Ecosystem services (benefits to humans) of urban trees are thought to include positive health outcomes resulting from their reduction of air temperature, pollution, and noise, and their promotion of physical activity and wellbeing. Trees, however, are also associated with disservices such as pollen-related allergies and asthma, which has led to questioning of the benefits of urban greening on respiratory health. Surprisingly, the allergenic potency and cross-reactivity of most tree species are still largely unknown or based on undocumented methods. We argue that planning for healthy cities can be successful only with improved knowledge of the tree species that cause allergic responses and their distribution in urban spaces ().

中文翻译：

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我们到底对树花粉的致敏性了解多少？

人们认为，城市树木的生态系统服务（对人类的益处）包括因降低气温，污染和噪音以及促进身体活动和健康而带来的积极健康结果。然而，树木还与花粉相关的过敏和哮喘等疾病有关，这导致人们质疑城市绿化对呼吸健康的益处。令人惊讶的是，大多数树种的致敏力和交叉反应性仍是未知之数，或基于未记录的方法。我们认为，只有通过对引起过敏反应及其在城市空间中分布的树种的了解有所提高，规划健康的城市才能成功。