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Temporal and Spatial Variation of Physical and Chemical Properties in PM2.5 and PM1.0 and Their Influence on Atmospheric Visibility

Professor Ta-Chih Hsiao, Graduate Institute of Environmental Engineering (GIEE)

The atmospheric visibility is directly related to the light absorbing and scattering by aerosol particles, which is depending on PM’s physical and chemical properties and vary significantly in space and time. It is thus of great importance to explore the relationship between these physiochemical parameters and their influences on the light extinction. Urban development would reshape the terrain features and landscapes in Taichung, and it could intensify urban heat island effect and further result in changes of the chemical composition of air pollutants. All the above would enable us to understand aerosol’s impact on atmospheric visibility and to mitigate the impairment.

In this project, field observations and various measurements will be performed at two different locations in Taichung metropolitan and suburban areas. The Metropolitan station is selected to investigate the contributions of traffic emissions, and the suburban station in Taichung is selected to study the pollution transport. The first phase of the project has been completed, and the two identical experimental setups were installed in the two stations. The on-site calibrations were conducted for the instruments, including TEOM, nephelometer, aethalometer, SMPS etc. The hourly data sets of the two identical instruments in the same station are well correlated with each other and demonstrated the comparability and reliability of the data. In addition to continuous monitoring of aerosol physical properties, the seasonal intensive observations on aerosol chemical properties are conducted.