We propose a systematic study of the environments of a representative sample of Radio Loud Quasars (RLQ) and Radio Quiet Quasars (RQQ) in two different redshift ranges: z˜3.1 and z˜4. These redshift ranges are optimal for the study of environment evolution in the early universe. Furthermore, the sample of RLQ and RQQ are designed to disentangle the role of galactic interactions in the radio emission phenomenon, and thus, to test the unified model for AGN. Using the GRANTECAN-OSIRIS tunable filters (TF) we expect to build up a distribution function for the emission line galaxies around each quasar. We assume that emission and non-emission line galaxies have similar distributions. This assumption along with photometric redshifts observations will allow us to discriminate between galaxies associated with quasars and field galaxies.