Journal
ATMOSPHERIC ENVIRONMENT
Volume 42, Issue 35, Pages 8234-8245Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2008.07.031
Keywords
Secondary organic aerosol; Indoor air quality; Cleaning products; Terpenes; Ozone; Particle size distribution; Nucleation
Funding
- California Air Resources Board [01-336]
- National Science Foundation
- US DOE [DE-AC02-05CH11231]
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We analyzed secondary organic aerosol (SOA) data from a series of small-chamber experiments in which terpene-rich vapors from household products were combined with ozone under conditions analogous to product use indoors. Reagents were introduced into a continuously ventilated 198 L chamber at steady rates. Consistently, at the time of ozone introduction, nucleation occurred exhibiting similar behavior to atmospheric events. The initial nucleation burst and growth was followed by a period in which approximately stable particle levels were established, reflecting a balance between new particle formation, condensational growth, and removal by ventilation. Airborne particles were measured with a scanning mobility particle sizer (SMPS, 10-400 nm) in every experiment and with an optical particle counter (OPC, 0.1-2.0 mu m) in a subset. Parameters for a three-mode lognormal fit to the size distribution at steady state were determined for each experiment. Increasing the supply ozone level increased the steady-state mass concentration and yield of SOA from each product tested. Decreasing the air-exchange rate increased the yield. The steady-state fine-particle mass concentration (PM1.1) ranged from 10 to >300 mu g m(-3) and yields ranged from 5% to 37%. Steady-state nucleation rates and SOA mass formation rates were similar to 10 cm(-3) s(-1) and similar to 10 mu g m(-3) min(-1), respectively. (C) 2008 Elsevier Ltd. All rights reserved.
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