Aerobiological studies in Vinnitsa in 1999–2000 and 2009–2010 revealed a relative stability for ragweed pollination patterns in Vinnitsa region. Periods of most intensive pollination were stabile too. However, extraodinary hot summer 2010 caused early appearance of Ambrosia pollen in the atmosphere, and the record amount of ragweed pollen was determined in 2011. The peak of ragweed pollination was 7 times higher the maximum stated above. But the timing of the intensive Ambrosia pollination periods stays mostly the same. This conclusion is important for pollen forecasting and pollinosis control in population.
