[Prevalence of asthma at risk symptoms in adolescents exposed to volcanic ash, in two Patagonian cities].

Objective: Evaluate the prevalence of asthma risk in subject of 13-14 years old that were exposed to volcanic ash. One year after the eruption of the Calbuco Volcano and in 2 cities with different degrees of exposure.

Methods: Cross-sectional study was developed in subjects of 13-14 years old of two Patagonian cities: San Carlos de Bariloche and Cipolletti.