Air Quality in Houston: What Residents Should Know

Houston consistently ranks among the most polluted cities in the United States for ground-level ozone and particulate matter. The primary drivers are emissions from the massive petrochemical complex along the Ship Channel, vehicle exhaust from the region's heavy car dependency, and weather patterns that trap pollutants close to the ground on hot, still days. The Texas Commission on Environmental Quality and the Houston-Galveston Area Council monitor air quality at stations across the region and publish daily readings. This guide explains what the Air Quality Index means, how different pollutants affect health, and where to check conditions in your part of the city.