Hi Soldant,
The wavelengths of specific forms of light pollution are-
Mercury 365, 405, 546, 577,and 617 nanometres
High-pressure Sodium 570, 583, 600,and 617 nanometres
Natural Airglow 558 and weakly at 630 nanometres
For deep-sky use you would use a narrow bandpass filter such as an OIII, (496 to 501 nm), in a light polluted sky or even a UHC type, (485nm-Hydrogen Beta and OIII), from a dark sky.
Here's a few websites to look at for info on filters...
www.astronomik.com
www.lumicon.com
www.siriusoptics.com
Generally by using a filter will result in some loss of light and you can expect to pay anything from $150+ for a decent one!
Hope the info helps!