Wow that's scary, I used so much of that stuff . It's weird but if you read through the wiki on that it sounds like it may not have been dmso
Death of Gloria Ramirez - Wikipedia
In normal circumstances DMSO does not convert to these proposed toxic chemicals they describe in the Wiki. It says that electric shocks and oxygen therapy are BOTH required to get DMSO to convert into the toxic chemical. And even then it is just a conjecture. Dimethyl sulfate was never found on her, the ER room where she was treated, or on any of the affected hospital staff. SUbsequet experiments failed to replicate the synthesis of dimethyl sulfate even in laboratory conditions with all precursors and catalysts present.
"...However, the dimethyl sulfoxide theory has come under scrutiny in the scientific community for several reasons, the primary reason being that the proposed dimethyl sulfate generation could not be replicated in laboratory trials. Also, the symptoms displayed by the nursing staff members who fell ill while caring for Ramirez are not consistent with dimethyl sulfate exposure. Another reason the dimethyl sulfate theory is unlikely is that the odor observed by the staff was described as "ammoniacal", but dimethyl sulfate is described as having a faint odor reminiscent of that of onions."
The most likely explanation is actually quite prosaic and something we have discussed here before. People with advanced cancer have elevated levels of ammonia in the body builds, breath and organs. See above quote for hospital staff describing the smell as ammonia. These patients also exude a number of toxic chemicals like cadaverine and putrescine.
Universal Test For Cancer Progression/Stage
Ammonia, cadaverine and putrescine can easily make a person sick on their own and I know of several medical staff who got nauseous and dizzy while caring for terminally ill patients. In some cases, the organs of advanced cancer patients start decomposing while they are still alive and that can also cause a person around them to feel quite sick.
DMSO may have reacted with some of those chemicals or at least contributed to their increase absorption/bioavailability in a bystander who is inhaling contaminated air or touching body fluids containing a combination of DMSO and these toxic chemicals. But to blame DMSO as an actual cause for this incident is beyond irresponsible.