I focus my research on environmental health. I study the characteristics and sources of ambient air pollution, focusing on PM2.5 and its chemicals. Knowing the components of PM2.5, I apply the source apportionment model to identify the contributors and their contribution quantity. At the same time, I also explore how air pollution from different sources influences human health. Although
Ngo T. H., Yang Y.H., Chen Y.C., Pan W.C., Chi K.H.*, Continuous nationwide atmospheric PCDD/F monitoring network in Taiwan (2006–2016): Variation in concentrations and apportionment of emission sources. Chemosphere 255, 126979 (2020).
Ngo T. H., Tsai P.C., Ueng Y.F. and Chi K.H.*, Cytotoxicity Assessment of PM2.5 Collected from Specific Anthropogenic Activities in Taiwan. International Journal of Environmental Research and Public Health, 16 (24). (2019)
Ngo, T. H., Hsu, W.T., Chi, K.H.*, Evaluation of the Relative Health Risk Impact of Atmospheric PCDD/Fs in PM2.5 in Taiwan. Aerosol and Air Quality Research, 18: 2591–2599, 2018.
Ngo, T. H., Tsou, H. H., Chen, Y. F., Chen, Y. W. and Chi, K. H.*, Sources Identification of PCDD/Fs in Soil and Atmospheric Deposition in Taiwan. Chemosphere 208, 374-381 (2018).
Chi, K. H.*, Li, Y. N. and Ngo, T. H., Spatial and Temporal Variation of PM2.5 and Atmospheric PCDD/Fs in Northern Taiwan during Winter Monsoon and Local Pollution Episode. Aerosol and Air Quality Research 17, 3151-3165 (2017).
Ngo, T. H., Wang, S. H., Ou Yang, C. H., Lin, T. Y., Li, C. T., Lee, C. T., Lin, N. H. and Chi, K. H.*, Long-term monitoring of atmospheric PCDD/Fs at Mount Lulin during spring season: PCDD/F source apportionment through a simultaneous measurement in Southeast Asia. Chemosphere 185, 368-375 (2017).
Ngo, T. H., To, T. H., Ngo, T. T., Nguyen, H. M. and Chi, K. H.*, Atmospheric PCDD/F Concentration and Source Apportionment in Rural, Agent Orange Hotspots, and Industrial Areas in Vietnam. Chemosphere 182, 647-655 (2017).
Chi, K. H.*, Ngo, T. H., Lin, T. Y., Ou Yang, C. H., Wang, S. H., Lee, C. T. and Lin, N. H., Evaluation of Atmospheric PCDD/Fs at Two High-Altitude Stations in Vietnam and Taiwan during Southeast Asia Biomass Burning. Aerosol and Air Quality Research, 16, 2706-2715. (2016)
Pan, S.Y., Liou, Y.T., Chang, M.B., Chou, Charles C.-K, Ngo, T.H. & Chi, K.H.* Characteristics of PCDD/Fs in PM2.5 from emission stacks and the nearby ambient air in Taiwan. Sci Rep 11, 8093 (2021).
Source apportionment of PCDD/Fs in the atmosphere PCDD/Fs are highly concerned pollution because of their toxicity and persistence in the environment. Because of its stability, PCDD/Fs can be originated from the local sources or be transported through long-range transport to the monitored areas. Different tools should be used to study their origin, including profile analysis or transportation simulation model. In my research, I have found that the significant sources of PCDD/Fs in Taiwan were industrial and traffic activities, which were reduced every year. However, during some special monsoon events, the atmosphere of Taiwan could be highly impacted by air pollution from other countries.
Health impacts of PM2.5 Many research found an association between PM2.5 and human health. However, most of these researches were conducted considering PM2.5 as one type of pollutant. PM2.5 can work as a carrier that consisted of many different types of hazardous chemicals, including metals, ions, and organic compounds. It is expensive and time-intensive to analyze all the components of PM2.5. Therefore, we apply new methods using monitoring data for source apportionments. The source of PM2.5 can serve as a proxy for the features of PM2.5. We have found that with the same increment amount of PM2.5, stationary sources PM2.5 are associated with higher mortality risks than mobile sources of PM2.5.