Development of a novel methodology for indoor emission source identification

K. H. Han, J. S. Zhang, H. N. Knudsen, P. Wargocki, H. Chen, P. K. Varshney, B. Guo

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The objective of this study was to develop and evaluate a methodology to identify individual sources of emissions based on the measurements of mixed air samples and the emission signatures of individual materials previously determined by Proton Transfer Reaction-Mass Spectrometry (PTR-MS), an on-line analytical device. The methodology based on signal processing principles was developed by employing the method of multiple regression least squares (MRLS) and a normalization technique. Samples of nine typical building materials were tested individually and in combination, including carpet, ceiling material, gypsum board, linoleum, two paints, polyolefine, PVC and wood. Volatile Organic Compound (VOC) emissions from each material were measured in a 50-liter small-scale chamber. Chamber air was sampled by PTR-MS to establish a database of emission signatures unique to each individual material. The same task was performed to measure combined emissions from material mixtures for the application and validation of the developed signal separation method. Results showed that the proposed method could identify the individual sources under laboratory conditions with two, three, five and seven materials present. Further experiments and investigation are needed for cases where the relative emission rates among different compounds may change over a long-term period.

Original languageEnglish (US)
Pages (from-to)3034-3045
Number of pages12
JournalAtmospheric Environment
Issue number18
StatePublished - Jun 2011


  • Material emission signature
  • PTR-MS
  • Signal processing
  • Source identification
  • VOC

ASJC Scopus subject areas

  • General Environmental Science
  • Atmospheric Science


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