This is an indirect measurement of passive sources where odour emission is determined by measuring wind velocities and concentrations across the plume profile downwind of the source simultaneously. The turbulent effects of gases from the ground surface to the lower atmosphere is measured. This method requires several samples to be taken in order to characterize the source. Until recently, direct measurements using a static flux hood or wind tunnel was usually recommended over micrometeorological method. However, recent advancements in field olfactometry and in aerial ambient sampling (Sampling Drones) has allowed this method to be an extremely useful method of quantifying plants with fugitive sources or numerous emissions that are impractical to measure using direct sampling.
One of the benefits of the micrometeorological method over a direct method is there is no perturbation of the source.