Comparison of H2O2 and O3 content in atmospheric samples in the San Bernardino mountains,Southern California |
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| Institution: | 1. Kitasato University School of Marine Biosciences, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan;2. Iwate Fisheries Technology Center, Kamaishi, Iwate 026-0001, Japan;3. King Abdullah University of Science and Technology (KAUST), Computational Bioscience Research Center, Thuwal 23955-6900, Saudi Arabia;2. Public Health and Clinical Medicine, Umeå University, Sweden;3. Pharmacology and Clinical Neuroscience, Umeå University, Umeå, Sweden;4. Clinical Sciences, Danderyd Hospital, Karolinska Institute, Stochholm, Sweden;1. Universidad Autónoma de Nayarit, Secretaría de Investigación y Posgrado, Laboratorio de Inmunotoxicología, Boulevard Tepic-Xalisco s/n. Cd, de la Cultura Amado Nervo, C.P. 63000 Tepic, Nayarit, Mexico;2. Centro Nayarita de Innovación y Transferencia de Tecnología A.C., Laboratorio Nacional para la Investigación en Inocuidad Alimentaria-Unidad Nayarit, Calle Tres s/n. Cd Industrial, Tepic, Nayarit, Mexico |
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| Abstract: | Concentrations of atmospheric H2O2 were measured in air, rain, cloud and dew samples in forested areas of the San Bernardino Mountains, southern California, from spring through fall of 1987–1990 O3 measurements in air were also conducted for comparison. Typical ranges of H2O2 concentrations measured were 1–3 ppb in air, 10–90 μM in rain and cloud water, and < μM in dew. The results show that gas-phase H2O2 concentrations were slightly higher at nighttime than at daytime or nearly constant throughout a 24-hr period, whereas O3 concentrations were highest during the afternoon, when polluted air masses from Los Angeles carried by daily sea breezes reached the mountain region. Afternoon concentrations of gaseous H2O2 and O3 in the mountain region were compared with those measured in Los Angeles urban sites to elucidate the regional variation of these oxidants. The results show that ambient concentrations of H2O2 and O3 were about 50–100% higher at the mountains sites than at the Los Angeles sites. |
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