Do you have gas leakage detectors
Try the search feature:https://community.smartthings.com/search?q=gas%20detector
And you’ll find this:
That discussion also has the device handler you’ll need.
There aren’t any on the official “works with SmartThings” list of devices, if that’s what you mean. If you can find a z-wave or Zigbee gas detector, then it could be made to work with a community-developed device handler. I didn’t see any with a quick google search.