Cycling has been GREAT for SI joint and sinus problems

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And zoom-zoom, you are not alone. I carry a soft bandanna on rides unless it's really warm (75+) and hikes/walks/runs too, when it's cool. My nose runs like a faucet! But I don't have sinus issues like the OP, just a runny nose when I am outside in cool/cold weather.

I have sinus issues...but my hanky (I actually have about a half-dozen, so there is always a clean one) is useful in the Summer for sweat. I sweat like a horse year-round.