INCREASING NITROGEN OXIDE EMISSION

NOx and the pollutants formed from NOx can be transported over long distances, following the pattern of prevailing winds in the U.S. This means that problems associated with NOx are not confined to areas where NOx are emitted. Therefore, controlling NOx is often most effective if done from a regional perspective, rather than focusing on sources in one local area.
Since 1970, EPA has tracked emissions of the six principal air pollutants - carbon monoxide, lead, nitrogen oxides, particulate matter, sulfur dioxide, and volatile organic compounds. Emissions of all of these pollutants have decreased significantly except for NOx which has increased approximately 10 percent over this period
Selective Catalytic Reduction (SCR) is a proven and effective method to reduce nitrogen oxides which is an air pollutant associated with the power generation process. Nitrogen oxides are a contributor to ground level ozone.

. SCR Systems work similar to a catalytic converter used to reduce automobile emissions. Prior to exhaust gases going up the smokestack, they will pass through the SCR System where anhydrous ammonia reacts with nitrogen oxide and converts it to nitrogen and water.