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Measurements investigate PAN and PAA formation in the Amazon rainforest, suggesting isoprene influences their abundance.
PAN (CH 3 C(O)O 2 NO 2 ) and PAA (CH 3 C(O)OOH) are formed in the atmosphere uniquely and competitively from the same precursor radical (CH 3 C(O)O 2 ), whereby the relative rates of formation of PAN and PAA are determined by the abundances of HO 2 and NO 2 .
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Nelson et al. (2026) studied this question.
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