Smiting Sickness
From Super-wiki
Smiting sickness is caused when angels release an immense force of power on Earth, causing fallout to poison the surrounding area for a few miles. If a human ventures into an area that has fallout, they will become disoriented and begin vomiting the closer they get to ground zero. The symptoms are so sever they cannot be healed by an angel, with the effects of the sickness become worse the closer a human gets, Lot's wife having turned to salt due to her proximity to a smiting event. Smiting of this magnitude rarly happens on Earth, with the destruction of Sodom and Gomorrah and the attack on Amara being the only two known cases.