pollution前面加什么冠词

前面加冠词the，例如：

1、Their mood is generally glum-and not just because of the pollution that has blighted China's capital over recent months， after what had been a glorious spring.他们大都心情郁闷，不仅仅是因为近几个月一直困扰中国首都的污染问题——在过了一个明媚的春天之后。

2、Yet the pollution problem suggests the leadership needs urgently to adopt a "greener" measure of "performance."然而污染问题表明，领导层需要迫切采取“更绿色”的“绩效”措施。