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Published 1991 | public
Journal Article

Aerosol formation in the photooxidation of isoprene and β-pinene


Isoprene and β-pinene, at concentration levels ranging from a few ppb to a few ppm, were reacted photochemically with NOₓ in the Caltech outdoor smog chamber facility. Aerosol formation from the isoprene photooxidation is found to be negligible even under extreme ambient conditions due to the relatively high vapor pressure of its products. Aerosol carbon yield from the β-pinene photooxidation is as high as 8% and depends strongly on the initial HC/NOₓ ratio. The average vapor pressure of the β-pinene aerosol is estimated to be 37 ± 24 ppt at 31 °C. Monoterpene photooxidation can be a significant source of secondary aerosol in rural environments and in urban areas with extended natural vegetation.

Additional Information

© 1991 Pergamon. First received 29 May 1990 and in final form 4 September 1990. This work was supported by a grant from the Ford Motor Company and National Science Foundation grant ATM-9003186.

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August 19, 2023
October 23, 2023