What is miasmic?

The term "miasmic" refers to the concept of miasma, which historically described a noxious form of "bad air" thought to cause disease. In this context, it was believed that foul-smelling air from decaying organic matter could lead to illnesses. Although this theory has been debunked with the advent of germ theory, "miasmic" can still describe environments or situations perceived as unhealthy or toxic. Today, it might be used metaphorically to convey a sense of moral or social corruption as well.