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Model simulations predict that more than 75% of total OA from BB sources over the United States is influenced by dark aging. Concentrations of simulated (A) total bbOA mass (both primary and secondary) and (B) OOA mass from BB sources that has undergone at least one nighttime NO3 reaction, as well as (C) the ratio of bbOOA mass (where bbOA is greater than 0.5 μg⋅m−3) influenced by dark aging to total bbOA.
