Overview
- Local authorities in Yuncheng, Shanxi, installed rooftop misting systems this week that release dense sheets of fine spray down between high‑rise blocks to cool streets and walkways.
- The installations rely on evaporative cooling: high‑pressure nozzles create tiny droplets that absorb heat as they evaporate, the same physical process as sweating.
- State and local media and viral videos report rapid local drops in air and surface temperature of roughly 5°C to 8°C when outdoor heat reaches about 38°C.
- Officials and some outlets have highlighted the approach as low in electricity use because it mainly needs pumps and no compressors, and residents in footage appear to get quick relief from the heat.
- Scientists and commentators warn the method’s benefits depend on humidity and water availability, and they note there are no independent, peer‑reviewed field measurements yet to confirm the reported cooling or show long‑term water and health impacts.