Quantify nasal congestion?

Had anyone found an inexpensive way to quantify nasal congestion? I find that my sinuses seem to be a great indicator for me of food allergies and general inflammation. I thought it would be cool if there was a simple and hopefully hygenic way to quantify airflow and/or moisture in the nasal passages.

Maybe a small anemometer or hygrometer?

For now I can just use a subjective Likert scale 1…5 for myself