In this work, we report metals concentrations in 80 PM₁₀ samples collected at four sites in the Mexico City Metropolitan Area (MCMA): Tlalnepantla (NE), Xalostoc (NE), Merced (C), and Pedregal (S), during the dry/cold season (October to January) for the 2004–2014 period. Mean PM₁₀ mass concentration (66.1 µg m⁻³) significantly exceeds the annual mean air quality guidelines recommended by the World Health Organization. The statistical analysis of concentration data and meteorological parameters allows us to recognize the importance of wind intensity speed (Wsp) and wind direction conditions in the enrichment of PM concentrations. The proximity and magnitude of the emitting source is also relevant for PM concentration. Such conditions favored that higher metal concentration was recognized at the north of the studied area. By means principal component analysis (PCA) was difficult to identify the groups of metals associated with specific sources (anthropogenic and geogenic) given the high complexity of the study area and the long period of time evaluated. Metal concentration trend shows an important positive trend for Pt, V and Cr, while PM₁₀, Ni, Cu, Ag and Sb show a trend of moderate increase. In contrast, Pb and Co registered a strong percentage reduction, while Hg, Mn, As and Cd show a slight reduction, probably resulting from the implementation of regulatory measures and influenced by urban changes associated at the north of the studied area. The results of this research provide information that should be considered for evaluating the impact of anthropogenic sources and applying regulatory measures to control emissions.

在这项工作中，我们报告了在墨西哥城大都市区（MCMA）的四个地点采集的80个PM ₁₀样品中的金属浓度：Tlalnepantla（NE），Xalostoc（NE），Merced（C）和Pedregal（S）。 2004-2014年期间的干/冷季节（10月至1月）。PM ₁₀平均质量浓度（66.1 µg m ^-3）大大超过了世界卫生组织建议的年度平均空气质量指南。浓度数据和气象参数的统计分析使我们能够认识到风速（Wsp）和风向条件对PM浓度富集的重要性。发射源的接近度和大小也与PM浓度有关。这样的条件有利于在研究区域的北部发现更高的金属浓度。考虑到研究区域的高度复杂性和较长的评估时间，通过主成分分析（PCA）很难确定与特定来源（人为和地质成因）相关的金属类别。金属浓度趋势显示Pt，V和Cr呈重要的正趋势，而PM_{如图10所示}，Ni，Cu，Ag和Sb显示出适度增加的趋势。相比之下，铅和钴的百分比降低幅度很大，而汞，锰，砷和镉的百分比降低幅度很小，这可能是由于实施监管措施所致，并且受研究区域北部相关城市变化的影响。这项研究的结果提供了评估人为来源的影响并应用监管措施控制排放时应考虑的信息。