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Combing Measurements from Mobile Monitoring and a Reference Site to Develop Models of Ambient Ultrafine Particle Number Concentration at Residences

Simon, M, Patton, A, Naumova, E, Levy, J, Kumar, Prashant, Brugge, D and Durant, J (2018) Combing Measurements from Mobile Monitoring and a Reference Site to Develop Models of Ambient Ultrafine Particle Number Concentration at Residences Environmental Science & Technology, 52 (12). pp. 6985-6995.

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Abstract

Significant spatial and temporal variation in ultrafine particle (UFP; <100 nanometers in diameter) concentrations creates challenges in developing predictive models for epidemiological investigations. We compared the performance of land-use regression models built by combining mobile and stationary measurements (hybrid model) with a regression model built using mobile measurements only (mobile model) in Chelsea and Boston, MA (USA). In each study area, particle number concentration (PNC; a proxy for UFP) was measured at a stationary reference site and with a mobile laboratory driven along a fixed route during a ~1-year monitoring period. In comparing PNC measured at 20 residences and PNC estimates from hybrid and mobile models, the hybrid model showed higher Pearson correlations of natural log-transformed PNC (r=0.73 vs. 0.51 in Chelsea; r=0.74 vs. 0.47 in Boston) and lower root35 mean-square error in Chelsea (0.61 vs. 0.72) but no benefit in Boston (0.72 vs. 0.71). All models over36 predicted log-transformed PNC by 3-6% at residences, yet the hybrid model reduced the standard deviation of the residuals by 15% in Chelsea and 31% in Boston with better tracking of overnight decreases in PNC. Overall, the hybrid model considerably outperformed the mobile model and could offer reduced exposure error for UFP epidemiology.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Simon, M
Patton, A
Naumova, E
Levy, J
Kumar, PrashantP.Kumar@surrey.ac.uk
Brugge, D
Durant, J
Date : 15 May 2018
DOI : 10.1021/acs.est.8b00292
Copyright Disclaimer : Copyright 2018 American Chemical Society
Depositing User : Melanie Hughes
Date Deposited : 16 May 2018 14:49
Last Modified : 15 May 2019 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/846431

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