The Late Triassic–Early Jurassic transition (~201 Ma) was marked by one of the “Big Five” Phanerozoic mass extinction events, the end–Triassic mass extinction, which was likely driven by massive carbon emissions associated with the emplacement of the Central Atlantic Magmatic Province (CAMP). These emissions are thought to have led to a substantial increase in atmospheric pCO₂ levels. In this study, we present a 6 Myr pCO₂ record spanning the latest Triassic (Rhaetian) to Early Jurassic (Hettangian–Sinemurian), based on high-resolution δ¹³C data from terrestrial organic matter and C₃ plants collected from northwestern China, the Polish Basin, and the Newark–Hartford Basin. Our results show that pCO₂ rose from 2790 ± 1991 ppmv in the latest Triassic to 4508 ± 4097 ppmv in the earliest Jurassic within approximately 60 kyr.