If background noise still goes on, you can always use noise-canceling software or plugins. It will also help to position a sound filter between your mouth and your mic.
Since the Blue Snowball Mic features two polar patterns, Cardioid and Omni, you can choose between these two polar patterns to get the best setup for any application. Setting the Blue Snowball Mic right will enable you to minimize background noises. Conclusion Techniques for Reducing Blue Snowball Mics Background Noise