After evaluating all sampling strategies, one can decide that the use of only one grab sample, one 24-h sample, one 48-h sample or one 7-d sample has a relatively high chance of deviating from the true value. So, much caution has to be taken when estimating an EF based on only one sample of a short-term sampling strategy. Furthermore, since the spread on the estimated EFs was larger for dataset 1, the use of only one sample is certainly not advisable in situations where large differences in NH3 emissions between days and between hours exist. Of course, in practice, NH3 emissions are not determined on such short periods. Therefore, in Section 3.2, the precision and accuracy as a function of the number of samples was determined. The estimated EF based on one long-term weekly grab sample strategy was, in contrast to the other sampling strategies, much more precise and accurate. With one single long-term weekly grab sampling strategy, the estimated EF is within 15% of the true EF.