During the interim period, air quality has deteriorated.

【interim】在过渡期间，空气质量下降了。

Second, the Chinese Football Association (CFA) could use this interim period to search for a high-caliber coach willing to take on the challenging task of rebuilding China's soccer fortunes.

其次，中国足协可以利用这段过渡期寻找一位愿意承担重建中国足球命运这一艰巨任务的高素质教练。