Human exhaust.

Welcome to summer! It sure is hot.

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2 Responses to Human exhaust.

  1. Robert Arrington says:

    There are no zero-sum games in real life.

  2. I love this one.

    Though, I have to say, it depends on the vehicle to which you’re comparing the public transit. Where I live, smoking is prohibited in buses, but not in privately owned cars… so if you’re comparing a bus to the car of a smoker, I’d say the air quality inside the vehicle is the reverse of this graph.

    If you’re comparing it to a bike, I’m not sure how that would work. I haven’t tested the air quality inside my bike frame, though I do believe it’s hollow.