城市树木的益处可能被NO2排放抵消，研究发现

一项新的研究表明，汽车和建筑物排放的污染物与树木释放的挥发性有机化合物之间的化学反应，会抵消城市树木的环保效益。研究发现，氮氧化物（NO2）会阻碍植物的光合作用，从而降低二氧化碳吸收量。为了解决这个问题，城市可以采取措施减少氮氧化物排放，例如推广电动汽车和发展绿色建筑。

Original Title: NO2 Emissions in Can Undo Some Benefits of City Trees, Study Finds
Article Content:
A chemical reaction involving emissions from cars and buildings can negate their environmental benefits. New research shows what big cities can do about it.

Original article: https://www.nytimes.com/2024/08/20/climate/pollution-trees-clean-air.html