With the completion of the Air Pollution Prevention and Control Action Plan (Action Plan) in the Guanzhong Basin (GZB), the wintertime fine particulate matters (PM_2.5) concentration has decreased by 50.0 μg m⁻³ (33.4%) from 2013 to 2017. Considering the significant impacts of meteorological conditions on particulate pollution, the effectiveness of anthropogenic emissions abatement on the PM_2.5 reduction in the GZB remain unclear. In this study, the WRF-Chem model was used to quantitatively evaluate the effectiveness of emissions mitigation on the particulate pollution in the GZB in December from 2013 to 2017. The model typically showed an affordable consistence with observations and simulation in meteorological parameters, atmospheric pollutants, and aerosol components. Sensitivity results revealed that emissions reduction decreases PM_2.5 concentrations by around 17% in the GZB, about half of the observed PM_2.5 decreased in December from 2013 to 2017, showing significant role of meteorological conditions in modulating particulate pollution. Emissions mitigation also decreased SO₂, CO and O₃ concentrations by around 55%, 17%, and 7%, respectively, but increased NO₂ concentrations by 27%. Additionally, the PM_2.5 decrease in the GZB is mainly contributed by the reduction of sulfate and primary organic aerosols, caused by implementation of stringent SO₂ mitigation measures and reduced coal use. However, the mitigation of elemental carbon, dust and nitrate aerosols are not significant, particularly with regarding to nitrate aerosols, which is influenced by increase of NO₂ and decrease of sulfate. Specified emissions mitigation strategies need to be designed to further lower the PM_2.5 level in the GZB.

随着关中流域（GZB）大气污染防治行动计划（行动计划）的完成，2013-2017年冬季细颗粒物（PM _2.5）浓度下降50.0 μg m ^-3（33.4%） . 考虑到气象条件对颗粒物污染的显着影响，人为减排对 PM _2.5的有效性GZB 的减少尚不清楚。在本研究中，WRF-Chem 模型用于定量评估 2013 年 12 月至 2017 年 12 月广州地区颗粒物污染减排的有效性。和气溶胶成分。敏感性结果显示，减排使广州地区PM _2.5浓度降低了约 17%，2013 年至 2017 年 12 月观测到的 PM _2.5浓度下降了约一半，表明气象条件在调节颗粒物污染方面发挥了重要作用。排放减缓也减少了 SO ₂、CO 和 O ₃浓度分别增加了约 55%、17% 和 7%，但 NO ₂浓度增加了 27%。此外，GZB的 PM _2.5减少主要是由于实施严格的 SO ₂减排措施和减少煤炭使用导致硫酸盐和一次有机气溶胶减少。然而，元素碳、灰尘和硝酸盐气溶胶的缓解作用并不显着，尤其是硝酸盐气溶胶，其受NO ₂增加和硫酸盐减少的影响。需要设计特定的减排策略，以进一步降低GZB的 PM _2.5水平。