During 2005, NOx RTC average prices ranged from a low of $1,200 per ton for the Compliance Year 2004 RTCs,  to $9,730 per ton for Compliance Year 2008 NOx RTCs, to $10,193 per ton of NOx RTCs for Compliance Years 2010, and leveled off at around $9,800 per ton for RTCs valid for Compliance Years 2010 and beyond.
During 2005, NOx RTC prices ranged from a low of $1,200 per ton for 2004 models, to a high of $9,730 per ton for 2008 models, to $10,193 per ton for 2010 models, and stabilized at around $9,800 per ton for subsequent years.