What is the best way to deal with ragweed allergy, hay fever, etc?

Ragweed allergy. Ragweed season is from 15th of august to the first frost in most of the midwest and western U.S. At one time people used to take 'ragweed' vacations and go to calfornia or europe to escape the season and severe symptoms. Antihistamines, decongestant and steroids help. Ideal treatment is evaluation by a trained allergy specialist and immunotherapy (allergy injections) for long term relief.