The impact of day-old dilute smog on fresh smog systems: An outdoor chamber study |
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| Affiliation: | 1. Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, P. O. Box 14115-143, Tehran, Iran;2. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology (ICST), P. O. Box 16765-654, Tehran, Iran;1. Institute of Polymer Materials, Faculty of Materials Science and Applied Chemistry, Riga Technical University, P. Valdena 3/7, Riga, LV-1048, Latvia;2. Institute of Materials and Surface Engineering, Faculty of Materials Science and Applied Chemistry, P.Valdena 3/7, LV-1048, Riga, Latvia;1. School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, Pulau Pinang, Malaysia;2. Rock Mechanics and Hydro-geology Group, Kajima Technical Research Institute, Kajima Corporation, Japan;3. Kajima Technical Research Institute Singapore, Kajima Corporation, Singapore;1. University of Novi Sad, Faculty of Sciences, Department of Biology and Ecology, Laboratory for Ecotoxicology, Novi Sad, Serbia;2. University of Novi Sad, Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, Novi Sad, Serbia |
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| Abstract: | The effect of dilute day-old smog on fresh smog systems was studied in the UNC dual outdoor chamber. Smog systems which contained fresh smog precursors plus dilute residuals from the day before (0.04 ppm O3, 0.1–0.3 ppm NMHC and 0.1 ppmC aldehydes) produced almost twice the ozone as fresh systems which had the same initial NMHC and NOx injections. It is hypothesized that as much as 15–25% of this O3 increase is due to residual first day aldehydes and that the remaining increase results from an increased morning percentage of NO2 and the extra residual paraffinic hydrocarbons. The combined interactive effect of changes in initial aldehydes to NO2 and aged paraffins appears to be greater than if each of these are considered separately. |
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