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Chinese tourists wearing face masks against air pollution visit the Tiananmen Square in heavy smog in Beijing, China, 26 November 2018. The air qual Stock Photo - Alamy
Masks, Purifiers and Condoms: Online Sales Spike as China's Smog Thickens - WSJ
China Holds Five Officials Over 'Falsification' of Air Monitoring Data — Radio Free Asia
Air filter producers can no longer mask poor quality - Business - Chinadaily.com.cn
China Smog Triggers Demand for Masks, Filters, but Hobbles Deliveries
Autism's connection with air pollution explored in research
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Chinese urbanites are spending millions on anti-pollution masks—and most of them don't do anything — Quartz
Masks to protect against China's smog not always effective, tests show | CBC News
How did China's air pollution get this bad?
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A woman wearing a face mask to combat the awful air pollution in Suihua city in Northern China Stock Photo - Alamy