There's some interesting research going on using hydrogen instead of helium for radiosonde launches. The arctic ARM site has been using it for a few years: htt

There's some interesting research going on using hydrogen instead of helium for radiosonde launches. The arctic ARM site has been using it for a few years: https://phys.org/news/2023-05-helium-hydrogen-weather-balloons.html https://phys.org/news/2023-05-helium-hydrogen-weather-balloo... Overheard that the hydrogen dangers aren't as bad when something less compressive is used for the balloon, so a non-flex fabric instead of latex.