和城市比，我觉得公园里的空气比较好。

Hé chéngshì bǐ, wǒ juéde gōngyuán lǐ de kōngqì bǐjiào hǎo.

Compared with the city, I think the air in the park is better.

在市郊可以呼吸到新鲜空气。

Zài shìjiāo kěyǐ hūxī dào xīnxiān kōngqì.

You can breathe fresh air in the suburbs.

空气污染的问题越来越严重。

Kōngqì wūrǎn de wèntí yuèláiyuè yánzhòng.

The air pollution problem is getting more and more serious.