Research has shown that alkaline emissions of the Kunda Cement Plant in NE Estonia cause changes in the physiological-biochemical conditions of conifers reducing their bioproduction and vitality. The dependence of radial increment of 75-85-year old Pinus sylvestris L. and Picea abies L. on high concentrations of K and Ca in the growth environment (soil, precipitation, air) and the level of pollution bad is discussed. Among the pollutants emitted by the Kunda Cement Plant, of which dust (pH = 12.3-12.6) has accounted for 87-96 % in recent years, alkaline components predominate. These have an important effect on the reaction (pH = 7.2-7.9) and chemical composition of precipitation. A clear fall can be observed in the radial increment of pine and spruce on observation sites at a distance of 2-3 km to the west and lip to 5 km to the east form the cement plant where the emission load is especially big (1000-2400g m(-2) yr(-1)). The effect of alkaline dust pollution on conifers growing farther away from the cement plant (5-15 km to the west and over 10 km to the east, 100-300 g m(-2) yr(-1)) is insignificant.