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Allergen are pretty pervasive in the entire Willamette Valley which stretches from Portland down to about Cottage Grove. It's a mild climate with a great growing season so the plants and pollen producers florish. The worst of the allergy season is usually over by the end of June for most of us. Just in time for the field burning. Grass seed field burning and the resulting smoke is worst in Lane, Benton, Linn and Marion counties. Portland usually doesn't have to contend too much with field burning smoke. As for Cottage Grove, it would be farthest south and while I imagine it is out of the worst of the range of the smoke, I'm not sure it would totally escape some effects.
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