Nitrogen
10. PM2.5 refers to particulate matter with a diameter of:
(A) 25 millimeters
(B) 2.5 micrometers or less
(C) 250 micrometers
(D) 2.5 centimeters
11. Which pollutant is commonly associated with photochemical smog?
(A) Ozone (O₃)
(B) Nitrogen gas
(C) Helium
(D) Hydrogen
12. Smog is commonly formed by the reaction of sunlight with:
(A) Nitrogen oxides and volatile organic compounds
(B) Oxygen and hydrogen
(C) Water vapor only
(D) Carbon dioxide only
13. Indoor air pollution in developing countries is mainly caused by:
(A) LED lights
(B) Air conditioners
(C) Electric fans
(D) Biomass fuel burning
14. Which disease is commonly associated with long-term air pollution exposure?
(A) Chronic obstructive pulmonary disease (COPD)
(B) Appendicitis
(C) Malaria
(D) Typhoid
15. Air pollution can worsen:
(A) Asthma
(B) Diabetes only
(C) Fractures
(D) Cataracts only
16. Which group is most vulnerable to air pollution?
(A) Office workers only
(B) Healthy young adults only
(C) Athletes only
(D) Children and older adults
17. Which pollutant reduces the oxygen-carrying capacity of blood?
(A) Carbon dioxide (CO₂)
(B) Carbon monoxide (CO)
(C) Oxygen (O₂)
(D) Ozone (O₃)
18. Which environmental issue is mainly linked to increased greenhouse gases?
(A) Earthquakes
(B) Global warming
(C) Flood irrigation
(D) Soil erosion only
19. Which gas contributes most to ozone layer depletion?
(A) Chlorofluorocarbons (CFCs)
(B) Oxygen
(C) Nitrogen
(D) Methane
20. The ozone layer protects Earth from:
(A) Radio waves
(B) Ultraviolet (UV) radiation
(C) Infrared radiation only
(D) Sound waves
21. Which activity helps reduce air pollution?
(A) Open burning of waste
(B) Planting trees
(C) Burning coal unnecessarily
(D) Deforestation
22. Which fuel burns more cleanly than coal?
(A) Coal
(B) Wood
(C) Natural gas
(D) Crop residues
23. Which is a common source of sulfur dioxide emissions?
(A) Coal-fired power plants
(B) Solar panels
(C) Wind turbines
(D) Hydroelectric plants
24. Which air pollutant is odorless, colorless, and highly poisonous?
(A) Nitrogen
(B) Oxygen
(C) Carbon monoxide
(D) Water vapor
25. Which of the following is a secondary air pollutant?
(A) Nitric oxide
(B) Carbon monoxide
(C) Sulfur dioxide
(D) Ozone (O₃)
26. Which environmental condition traps pollutants close to the ground?
(A) Heavy rainfall
(B) Temperature inversion
(C) High humidity only
(D) Strong winds only
27. Which occupation has a higher risk of exposure to air pollution?
(A) Traffic police officer
(B) Librarian
(C) Accountant
(D) Teacher only
28. Which pollutant is commonly released from cigarette smoke?
(A) Helium
(B) Oxygen
(C) Nitrogen only
(D) Carbon monoxide
29. Passive smoking refers to:
(A) Quitting smoking completely
(B) Smoking one cigarette daily
(C) Using smokeless tobacco
(D) Inhaling smoke from other people's cigarettes
30. Which indoor practice reduces air pollution?
(A) Smoking indoors
(B) Proper ventilation
(C) Burning waste inside the house
(D) Blocking windows
31. Which disease is strongly associated with exposure to asbestos dust?
(A) Malaria
(B) Cholera
(C) Typhoid
(D) Asbestosis
32. Long-term exposure to silica dust may cause:
(A) Hepatitis
(B) Asthma only
(C) Silicosis
(D) Diabetes
33. Which pollutant is produced from burning fossil fuels and contributes to climate change?
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Carbon dioxide
34. Which of the following is a natural source of air pollution?
(A) Power plants
(B) Motor vehicles
(C) Factories
(D) Volcanic eruptions
35. Which human activity significantly increases particulate matter in the air?
(A) Rainwater harvesting
(B) Tree plantation
(C) Recycling
(D) Open burning of waste
36. Which pollutant is commonly monitored in Air Quality Index (AQI)?
(A) Sodium
(B) PM2.5
(C) Calcium
(D) Potassium
37. The Air Quality Index (AQI) is used to:
(A) Report daily air quality levels
(B) Measure rainfall
(C) Calculate population growth
(D) Monitor water quality
38. Which measure helps reduce vehicle-related air pollution?
(A) Idling engines unnecessarily
(B) Increasing private vehicle use
(C) Using public transportation
(D) Burning fuel inefficiently
39. Which pollutant is mainly responsible for respiratory irritation?
(A) Helium
(B) Oxygen
(C) Nitrogen
(D) Ozone (O₃)
40. Air pollution is a major risk factor for:
(A) Broken bones
(B) Cardiovascular diseases
(C) Appendicitis
(D) Kidney stones only
41. Which gas contributes to the greenhouse effect and is released by livestock?
(A) Oxygen
(B) Methane (CH₄)
(C) Nitrogen
(D) Helium
42. Which weather condition generally helps disperse air pollutants?
(A) Fog only
(B) Temperature inversion
(C) Calm air
(D) Strong winds
43. Which preventive measure can reduce exposure during high air pollution days?
(A) Keeping windows open near heavy traffic
(B) Exercising beside busy roads
(C) Burning household waste
(D) Wearing a well-fitted mask and limiting outdoor activities
44. Which source contributes significantly to indoor air pollution from tobacco?
(A) Electric lighting
(B) Cigarette smoking
(C) Ceiling fans
(D) Refrigerators
45. Which type of pollution is caused by emissions from factories?
(A) Industrial air pollution
(B) Marine pollution
(C) Noise pollution only
(D) Water pollution only
46. Which Sustainable Development Goal (SDG) is closely linked to reducing air pollution?
(A) SDG 3 – Good Health and Well-being
(B) SDG 2 – Zero Hunger
(C) SDG 5 – Gender Equality
(D) SDG 15 – Life on Land
47. Which pollutant is a major component of vehicle exhaust?
(A) Magnesium
(B) Calcium
(C) Nitrogen oxides (NOₓ)
(D) Potassium
48. Air pollution primarily enters the human body through the:
(A) Skeletal system
(B) Digestive system
(C) Urinary system
(D) Respiratory system
49. The best long-term strategy to reduce air pollution is:
(A) Use of clean and renewable energy sources
(B) Increased burning of coal
(C) Open burning of garbage
(D) Increased use of fossil fuels
50. The ultimate goal of air pollution control is to:
(A) Stop all transportation
(B) Eliminate all industries
(C) Protect human health and the environment by maintaining clean air quality
(D) Increase fuel consumption