"Morandi, Maria T" <Maria.T.Morandi@uth.tmc.edu> 

03/04/2007 10:04 PM

	

To

Fred Butterfield/DC/USEPA/US@EPA

cc

Subject

Ozone Staff Paper









Hi, Fred:

Sorry, but I rpobably will not be able to participate tomorrow. If I
can, I will call and participate part of the time

The current version of the Staff Paper represents a significant
improvement over the first draft. In general, the staff was responsive
to the major concerns of the Panel, foremost among them the
inconsistency between the scientific evidence for health effects of
ozone observed at levels below the current primary standard that are
described in the draft AQDR and summarized in the Staff Paper, and the
recommendation for maintaining the current primary standard.  

I have some concern with the description of the upper bound of the
recommended range for arevised primary as a “…range of somewhat
below 0.080 ppm .to 0.060 ppm..” in multiple areas of Chapter 6. Since
the Staff Paper risk scenarios  include the 0.074, 0.070, and 0.064 as
representative levels of the recommended range  it would strengthen the
recommendation to provide a value for the upper bound of the range (say
0.074) as it is done for the lower bound (0.060 ppm). 

Maria

