On the Contribution of Biomass Burning to POPs (PAHs and PCDDs) in Air in Africa

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Authors

LAMMEL Gerhard HEIL A. STEMMLER I. DVORSKÁ Alice KLÁNOVÁ Jana

Year of publication 2013
Type Article in Periodical
Magazine / Source ENVIRONMENTAL SCIENCE & TECHNOLOGY
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1021/es401499q
Field Air pollution and control
Keywords POLYCYCLIC AROMATIC-HYDROCARBONS; DIBENZO-P-DIOXINS; PERSISTENT ORGANIC POLLUTANTS; AEROSOL-CLIMATE MODEL; SOUTH ATLANTIC TRANSECT; EMISSION FACTORS; HETEROGENEOUS REACTIVITY; ASSIMILATION SYSTEM; FOREST; FIRE
Description Forest, savannah, and agricultural fires in the tropics and subtropics are sources for widespread pollution and release many organic substances into the air and soil, including persistent organic pollutants, i.e., polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and polycyclic aromatic hydrocarbons (PAHs). The significance of this source for the exposure of humans and the environment in Africa toward phenanthrene, fluoranthene, pyrene, benzo(a)-pyrene, 2,3,7,8-tetrachlorodibenzo-p-dioxin, 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin, and octa-chlorodibenzo-p-dioxin is studied using daily global emissions from vegetation fires observed by satellite and a global multicompartment chemistry-transport model. Near-ground atmospheric concentrations of model-predicted vegetation fire related concentrations of PAHs and PCDDs were in the 10-1000 and 10(-5)-10(-3) pg m(-3) ranges, respectively. Vegetation fires in Africa are found to emit 180 +/- 25 kg yr(-1) of PCDD/Fs. By comparison with observations, it is found that fires explain 1-10% of the PCDD (5% of 2,3,7,8-tetrachlorodibenzo-p-dioxin) concentrations in the rural and background atmosphere of sub-Saharan Africa. The contribution of vegetation fires to exposure to PAH is probably >10%, but cannot be quantified due to lack of knowledge with regard to both emission factors and photochemistry. A sensitivity analysis suggests that the heterogeneous reaction of PAHs with ozone is effectively limiting atmospheric lifetime and long-range transport.
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