Which interpretation of an AQI value of 200 is most appropriate?

It is an index value communicating air quality, not a direct PM2.5 concentration.

It means PM2.5 concentration is necessarily 200 micrograms per cubic metre.

It gives the percentage contribution of traffic to pollution.

It is the simple average of all measured pollutant concentrations.

Assertion: Improved air quality immediately after a campaign does not by itself establish that the campaign caused the improvement. Reason: Wind, rainfall and atmospheric mixing can alter pollutant concentrations. Select the correct answer.

Both are correct, and the Reason explains the Assertion.

Both are correct, but the Reason does not explain the Assertion.

The Assertion is correct, but the Reason is incorrect.

The Assertion is incorrect, but the Reason is correct.

Which interpretation of the Green Diwali awareness campaign is consistent with the article?

It encourages voluntary choices but does not itself establish a nationwide legal ban.

Its announcement alone establishes a nationwide enforceable ban.

It removes the need for municipal waste collection.

It makes year-round source-specific pollution control unnecessary.

Which function is assigned to the PRANA portal in the article?

Monitoring NCAP implementation, including physical and financial progress

Determining the overall AQI from pollutant sub-indices

Calculating every pollution source’s share from a daily AQI value

Converting a voluntary pledge into a nationwide legal prohibition

A municipality reports that all funds for dust-control equipment have been spent. Which conclusion is most justified?

Implementation quality and pollution trends must also be examined.

Cleaner air has been conclusively established.

Maintenance and operating frequency no longer matter.

Pollution monitoring can be replaced by expenditure reporting.

A city receives pollution from neighbouring areas while also producing emissions locally. Which response best follows the article’s reasoning?

Combine local source control with cooperation across neighbouring jurisdictions.

Suspend local action until all outside pollution is eliminated.

Treat the municipal boundary as the limit of pollutant movement.

Transfer all responsibility to neighbouring authorities.

Households segregate waste, but collection vehicles mix it again and accumulated waste is later burned. Which policy lesson follows most directly?

Citizen behaviour must be connected to reliable downstream municipal services.

Household participation makes public service delivery unnecessary.

Awareness activities alone are sufficient to prevent waste burning.

Waste segregation removes the need to examine collection practices.

Practice MCQs Current Affairs

Green Diwali 2026: Clean Air and Governance for UPSC — MCQs with Answers

Test what you know about Green Diwali 2026: Clean Air and Governance for UPSC with 10 UPSC Prelims-style questions. Try each one first, then tap “Show answer” for the correct option and its explanation.

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10 practice questions
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Answers & explanations

Answers revealed

Try each question yourself first, then check the answer.

Q1. Consider the following statements about particulate matter: 1. PM2.5 and PM10 denote particle-size fractions rather than individual chemicals. 2. The PM2.5 size fraction falls within the broader PM10 size range. Which of the statements given above is/are correct?
1. A. 1 only
2. B. 2 only
3. C. Both 1 and 2
4. D. Neither 1 nor 2
Show answer

Correct answer: (C) Both 1 and 2

Explanation

Correct Answer: (C). Both statements are correct. PM2.5 covers particles with an aerodynamic diameter of 2.5 micrometres or less, whereas PM10 extends to 10 micrometres. These are size classifications, so the finer fraction belongs within the broader range. Options accepting only one statement or rejecting both are therefore incorrect.
Q2. Which interpretation of an AQI value of 200 is most appropriate?
1. A. It is an index value communicating air quality, not a direct PM2.5 concentration.
2. B. It means PM2.5 concentration is necessarily 200 micrograms per cubic metre.
3. C. It gives the percentage contribution of traffic to pollution.
4. D. It is the simple average of all measured pollutant concentrations.
Show answer

Correct answer: (A) It is an index value communicating air quality, not a direct PM2.5 concentration.

Explanation

Correct Answer: (A). AQI communicates air quality through an index and categories. It is distinct from a pollutant concentration, so option B confuses two quantities. It does not apportion pollution among sources, making C incorrect. The framework uses the worst available pollutant sub-index rather than the simple average suggested in D.
Q3. Consider the following pairs: 1. Emission — Pollution released from a source 2. Concentration — Pollutant amount in a given volume of air 3. Exposure — Financial expenditure on pollution-control equipment How many of the above pairs are correctly matched?
1. A. Only one
2. B. Only two
3. C. All three
4. D. None
Show answer

Correct answer: (B) Only two

Explanation

Correct Answer: (B). Pairs 1 and 2 correctly distinguish source release from pollutant amount in air. Pair 3 is incorrect because exposure concerns pollution encountered by people, including how long they encounter it. Financial expenditure measures an input into control activities, not human exposure. Thus exactly two pairs are correctly matched.
Q4. Consider the following statements: 1. Particulate matter can arise only through direct emission from a source. 2. Air pollution affects respiratory health but has no relevance to cardiovascular health. Which of the statements given above is/are correct?
1. A. 1 only
2. B. 2 only
3. C. Both 1 and 2
4. D. Neither 1 nor 2
Show answer

Correct answer: (D) Neither 1 nor 2

Explanation

Correct Answer: (D). Neither statement is correct. Particles can be emitted directly or form through atmospheric chemical reactions, so statement 1 is too restrictive. Fine particles can reach deep into the lungs and some can enter the bloodstream. The article therefore connects air pollution with cardiovascular as well as respiratory health, contradicting statement 2.
Q5. Assertion: Improved air quality immediately after a campaign does not by itself establish that the campaign caused the improvement. Reason: Wind, rainfall and atmospheric mixing can alter pollutant concentrations. Select the correct answer.
1. A. Both are correct, and the Reason explains the Assertion.
2. B. Both are correct, but the Reason does not explain the Assertion.
3. C. The Assertion is correct, but the Reason is incorrect.
4. D. The Assertion is incorrect, but the Reason is correct.
Show answer

Correct answer: (A) Both are correct, and the Reason explains the Assertion.

Explanation

Correct Answer: (A). Both statements are correct and causally connected. Weather can change measured concentrations independently of the campaign’s emission reductions. A suitable comparison period and attention to meteorology are therefore needed before assigning causation. B misses this explanatory connection, while C and D wrongly reject one of the correct statements.
Q6. Which interpretation of the Green Diwali awareness campaign is consistent with the article?
1. A. Its announcement alone establishes a nationwide enforceable ban.
2. B. It removes the need for municipal waste collection.
3. C. It encourages voluntary choices but does not itself establish a nationwide legal ban.
4. D. It makes year-round source-specific pollution control unnecessary.
Show answer

Correct answer: (C) It encourages voluntary choices but does not itself establish a nationwide legal ban.

Explanation

Correct Answer: (C). The article distinguishes awareness and voluntary participation from enforceable legal restrictions. A campaign announcement alone does not establish the national prohibition asserted in A. Citizen choices still require municipal support, so B is wrong. Sustained control of multiple pollution sources remains necessary throughout the year, contradicting D.
Q7. Which function is assigned to the PRANA portal in the article?
1. A. Determining the overall AQI from pollutant sub-indices
2. B. Monitoring NCAP implementation, including physical and financial progress
3. C. Calculating every pollution source’s share from a daily AQI value
4. D. Converting a voluntary pledge into a nationwide legal prohibition
Show answer

Correct answer: (B) Monitoring NCAP implementation, including physical and financial progress

Explanation

Correct Answer: (B). PRANA monitors implementation of the National Clean Air Programme, including physical and financial progress. Option A describes AQI determination rather than this monitoring role. A daily AQI value does not give source shares, making C incorrect. A monitoring portal does not perform the legal transformation claimed in D.
Q8. A municipality reports that all funds for dust-control equipment have been spent. Which conclusion is most justified?
1. A. Cleaner air has been conclusively established.
2. B. Maintenance and operating frequency no longer matter.
3. C. Pollution monitoring can be replaced by expenditure reporting.
4. D. Implementation quality and pollution trends must also be examined.
Show answer

Correct answer: (D) Implementation quality and pollution trends must also be examined.

Explanation

Correct Answer: (D). Expenditure records resource use, not automatically environmental improvement. The article stresses routes, operating frequency, maintenance and relevant pollution trends. A treats spending as proof of an outcome; B dismisses implementation conditions; C replaces outcome evidence with an input measure. D correctly requires examination of both implementation quality and results.
Q9. A city receives pollution from neighbouring areas while also producing emissions locally. Which response best follows the article’s reasoning?
1. A. Combine local source control with cooperation across neighbouring jurisdictions.
2. B. Suspend local action until all outside pollution is eliminated.
3. C. Treat the municipal boundary as the limit of pollutant movement.
4. D. Transfer all responsibility to neighbouring authorities.
Show answer

Correct answer: (A) Combine local source control with cooperation across neighbouring jurisdictions.

Explanation

Correct Answer: (A). Pollution can move across administrative boundaries, so local accountability and regional cooperation must work together. B delays action on sources the city can influence. C incorrectly assumes air is contained by municipal limits. D shifts responsibility away from local sources. A addresses both local emissions and cross-boundary pollution.
Q10. Households segregate waste, but collection vehicles mix it again and accumulated waste is later burned. Which policy lesson follows most directly?
1. A. Household participation makes public service delivery unnecessary.
2. B. Citizen behaviour must be connected to reliable downstream municipal services.
3. C. Awareness activities alone are sufficient to prevent waste burning.
4. D. Waste segregation removes the need to examine collection practices.
Show answer

Correct answer: (B) Citizen behaviour must be connected to reliable downstream municipal services.

Explanation

Correct Answer: (B). Segregation loses value when collection mixes waste or subsequent handling leads to burning. The article therefore links household action with the next institutional step. A removes a necessary public responsibility, C overstates awareness alone, and D ignores the failure in collection. B correctly integrates behaviour with service delivery.

More practice MCQ sets

All MCQ sets

Q1. Consider the following statements about particulate matter: 1. PM2.5 and PM10 denote particle-size fractions rather than individual chemicals. 2. The PM2.5 size fraction falls within the broader PM10 size range. Which of the statements given above is/are correct?

Q2. Which interpretation of an AQI value of 200 is most appropriate?

Q3. Consider the following pairs: 1. Emission — Pollution released from a source 2. Concentration — Pollutant amount in a given volume of air 3. Exposure — Financial expenditure on pollution-control equipment How many of the above pairs are correctly matched?

Q4. Consider the following statements: 1. Particulate matter can arise only through direct emission from a source. 2. Air pollution affects respiratory health but has no relevance to cardiovascular health. Which of the statements given above is/are correct?

Q5. Assertion: Improved air quality immediately after a campaign does not by itself establish that the campaign caused the improvement. Reason: Wind, rainfall and atmospheric mixing can alter pollutant concentrations. Select the correct answer.

Q6. Which interpretation of the Green Diwali awareness campaign is consistent with the article?

Q7. Which function is assigned to the PRANA portal in the article?

Q8. A municipality reports that all funds for dust-control equipment have been spent. Which conclusion is most justified?

Q9. A city receives pollution from neighbouring areas while also producing emissions locally. Which response best follows the article’s reasoning?

Q10. Households segregate waste, but collection vehicles mix it again and accumulated waste is later burned. Which policy lesson follows most directly?

More practice MCQ sets