Is there a predator of pigeons that won't scare away the little birds?
A Wind-chime can be hung and scare pidgeons away. Or even an aluminum foil plate if you do not want to buy a wind-chime . Other suggestions, hang several balloons, put out a decoy, owl or hawk. A possibly scatter rubber snakes.
I always just hang up a lot of old CD's around the yard. When they turn and the sun catches them, birds don't like this and stay away. They don't like any reflective surface at all.
This is a page about keeping pigeons off your balcony. Pigeons can be very messy visitors to your porch or balcony.
Pigeons can sometimes choose a nesting spot that is inconvenient or worrisome for a home owner or apartment dweller. If she has already laid eggs you can read on to see some ideas on what to do about a nesting pigeon and discouraging future nests.
This page is about dealing with pigeons and their droppings. These birds spending time in your outdoor living area can leave a mess.