国际直接投资已跃升为国际经济交流的核心驱动力，并在经济发展中发挥着活跃且引人注目的作用。随着经济发展与环境保护之间的冲突加强，国际直接投资与东道国的环境关系也越发得到关注。据此，本文深入探讨了国际直接投资与东道国环境效应之间的内在联系。研究发现，外资存量对东道国的碳排放和污染物排放量存在显著的负向影响，外资存量与产业链定地位的交互项和污染物排放量之间也存在显著负相关。这些证明外资对东道国的环境影响存在污染光环效应，外资的进入有助于东道国的环境改善。同时也说明世界出口地位越高的国家，外资的清洁程度就越高。同时，本文还发现外资与东道国的GDP、人均GDP增长率呈显著正相关，与贸易强度、科技研发投入呈显著负相关。最后，本文根据前文的结论给出了相应政策建议，为东道国更好地实现经济和环境的双赢。

International direct investment has emerged as a pivotal driver in the realm of international economic interactions and played the most active and eye-catching role in economic development. As the conflict between economic development and environmental protection intensifies, the correlation between foreign direct investment and the environmental conditions of the recipient nation has garnered escalating attention. Accordingly, this article delves into a comprehensive examination of the interplay between international direct investment and the environmental consequences in the host country. The study found that there is a significant negative correlation between the stock of foreign capital and carbon emissions and pollutant emissions in the host country, as well as a significant negative correlation with the interaction between industrial chain positioning and pollutant emissions. These evidences suggest that foreign capital has a pollution halo effect on the environmental impact of the host country, and the entry of foreign capital helps improve the environment of the host country. At the same time, it also indicates that the higher the world export status of a country, the higher the cleanliness of foreign capital. In addition, this article also found that there is a significant positive correlation between foreign capital and the GDP and per capita GDP growth rate of the host country, and a significant negative correlation with trade intensity and scientific and technological research and development investment. Finally, based on the previous conclusions, this article provides corresponding policy recommendations to help the host country better achieve a win-win situation in economy and environment.