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Effectiveness of face masks used to protect Beijing residents against particulate air pollution

 

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Apr 2018822834134
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Jun 201866266772
Jul 201838638652
Aug 201812071208100
Sep 2018673673112
Oct 201814731473171
Nov 201827032703173
Dec 201813571357170
Jan 2019297029541455
Feb 201919671935363
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Apr 201921552091170
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Aug 202029402727213
Sep 202026472407233
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Dec 202017171554126
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Aug 202173064486
Sep 2021619541156
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Feb 202280072672
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Apr 202257551182
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Jun 202255845851
Jul 202242237649
Aug 202242038255
Sep 202246941165
Oct 202246641847
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Dec 202240436839
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Mar 202339934265
Apr 202327222732
May 202323419744
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Jul 202330325965
Aug 202338632566
Sep 202343738337
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Nov 202346242349
Dec 202344540240
Jan 202419818568
Feb 202458149795
Mar 2024476413148
Apr 202444337350
Total10889710331614754