Table 1. Measuring strategies to acquire data in an open dairy barn by using the INNOVA analyser

Measuring strategies	Results from the analysis
Sample integration time (SIT)
NH3, CO2, and CH4	Time required for measurement of all the gases at one SL- SIT5: 1 minute and 15 seconds- SIT20: 2 minutes and 30 seconds
Number of repetitions
NH3	It is suggested to- Perform three repetitions in each SL;
	- Consider the mean value of the second and third repetitions as the estimated value of NH3 concentration determined at each SL;
Sampling location (SL)
Position	Central area of the barn
Number	Two SLs reduced the variability of the concentrations below 15%.Three SLs reduced the variability of the concentrations below 10%.
Distance between two SLs	A 10-meters distance between two SLs reduced data variability of NH3 concentration below 10%