Still air combined with wood smoke, industrial emissions, and vehicles are getting the blame for poor air quality in Houston.
Northern Health and the environment ministry have issued an air quality advisory for the region because of high concentrations of fine particulate.
Exposure is a particular concern for infants, the elderly, and those with chronic health conditions like diabetes, heart, or lung disease.
Wood burning appliances are off limits during air advisories unless they are the sole source of heat for a home.
Pollution levels are expected to stay high throughout the day.