To further understand the emissions from the entire petrochemical industry, in this study, we collected samples for VOC analysis from process-specific units from petrochemical, basic chemical, and chlorinated chemical plants in the YRD region. The main purpose of this study are: (1) To identify the differences of VOC emissions among various manufacturing processes; (2) To compile composite profiles for the petrochemical industry based on individual compositions from each emission process, which is useful for speciated emission inventory and source apportionments based on receptor models. (3) To estimate the ozone potential formations and carcinogenic risk (CR) exposure at a process unit level, which provide information for policy-makers about VOC control management. This study can serve as the first step for future studies on process-specific VOC emissions from the whole petrochemical industry and support formulation of efficient VOC abatement strategies in the petrochemical-based regions.