A220-0016
Source Apportionment of Black Carbon in Residential Environment Using Portable Multi-wavelength Aethalometers at Peri-urban and Urban Beijing

Wednesday, 16 December 2020
Poster
Hanbin Zhang1, Yunfei Fan2, Yiqun HAN3, Li Yan1, Bingling Zhou1, Wu Chen2, Queenie Chen1, Tong Zhu2, Frank Kelly1 and Benjamin Barratt1, (1)Imperial College London, MRC-PHE Centre for Environment and Health, NIHR HPRU in Health Impact of Environmental Hazards, London, United Kingdom, (2)Peking University, State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Beijing, China, (3)Imperial College London, MRC-PHE Centre for Environment and Health, NIHR HPRU in Health Impact of Environmental Hazards, London, SW7, United Kingdom
Abstract:
Background Black carbon (BC) in residential setting can be from different sources, mostly biomass burning and traffic. Arising from different activities and sources, BC may have different toxicities, health effects, control mechanisms and thus should be intervened separately. Although techniques for source apportionment of BC measurements from multi-wavelength aethalometer has been well developed in the atmospheric environment, it has not been adapted for either the recent portable aethalometers, or indoors with a panel of residences. We aimed to evaluate and compare the source differences in black carbon among peri-urban and urban residences in Beijing.

Methods 72 occupied residences of participants were selected for the residential monitoring of BC (MA300/350, AethLabs, USA) for 72 hours in peri-urban and urban Beijing during winter 2016 and summer 2017. Loading effect correction, smoothing algorithm, precision and accuracy calibration were applied where appropriate before analysis. UVPM (also called Delta-C), which is the ultraviolet-absorbing particulate matter, and angstrom exponents were calculated for all residences, using the BC measurements at 470nm and 880nm.

Preliminary results The calculated UVPM were 6.08 ± 4.89 µg/m3 during winter and 2.23 ± 1.52 µg/m3 during summer for peri-urban residences (n = 31 and 19), 3.88 ± 1.93 µg/m3 during winter and 1.44 ± 0.83 µg/m3 during summer for urban residences (n = 34 and 29). Significantly higher UVPM values were found in peri-urban than urban residences during summer (p < 0.05), but not winter (p > 0.05). The calculated angstrom exponents were 1.99 ± 0.24 during winter, and 2.21 ± 0.25 during summer for peri-urban residences (n = 31 and 19), 2.01 ± 0.21 during winter and 1.95 ± 0.29 during summer for urban residences (n = 34 and 29). Source apportionment is ongoing for the study panel and will be completed before December 2020.

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