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

06/13/2007 03:38 PM

	

To

Lydia Wegman/RTP/USEPA/US@EPA

cc

Subject

FW: DOE comments









Hi Lydia,

 

Here is a comment/request from DOE for the preamble.

 

Cheers,

Rob

 

________________________________________________

Robert Johansson, Ph.D.

OMB/OIRA/NREA

725 17th St. NW, Room 10202

Washington, DC 20503

(P) 202-395-7873

(F) 202-395-7285

(E) RJohansson@omb.eop.gov

 

DOE also requests the following addition to the NPRM Preamble:

On pg. 180 of the Preamble, running over to page 181, after the number
(4), there are these words (in red):

 

        (4)     Much of the contribution to the risk estimates for
nonaccidental and cardiorespiratory mortality upon just meeting the
current 8-hour standard is associated with 24-hour O3 concentrations
between background and 0.040 ppm.  Based on examining relationships
between 24-hour concentrations averaged across the monitors within an
urban area and 8-hour daily maximum concentrations, 8-hour daily maximum
levels at the highest monitor in an urban area associated with these
averaged 24-hour levels are generally about twice as high.  Thus, most
O3-related nonaccidental mortality is estimated to occur when O3
concentrations are between background and when the highest monitor in
the urban area is at or below 0.080 ppm, 8-hour average concentration.

Please add the following words (in blue) immediately at the end of the
above passage:

Because most of the risk estimates for mortality are estimated to occur
between background and ozone levels of 0.040 ppm, levels of emissions of
ozone and of ozone precursors which enter the U.S. from bordering
neighbor countries may be important contributors to these risks during
the ozone season.  The Administrator seeks comments on this subject,
including levels and percentages of ozone when ozone levels are 0.040
ppm or below, in order to better quantify risks from U.S. sources.  

For questions about these comments, please call Thomas Grahame at
586-7149.

