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RE: Ozone precursors



Almost all organic solvents are consider photochemically reactive at ground 
level.  The specific compounds not reactive are listed in the VOC 
definition:
Web address = 
http://frwebgate.access.gpo.gov/cgi-bin/get-cfr.cgi?TITLE=40&PART=51&SEC  
TION=100&YEAR=1999&TYPE=TEXT
Pargraph "s".
VOC's are defined by what is excluded.
Common solvents that are VOCs and DO contribute to smog are 
trichloroethylene, MEK, Xylene, Toluene etc.

Common solvents that do NOT contribute to smog are  methylene chloride, 
perchloroethylene and acetone



-----Original Message-----
From:	Dave Foulkes [SMTP:Dave.Foulkes@epa.state.oh.us]
Sent:	Friday, June 09, 2000 8:11 AM
To:	P2tech@great-lakes.net
Subject:	Ozone precursors

At ground level, ozone (O3) is formed by a series of reactions, including 
sunlight, involving VOCs combining with NOx. VOC and NOx are called ozone 
precursors.
Does anyone know what solvent cleaners/degreasers are considered ozone 
precursors and photochemically reactive for forming ground level ozone?
Thanks,



David A. Foulkes, Environmental Specialist
State of Ohio EPA
Office of Pollution Prevention
P.O. Box 1049
Columbus, OH  43216-1049
(614) 644-3118
email:  dave.foulkes@epa.state.oh.us
World Wide Web:  http://www.epa.state.oh.us/opp