The GATE Grind

GATE 2023 ES – Question 18

Air and Noise Pollution · Air Quality Management · 1 mark · Multiple choice

Under CPCB’s2009 notification, which24-hour standards are correct? All concentrations are µg/m³.

  1. Ambient PM₂.₅60;ambient PM₁₀100
  2. Indoor PM₂.₅60;ambient PM₁₀100
  3. Ambient PM₂.₅60;indoor PM₁₀100
  4. Indoor PM₂.₅60;indoor PM₁₀100

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Show answer and explanation

Correct answer: (A) Ambient PM₂.₅60;ambient PM₁₀100

Explanation

The referenced National Ambient Air Quality Standards apply to ambient outdoor air. Their24-hour limits are60 µg/m³ for PM₂.₅ and 100 µg/m³ for PM₁₀. They are not the indoor standards described in the other choices. Thus **A**.

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