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What's the difference between Level One and Level Two:- Level 2 is better:-

3Ply Flat Face Mask, CE tested

CE marking is a certification mark that indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA). ... The CE marking is the manufacturer's declaration that the product meets EU standards for health, safety, and environmental protection.

Face masks may reduce COVID-19 spread by 85%, WHO-backed study suggests issed 1 June 2020:- https://www.livescience.com/face-masks-eye-protection-covid-19-prevention.html