Terpenoids (isoprene and monoterpenes) are highly reactive Volatile Organic Compounds (VOCs) known for decades for their biogenic origin. However, there is some strong evidence of their anthropogenic origin through, for instance, the most recent studies in North American cities investigating their use as Volatile Chemical Products (VCP) in indoor environments. The overall objective of DATAbASE is to investigate the industrial and non-industrial anthropogenic origin of terpenoids in the urban atmosphere and to evaluate their importance on urban pollution. To do so we have compiled and re-analyzed 15 VOC datasets collected over the last decade in contrasting urban areas from mid-latitudes to subtropical regions. In parallel, we have performed 0D box model simulations using the Cloud Explicit Physico-chemical Scheme (CLEPS). CLEPS is coupled to MCM v3.3.1 to evaluate the impact of anthropogenic terpenoids on atmospheric chemistry by establishing scenarios representative of contrasting urban environments. While the systematic presence of anthropogenic terpenoids has been demonstrated in urban atmosphere worldwide, we have pointed out the significant role of road transport emissions and, for the first time, the industrial emissions of a-pinene, one major monoterpene, in the northern harbor city of Dunkirk, France. Emissions Ratios and Positive Matrix Factorization (PMF) were implemented to quantify the anthropogenic emissions of urban terpenoids. In Paris megacity, the emissions of monoterpenes were estimated to be 11.8 tons each year. In Dunkirk, 3.5 tons of industrial a-pinene are emitted per year which is in the same order of magnitude as in Paris. While absolute anthropogenic emissions of terpenoids usually represent less than 3% of other anthropogenic VOC emissions, they dominate the reactivity of anthropogenic VOC emissions by one to three orders of magnitude regarding nighttime oxidation by NO3 and ozonolysis, respectively. The 0D modelling has been developed to test and evaluate those potential effects. This presentation will synthesize the recent findings of DATAbASE and propose future directions.