The costs and applicability of air emission abatement technologies are vital in the development of reduction strategies. These have ranged from investigating technologies, to controlling a single source, to covering all industries in a province. The generic devices available for particulate control are gravity settlers, cyclones, electrostatic precipitators, wet scrubbers and baghouses. Gaseous control equipment includes combustion, adsorption, absorption and condensation. Knowledge of the estimated costs allows a facility to plan its financial future or a government agency to plan future control policy options.