Here in Australia (and perhaps elsewhere), the high altitude balloons used to measure upper atmosphere currents (aka radiosondes) use Hydrogen[0] for the balloo

Here in Australia (and perhaps elsewhere), the high altitude balloons used to measure upper atmosphere currents (aka radiosondes) use Hydrogen[0] for the balloons. They launch them often enough that they can justify the hydrogen generation and handling equipment, which has, as you may expect, more stringent requirements. [0] http://www.antarctica.gov.au/living-and-working/stations/davis/this-week-at-davis/2017/this-week-at-davis-28-april-2017/the-davis-hydrogen-generator http://www.antarctica.gov.au/living-and-working/stations/dav...