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. 2018 May 9;4(5):eaap8368. doi: 10.1126/sciadv.aap8368

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — (A and B) Aerosol mass spectrometer (AMS) species average contributions (A) and histogram of hourly I/O ratio (B) for all reported chemical species. Values less than 1 indicate loss from outdoor to indoor transport and weak or absent indoor sources, whereas values greater than 1 indicate a source in the indoor environment. Sulfate is a proxy for nonvolatile particle loss from outdoor to indoor transport. HOA, hydrocarbon-like organic aerosol; OOA, oxygenated organic aerosol; COA, cooking organic aerosol.