an unpleasant or unhealthy atmosphere
miasma - cloud
The word ‘miasma’ can be used in both a literal and figurative way. Literally, it refers to a cloud or fog of dirty, foul-smelling vapour that hangs in the air and is typically unhealthy to inhale. In a figurative sense, it expresses a malevolent influence, feeling, or atmosphere that seems to surround a person or place. In both senses, the term is always used in a negative context.
A miasma of uncertainty hung in the air of the office as we waited on tenterhooks to hear whether the merger had been completed or not.
The air pollution in this part of the country is dreadful. Every morning when I drive to work I can see a miasmic haze hanging over the city.
It was hard to find Alex in the packed bar as I had to search for him through a dense miasma of cigarette smoke.