That's a wild but solid idea. City sounds are already a raw data stream—traffic rumble, HVAC hum, people chatter. If you map frequency shifts to emission levels or power draw, you get a live heatmap of the city's pulse. The trick is calibrating the audio signatures against real pollution metrics, but once you do, you’ll have a sonic dashboard that’s as actionable as any visual one. It’s the kind of experiment that keeps the nights interesting.