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Option 3 : have shot up alarming since August
The error is in part 3 as word ‘alarmingly’ should be used instead of ‘alarming’. Here, ‘alarmingly’ as an adverb should be used before phrasal verb ‘shot up’. Alarmingly refers to expressing concern over an incident.
Therefore, the correct sentence is:
Air quality turned poor because of the rise in the dust particles, levels of which have shot up alarmingly since August.
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