This Data in Brief (DiB) article addresses the relationships among individuals’ transport habits, perceptions, and attitudes regarding transport-related pollution, as well as their willingness to act for environmental change. There are presented descriptive statistics, basic comparisons, and bivariate correlations among the core variables of the study. Additionally, the attached dataset appends information from a nationwide sample of 1,250 citizens in the Dominican Republic, with sex, age and habitat distribution proportional to the national census. The research database contains the full set of questions and responses to the research questionnaire, which is also attached to the supplementary files along with its codebook, making it possible to conduct further data explorations for research-related, divulgation, and educational purposes. For more information about the root study, it is advisable to read the paper “Who wants to change their transport habits to help reduce air pollution? A nationwide study in the Caribbean”, published in Journal of Transport & Health [1].