Overview

• The Texas Commission on Environmental Quality declared an Ozone Action Day for Austin on Tuesday, with National Weather Service alerts also in effect for San Antonio, Dallas–Fort Worth, and the Houston–Galveston–Brazoria area.
• Advisories ask residents to curb ozone-producing activities by carpooling, avoiding drive-through lanes, conserving energy, walking or biking, and keeping vehicles tuned.
• The EPA warns that ozone exposure can trigger coughing and breathing difficulty, with elevated risk for children, older adults, people with asthma, and those active outdoors.
• Forecasters say a dominant high-pressure system will keep air stagnant over San Antonio through midweek, with pollution possibly reaching Unhealthy for Sensitive Groups through at least Thursday.
• Separate smoke alerts remain in Washington’s Chelan and Douglas counties with unhealthy PM2.5, while Oregon’s Lane County faces unhealthy air at times through Tuesday evening.