noxious
/ˈnɒkʃəs/adjective
Poisonous or damaging, especially to health.
Example sentences
- “Open a window when using the paint to avoid breathing noxious vapours.”
- “A noxious cloud of smoke rose from the burning tires.”
Standard with 'fumes' and 'gases'. Stronger than 'unpleasant': noxious things do actual harm.