Air Quality Alert Issued for Harris, Galveston, Brazoria Counties Through Friday

The National Weather Service has issued an air quality alert for Harris, Galveston, and Brazoria counties, effective through Friday evening, warning residents sensitive to pollution to limit their outdoor activity.

Arden Huels

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Arden Huels

Published 

Sep 26, 2025

Air Quality Alert Issued for Harris, Galveston, Brazoria Counties Through Friday

The National Weather Service issued an air quality alert for Harris, Galveston, and Brazoria counties on Thursday afternoon, advising residents to exercise caution due to high ozone levels expected to persist until Friday.

The NWS Houston/Galveston office sent out a warning at 3:06 p.m. on September 25. It will end at 7:15 p.m. on September 26. The government states that the warning applies to both inland and coastal areas in all three counties, which include Galveston Island.

Ozone is essential in the upper atmosphere because it protects against harmful solar rays. However, when it hits the ground, it becomes a pollutant because sunlight reacts with emissions from industries, cars, and chemicals. High amounts of ozone can irritate the lungs, cause asthma attacks, and exacerbate existing breathing problems.

The NWS advised, "Although the danger to life and property is low, the advisory emphasizes possible health issues for vulnerable populations, such as children, seniors, and people who already have respiratory conditions."

People are further cautioned to limit their active outdoor activities, especially in the afternoon and early evening, when ozone levels are most likely to be high. 

Health officials advise people with asthma or other breathing problems to stay indoors, where the air is cleaner, and limit physical activity outside for extended periods. 

The NWS stated that the alert will expire on its own on Friday evening, unless special conditions require its continuation.

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