The progress of the petroleum exploration in Brazil led us more and more to the high-seas, where most of the national petroleum fields were discovered. The increase of the offshore production and the growing usage of FPSO platforms resulted in a higher activity level of the ships related to the petroleum exploration and production process, mainly at the Campos Basin region, the main producer zone in Brazil. However, the expansion of the maritime activity also implicates in higher pollutants emission, since the vessels use marine diesel or bunker as fuel, bringing consequences to the environment and to human beings. The present dissertation quantifies the pollutants and greenhouse gases emissions from ships involved with the petroleum exploration and production at Campos Basin. The applied methodology considered a bottom-up approach to estimate the energy consumption of the ships, based on quantity, characteristics and activity data regarding the related ships. Thereafter, emission factors were used to determine the amount of each emitted pollutants. The results were compared with international, national and regional emission data, what led us to conclude that the achieved emission values are significant. Final discussions introduce methods and opportunities to reduce emissions from ships, indicate suggestions for complementary researches and connect the obtained results with the importance of paying royalties to the petroleum producer states and cities.