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The Planetary Boundary Layer () is an important part of the atmosphere that is relevant in different atmospheric fields like pollutant dispersion, and weather forecasting. In this study, we analyze four and five-year datasets of measurements gathered with a ceilometer and a microwave radiometer to study the PBL structure respectively, in the mid-latitude urban area of Granada (Spain). The methodologies applied for the Height ( ) detection (gradient method for ceilometer and the combination of parcel method and temperature gradient method for microwave radiometer) provided a description in agreement with the literature about the structure under simple scenarios. Then, the behavior is characterized by a statistical study of the convective and stable situations, so that the was obtained from microwave radiometer measurements. The analysis of the statistical study shows some agreement with other studies such as daily pattern and yearly cycle, and the discrepancies were explained in terms of distinct latitudes, topography and climate conditions. Finally, it was performed a joint long-term analysis of the residual layer (RL) provided by ceilometer and the stable and convective layer heights determined by microwave radiometer, offering a complete picture of the evolution by synergetic combination of remote sensing techniques. The PBL behavior has been used for explaining the daily cycle of Black Carbon (BC) concentration, used as tracer of the pollutants emissions associated to traffic.The measurement campaign was carried out at the Andalusian Institute of Earth System Research (IISTA-CEAMA). This station is part of European Aerosol Research Lidar Network -EARLINET (Pappalardo et al., 2014) since 2004 and at present is an active station of ACTRIS (http://actris2.nilu.no/). This station is located at Granada, a medium sized (population of around 238 000 inhabitants over an area of 88 km²) nonindustrialized city in the Southeastern Spain at about 50 km away from the Mediterranean coast (Granada, 37.16°N, 3.61°W, 680 m a.s.l.) (INE, 2017). Granada is surrounded by mountains and dominated by Mediterranean-continental conditions, which are responsible for large seasonal temperature differences, providing cool winters and hot summers. The most humid period goes from late autumn to early spring.The rest of the year is characterized by rain scarcity. It is worthy to note that the Southeastern Spain is usually affected by mineral dust outbreaks from the Saharan Desert (North Africa) (e.g. Lyamani et al.,

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