Atmospheric PM2.5 near an Urban-Industrial Complex during Air-pollution Episodes with Various Meteorological Conditions

• DOI: 10.4209/aaqr.220187
• Publication Date: 2022-07-07T08:07:57Z
• Authors: Sheng-Lun Lin; Yunzhou Deng; Chien-Er Huang; Kun-Kuo Tien; Yen-Yi Lee
• Keywords: Mass concentration (chemistry)

This study investigates the atmospheric fine particulate matter (PM2.5) issue caused by multi-effect of complicated sources, terrain, and meteorology at Southern Taiwan. Three sampling stations represent an urban, a rural, coastal sites near urban-industrial complex. The PM2.5 were measured during pollution episode from November to February, when reference samples collected in April. sample was with constant-flow sampler Federal Reference Method performance. After determining mass, their chemical compositions ions, metals, carbons analyzed for different properties multi-factors. mass balance (CMB) model employed evaluate emission contributions. Additionally, inverse trajectory is used analyze pollutant transport support CMB results. air-pollution episodes occurred within winter spring. composed 51-69% 18-31% carbonaceous species, 1.5-3.0% metals. SO42-, NH4+ NO3- contributed 92-96% ions. Most organic/elemental carbon ratios low, suggesting more primary emissions. metal contents minor dominated Fe Zn. indicated 24% secondary 14.7% traffics, 8.3% petrochemical emissions, 6.8% soil dust, 4.5% sintering plant emission. For non-episode days, 34.9% 30% 10.3% , dust. Nevertheless, frequent sea-land breeze might lead powerful wind eddies bring aerosol precursors areas. Consequently, uncontrollable meteorological changings would issues lowly convective area. Therefore, averaging emissions should be lowered; meanwhile, rapid controls are suggested high-level forecasted.