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@edmundro
I used to do it fairly regularly on a bmx to visit a mate who lived right by the tunnel mouth.
I found that on a freewheel if you got plently of speed up as you enter you can coast half of it fairly swiftly without really having to breath very much at all then get out the other side as quick as possible.
Walked it once and the air is terrible down there, if it only adds a few minutes to go either of the other two ways I'd go for that every time. I guess the air quality is dependent on how dense the traffic has been just as you go in but even at odd hours when theres no traffic its fucking grim.