In the last two decades, mixed-use has taken center stage in urban planning development in the United States. This study examined the relationship between mixed-use development and carbon dioxide (CO₂) emissions in the zip code level in the U.S.

This research uses different implementation methods of a mixed-use development with different cultural and historical backgrounds to examine the data. The study adopts five models that present different methodological interactions between socioeconomic spatial metrics and urban forms.

The results indicated that there were correlations between spatial indices of urban form and CO₂ emissions. The inverse relationship between the mixed-use density and CO₂ emissions in our study suggests that low, dense metropolis with more businesses emit less CO₂ than the hybrid metropolis, so it provides a healthier environment. A likely explanation is that low density and more recreation facilities attract people to live in these areas, which present the importance of density cities as a source of CO₂. Also, there is a need for monitoring and reporting of emissions. This study contributes to the study of how mixed-use development models shift because of various environmental, social, and economic conditions.

在过去的二十年中，混合用途已成为美国城市规划发展的中心阶段。这项研究以美国的邮政编码级别检查了混合用途开发与二氧化碳（CO ₂）排放之间的关系。

这项研究使用具有不同文化和历史背景的混合开发的不同实现方法来检查数据。该研究采用了五个模型，这些模型展示了社会经济空间指标与城市形态之间不同的方法论相互作用。

结果表明，城市形态空间指标与CO ₂排放量之间存在相关性。在我们的研究中，混合用途密度与CO ₂排放量之间存在反比关系，这表明低密度的大都市商业活动所产生的CO ₂比混合大都市少，因此它提供了更健康的环境。一个可能的解释是，低密度和更多的娱乐设施吸引人们居住在这些地区，这表明了密度城市作为CO ₂来源的重要性。另外，需要监测和报告排放。这项研究有助于研究由于多种环境，社会和经济条件而导致的混合开发模式的转变。