Photochemistry of iron-containing secondary organic aerosol is impacted by relative humidity during formation. - Garner, Natasha M.; Mahrt, Fabian; Top, Jens; Tadei, Virginia; Kilchhofer, Kevin; Takahama, Satoshi; El Haddad, Imad; Bell, David M.; Ammann, Markus; Alpert, Peter A. (NPJ Climate & Atmospheric Science, 2025)