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Characteristics and source apportionment of Black Carbon (BC) in a suburban area of Klang Valley, Malaysia


Ezani, Nur Eliani and Dhandapani, Sairam and Heal, Mathew R. and Praveena, Sarva Mangala and Khan, Md Firoz and Ramly, Zamzam T. A. (2021) Characteristics and source apportionment of Black Carbon (BC) in a suburban area of Klang Valley, Malaysia. Atmosphere, 12 (6). art. no. 784. pp. 1-11. ISSN 2073-4433


Black carbon (BC) is of concern due to its contribution to poor air quality and its adverse effects human health. We carried out the first real-time monitoring of BC in Malaysia using an AE33 Aethalometer. Measurements were conducted between 1 January and 31 May 2020 in a university area in a suburban location of the Klang Valley. The measurement period coincided with the implementation of a movement control order (MCO) in response to COVID-19. The mean concentration of BC before the MCO was 2.34 µg/m3 which decreased by 38% to 1.45 µg/m3 during the MCO. The BC is dominated by fossil-fuel sources (mean proportion BCff = 79%). During the MCO, the BCff concentration decreased by more than the BCbb concentration derived from biomass burning. BC and BCff show very strong diurnal cycles, which also show some weekday–weekend differences, with maxima during the night and just before noon, and minima in the afternoon. These patterns indicate strong influences on concentrations from both traffic emissions and boundary layer depth. BC was strongly correlated with NO2 (R = 0.71), another marker of traffic emission, but less strongly with PM2.5 (R = 0.52). The BC absorption Ångström exponent (AAE) ranged between 1.1 and 1.6. We observed pronounced diurnal cycles of lower AAE in daytime, corresponding to BCff contributions from traffic. Average AAE also showed a pronounced increase during the MCO. Our data provides a new reference for BC in suburban Malaysia for the public and policy-makers, and a baseline for future measurements.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Medicine and Health Science
Faculty of Forestry and Environment
DOI Number: https://doi.org/10.3390/atmos12060784
Publisher: Multidisciplinary Digital Publishing Institute
Keywords: Black carbon; Carbonaceous aerosol; Human health; Aethalometer; Fossil fuel; Biomass burning
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 30 Jan 2023 06:53
Last Modified: 30 Jan 2023 06:53
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/atmos12060784
URI: http://psasir.upm.edu.my/id/eprint/96345
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