Secondary organic aerosol from ozone-initiated reactions with terpene-rich household products Page: 2 of 31
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Keywords: secondary organic aerosol, cleaning products, indoor air quality, terpenes, limonene,
ozone, size distribution, nucleation, condensation
1. Introduction
Terpenes and ozone are commonly present indoors, and their reactions can produce
particles (Weschler and Shields, 1999; Long et al., 2000; Wainman et al., 2000; Sarwar et al.,
2004; Liu et al., 2004). Consumer products, such as cleaning agents and air fresheners, are
common sources of terpenes (Nazaroff and Weschler, 2004). Ozone is routinely present indoors
because of ventilation with ozone-containing outdoor air (Weschler, 2000).
Particle inhalation raises health concerns (Pope and Dockery, 2006). Deposition in the
lungs is size-dependent (Yeh et al., 1996; Asgharian and Price, 2007), and the health effects
associated with aerosol exposure depend on particle size and concentration (Oberdorster, 2001;
Peters et al., 1997). The exposure impacts of indoor pollutants are amplified because (a) people
spend a high proportion of their time indoors, (b) emissions that occur indoors are diluted into
confined volumes and removed at slow ventilation rates, and (c) people tend to be in close
proximity to indoor pollutant sources (Nazaroff, 2008). Consequently, it is important to
characterize both the source strength and size distribution of significant indoor particle sources.
Secondary organic aerosol (SOA) formation from ozone-terpene interactions has been
widely studied in relation to atmospheric organic aerosol formation. Those studies have
uncertain direct applicability for elucidating SOA formation indoors. Several studies have
measured SOA formation and growth from ozone reactions with pure terpenes or with terpene-
containing products under indoor-relevant conditions. Most of these studies measured particles
using an optical particle counter (Weschler and Shields, 1999; Wainman et al., 2000; Weschler
and Shields, 2003; Sarwar et al., 2003; Sarwar et al., 2004; Hubbard et al., 2005; Singer et al.,2
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Coleman, Beverly; Coleman, Beverly K.; Lunden, Melissa M.; Destaillats, Hugo & Nazaroff, William W. Secondary organic aerosol from ozone-initiated reactions with terpene-rich household products, article, January 1, 2008; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc895410/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.