Evaluation Of A Revised Emission Inventory In
The Metropolitan Area Of Sao Paulo, Brazil,
Based On A Photochemical Model Approach
Author(s)
M. G. Vivanco & M. de Fátima Andrade
Abstract
Photochemical air pollution has become an important problem in the
Metropolitan Area of Sao Paulo (MASP) over the past years. Approximately,
90% of the ozone precursors are emitted to the atmosphere by vehicular fleet.
The estimation of precursors emissions, especially those from motor vehicles, is
a rather complex task and it represents the major source of uncertainty. Ethanol
represents about 32% of the fuel used in the light fleet vehicles.
In this study, a validation of the nonmethane organic gases (NMOG) and
x NO official emissions has been performed, using an observation-based
approach. The x NO /CO and NMOG/CO ratios were calculated from earlymorning
(0700 to 0800) ambient measurements taken in July and August, 1999.
This approach assumes that early morning ambient concentrations of
Keywords
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