There were done 11 bore holes for Austrian pine and 51 bore holes for Scotch pine in the forest stand subjected to direct air pollutants effect. After dating and synchronization of increment curves their increment trends were equalled. Increment index was derived for each tree from these increment trends as a ratio of actual and supposed increment in the year 1992. Significance of differences between actual and supposed increments as well as between increment indexes of both pine trees was tested by statistical test. With equal damage of trees by air pollutants, being expressed by defoliation of crowns, Austrian pine had higher increment indexes by 20-25% than Scotch pine. Based on this knowledge we can evaluate Austrian pine as more resistant against air pollutants than Scotch pine.