These years were selected to analyze changes coinciding with the period of NOx reductions attributable to the Acid Rain Program (1990), the Ozone Transport Commission (OTC) NOx Budget Program (1999 through 2002), and the implementation of the NOx SIP Call (starting in 2003 in eight states and in 2004 in 11 additional states).
L’EPA pense qu’avec l’application de ces programmes, les émissions de NOx et de COV continueront de s’abaisser.