The Indochina biomass burning (BB) season in springtime has a substantial environmental impact on the surrounding areas in Asia. Aircraft data obtained during the campaign in Asia of the Effect of Megacities on the transport and transformation of pollutants on the Regional to Global scales (EMeRGe) were available between 12 March and 7 April 2018. The transport of BB aerosols from Indochina and its impacts on the downstream area was evaluated using a WRF-Chem model. At the BB transport layer (2000-4000 m), the contribution of the long-range transported BB plume was as high as 30–80 % for most of the species over South China (SC), Taiwan, and the East China Sea (ECS). The combination of BB aerosol enhancement with cloud water resulted in a reduction of incoming shortwave radiation at the surface in the SC and ECS by 5-7% and 2-4%, respectively, which potentially has significant regional climate implications.