Air Qualtiy Modeling at Coarse-to-Fine Scales in Urban Areas

摘要

Many air toxic pollutants are photo chemically active$ their ambient concentration levels will, therefore, depend on both the magnitude of the secondary products from the inflow regional background as well as from fresh emissions. In principle, the Community Multi-scale Air Quality (CMAQ) modeling system with its multi-scale modeling attributes can provide the ambient concentrations of air toxics from both regional and local sources and through advanced treatment of chemical, transport and deposition pathways. This paper explores the CMAQ capability to provide adequate temporal information and regional to fine scales spatial detail of air toxics concentration fields to support community exposure and risk-based modeling with emphasis of assessments of urban areas that experience high air toxic concentration levels, the so-called hot-spots.