I can find some information on pollution and ozone from the NC Air Quality page, but nothing really close to Boone.
For the Greensboro-Winston Salem-High Point area, they report recent history for ozone:
GOOD (under 50): 193 days
MODERATE (50-100): 165 days
UNHEALTHY FOR SENSITIVE GROUPS: 7 days
UNHEALTHY: 0 days
VERY UNHEALTHY: 0 days
HAZARDOUS: 0 days
For Hickory-Morganton-Lenoir, the results were:
GOOD (under 50): 196 days
MODERATE (50-100): 70 days
UNHEALTHY FOR SENSITIVE GROUPS: 0 days
UNHEALTHY: 0 days
VERY UNHEALTHY: 0 days
HAZARDOUS: 0 days
For other areas, follow this link:
NCDENR - Division of Air Quality - Data Archives & Statistical Summaries
As one who is sensitive to ozone, I found this information helpful. I hope you do, too.