If I were tasked with improving Bhutan, one of the things I would focus on is probably lead. 3/4 of Bhutanese children have elevated levels of lead in their blood.
https://www.unicef.org/bhutan/press-releases/national-blood-...
replies(1):
https://www.unicef.org/bhutan/press-releases/national-blood-...
[1, 2] = https://www.researchgate.net/publication/365897933_Potential...
[3] = https://www.bbs.bt/national-blood-lead-level-survey-reveals-...