Great for raw, community-uploaded recordings.
You don't need a Hollywood budget to get high-quality television-style backgrounds. Check out these resources: Television Background-Sound Effect
Professional sound design is rarely just one track. To create a convincing "City" background, you might layer: Constant low-level traffic rumble. The Mid-Ground: Occasional car horns or sirens. Great for raw, community-uploaded recordings
If your characters are in a busy cafe but the background talk is indistinct, it creates a sense of isolation or focus on their private conversation. Great for raw
Always check your levels. Background sound should be felt, not heard. If a viewer stops to think, "Wow, that's a loud refrigerator hum," you've probably pushed it 3dB too far.
The Invisible Character: How to Use Television Background Sound Effects