SummaryChanges in the level of phenolic compounds in needles of young Scots‐pine (Pinus sylvestristrees of various provenances were studied in an environment polluted by sulphur dioxide and fluorine compounds, and in a control environment. An increase in the content of ortho‐diphenols (o‐dPh) and total phenols (TPh) was found in the First year of needle development. This increase was significantly greater in the plants from the polluted environment. Relative to levels in the control environment, the highest level of phenols in the polluted environment was found in 2‐year‐old needles, followed by 3‐year‐old and then 1‐y