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.
In 2005, the prices of NOx RTCs fluctuated between a minimum of $1,200 per ton for those from 2004, to a maximum of $9,730 per ton for those from 2008, to $10,193 per ton for those from 2010, and eventually settled at approximately $9,800 per ton for those from 2010 onwards.