ARB Research Seminar

This page updated June 19, 2013

Investigation of Ambient NO₃ Radical Levels in the Los Angeles Air Basin During the SCOS97 Study

Photo of Janet Arey, Ph.D.

Janet Arey, Ph.D., Department of Environmental Sciences and Air Pollution Research Center, University of California, Riverside

August 09, 2002
Cal EPA Headquarters, 1001 "I" Street, Sacramento, CA

Research Project


The occurrence of ambient NO₃ radicals in the Los Angeles Air Basin during the 1997 Southern California Ozone Study (SCOS97-NARSTO) was investigated using the formation of nitronaphthalenes and methylnitronaphthalenes (MNNs) as a sensitive indicator of the presence of NO₃ radicals during nighttime. Naphthalene, 1- and 2-methylnaphthalene and biphenyl and their nitro-derivatives formed from atmospheric reactions (1- and 2-nitronaphthalene, the 14 MNNs and 3-nitrobiphenyl) were monitored in 12-hour daytime and 12-hour nighttime samples taken during the intensive sampling days of the SCOS97-NARSTO ozone study at three sites in the Los Angeles Air Basin, Azusa, Riverside and Banning.

Speaker Biography

Janet Arey has been at the Air Pollution Research Center at the University of California, Riverside since 1982 and has been a faculty member in the Department of Environmental Sciences and the Interdepartmental Graduate Program in Environmental Toxicology at UCR since 1990. She is the author or co-author of over 150 publications dealing with the atmospheric chemistry of organic compounds.

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