COVID on planes: What I learned by measuring CO2 levels on my flight - USA TODAY

Carbon dioxide levels can reflect COVID-19 risk, so I brought a detector aboard for my flights to Vermont and Denver. Here's what I found.

DENVER — On seat 10D, my eyes flicker between my fellow passengers crammed in the aisle and the carbon dioxide detector balanced on my knee. I can't help but shudder a little every time someone coug… [+6941 chars]

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