请根据博士论文的格式用中文补充绿地与PM25暴露对超重肥胖的交互研究现况并标准参考文献来源：绿地与PM25暴露的交互作用研究现况：现有研究提示绿地可以减少噪音和空气污染等有害环境暴露但两者之间的交互尚不明确。 John S Ji等在12873名65岁及以上中国老年人群中开展的研究发现NDVI与PM25具有协同作用即NDVI会减弱PM25对全因死亡风险的影响49。一项在3 159名死于呼吸系统疾病的

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