To assess the efficacy of inhaled AIR645 in the suppression of the Asthmatic Responses in subjects with mild asthma inhaling an allergen.

Inclusion Criteria:

• Men and women with well controlled mild allergic asthma, aged 18 to 65 years
• Only asthma med is short-acting bronchodilator used not more than twice weekly
• FEV1 greater than 70% predicted and a demonstrated baseline late response to allergen induction