Air Scrubber NOx – Out Nitrogen Dioxide, Clean Air Wins A large Midwestern university research facility uses various Nitric Acid formulations for etching Niobium metal. The etching process produces an extremely smooth micro-surface for maximizing the metal’s superconducting character. The by-product of the etching process is various Nitrogen Oxides (NO x ), primarily Nitrogen Dioxide (NO 2 ). These compounds gas out of the etching solution and become entrained and exhausted with air used to ventilate the surface of the etching tank. Of the entire family, NO 2 has the worst environmental impact, causing acid rain and having an unsightly orange-brown color. U.S. EPA regulates total NO x emissions to < 20 tons/year in non-attainment zones and indirectly regulates NO 2 by limiting stac

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