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@bikedoc
Absolutely - but I suspect that people on this forum shift a lot more air per minute than the average boris biker. I've seen figures that show a range of respiratory minute volume that up to 5x that of a car passenger. Also, exposure inside a car is probably similar regardless of city, but on a bike may well differ between London and Copenhagen (paper quoted is historical and I lack up to date figures), so the ratios quoted may not hold out in the square mile.
Still - i agree - it ain't necessarily so... study will give us some more information to go on. keep signing up and we'll hopefully start testing soon...