# Talk:Roadway air dispersion modeling

The equation given in the theory section makes no sense. The $x^2$ in the top and bottom of the exponential cancel. I don't know what it should be, but I don't think its what this article says it is.[/itex]
That's better, but the dimensions aren't right. The argument of the exponent should be dimensionless. This one has dimensions (1/velocity^2). Should there be $d^2$ on the top? (that would make sense) -- GWO