The study of the neutralization of dusts shall include : the comparative analysis of the regulations and instructions applied in the Community countries and in the United Kingdom; the various methods of application: the nature of the substance, frequency of spreading, frequency of inspection, and the detailed justifications of the sampling method used.· ###>- les modalités d'application : nature du produit, fréquence des épandages, périodicité des contrôles, ainsi que la justification motivée de la méthode du prélèvement."