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S1, supporting information) consisted of two cold traps chilled to 77 C using isopropyl alcohol and dry ice which were connected in series to two impingers filled with 20 mL of a 12.2 mM solution of dinitrophenylhydrazine (DNPH, purified by recrystallization) and 146 mM of phosphoric acid in 1:1 HPLC-grade water and HPLC-grade acetonitrile (Honeywell), as per the CORESTA standard method for carbonyl trapping

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would have several million fewer smokers if graphic warning labels similar to those introduced in Canada nearly a decade ago were required on cigarette packs, according to researchers at the University of Illinois at Chicago and the University of Waterloo

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Other studies that investigated longer term and more realistic test conditions note similar findings, with one study observing a substantial reduction in particle removal efficiency over a 19-week period of operation in an air handling unit that supplies outside air [19]