Reactive airway disease is a general term for conditions involving wheezing and allergic reactions.
The term sometimes is misused as a synonym for asthma. Current medical use describes an asthma-like syndrome in infants that may later be confirmed to be asthmatics when they become old enough to participate in diagnostic tests such as the bronchial challenge test.
Reactive Airways Dysfunction Syndrome or RADS is a term proposed by Stuart M. Brooks M.D. and colleagues in 1985  to describe an asthma-like syndrome developing after a single exposure to high levels of an irritating vapor, fume, or smoke. It involves coughing, wheezing, and dyspnea.
It can also manifest in adults with exposure to high levels of chlorine, ammonia, acetic acid or sulphur dioxide, creating symptoms like asthma. The severity of these symptoms can be mild to fatal, and can even create long-term airway damage depending on the amount of exposure and the concentration of chlorine. Some experts classify RADS as occupational asthma. Those with exposure to highly irritating substances should receive treatment to mitigate harmful effects.