scope:

Guideline VDI 4280 Part 3 describes rules of planning the determination of air quality characteristics in the vicinity of stationary emission sources. This guideline may be applied if the emission sources considered are specified as individual point or plane sources or groups of such sources showing a common surrounding, where the contribution of these emission sources to the air quality characteristic of interest is relevant. Air quality characteristics considered are mean values and numbers of exceedances of different aggregations of measured values (e.g. quantiles).

The present guideline describes two measurement strategies of performing investigations, which are specifically designed for complementary boundary conditions:

• Measurement strategy A: Determination of air quality characteristics in the vicinity of the emission sources considered by measurements at a selected measurement site; the selection of the measurement site and the assessment of the spatial transfer (representativeness) are based on dispersion calculations

• Measurement strategy B: Determination of air quality characteristics in the vicinity of the emission sources considered by measurements at least at four spatially distributed measurement sites

Measurement strategy A may be applied, if background information providing usable data on the spatial structure of the air quality characteristics of interest is available from dispersion calculations. Measurement strategy B may be applied, if the spatial Messergebdistribution of air quality characteristics in the area of determination shall be determined by means of continuous or discontinuous measurements and background information providing usable data on the spatial structure of the air quality characteristics of interest obtained by dispersion calculations is not available.

The specified measurement strategies allow correct and comparable implementations of legal requirements in the field of environmental protection, e.g. within the context of European Directives [G6; G7] or in legal air quality control.