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![Anti-pollution masks around world[2]- Chinadaily.com.cn](https://www.chinadaily.com.cn/photo/images/attachement/jpg/site1/20131227/0023ae9885da142784ad06.jpg "Anti-pollution masks around world[2]- Chinadaily.com.cn")
Anti-pollution masks around world[2]- Chinadaily.com.cn
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Masks to protect against China's smog not always effective, tests show | CBC News
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Happy Smogiversary, LA. We Don't Wear Gas Masks Anymore But The Air Is Still Terrible | LAist
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Protesters in face masks march against Belgrade's smog | AP News
