Patients hospitalized in rainy season (72.5%), type of progressively gradual onset (87.8%), smoke trigger (92.4%), viral respiratory infection (88.5%), spray of chemical agents (68.7%), cold weather (57.3%), usual prodrome is rhinitis (76.3%), mean value of SpO2 (on air) (91, 87 ± 4.27%), and it quickly improves after 2 hours of treatment (95.19 ± 2.98%), mean value of PEF (31.95 ± 14.35 L / min) and this value after 2 hours of treatment (41, 51 ± 14.52 L / min).