下列污染现象主要与<img class="kfformula" src="20200629/1593429156221829.png" data-latex="{NO}_{2}" width="40" height="25"/>有关的是（）。

【单选题】【消耗次数：1】

① 光化学烟雾

② 水体富营养化

③ 温室效应

④ 臭氧空洞

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