Author(s)

C.H. Song, M. Phadnis, Q.R. Carmichael, G.M. Underwood, T.M. Miller, E.T. Balster and V.H. Grassian

Abstract

Modelling heterogeneous reactions in air pollution models C.H. Song (^, M. Phadnis ^, Q.R. Carmichael C'^, G.M. Underwood ^\ T.M. Miller ®, E.T. Balster ™ and V.H. Grassian^^ * Center for Global and Regional Environmental Research ^Departments of Chemistry * Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA 1 Introduction Elevated levels of ambient ozone are recognized as a serious problem on urban, regional and global scales. The study of ambient ozone concentrations and trends is hampered by many factors including the lack of a long-term data base of ozone and its precursors, uncertainties in meteorological conditions associated with the production and accumulation of ozone, and an incomplete understanding of ozone photochemistry (Zurbenko et al, 1995). A fundamental factor is that ozone is not directly emitted but is formed by a complex set of photochemical reactions involving nonlinear interactions among NOx (NO% = NO + NO%), v

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