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The outer Galaxy is an environment with metallicity lower than the Solar one.Because of this, the formation and survival of molecules in star-formingregions located in the inner and outer Galaxy is expected to be different. Togain understanding on how chemistry changes throughout the Milky Way, it iscrucial to observe outer Galaxy star-forming regions to constrain modelsadapted for lower metallicity environments. In this paper we present a newobservational project: chemical complexity in star-forming regions of the outerGalaxy (CHEMOUT). The goal is to unveil the chemical composition in 35 densemolecular clouds associated with star-forming regions of the outer Galaxythrough observations obtained with the IRAM 30m telescope. In this first paper,we present the sample, and report the detection at 3~mm of simple organicspecies HCO+, H13CO+, HCN, c-C3H2, HCO, C4H, and HCS+, of the complexhydrocarbon CH3CCH, and of SiO, CCS and SO. From c-C3H2, we estimate newkinematic heliocentric and Galactocentric distances based on an updatedrotation curve of the Galaxy. The detection of the molecular tracers does notseem to have a clear dependence on the Galactocentric distance. We also analysethe HCO+ line profiles. We find high velocity wings in ~71% of the targets, andtheir occurrence does not depend on the Galactocentric distance. Our results,confirmed by a statistical analysis, show that the presence of organicmolecules and tracers of protostellar activity is ubiquitous in thelow-metallicity environment of the outer Galaxy. Based on this, and on theadditional evidence that small, terrestrial planets are omnipresent in theGalaxy, we support previous claims that the definition of Galactic HabitableZone should be rediscussed in view of the ubiquitous capacity of theinterstellar medium to form organic molecules.

CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy. I. Organic molecules and tracers of star-formation activity