1. 难闻的气体;瘴气
You can describe something bad or confused that seems to be in the air all around you as a miasma .

1. unhealthy vapors rising from the ground or other sources

e.g. the miasma of the marshes
a miasma of cigar smoke

Synonym: miasm

2. an unwholesome atmosphere

e.g. the novel spun a miasma of death and decay

Synonym: miasm