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

 

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Apr 2018822834134
May 201839623979336
Jun 201866266772
Jul 201838638652
Aug 201812071208100
Sep 2018673673112
Oct 201814731473171
Nov 201827032703173
Dec 201813571357170
Jan 2019297029541455
Feb 201919671935363
Mar 201920572001719
Apr 201921552091170
May 201919731934162
Jun 201912461225106
Jul 2019869849105
Aug 20191322128492
Sep 201914791437158
Oct 201914851422160
Nov 201916381577260
Dec 2019168716311342
Jan 202042984215822
Feb 202033153199418
Mar 202088748645775
Apr 202010470101471063
May 202031773020609
Jun 202029482776330
Jul 202040173721352
Aug 202029402727213
Sep 202026472407233
Oct 202029642770185
Nov 202017401478144
Dec 202017171554126
Jan 202127432616109
Feb 202117661652102
Mar 202115121382195
Apr 202114521310175
May 20211018923112
Jun 202168862682
Jul 202167963294
Aug 202173064486
Total937889006412637