Emission rates for nitrogen oxides during the 2011 and 2012 ozone seasons reverted to essentially what they had been prior to SCR start up in 2003, resulting in the release of approximately 9,000 additional tons of  per season over what could have been achieved with full operation of this pollution control technology.
Emission rates for nitrogen oxides during the 2011 and 2012 ozone seasons returned to pre-SCR start-up levels in 2003, causing an additional release of around 9,000 tons per season compared to full operation of this pollution control technology.