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GATE 2022 ES – Question 47

Air and Noise Pollution · Air Quality Management · 2 marks · Multiple select

Under India’s2009 National Ambient Air Quality Standards, select correct averaging-time statements.

  1. SO₂,NO₂ annual;O₃,CO eight-hour
  2. SO₂,CO annual;O₃,NO₂ eight-hour
  3. SO₂,CO eight-hour;O₃,NO₂ hourly
  4. SO₂,NO₂24-hour;O₃,CO hourly

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Correct answer: (A) SO₂,NO₂ annual;O₃,CO eight-hour; (D) SO₂,NO₂24-hour;O₃,CO hourly

Explanation

The notified table specifies annual and 24-hour values for SO₂ and NO₂, and 8-hour and 1-hour values for ozone and carbon monoxide. Therefore **A, D** are correct. B and C interchange pollutant groups. These are the2009 standards asked by the paper, rather than a claim about subsequent revisions.

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