The purpose of this study is to determine whether exhaled breath temperature, a surrogate
marker of airway inflammation, rises during the pollen season in sensitized subjects with
allergic rhinoconjucnctivitis with or without mild asthma. Sublingual Immunotherapy with
respective allergens suppresses the seasonal increase of EBT. During the second year (2013)
of the trial all patients will be treated with 5 grass allergen extract: carry over
differences between the active and placebo arms from the previous year (2012) will be looked
for.