In an incident of fall of a bottle containing fumigant, toxic gas is released in the hospital. Contact of fumigation chemical with water was believed to cause release of toxic gas.
Some fumigants upon inhalation can cause several health effects like nausea, headache, chest pain, drowsiness, etc.
Phosphine is one of the fumigation gas used for the purpose.
http://www.dnaindia.com/jaipur/report-gas-leak-at-mathuradas-mathur-hospital-in-jodhpur-kid-dead-icu-evacuated-2644137