The alert is in effect until 1 p.m.
The department said there are high levels of particulate matter in the air, which can affect people with asthma or other chronic respiratory diseases.
Satellite imagery shows a dust storm in eastern New Mexico and Texas late Tuesday is the source of the dust, city officials said. Winds blew the dust west overnight into the Rio Grande Valley.
The department issued the following recommendations for today:
·Keep windows and doors closed. If needed for comfort, use air conditioners or heating systems on recycle/recirculation mode. Avoid using swamp coolers that can circulate outdoor air inside.
·If symptoms of heart or lung disease occur, (including severe coughing, shortness of breath, chest tightness, chest pain, or unusual fatigue) contact your health care provider.
·Individuals with heart or lung disease should follow their health management plan from their health care provider. Asthmatic individuals should follow a prescribed asthma management plan.
·Avoid outdoor exercise