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Contribution of Biomass Burning to Ambient Particulate Polycyclic Aromatic Hydrocarbons at a Regional Background Site in East China
journal contribution
posted on 2018-01-30, 00:00 authored by Shuduan Mao, Jun Li, Zhineng Cheng, Guangcai Zhong, Kechang Li, Xiang Liu, Gan ZhangBiomass
burning has a significant impact on regional air quality,
public health, and climate change. It is an important source of particulate
polycyclic aromatic hydrocarbons (PAHs), which make up a major class
of toxic air pollutants. To estimate the contribution of biomass burning
to ambient particulate PAH concentrations, 15 PAHs and three anhydrosugars
(levoglucosan, galactosan, and mannosan) were analyzed in particulate
samples collected at a background site in east China from August 2012
to August 2015. Higher concentrations of all species were observed
in fall and winter. Indoor biofuel combustion in north China was considered
to be the major contributor to the high concentrations of anhydrosugars
in fall and winter, because there were few fires detected on a fire
count map for this period. A tracer-based approach, using the ratio
of PAHs to levoglucosan (PAHs/lev) in fresh biomass burning aerosols,
was proposed and used to estimate the contribution of biomass burning
to PAHs. The results showed that biomass burning contributed nearly
11% of the total particulate PAHs. The estimation of the contribution
from biomass burning using PAHs/lev agreed well with the results obtained
from an independent positive matrix factorization analysis.
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background siteclimate changeEast China BiomassAmbient Particulate Polycyclic Aromatic Hydrocarbonsair qualitytracer-based approachAugust 2012air pollutants15 PAHsfire count mapIndoor biofuel combustionAugust 2015.Regional Background SitePAH concentrationsmatrix factorization analysiscontributionbiomas
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