noxious
adj.adj. harmful to your health or dangerous to living things. You use this to describe things like bad smells, poisonous plants, or chemicals that can make you sick.
adj. harmful to health or life; poisonous or injurious. Often describes substances that cause physical or biological damage upon contact or inhalation.
The factory released noxious fumes into the air.
The gardener warned that the plant was noxious and could cause skin irritation if touched.
The rapid expansion of industrial zones led to the accumulation of noxious gases in the valley, significantly degrading the local air quality and affecting the health of nearby residents.
From Latin noxius (“hurtful, injurious”), from noxa (“hurt, injury”), from nocere (“to hurt, injure”); see nocent.