[petrochemist]

There are specialist narrowband filters to remove sodium light (as used in many street lights) sold for astronomy, but they would be hideously expensive in a size suitable for mounting on standard camera lenses & will probably give you other false colours for more normal photography. I doubt any other filter would be much good.

As the previous posters have mentioned the cameras white balance is the obvious way to go - If your camera has a custom white balance that would be the best option (these require you to take a photo of just something white - like the centre of a piece of plan paper - and allow the camera to correct for the local light). These days high pressure sodium lamps (& mercury lamps etc...) are becoming more common for street lighting which give a different bluer light to the very yellow older low pressure sodium lights. The local mix of these will have an effect on any of the predefined white balance settings on the camera.

Some software (such as ACDsee that I use most, & probably Photoshop etc...) have a colour cast feature which allow you to correct an overall colour shift such as this after the event. It requires you to select a point in the the image that should be a neutral grey or white. Results are usually fairly good - but getting the right white balance first is the better way to go if you can. This at least means you previous photos are not wasted, and gives you a chance of recovery when you forget to change back, or don't have time to change it...

Mike