Chemical characteristics and the sources of submicron particles (<1 μm in diameter) were investigated in Valle Alegre, the coastal area of Central Chile. The chemical composition of particles was studied by using a Soot particle Aerosol Mass Spectrometer and Multi-Angle Absorption Photometer. Submicron particles were dominated by organics (42% of mass) and sulfate (39% of mass) while the mass fractions of ammonium, nitrate and black carbon were much smaller (13, 2 and 4% of mass, respectively). Additionally, several metals (V, Zn, Fe, Cd, Cu, K, Na and Mg) were detected in submicron particles and also some of their inorganic salts (e.g. NaCl⁺, MgCl₂⁺, CaCl₂⁺, KCl⁺ and KNO₃⁺). The sources of particles were examined by using Positive Matrix Factorization (PMF). Organic aerosol (OA) was divided into five factors by using PMF; hydrocarbon-like OA (HOA), biomass burning OA (BBOA), low-volatility oxygenated OA (LV-OOA), semi-volatile OA (SV-OOA) and marine oxygenated OOA (MOOA). Oxygenated factors (LV-OOA; SV-OOA and MOOA) comprised 75% of total OA with LV-OOA being the dominant factor (38% of OA). Sulfate had two major sources in Valle Alegre; ∼70% of sulfate was related to anthropogenic sources through the oxidation of gas phase SO₂ whereas ∼24% of sulfate was associated with biogenic origin related to the oxidation of dimethyl sulfide in the marine environment. Regarding total submicron particle mass (campaign-average 9.5 μg m⁻³), the contribution of anthropogenic sources was at least as large as that of biogenic origin.

在智利中部沿海地区瓦莱阿莱格里（Valle Alegre），研究了化学特性和亚微米颗粒（直径<1μm）的来源。使用烟灰颗粒气溶胶质谱仪和多角度吸收光度计研究了颗粒的化学组成。亚微米颗粒主要由有机物（占质量的42％）和硫酸盐（占质量的39％）控制，而铵，硝酸盐和黑碳的质量分数则小得多（分别为质量的13％，2％和4％）。此外，在亚微米颗粒中还检测到几种金属（V，Zn，Fe，Cd，Cu，K，Na和Mg）以及一些无机盐（例如，NaCl ⁺，MgCl ₂ ⁺，CaCl ₂ ⁺，KCl ⁺和KNO）₃ ⁺）。通过使用正矩阵分解（PMF）检查了粒子的来源。利用PMF将有机气溶胶（OA）分为五个因素。类烃OA（HOA），生物质燃烧OA（BBOA），低挥发性氧化OA（LV-OOA），半挥发性OA（SV-OOA）和海洋氧化OOA（MOOA）。氧化因子（LV-OOA； SV-OOA和MOOA）占总OA的75％，其中LV-OOA是主要因子（占OA的38％）。硫酸盐在瓦莱阿莱格里有两个主要来源。约70％的硫酸盐是通过气相SO ₂的氧化与人为来源有关的，而约24％的硫酸盐与海洋环境中与二甲基硫的氧化有关的生物来源有关。关于总亚微米颗粒质量（运动平均9.5μgm ^-3），人为来源的贡献至少与生物来源一样大。