Alabama is one of four U.S. states where residents have been asked to refill their vehicles with gas in the early morning or evening due to poor air quality reports.

A Code Orange air quality alert has been issued for Friday for Jefferson and Shelby counties for Friday.

Hot temperatures and light winds could combine to raise ozone concentrations to levels that could pose problems for those with respiratory conditions or children.

According to AirNow.gov, a nearby area of high pressure will cause the air to sink across the region, keeping those potentially hazardous pollutants closer to the ground.

High temperatures today are expected to reach well into the 90s in the Birmingham metro area.

As part of the alert, drivers are being asked to refuel vehicles after 6 p.m.

According to Newsweek, Louisiana, and Mississippi have a “no refill before 6 p.m.” advisory in place. In Oklahoma, residents are asked to fill up very early in the morning or after sundown.

Alabama is also one of 15 states with some kind of air quality alert today.