Being based in NYC, we receive calls every day for our guidance on how to reduce sound. No window we use is completely sound proof, but there are a number of options to reduce noise significantly, even on the loudest streets and avenues in our city. One option is an interior application, or perhaps something as simple as adding a storm window. We can also configure multiple panes of glass, or varying thicknesses, to naturally and scientifically disrupt sound waves. Call us to discuss what would be the most appropriate solution for you. Various STC/OITC ratings are achievable.