Answer:
It really depends on what type of mask you wear. I recommend trying a candle test to see if you're wearing a good mask or not. (Wear your mask, hold a candle close to your face, and blow. If the candle flickers, it's not a good mask.) If you don't have a good mask, then you should definitely wear two, but if it works ok, it will only make a little difference.
Explanation:
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