Minimization of the risk associated with spray applications requires a proper understanding of the spray drift \udphenomenon. This fact has led to the development of several techniques to measure the deposition on horizontal surfaces \udas well as the airborne spray profiles. Assessment of airborne spray drift is particularly difficult because this \udphenomenon is subject to variable micrometeorological conditions. However the monitoring of airborne drift has a great \udimportance since it can be carried over long distances. This paper reviews main sampling techniques currently used to \udasses the airborne spray drift, based on passive collectors and tracers. Theoretical principles that determine the efficiency \udof passive samplers are studied as well as the performance of different types of tracers. On the other hand, this paper \udshows new airborne spray drift assessment techniques based on lidar technology, reviewing its principle of operation as \udwell as its practical application in several spray drift trials. It is concluded that the lidar technique has significant \udadvantages over conventional methods, especially in terms of time consumption and monitoring capabilities. However, \udthe future adoption of lidar technology for airborne spray drift studies will be subjected to the development of lidar \udinstruments really adapted to this application.
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