Document ID: EPA-HQ-OAR-2007-0225-0237
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2008-03-12T04:00Z

"Johansson, Robert" <Robert_C._Johansson@omb.eop.gov> 

10/01/2007 10:48 AM

	

To

Ron Evans/RTP/USEPA/US@EPA

cc

Subject

RE: RESEND:  SAB letter on extrapolated costs

Can you provide the context for this letter?  It appears as though the

questions were being posed for previous rulemakings; i.e., what was the

ozone naaqs std being modeled in the background review document?  

"The Project Team has been unable to identify measures that yield

sufficient emission

reductions to comply with the National Ambient Air Quality Standards

(NAAQS) and relies on

unidentified pollution control measures to make up the difference.

Emission reductions attributed to

unidentified measures appear to account for a large share of emission

reductions required for a few

large metropolitan areas but a relatively small share of emission

reductions in other locations and

nationwide."

Which naaqs and levels does this refer to?

Rob