A review of NO[sub x] control technologies for stationary sources

Nitrogen oxide (NOx) emissions, regulated federally since 1970 under CAA's new source performance standards, are subject to increased regulation under the CAA Amendments. Title 1 of the Amendments, the non-attainment provisions, establishes guidance for controlling numerous pollutants, including VOCs and NOx, both ozone precursors. Under Title 1, states must promulgate reasonably available control technology (RACT) standards, based on EPA guidelines, to make progress toward achieving required air quality standards. Title 1 regulations are expected to be stringent, and all major emissions sources will be subject to regulation. EPA in 1990 estimated that electric utilities account for 60% of stationary-source NOx emissions, while the industrial sector is responsible for 27%. To date, regulations proposed by regional authorities set emissions limits below new source performance standards and the Amendments' Title IV standards.