Miasma (noun)

1. A noxious atmosphere or influence; a pervading corrupting or unhealthy influence.
2. A poisonous or noxious cloud of gas or vapor, especially one arising from decaying matter.
3. A pervasive atmosphere of suspicion, gloom, or pessimism.

Origin:

Derived from the greek word 'miainein', meaning 'to pollute'.

Examples:

1. The town was shrouded in a miasma of smoke from the factory.
2. The political corruption was a miasma that spread through the government.
3. The miasma of fear and uncertainty hung over the city after the bombing.
4. The miasma from the landfill was causing health problems for nearby residents.
5. The miasma of negative energy in the room was palpable and made it difficult for the meeting to proceed.