Air Pollution MCQs with Answers and Explanations

Practice the most important Air Pollution multiple choice questions for UPSC, SSC, UGC NET, State PSC and environmental science exams.

About Air Pollution MCQs

Air Pollution is an important topic in Environmental Science and General Knowledge examinations. Questions related to pollutants, Air Quality Index (AQI), greenhouse gases, ozone depletion, smog, and control measures frequently appear in UPSC, SSC, Railway, UGC NET, State PSC, and teaching eligibility tests.

The following Air Pollution MCQs with answers and explanations will help candidates improve conceptual understanding and prepare effectively for competitive examinations.

Questions
1 What is the residence time (average time a particle is active in a given system) of carbon monoxide?
A 11-15 years
B 0.1-0.3 years
C 0.5 years
D Few minutes

Answer: 0.1-0.3 years
2 What type of precautions will be taken to survive when ozone level is high?
A Drive less
B Stay hydrated
C Avoid using gas powered engines
D All of the above

Answer: All of the above
3 Secondary air pollutant is
A Ozone
B Carbon monoxide
C Nitrogen Dioxide
D Sulphur dioxide

Answer: Ozone
4 SMOG is derived from
A Smoke
B Fog
C Both A and B
D Only A

Answer: Both A and B
5 Proportion of CO consumption consists of basic components:
A The leaf boundary layer
B The stomata
C Radiation exchange
D All of Above

Answer: All of Above
6 What is Air Quality Index?
A It tells about the sound pollution
B It measures air pollution mainly sulphur content in the air
C It measures ozone levels in your area
D It checks the colour of the air

Answer: AQI indicates overall air quality based on multiple pollutants including PM2.5, PM10, SO₂, NO₂, CO, O₃, NH₃, and Pb.
7 Which of the following is an organic gas?
A Hydrocarbons
B Aldehydes
C Ketones
D Ammonia

Answer: Hydrocarbons
8 Which of the following leads to a disease called Bronchospasm?
A SO2
B SO3
C SO4
D CO2

Answer: SO3
9 Which of the following gases has the highest affinity for blood haemoglobin?
A Carbon dioxide
B Oxygen
C Carbon monoxide
D Nitrogen

Answer: Carbon monoxide
10 Which is/are the most significant air-borne allergen(s)?
A Fungi
B Pollen
C Soot
D All of the mentioned

Answer: Pollen
11 Which of the following is responsible for turning yellow Taj Mahal?
A Nitrogen dioxide
B Sulphur
C Chlorine
D Sulphur dioxide

Answer: Sulphur dioxide
12 The boiler flue gas is source of
A HCl
B NO
C HF
D Volatile organic compounds

Answer: NO
13 The threshold concentration of sulphur dioxide in any industrial activity should not be permitted beyond
A 2ppm
B 3ppm
C 4ppm
D 5ppm

Answer: 5ppm
14 Ozone is formed in the upper atmosphere by a photochemical reaction with
A Ultra violet solar radiation
B Infra red radiation
C Visible light
D All of the above

Answer: Ultra violet solar radiation
15 The major contributor of Carbon monoxide is
A Motor vehicle
B Industrial processes
C Stationary fuel combustion
D None of the above

Answer: Motor vehicle
16 The maximum size of fly ash is
A 1μm
B 100μm
C 1000μm
D 10μm

Answer: 1000μm
17 Which gas is mainly produced due to incomplete burning of wood?
A CO
B SO2
C NO2
D NO3

Answer: CO
18 At what concentration can the taste and smell of sulphur dioxide be detected?
A 1000-2000ppm
B 11-30ppm
C 500-700ppm
D 0.1-0.3ppm

Answer: 0.1-0.3ppm
19 Which of the following are sources to fluorine air pollution?
A Coal combustion
B Steel industries
C Phosphate fertiliser manufacturing
D All of the mentioned

Answer: All of the mentioned
20 Which is the largest source for production of nitrous oxide?
A Chemical industry
B Fertiliser industry
C Fossil fuel combustion
D Bacterial action

Answer: Bacterial action
8000 static gk mcqs