puits (1) test (1) spectacle (1) sécurité (1) traitement (1) bruit (1) besoin (1) matériau (1) industrie (1) santé (1) exposition (1) effet (1) dose (1) ciment (1) industrie du bâtiment (1) Mexique (1) Area (1) Methods (1) Cases (1) Programs (1) Area (1) Employees (1) Weights and measures (1) Population (1) Percentage (1) Noise (1) Manufacturers' agents (1) Industries (1) Impact (1) Hearing (1)