League City residents with asthma, heart disease, or young children should limit time outdoors Monday as the region faces its second straight day of elevated ozone pollution.
The Texas Commission on Environmental Quality issued an Ozone Action Day for the Houston, Galveston, and Brazoria area for Monday, Aug. 3, according to an air quality alert relayed by the National Weather Service Houston/Galveston at 3:28 p.m. Sunday. The alert covers League City and all of Galveston County.
Sunday, Aug. 2, was also an Ozone Action Day for the metro area. NWS Houston confirmed on X that Monday marks "another" day of unhealthy air for sensitive groups.
Who's at risk
An Ozone Action Day corresponds to an Air Quality Index in the Orange range (101–150), meaning conditions are unhealthy for sensitive groups. According to AirNow, those most at risk include:
- Children and adults active outdoors
- People with lung disease, including asthma
- People with heart disease
Ground-level ozone can cause decreased lung function, pain with deep breaths, and aggravated asthma symptoms when breathed at high concentrations over several hours, according to TCEQ.
Why it's happening
Hot, sunny days with light winds and low humidity create ideal conditions for ozone to form and accumulate near ground level. The NWS forecast for Monday calls for highs in the mid-90s to near 100°F with sunny skies and light southwesterly winds.
Heat index values are expected to reach 102–107°F through the work week, and rain chances remain low, meaning additional Ozone Action Days are possible later in the week.
What residents can do
NWS Houston advised residents to limit outdoor activities during daytime hours and reduce driving or carpool when possible. The TCEQ alert also recommends steps to reduce ozone formation:
- Walking or biking for short trips
- Packing lunch instead of using drive-through lanes
- Conserving energy at home
- Keeping vehicles properly tuned
Residents can monitor real-time air quality at airnow.gov by searching "Houston, TX" and sign up for TCEQ email and text alerts through the agency's GovDelivery notification page.
No further Ozone Action Day declarations have been issued, but hot, dry conditions are forecast to persist through the work week. The Houston ozone forecast season runs March 1 through Nov. 30, 2026.
