What is the air quality in second-tier Chinese cities? Why do I often feel"?

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发表于 2024-8-20 21:13:35 | 显示全部楼层 |阅读模式

What is the air quality in domestic second-tier cities? Why do I have allergies? It's said that measurement standards differ from those abroad, isn't it?"
"I rarely get allergies abroad.

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