Impacts of natural ventilation on gas and particle phase organic compounds indoors: Insights from chromatogram binning - Positive matrix factorization analysis

Gas- and particle-phase organic compounds were measured during a two-week period at a single-family home in St. Louis during the Air Composition and Reactivity from Outdoor aNd Indoor Mixing (ACRONIM) campaign, with a focus on the effects of window opening on indoor air quality. The organic aerosol (OA) measurements were conducted with a thermal desorption aerosol gas chromatograph (TAG), which provides in-situ, hourly measurements of speciated organic compounds. Volatile organic compounds (VOCs) were collected onto sorption tubes and quantified offline by thermal desorption - gas chromatography - mass spectrometry (TD-GC-MS). A newly developed chromatogram binning - positive matrix factorization (CB-PMF) analysis technique of these GC-MS datasets successfully grouped classes of compounds into distinct factors, and provided evidence that window opening resulted in indoor OA more closely resembling OA found outdoors.