The presence of organochlorine pesticides (OCPs) and polybrominated diphenyl ethers (PBDEs) was analysed in air particulate matter ≤ 2.5 μm (PM_2.5) and ≤ 10 μm (PM₁₀) collected in the Metropolitan Zone of Mexico Valley (MZMV), during 2013 and 2014, respectively. Spatial and seasonal distributions of PM and their organic content named solvent extracted organic matter (SEOM) were determined. PM mass concentration and SEOM/PM ratios were compared with previous studies in 2006 in Mexico City. PM_2.5 concentration was like found in 2006, however, PM₁₀ decreased ∼43%. The SEOM/PM₁₀ ratio was kept constant, suggesting a decrease in SEOM as well as PM₁₀ emitted from natural sources, probably as a result of changes in the land use due to urban growth. A decrease ∼50% SEOM/PM_2.5 ratio was observed in the same period, linked to adequate strategies and public policies applied by the local and federal governments to control the organic matter emitted from anthropogenic sources.

在2013年期间，分析了在墨西哥谷大都市区（MZMV）收集到的空气颗粒物≤2.5μm （PM _2.5）和≤10μm（PM ₁₀）的有机氯农药（OCPs）和多溴二苯醚（PBDEs）的存在和2014年。确定了PM的时空分布及其有机成分，称为溶剂萃取有机物（SEOM）。将PM质量浓度和SEOM / PM比值与2006年墨西哥城的先前研究进行了比较。PM _2.5的浓度与2006年相似，但是PM ₁₀降低了约43％。SEOM / PM ₁₀比率保持恒定，表明SEOM降低以及自然来源的PM ₁₀排放，可能是由于城市增长导致土地用途变化的结果。同期观察到SEOM / PM _2.5比率降低了约50％，这与地方和联邦政府为控制人为源排放的有机物而采取的适当策略和公共政策有关。