The GATE Grind

GATE 2021 CE (CE2) – Question 27

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple select

Which statements are correct?

  1. Indoor CO produces carboxyhaemoglobin and prolonged exposure can cause cardiovascular harm.
  2. VOCs are precursors of photochemical smog in sunlight.
  3. Long exposure to photochemical smog can cause chest constriction and mucous-membrane irritation.
  4. Indoor VOCs form photochemical smog that causes cardiovascular disease.

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Show answer and explanation

Correct answer: (A) Indoor CO produces carboxyhaemoglobin and prolonged exposure can cause cardiovascular harm.; (B) VOCs are precursors of photochemical smog in sunlight.; (C) Long exposure to photochemical smog can cause chest constriction and mucous-membrane irritation.

Explanation

CO binds haemoglobin and reduces oxygen transport, supporting A. VOCs participate with nitrogen oxides and sunlight in photochemical oxidant production, supporting B. These oxidants irritate the respiratory system, supporting C. D incorrectly presents indoor VOC exposure as the direct photochemical-smog cardiovascular mechanism. **A,B,C**.