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Effect of Pellet Boiler Exhaust on Secondary Organic Aerosol Formation from α‑Pinene
Interactions
between anthropogenic and biogenic emissions, and
implications for aerosol production, have raised particular scientific
interest. Despite active research in this area, real anthropogenic
emission sources have not been exploited for anthropogenic-biogenic
interaction studies until now. This work examines these interactions
using α-pinene and pellet boiler emissions as a model test system.
The impact of pellet boiler emissions on secondary organic aerosol
(SOA) formation from α-pinene photo-oxidation was studied under
atmospherically relevant conditions in an environmental chamber. The
aim of this study was to identify which of the major pellet exhaust
components (including high nitrogen oxide (NO<sub><i>x</i></sub>), primary particles, or a combination of the two) affected
SOA formation from α-pinene. Results demonstrated that high
NO<sub><i>x</i></sub> concentrations emitted by the pellet
boiler reduced SOA yields from α-pinene, whereas the chemical
properties of the primary particles emitted by the pellet boiler had
no effect on observed SOA yields. The maximum SOA yield of α-pinene
in the presence of pellet boiler exhaust (under high-NO<sub><i>x</i></sub> conditions) was 18.7% and in the absence of pellet
boiler exhaust (under low-NO<sub><i>x</i></sub> conditions)
was 34.1%. The reduced SOA yield under high-NO<i><sub>x</sub></i> conditions was caused by changes in gas-phase chemistry
that led to the formation of organonitrate compounds