Investigating the Sources of Urban Air Pollution Using Low-Cost Air Quality Sensors at an Urban Atlanta SiteClick to copy article linkArticle link copied!
- Laura Hyesung YangLaura Hyesung YangSchool of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesMore by Laura Hyesung Yang
- David H. Hagan
- Jean C. Rivera-RiosJean C. Rivera-RiosSchool of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesMore by Jean C. Rivera-Rios
- Makoto M. KelpMakoto M. KelpDepartment of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, United StatesMore by Makoto M. Kelp
- Eben S. Cross
- Yuyang PengYuyang PengSchool of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesMore by Yuyang Peng
- Jennifer KaiserJennifer KaiserSchool of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesSchool of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesMore by Jennifer Kaiser
- Leah R. WilliamsLeah R. WilliamsAerodyne Research, Inc., Billerica, Massachusetts 01821, United StatesMore by Leah R. Williams
- Philip L. CroteauPhilip L. CroteauAerodyne Research, Inc., Billerica, Massachusetts 01821, United StatesMore by Philip L. Croteau
- John T. JayneJohn T. JayneAerodyne Research, Inc., Billerica, Massachusetts 01821, United StatesMore by John T. Jayne
- Nga Lee Ng*Nga Lee Ng*Email: [email protected]School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesSchool of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesSchool of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesMore by Nga Lee Ng
Abstract
Advances in low-cost sensors (LCS) for monitoring air quality have opened new opportunities to characterize air quality in finer spatial and temporal resolutions. In this study, we deployed LCS that measure both gas (CO, NO, NO2, and O3) and particle concentrations and co-located research-grade instruments in Atlanta, GA, to investigate the capability of LCS in resolving air pollutant sources using non-negative matrix factorization (NMF) in a moderately polluted urban area. We provide a comparison of applying the NMF technique to both normalized and non-normalized data sets. We identify four factors with different temporal trends and properties for both normalized and non-normalized data sets. Both normalized and non-normalized LCS data sets can resolve primary organic aerosol (POA) factors identified from research-grade instruments. However, applying normalization provides factors with more diverse compositions and can resolve secondary organic aerosol (SOA). Results from this study demonstrate that LCS not only can be used to provide basic mass concentration information but also can be used for in-depth source apportionment studies even in an urban setting with complex pollution mixtures and relatively low aerosol loadings.
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