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RE: Ozone precursors



The link I gave previously does not appear to work.
Instead go to: 
http://www.access.gpo.gov/nara/cfr/waisidx_99/40cfr51_99.html

Open either the text or PDF file associated with part 51.100 definitions,
Then go to pargraph "s". for the VOC definition

The other related issue is how much of a VOC is released into the 
atmosphere to generate smog.  This depends on the procedures used and care 
with which they are followed, the tightness of equipment used, and the 
volatility of the chemical.  The higher the boiling point, the less they 
will tend to evaporate.  Some solvents like MEK are almost guaranteed to 
evaporate entirely, while at the other extreme many oils are for practical 
purposes non-volatile.  Unless they are atomized or left open for very long 
periods, they won't significantly contribute to smog even though they are 
by definition VOCs.
-----Original Message-----
From:	Karl DeWahl [SMTP:dewah001@tc.umn.edu]
Sent:	Friday, June 09, 2000 9:12 AM
To:	P2tech(response) (E-mail)
Subject:	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
TION0&YEAR99&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