"King, Heidi R." <Heidi_R._King@omb.eop.gov> 

12/31/2007 10:24 AM

	

To

Lydia Wegman/RTP/USEPA/US@EPA

cc

Subject

RE: Response to 2 issues from teleconference with OMB on ozone NAAQS









Thank you! 

-----Original Message-----

From: Wegman.Lydia@epamail.epa.gov [mailto:Wegman.Lydia@epamail.epa.gov]

Sent: Friday, December 28, 2007 5:17 PM

To: King, Heidi R.

Subject: Re: Response to 2 issues from teleconference with OMB on ozone

NAAQS

Heidi, 

I don't know that we have anyone in on Monday who can work on responding

to your question, but we'll try to answer it by mid-next week.  I hope

that you and your famliy have a happy, healthy new year.

Lydia

----- Original Message -----

From: "King, Heidi R." [Heidi_R._King@omb.eop.gov]

Sent: 12/28/2007 03:24 PM EST

To: Lydia Wegman

Subject: RE: Response to 2 issues from teleconference with OMB on ozone

NAAQS

Thank you, Lydia.

We understood on our call that the 250 new studies could be summarized

as follows:

 

65 panel studies

75 Time series - morbidity

75 Time series - mortality

  5 Cohort studies - mortality

30 Cohort studies - morbidity

 

If this is correct, could your team provide further characterization of

group of 30 morbidity cohort studies - which studies are you referring

to here?

Thank you; I hope you had a good holiday and a Happy New Year to you and

yours --

Heidi

Heidi R. King

OMB/OIRA

(202) 395-4551

 

-----Original Message-----

From: Wegman.Lydia@epamail.epa.gov [mailto:Wegman.Lydia@epamail.epa.gov]

Sent: Thursday, December 20, 2007 6:03 PM

To: King, Heidi R.; Schwab, Margo; Johansson, Robert

Cc: richmond.harvey@epa.gov; martin.karen@epa.gov;

Crabtree.Tricia@epamail.epa.gov; wegman.lydia@epa.gov

Subject: Response to 2 issues from teleconference with OMB on ozone

NAAQS

Hi folks,

Please find Harvey and John's response to two questions you raised in

our last discussion about the ozone risk and exposure assessments.

----- Forwarded by Lydia Wegman/RTP/USEPA/US on 12/20/2007 06:01 PM

-----

                                                                        

             Harvey                                                     

             Richmond/RTP/USE                                           

             PA/US                                                   To 

                                      Lydia Wegman/RTP/USEPA/US@EPA     

             12/20/2007 05:52                                        cc 

             PM                       Rosalina                          

                                      Rodriguez/RTP/USEPA/US@EPA, Karen 

                                      Martin/RTP/USEPA/US@EPA, John     

                                      Langstaff/RTP/USEPA/US@EPA, Dave  

                                      Mckee/RTP/USEPA/US@EPA            

                                                                Subject 

                                      Re: response to 2 issues from     

                                      teleconference with OMB on ozone  

                                      NAAQS                             

                                                                        

                                                                        

                                                                        

                                                                        

                                                                        

                                                                        

 Lydia,

 Below are responses to 2 issues/questions raised by OMB.  These can be

forwarded to OMB.

 1.  Is there anything that the APEX exposure modeling output can tell

us about the relationship between the distribution of ambient

concentrations measured at the monitors and the distribution of personal

ozone exposures?

 Response: The exposure modeling performed (APEX) for ozone looked at

population distributions of exposure for each urban area and did not

provide information that can address the question raised about the

ratios of ambient concentrations to personal exposures for individuals

or populations living around each monitor in the urban area.

2.  Can you explain the difference between the ratio of 1.33 given in

the Rochester workgroup report relating 8-hr ozone and 24-hr ozone and

the ratio of about 2 given in the OAQPS Staff Paper?

Response:  The ratio discussed on p.35 of the Rochester report relates

to converting the average of 24-hr averages across all monitors in an

urban area to the average of 8-hr averages across all monitors in an

urban area.  In contrast, the ratio of about 2 discussed in the OAQPS

Staff Paper is relating the average of the 24-hr averages across all

monitors in an urban area with the 8-hr average at the highest monitor

within that same urban area.   Clearly, these are two very different

comparisons which are being done for different purposes.

Harvey

    Harvey M. Richmond

    Ambient Standards Group

    Health and Environmental Impacts Division

    U.S. EPA

    C504-06

    RTP, NC  27711

    (office) 919-541-5271

    (fax) 919-541-0237

    (email)  richmond.harvey@epa.gov

