" Yes. 'disinfectants', anyway. Not 'odour'.
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park sang joonI think mingling modifies "an odour of disinfectants."Yes. 'disinfectants', anyway. Not 'odour'. You might say that 'mingling as the afternoon ...' is a reduced relative clause. It's non-restrictive; hence, the comma. It also counts as a participle clause.
... there was in them an odour of disinfectants, mingling as the afternoon wore on with the crude stench of humanity.Here's a version with actual parentheses around the parenthetical phrases: