What is already known about this topic? Face masks or respirators (N95/KN95s) effectively filter virus-sized particles in laboratory settings. The real-world effectiveness of face coverings to prevent ...
The Centers for Disease Control and Prevention (CDC), whose previous advice about face coverings as a safeguard against COVID-19 paid little attention to large differences in the effectiveness of ...
Stepping out during pollution season in many Indian cities feels like walking through a soft cloud that you cannot escape. The air smells burnt, your eyes sting a little, and you can almost feel the ...
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