I was going to comment on your last show where you said you didn't think any processing was necessary.

While I agree content is king, you might find this tip handy.  When I record in noisy environments, I record a few seconds without speaking to pick up the background noise.

The reason for this is so that you can use those seconds as a model for noise reduction in audacity.  Only takes a few seconds to process in audacity so it's not much more work. 

Since this is a common practice, did you try this?