2. Irritant-Induced Asthma (IIA) is occupational asthma without latency: this is an asthma type is when the signs and symptoms of asthma can occur immediately ("without latency") after being exposed to the environmental irritants. e.g. Frank starts a new job working as a janitor where he uses ammonia to clean. After opening the bottle of ammonia and breathing the fumes Frank starts finding it difficult to breath, his chest tightens up and he develops other signs and symptoms of asthma.