Division IV Selection of plots and location

Ambient air quality monitoring shall be site specific and shall be carried out on plots where meteorology and deposition data are available. Sites with variable exposure should be chosen i.e. sites where high exposure is expected in addition to a few background stations.

Air pollution concentrations shall be measured near, but outside the forest, in a place representative of the plot. Monitoring can be carried out in an open field, preferably where the samplers for wet deposition and the meteorological equipment are installed.