An episode of relatively thick (till ~3 km) aerosol formation over the urban area of Sofia city was observed by lidar at a wavelength\r\nof 1064 nm. The lidar is part of Sofia lidar station at the Institute of Electronics of Bulgarian Academy of Sciences. Analysis of the\r\nweather conditions during the measurement period explains the stable persistence of such formation of human-activity aerosol\r\nover the town for the days of observation 20, 21, 23, and 24 June, 2011. The estimated top of the Planetary Boundary Layer for the\r\nmeasurement dated 23 June showed unusually high altitude ~2200m above ground. The results are presented in terms of vertical\r\natmospheric backscatter coefficient profiles and color maps of the aerosol stratification evolution
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