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The natural and mixed recycled aggregate production for use as road base and subbase have been compared through an attributional life cycle assessment. The primary data have been collected in a basalt natural aggregate production facility and in a recycling facility of mixed aggregate, both located in Southeast Brazil. The topic is important since there is a local increasing demand for aggregate use in road construction and there are no studies related to the environmental aspects of the production of natural and mixed recycled aggregate, and no suitable, site-specific data are available to develop a reliable life cycle investigation. The potential environmental impacts related to the two production processes have been estimated by using the Impact 2002+ methodology. The results show that the production of recycled aggregates is preferable to that of natural materials for the impact categories of “respiratory …