Odor pollution is one of the most critical issues in food waste (FW) recycling and has significant implications for human health. However, knowledge of their occurrence and spatiotemporally dynamic in urban FW streams is limited, making it not conducive to implement targeted odor management. This work followed the occurrence of 81 odor compounds (OCs) in nine FW-air environments along the Shanghai's FW streams for one year. Results showed that NH₃, acetic acid, acetaldehyde, acetone, 2-butanone, and methylene chloride were consistently the predominant OCs, despite the distinct differences in OCs profiles across seasons and treatment sites. Ridge regression and principal coordinate analysis demonstrated that seasons might play a non-negligible role in shaping odor profiles, and ambient temperature and humidity could account for the seasonal variation in OCs levels. Based on the modified fuzzy synthetic evaluation system, the screened priority pollutants in different FW-air environments were found broadly similar and the regulated air pollutants released via FW should be expanded to aldehyde and ketone compounds, especially for acetaldehyde. To our knowledge, this study is the first to track the spatiotemporal footprints of OCs within urban FW streams, and provides new insights into the control policy on FW-derived odor issues for megacities.

气味污染是食物垃圾 (FW) 回收中最关键的问题之一，对人类健康具有重大影响。然而，对它们在城市 FW 流中的发生和时空动态的了解有限，不利于实施有针对性的气味管理。这项工作跟踪了上海 FW 流沿线 9 个 FW 空气环境中 81 种气味化合物 (OCs) 的发生一年。结果表明，NH ₃，乙酸、乙醛、丙酮、2-丁酮和二氯甲烷一直是主要的 OCs，尽管不同季节和处理地点的 OCs 分布存在明显差异。岭回归和主坐标分析表明，季节可能在塑造气味剖面方面发挥不可忽略的作用，环境温度和湿度可以解释 OCs 水平的季节性变化。基于改进的模糊综合评价系统，发现不同FW-空气环境中筛选出的优先污染物大致相似，通过FW释放的受管制空气污染物应扩大到醛和酮类化合物，尤其是乙醛。据我们所知，这项研究是第一个跟踪城市 FW 流中 OC 的时空足迹的研究，