2 April - June 2015
3D Photochemical Dispersion Models for Secondary Air
Pollutant Study: from Input Data Preparation to Model
Environmental Science Program, School of Engineering and Resources, Walailak University
*Correspondent author: email@example.com
Secondary air pollutants are formed through series of complex reactions occurred in
the atmosphere under favorable meteorological conditions. Commonly known species are
ozone and secondary aerosols, secondary inorganic and organic aerosols. Through its
complexity, varieties of three dimensional (3D) photochemical dispersion models have
been developed globally to simulate formations and dispersions of the secondary as well
as the primary pollutants in the atmosphere. CMAQ and CAMx are the state of the science
models under “one atmospheric approach”, noncommercial and open-source software.
These characteristics are attracted and challenged for future air quality management via
model simulations. Applications of CMAQ and CAMx are normally based on several steps:
preparation of emission input, modeling set-up and model performance evaluation.
This article presents the systematic procedures involved with the use of 3D photochemical
models starting from theoretical principles for formation of secondary air pollutants, types
of photochemical models and its associated physical and chemical modules, input data
preparation including reviews on available emission inventories and lastly statistical
methods for model performance evaluation.
Keywords: 3D photochemical model, secondary air pollutants, emission input, model