Three types of vegetation can be d&cerned with regard to the acoustic climate investigated in 4 different plantations, 2 plant communities, and a grass field, hi the first type of vegetation, i.e. beech and ashtree jorests, the excess attenuation was at least 10 dB/ lO0 m with the receiver at the same height as the source, 1"2 m, and at least 5 dB/100 m with the receiver at 3" 9 m and even more in most 1/3-octave bands studied. hi the second O,pe of vegetation, i.e. the mixed poplar jorest and the Stellario carpinetum, a so-called 'sound window" could be detected around 2kHz and the ground effect was more extended towards the highJi'equenc.v range compared with the first OTe of vegetation, h7 the third O,pe of vegetation consisting of evergreen sprucefir, best excess attenuation was [bund & the closedjbrest: at least 10 dB/100 m with the receiver at 1.2m, and 7dB/lOOm with the receiver at 3.9m," & the belts the excess attenuation was at least 7dB/lO0 m and 4 dB/lO0 m respectiveO'. Best attenuation was, ther~fore,jbund in the closedJorest, and not in the belts. It was concluded that the sound attenuat&g capaci O' o['planted vegetations can be used to abate noise pollution in town and landscape plamling i[the plantations are at least 12 m wide. To obtain the best effect the rows of trees have to be planted perpendicular to the direction of the sound field.