Long-term lidar observations have shown somewhat increased aerosol concentration in the autumn-winter of 2006-2007 in the lower stratosphere above Tomsk (56.5°N; 85.0°E). The integral aerosol scattering exceeded 2-3 times the many-year mean value of the reference period 1997-2006. At the end of January, 2007, at a height of about 19 km a distinct aerosol layer with the scattering ratio in its maximum up to 1.6 was recorded. The analysis of the aerosol pollution dynamics allows us to attribute this phenomenon to eruption products of Mt. Rabaul (Papua, New Guinea: 4.3°S; 152.2°E), the emission height of which on October 7, 2006 reached 18 km. The background state of the stratosphere aerosol layer in conditions of the long volcanically quite period 1997-2006 was violated, that should be taken into account when analyzing long-term trends in variations of the stratosphere aerosol content. Dust aerosol clouds in the beginning of February, 2007 were recorded at heights 5-8 km above Tomsk. This can be attributed to dust storms in Kazakhstan or even in farther south-west desert areas.