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Protesters in face masks march against Belgrade's smog | AP News
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Masks to protect against China's smog not always effective, tests show | CBC News
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5 million masks distributed as 'toxic' smog descends on Delhi during Diwali - ABC 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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Pollution Chic: China's Smog Prompts Face Masks on Fashion Week Runways - ABC News
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Anti-pollution masks around world[2]- Chinadaily.com.cn
