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If you cycle through areas with a lot of traffic, could the water end up contaminated with vehicle exhaust?

I'm pretty sure most harmful exhaust would be more harmful when breathed in, than when drunk?

Sorry to be pedantic, but if you are pretty sure, then how come you end your sentence with a question mark?

You don't sound sorry.

I didn't hear any sound at all.

In the same concentrations, I'm sure that's true, but the collection process will also concentrate pollutants quite a bit.