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RE: Ozone precursors
The link I gave previously does not appear to work.
Instead go to:
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.
From: Karl DeWahl [SMTP:firstname.lastname@example.org]
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
Web address =
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
From: Dave Foulkes [SMTP:Dave.Foulkes@epa.state.oh.us]
Sent: Friday, June 09, 2000 8:11 AM
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
Does anyone know what solvent cleaners/degreasers are considered ozone
precursors and photochemically reactive for forming ground level ozone?
David A. Foulkes, Environmental Specialist
State of Ohio EPA
Office of Pollution Prevention
P.O. Box 1049
Columbus, OH 43216-1049
World Wide Web: http://www.epa.state.oh.us/opp