In general, levels of zinc in air are relatively low and fairly constant. Air near industrial areas may have higher levels of zinc. Many zinc salts are highly soluble in water. Zinc and its salts are highly persistent in water, with half-lives greater than 200 days. Powdered zinc is explosive and may burst into flames if stored in damp places.
Poisonous gas is produced in fire.
This is believed to be an immune response affecting the lungs and body temperature. Very little is known about the long-term effects of breathing zinc dust or fumes. High exposure to zinc dust can cause cough with phlegm. Skin irritation will probably occur in people exposed to some zinc compounds. Metal particles can irritate the eyes.