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J Air Waste Manag Assoc

Title:		Understanding the effectiveness of precursor reductions in lowering 8-hr ozone concentrations
Author(s):		Reynolds SD; Blanchard CL; Ziman SD;
Address:		"Envair, San Rafael, California, USA. steve@sreynolds.com"
Journal Title:		J Air Waste Manag Assoc
Year:		2003
Volume:		53
Issue:		2
Page Number:		195 - 205
DOI:		10.1080/10473289.2003.10466143
ISSN/ISBN:		1096-2247 (Print) 1096-2247 (Linking)
Abstract:		"Analyses of ambient measured ozone data were used in conjunction with the application of photochemical modeling to determine the technical feasibility of attaining the federal 8-hr ozone standard in central California. Various combinations of volatile organic compound (VOC) and oxides of nitrogen (NOx) emission reductions were effective in lowering modeled peak 1-hr ozone concentrations. However, VOC emissions reductions were found to have only a modest impact on modeled peak 8-hr ozone concentrations. NOx emission reductions generally lowered 8-hr ozone concentrations, but their effectiveness was partially or, in some cases, wholly offset by the increase in the number of NO cycles and, hence, in the ozone produced per NO. As a result, substantial NOx emission reductions--70 to 90%--were required to reduce peak 8-hr ozone concentrations to the level of the standard throughout the modeling domain. These modeling results provide a possible physical explanation for recent analyses that have reported more prominent trends in peak 1-hr ozone levels than in peak 8-hr ozone concentrations or in occurrences of mid-level (60-90 parts per billion by volume) ozone concentrations. The findings also have serious implications for the feasibility of attaining the 8-hr ozone standard in central California. Further efforts are needed to clarify the applicability of the modeling results to the full set of days with ozone levels exceeding the 8-hr ozone standard, as well as their applicability to other geographical areas"
Keywords:		"Air Pollution/*prevention & control Environmental Monitoring Oxidants, Photochemical/*analysis Ozone/*analysis Periodicity Reference Values;"
Notes:		"MedlineReynolds, Steven D Blanchard, Charles L Ziman, Stephen D eng 2003/03/06 J Air Waste Manag Assoc. 2003 Feb; 53(2):195-205. doi: 10.1080/10473289.2003.10466143"