https://www.tceq.texas.gov/airquality/monops/historical-ozone-days
Historical Ozone Action Days - Texas Commission on Environmental Quality - www.tceq.texas.gov
TCEQ maintains records of Ozone Action Days (OAD) that were forecast and the dates for which we issued an OAD alert for each metropolitan area going back to...
ozone action days
https://www.canr.msu.edu/news/what_are_ozone_action_days
What are Ozone Action Days? - MSU Extension
Citizens can help reduce ozone levels by adopting simple steps on Ozone Action Days and every day.
ozone action daysmsuextension