In the advanced audio settings for Zoom you can adjust the level of filtering that you apply to steady and intermittent background noise. The default setting is "automatic." You can adjust that setting to be "aggressive" to filter more background noises.
You'll find the advanced audio settings in Zoom by clicking on the small drop-down menu that appears next to the microphone icon during your Zoom calls.
In this new video I provide a demonstration of how to reduce background noise in your Zoom meetings.