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Pollutionwatch: do face masks really prevent the ill effects of pollution? | Air pollution | The Guardian
![A Chinese man wears a face mask while walking on a sidewalk in heavy pollution in Beijing on January 9, 2018. China's air pollution is causing its residents to die three years A Chinese man wears a face mask while walking on a sidewalk in heavy pollution in Beijing on January 9, 2018. China's air pollution is causing its residents to die three years](https://c8.alamy.com/comp/W01DWY/a-chinese-man-wears-a-face-mask-while-walking-on-a-sidewalk-in-heavy-pollution-in-beijing-on-january-9-2018-chinas-air-pollution-is-causing-its-residents-to-die-three-years-early-according-to-a-new-study-by-the-academy-of-sciences-photo-by-stephen-shaverupi-W01DWY.jpg)
A Chinese man wears a face mask while walking on a sidewalk in heavy pollution in Beijing on January 9, 2018. China's air pollution is causing its residents to die three years
![China riot police seal off city centre after smog protesters put masks on statues | China | The Guardian China riot police seal off city centre after smog protesters put masks on statues | China | The Guardian](https://i.guim.co.uk/img/media/6ebb78cd9b54bd476972167d3674a7f9998235b7/445_339_7767_4661/master/7767.jpg?width=465&quality=85&dpr=1&s=none)
China riot police seal off city centre after smog protesters put masks on statues | China | The Guardian
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