| http://www.w3.org/ns/prov#value | - Moreover, nitrogen oxides are a significant contributor to acid rain.Unfortunately, the high temperatures within boilers render most common methods of reducing NO.sub.x concentrations, such as effluent scrubbing or catalyst grids, uneconomical, infeasible, or both.BACKGROUND ARTMany different processes and compositions have been proposed for chemically reducing nitrogen oxide levels in an effluent
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