I have never heard of a suicide wind before, but it sounds like a great premise to a horror story. From a 1904 newspaper article:
Suicide Wind
In Brazil and other parts of South America the natives know and fear a certain condition of the air, which they call “suicide wind.” It is not a superstition, but an actual condition of the atmosphere which seems to drive people to madness, and during its continuance self-induced deaths are numerous. Criminologists and scientists all over the world are interested in this peculiar atmospheric influence, which is indicated by a soft, moist, warm air that settles heavily on the earth.
Source (1904, March 11). Suicide wind. The Rice Belt Journal, p. 2.
