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We propose using the surface of pine trees needles to biomonitor the bioaerosol emissions at a composting plant. Measurements were based on 16S rRNA gene copy numbers of  Saccharopolyspora rectivirgula , a bioindicator of composting plant emissions. A sampling plan was established based on 29 samples around the emission source. The abundance of 16S rRNA gene copies of  S. rectivirgula  per gram of  Pinus halepensis  needles varied from 10 4  to 10 2  as a function of the distance. The signal reached the background level at distances around the composting plant ranging from 2 km to more than 5.4 km, depending on the local topography and average wind directions. From these values, the impacted area around the source of bioaerosols was mapped.

Needles of Pinus halepensis as Biomonitors of Bioaerosol Emissions