An annual meteorological phenomenon called the Sahara Desert dust cloud has made its way to Texas, bringing hazy skies to the south part of the state and making Texas’ vibrant sunsets even more spectacular.

The bad news is that air quality might worsen. The good news is that locals can expect a week of Technicolor twilights.

According to the National Environmental Satellite, Data, and Information Service, the dust is caused by the 2.5-mile-thick Saharan Air Layer, which is lifted into the atmosphere by storms in the Saharan Desert and transported across the Atlantic Ocean to the U.S.

Saharan dust can wreak havoc on health. The fine particulate matter can trigger symptoms for locals with asthma, allergies, or other respiratory issues. Those sensitive to atmospheric irritation may experience sneezing, coughing, a scratchy throat, or shortness of breath. Some studies have even linked it with an increased risk of cardiovascular mortality.

The National Oceanic and Atmospheric Administration (NOAA) recommends that people with underlying conditions stay enjoy the vibrant red, orange, and yellow skies from indoors.

The vivid dusks and dawns are caused by the sun’s rays scattering the dust particles in the atmosphere. Sunrises and sunsets typically take on warmer hues as low-angle sunlight passes through the atmosphere, but the dust particles enhance the striking effect.

The Sahara dust can also cause some of the hottest days of the year. NOAA says that is because the thick cloud can stifle cooling afternoon thunderstorms.

While the dust has reached southern parts of Texas, it is not guaranteed to hit Dallas-Fort Worth due to a cold front that could stall the dust plume in the south. If it does come to the area, it will be on July 1-2 and is expected to dissipate by the end of the week.