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

06/18/2007 06:41 PM

	

To

Lydia Wegman/RTP/USEPA/US@EPA

cc

Subject

secondary standard comment









Hi Lydia,

 

Here is some suggested text for the secondary standard section:

 

>>> pg. 12 of the updated RIA, to go as a last paragraph before section
iii. (crop yield loss):

 

"Another source of uncertainty has to do with positive fertilization
impacts on northern hemisphere forests of airborne nitrogen oxides from
anthropogenic sources.  It appears that little substantial work has yet
been done to analyze the offsetting benefits of such fertilization,
benefits which will be reduced as ozone precursors such as anthropogenic
nitrogen oxide emissions decline.  EPA views such research as an
important priority.  The Administrator seeks comment on how best to
balance the different effects of nitrogen oxides, directly and
indirectly (through ozone formation) on vegetation."

 

________________________________________________

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

 

