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INDOOR-OUTDOOR RELATIONSHIPS OF PARTICLES, PAH, AND BLACK CARBON IN AN OCCUPIED TOWNHOUSE
Citation:
Wallace, L A. AND C HowardReed. INDOOR-OUTDOOR RELATIONSHIPS OF PARTICLES, PAH, AND BLACK CARBON IN AN OCCUPIED TOWNHOUSE. Presented at American Association of Aerosol Research, Tacoma, WA, October 11-15, 1999.
Description:
Real-time instrumentation for measuring particles, PAH, and black carbon (soot) has been operated since May of 1998 in an occupied 3-story town house in Reston, VA. Indoor and outdoor concentrations have been measured every five minutes for the particles and black carbon and every minute for the PAR Temperature and relative humidity are measured every five minutes. Air exchange measurements utilizing SF6 as a tracer have been made on an intermittent basis (about 50 days during the year). A log of relevant activities was maintained to identify important sources. Important outdoor sources of PAH and black carbon were vehicle exhaust (morning rush hour only) and woodsmoke, although neither source was an important contributor to total particle concentrations. Indoor sources included candles, incense, and some types of cooking. Cooking also produced both fine and coarse particles. Physical activities produced mostly coarse particles. Profiles of particle size distributions and estimated source strengths were produced for a dozen or so common activities. In conjunction with the air exchange measurements, indoor particle deposition rates were determined for six size fractions between 0.3 and >10 micrometers in diameter. Indoor-outdoor correlations were very low for the coarse particles but were higher for the other target pollutants.
This research was sponsored by the U. S. Environmental Protection Agency. This abstract has been reviewed and approved by the Agency, but is not necessarily reflective of Agency policy.