O Level Biology MCQs – Certification Test 914

Pollution: Smog as Cause MCQs (Question 914) – App & e-Book Download

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MCQ: 914

No smog occurs if

cool air is allowed to escape
if pollutants like smoke and sulphur dioxide are prevented from escape
if cool air and pollutants are prevented from escape
if pollutants like smoke and sulphur dioxide are escape

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