"Recent studies suggests that increased atmospheric methane emissions produce additional water vapor once the methane molecules reach the mesosphere - creating, or reinforcing existing noctilucent clouds.[1]"
It does seem like an interesting idea. The big problem I have is one of privacy as I would be uncomfortable with submitting my location data (even if anonymized) to an offsite entity.
I would hope that you have an easily accessible "kill" switch to turn off tracking.
Coincidently, I was just considering what would be involved in creating such an app for myself. My curiosity was piqued when I cam across the Super Day app.
"Recent studies suggests that increased atmospheric methane emissions produce additional water vapor once the methane molecules reach the mesosphere - creating, or reinforcing existing noctilucent clouds.[1]"