Top 10 Texas Counties by Ozone Level – June 2025

Here’s a quick look at average ozone levels across the top 10 counties in Texas with the highest overall concentrations. The chart focuses on June 2025, offering a glimpse into seasonal air quality variation

The chart displays the average ground-level ozone concentration recorded in June across the top 10 counties with the highest overall ozone levels. Ozone concentration is measured in parts per million (ppm). Elevated levels, especially above 0.055 ppm, may begin to affect sensitive individuals such as children, the elderly, or people with respiratory conditions. While all values here remain within EPA’s “moderate” range, tracking these patterns over time helps identify regions that may benefit from closer air quality monitoring or policy interventions.