本研究分析環保署手動採樣2013年至2016年之樣品，以探討歷年各空品區PM2.5及其化學組成的差異，以及高濃度與低濃度事件日期間，細懸浮微粒濃度及其水溶性離子成份濃度與前驅氣體濃度及氣象因子之關聯性。
四年全臺監測站皆以SO42- (19~38 %)占比例最高，其次為NH4+ (9~18%)與NO3- (4~20 %)；天氣型態以東北季風型、高壓出海型、高壓迴流型、鋒前暖區型、臺灣近海鋒面型於4年中有最多案例，鋒前暖區型在北部(30~33 %)、竹苗(21~46 %)、中部(29~57 %)空品區事件日占比最高，高壓出海型在雲嘉南(60~78 %)、高屏(44~56 %)空品區占比最高。4年PM2.5組成成分比較結果，全臺多數測站Na+、NH4+、Mg2+、Ca2+、Cl-、nss-SO42-皆有顯著差異；K+全臺測站在4年間皆有顯著差異；NO2-、NO3-則在多數測站無顯著差異。
現址生成衍生性氣膠估算結果，北部空品區I > 2，J > 1占所有案例40 %為最多，中部空品區I < 2占48 %，雲嘉南空品區I > 2，J > 1占所有案例61 %，高屏空品區以I < 2占50 %。
境外傳輸貢獻方面，全臺PM2.5平均濃度北風案例(27±11 μg/m3)較南風案例(13±5 μg/m3)高。北風案例中，全臺境外傳輸PM2.5平均貢獻比例為46~58 %；NH4+為44~57 %； NO3-為23~35 %； nss-SO42-為48~62 %。南風案例中，全臺PM2.5平均貢獻比例為44~57 %；NH4+為32~65 %； NO3-為52~83 %；nss-SO42-為28~64 %。

Fine particle (aerodynamic diameter <2.5 mm), have been found to be associated with ambient air quality problems in urban areas including health problems. Particle samples were collected at ambient air quality monitoring stations, using a PQ 200 PM2.5 sampler from 2013. Ion chromatography was used to analyze the concentrations for water-soluble ionic species. During 2013~2016, the results show that the major species are sulfate, ammonium, and nitrate. The fractions of sulfate are the greatest among all analyzed species and are 19~38%; those of ammonium and nitrate are 9～18% and 4～20%, respectively. The synoptic weather types A2 showed the high probability of occurring high concentrations of PM2.5 in North (30~33%) and Chu-Miao (21~46%) and Central (29~57%). The synoptic weather types A11 showed the high probability of occurring high concentrations of PM2.5 in Yun-Chia-Nan (60~78%) and Kao-Ping (44~56%). Compared with the results of the composition of PM2.5 for 4 years, Na+, NH4+, Mg2+, Ca2+, Cl-, nss-SO42- were significantly different in most stations. K+ were significantly different in all stations.NO2- and NO3- is not significantly different at most stations.

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