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Berkeley study shows ozone and nicotine a bad combination for asthma
Date:8/16/2010

r aerosols through a reaction with ozone."

To identify the products formed when nicotine in secondhand smoke is reacted with ozone, Sleiman and his co-authors utilized the unique capabilities of Berkeley Lab's Advanced Light Source (ALS), a premier source of x-ray and ultraviolet light for scientific research. Working at ALS Beamline 9.0., which is optimized for the study of chemical dynamics using vacuum ultraviolet (VUV) light and features an aerosol chemistry experimental station, the researchers found new chemical compounds forming within one hour after the start of the reaction.

"The tunable VUV light of Beamline 9.0.2's custom-built VUV aerosol mass spectrometer minimized the fragmentation of organic molecules and enabled us to chemically characterize the secondhand smoke and identify individual constituents of secondary organic aerosols," says Sleiman. "The identification of multifunctional compounds, such as carbonyls and amines, present in the ultrafine particles, made it possible for us to estimate the Asthma Hazard Index for these compounds."

While the findings in this study support recommendations from the California EPA and the Air Resources Board that discourage the use of ozone-generating "air purifiers," which among other applications, have been used for the removal of tobacco odors, the Berkeley Lab researchers caution that the levels of both ozone and nicotine in their study were at the high end of typical indoor conditions.

Says Sleiman, "In addition, we need to do further investigations to verify that the formation of ultrafine particles occurs under a range of real world conditions. However, given the high levels of nicotine measured indoors when smoking takes place regularly and the significant yield of ultrafine particles formation in our study, our findings suggest new link between asthma and exposure to secondhand and thirdhand smoke."


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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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