Spring is a season of renewal and rejuvenation in Portland, Oregon, as the city wakes up from the long winter slumber. The cherry blossoms bloom, the daffodils sway in the gentle breeze, and the temperatures start to climb. However, for many residents, springtime also heralds the arrival of allergy season, bringing with it sneezing, itching, and congestion. As the days get longer and the weather gets warmer, the trees in Portland begin to release pollen ...