In this study, 123 PM_2.5 filter samples were collected in Wuhan, Hubei province from December 2014 to November 2015. Water- soluble inorganic ions (WSIIs), elemental carbon (EC), organic carbon (OC) and inorganic elements were measured. Source apportionment and back trajectory was investigated by the positive matrix factorization (PMF) model and the hybrid single particle lagrangian integrated trajectory (HYSPLIT) model, respectively. The annual PM_2.5 concentration was 80.5 ± 38.2 μg/m³, with higher PM_2.5 in winter and lower in summer. WSIIs, OC, EC, as well as elements contributed 46.8%, 14.8%, 6.7% and 8% to PM_2.5 mass concentration, respectively. SO₄²⁻, NO₃⁻ and NH₄⁺ were the dominant components, accounting for 40.2% of PM_2.5 concentrations. S, K, Cl, Ba, Fe, Ca and I were the main inorganic elements, and accounted for 65.2% of the elemental composition. The ratio of NO₃⁻/SO₄²⁻ was 0.86 ± 0.72, indicating that stationary sources play dominant role on PM_2.5 concentration. The ratio of OC/EC was 2.9 ± 1.4, suggesting the existence of secondary organic carbon (SOC). Five sources were identified using PMF model, which included secondary inorganic aerosols (SIA), coal combustion, industry, vehicle emission, fugitive dust. SIA, coal combustion, as well as industry were the dominant contributors to PM_2.5 pollution, accounting for 34.7%, 20.5%, 19.6%, respectively.

本研究于 2014 年 12 月至 2015 年 11 月在湖北省武汉市采集了 123 个PM _{2.5过滤器样品。测量了水溶性无机离子 (WSII)、元素碳 (EC)、有机碳 (OC) 和无机元素。}分别通过正矩阵分解（PMF）模型和混合单粒子拉格朗日积分轨迹（HYSPLIT）模型研究了源分配和反向轨迹。全年PM _2.5浓度为80.5±38.2 μg/m ³，PM _2.5冬季较高，夏季较低。WSII、OC、EC 以及元素对 PM _2.5质量浓度的贡献分别为 46.8%、14.8%、6.7% 和 8%。SO ₄ ^2- , NO₃ ^-和NH ₄ ⁺是主要成分，占PM _2.5浓度的40.2%。S、K、Cl、Ba、Fe、Ca和I为主要无机元素，占元素组成的65.2%。NO ₃ ^- /SO ₄ ^2-比值为0.86±0.72，表明固定源对PM _2.5浓度起主导作用。OC/EC 的比值为 2.9 ± 1.4，表明存在次生有机碳 (SOC)。使用PMF模型确定了五个来源，包括二次无机气溶胶（SIA）、燃煤、工业、车辆排放、扬尘。SIA、燃煤以及工业是 PM 的主要贡献者_2.5污染，分别占34.7%、20.5%、19.6%。