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UPSC 2003: Which one of following is produced during the formation of photochemical smog?
(a)Hydrocarbons
(b)Nitrogen Oxides
(c)Ozone
(d)Methane
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Not attemptedCorrect Answer: (c) Ozone
Ground-level ozone (O₃) is a secondary pollutant generated by the reaction of nitrogen oxides and hydrocarbons in sunlight and is the key component of photochemical smog; hydrocarbons and NOx are precursors, not main products, and methane is unrelated. ([explore.britannica.com](https://explore.britannica.com/explore/savingearth/air-pollution?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2003 Environment & Ecology question?▼
The correct answer is option (c): Ozone. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Pollution & Waste Management question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2003, GS Paper 1, as Question 118. It falls under Environment & Ecology > Pollution & Waste Management.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Pollution & Waste Management?▼
UPSC has asked 38 questions from Pollution & Waste Management (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.